JP6232679B2 - Drying processing apparatus and organic waste processing method - Google Patents

Description

  The present invention relates to a drying processing apparatus.

Various methods are known for treating organic waste containing water, such as food waste, sewage sludge, and manure from poultry and pig farms.
For example, in Patent Document 1, a drying process is performed for the purpose of reducing the volume of organic waste containing water such as garbage, food processing residues, and sewage sludge, preventing spoilage, and recycling. .

However, when organic wastes are dried, unnecessary substances such as malodorous substances are generated and discharged during the drying process, and there has been a need for improvement.
Therefore, Patent Document 1 describes using a bag filter to remove fine powder contained in steam exhausted during the drying process.
Patent Document 2 discloses a method of deodorizing malodorous components contained in gas discharged during sludge drying treatment by mixing microorganisms containing enzymes into sludge and the like, fermenting organic sludge, and deodorizing the cooling tower. A method of using cooling water as a deodorizing fluid for scrubbers and a method of decomposing and removing odor components and water-soluble harmful substances by adding microorganisms containing enzymes to the cooling water are described.
Patent Document 3 describes a method of using ozone in order to remove malodorous components contained in the gas discharged during sludge drying.
Patent Document 4 also describes a bag filter, a bag filter filter cloth to which an alkaline agent such as slaked lime is attached, and a catalyst deodorizing device such as platinum.

JP 2006-17335 A JP 2010-236731 A JP 2008-104986 A JP 2009-66563 A

However, in the method described in Patent Document 1, even if fine powder can be removed, removal of malodorous components is not sufficient.
Further, in the method described in Patent Document 2, temperature management for increasing the activity of microorganisms and enzymes is complicated. Moreover, since the drying temperature must be suppressed in order not to kill the microorganisms and inactivate the enzyme, the efficiency of the drying process is reduced. Furthermore, the immediate effect of removing malodorous components is small, and the removal of malodorous components using a cooling tower is not sufficient.
Further, in the method described in Patent Document 3, there is a possibility that residual ozone or harmful substances generated by decomposition by ozone may be mixed in the exhaust gas after treatment, and the cost for taking these measures is high. This is not preferable.
Further, in the method described in Patent Document 4, it is necessary to heat the catalyst deodorization apparatus to about 300 ° C., so that the running cost is increased, and further, the cost of a noble metal catalyst such as platinum is also increased.
Accordingly, an object of the present invention is to provide a drying treatment apparatus capable of sufficiently removing unnecessary substances generated during heat treatment for drying waste, particularly unnecessary substances contained in exhaust gas, at low cost. To do.

In order to solve the above problems, the present invention has the following configuration.
[1] A heating unit that dries organic waste containing moisture and a gas purification unit that purifies gas discharged from the heating unit, and the gas purification unit is configured to supply water to the gas from a plurality of directions. A drying treatment apparatus comprising at least one of spraying means for spraying and adsorption means made of a fired porous ceramic body for purifying the gas.
[2] The drying process according to [1], wherein the gas purification unit includes both the spraying unit and the adsorbing unit, and the adsorbing unit is disposed downstream of the spraying unit in a gas flow. apparatus.
[3] The drying treatment according to [1] or [2], wherein the porous ceramic fired body is obtained by firing the porous ceramic fired body raw material without being dried. apparatus.
[4] The drying treatment apparatus according to any one of [1] to [3], wherein the porous ceramic fired body is a granular material.
[5] The water according to any one of [1] to [4], wherein the water supplied by the spraying means includes at least one selected from the group consisting of an acidic substance, a basic substance, and a surfactant. Drying processing equipment.

  According to the drying treatment apparatus of the present invention, unnecessary substances generated during heat treatment for drying waste, in particular, unnecessary substances contained in exhaust gas can be sufficiently removed at low cost.

It is a schematic diagram which shows an example of the drying processing apparatus of this invention.

Hereinafter, the drying apparatus of the present invention will be described.
The drying treatment apparatus of the present invention includes a heating unit that dries organic waste containing moisture, and a gas purification unit that purifies the gas discharged from the heating unit.

(Organic waste containing water)
Organic waste containing water is discharged from sludge, poultry, hog raising and cattle farms discharged from rural wastewater treatment facilities, sewage treatment plants, organic wastewater treatment facilities such as dyeing plants, food factories and paper mills. Although it is not particularly limited, it may be excrement, waste material discharged from a food processing plant, leftover food from a restaurant, and the like. As the sludge, either undigested sludge or digested sludge can be used.
These organic wastes are preferably those that have been dehydrated by a dehydrator such as a filter press, belt press, and centrifugal dehydration to have a water content of 100% by mass or less.
The water content of organic waste is calculated using the “Test method for metals contained in industrial waste”, promulgation date: February 17, 1973, Environment Agency Notification No. 13, remarks in Table 1 This is done in accordance with the provisions of Specifically, the moisture content of the organic waste is obtained by the following equation (1).
Moisture content (% by mass) of organic waste = (mass before drying (g) −mass in an absolutely dry state (g)) / mass before drying (g) × 100 (1)

(Heating section)
A heating part heats and dries organic waste containing moisture.
In addition, when organic waste is heat-treated by the heating unit, at least one unnecessary substance selected from the group consisting of malodorous substances, harmful substances and dust is often generated.

As a heating part, you may use a well-known dryer, and it is not specifically limited. For example, hot air is blown directly into the drying furnace, steam or oil is used as the heating medium, and the heating medium is passed through the outer periphery of the drying furnace or a plurality of heating tubes arranged in the drying furnace, indirectly. The thing etc. which dry the organic waste containing water are mentioned. Further, an electric heater or the like may be used instead of steam or oil.
The drying method may be either a continuous method or a batch method, but a continuous method is preferred from the viewpoint of the efficiency of the drying process.

As a dryer, what is used for processes, such as sludge, is preferable. For example, the dryer as described in Unexamined-Japanese-Patent No. 2006-17335, Unexamined-Japanese-Patent No. 2012-233599, Unexamined-Japanese-Patent No. 2012-037211, Unexamined-Japanese-Patent No. 2010-236731, 2013-46882 is mentioned.
Moreover, the volatile organic solvent collection | recovery apparatus using the induction heating described in Unexamined-Japanese-Patent No. 2010-75783 can also be used as a heating part. Moreover, it is also possible to use it as a heating part combining induction heating with said dryer.
Commercially available dryers include continuous tube heat transfer dryer inner tube rotary manufactured by Okawara Manufacturing Co., Ltd., rotary dryer with crushing and stirring blades, super rotary dryer, rotary aeration dryer, funnel through, Yamamoto Giken Co., Ltd. Company double drum dryer, rotary coil dryer, etc.

(Gas Purification Department)
The gas purification part in this invention is provided with at least one among the spraying means which sprays water on the said gas from several directions, and the adsorption means made from the porous ceramic sintered body which purifies the said gas.
The gas purification unit may include both the spraying unit and the adsorption unit, or may include only one of the spraying unit and the adsorption unit. In terms of a high gas purification rate, it is preferable to provide both spraying means and adsorption means. Furthermore, it is preferable that the adsorbing means is disposed downstream of the spraying means in the gas flow from the viewpoint of maintaining the removal effect at a high level.
Further, the spraying means and the adsorption means may each be one or plural.

<Spraying means>
By spraying water into the gas using a spraying means, dust contained in unnecessary substances can be captured in water, and water-soluble components of malodorous substances and harmful substances can be dissolved in water. it can.
The spraying means is not particularly limited as long as water can be sprayed, and examples thereof include a spray nozzle and a jet nozzle.
The spray pattern of water supplied from the spraying means is preferably annular, planar or strip-shaped in order to increase the contact area with the gas.
As will be described later, the water sprayed by the spraying means may include at least one selected from the group consisting of acidic substances, basic substances, and surfactants.

The number of spraying means is preferably two or more. If there are two or more spraying means, water can be sprayed from two or more places, and gas can be passed through a space in which water droplets that are disorderly and turbulently fly in various directions exist. Thereby, the contact opportunity of gas and water can be increased, and mainly dust and water-soluble components can be captured more by water.
Furthermore, in order to increase the contact opportunity between gas and water, it is preferable that the spray directions of the two or more spraying means are different from each other.

A part of the water sprayed by the spraying means may be collected and supplied again to the spraying means using a circulation pump.
Alternatively, a certain amount of sprayed water may be stored, and the gas discharged from the heating unit may be bubbled through the stored water to capture unnecessary substances. In this case, the water sprayed from the spraying means is brought into contact with the gas that has passed through the stored water.

<Adsorption means>
Although the arrangement of the adsorption means is not particularly limited, it is preferable to arrange the adsorption means in a direction that is not parallel to the gas traveling direction because the chance of contact with the gas increases. Furthermore, it is more preferable that the adsorbing means is layered and arranged perpendicular to the gas traveling direction. A plurality of layered adsorption means may be arranged. When a plurality of layered adsorption means are arranged, an air layer may be formed between the layers of the adsorption means, or another gas purification unit may be arranged.
Further, the adsorbing means may be filled with a porous ceramic fired body.

[Porous ceramic fired body]
The porous ceramic fired body constituting the adsorbing means has pores in the micrometer order and pores in the nanometer order. Moreover, what has these pores connected is preferable.
More specifically, the pores formed in the porous ceramic fired body have nanometer-order pores having a pore diameter of 1 nm or more and less than 1000 nm and micrometer-order pores having a pore diameter of 1 μm or more and less than 1000 μm. . Moreover, you may have a pore of the millimeter order of 1 mm or more and less than 100 mm other than this range, and a pore of the magnitude | size other than that.

  The pore diameter of the pores can be adjusted by combining the types of raw materials of the fired porous ceramic body and the firing conditions. The pore diameter refers to the major diameter of the pores. The pore diameter of millimeter-order pores is a value measured using a scale after cutting a porous ceramic fired body (cut along the thickness direction in the case of a plate-like material). The pore diameter of nanometer-order pores and micrometer-order pore diameters are measured using an electron microscope after cutting a porous ceramic fired body (cut in the thickness direction in the case of a plate-like material). Value.

  When the porous ceramic fired body has pores in the micrometer order and pores in the nanometer order, it becomes easy to obtain a preferable apparent density and saturated water content described later. For this reason, the contact area with the gas increases, and the performance of removing unnecessary substances becomes higher.

The porous ceramic fired body is preferably obtained by mixing raw materials for a porous ceramic fired body and firing without drying. “Drying” as used herein refers to an operation for setting the moisture content to 1% by mass or less.
By firing without drying, a large amount of moisture contained in the mixture evaporates in a short time during firing, and the porous ceramic fired body is cracked. Due to the cracks at the time of firing, heat is transferred to the inside of the obtained porous ceramic fired body, and pores of the order of micrometers or nanometer size can be formed more. Furthermore, through the cracks in the obtained porous ceramic fired body, water supplied to the porous ceramic fired body, acidic substances contained in the water, and unnecessary substances in the gas enter the porous ceramic fired body. The removal performance can be improved.
The size of the crack in the porous ceramic fired body can be adjusted by the composition of the mixture, the firing speed, the firing time, and the like.
The water content can also be determined by the same method as the water content of organic waste.

The shape of the porous ceramic fired body may be any of a plate-like material, a columnar material, a spherical material, a massive material, and a granular material, but the resistance to gas flow is reduced and the gas and porous ceramics are fired. Granules are preferred because they can easily increase body contact opportunities.
The particle size of the porous ceramic fired body is preferably 5 cm or less, and more preferably 3 cm or less. If the particle size of the porous ceramic sintered body is equal to or less than the above upper limit, the chances of contact with unnecessary substances can be increased.
On the other hand, the particle size of the granular material of the fired porous ceramic body is preferably 1 mm or more, more preferably 5 mm or more because resistance to gas flow is reduced.

The granular material of the fired porous ceramic body may be prepared by preparing granular materials of various sizes and blending them at an arbitrary ratio. The particle diameter is a value measured by sieving. For example, a granular material having a size of more than 5 mm and not more than 10 mm means a particle that passes through a sieve having an opening of 10 mm and cannot pass through a sieve having an opening of 5 mm.
In addition, when the granular material is large and it is difficult to obtain a sieve, the long side of the granular material may be measured with a caliper or the like to obtain the particle diameter.

The porous ceramic fired body preferably has an apparent density of 0.3 to 1.5 g / ml. The upper limit of the apparent density is more preferably 1.1 g / ml or less, and more preferably 0.8 g / ml or less. Within the above range, the pores in the fired porous ceramic body increase while maintaining the strength of the fired porous ceramic body. Therefore, the surface area of the porous ceramic fired body is increased, and the chance of contact with unnecessary substances in the gas can be increased.
The above apparent density is the bulk density (g) determined from the dry soil mass (g) measured by the three-phase distribution / volumetric weight (actual volume method) in “Soil Standard Analysis / Measurement Method” (Hakutosha). Provisional specific gravity, g / ml).
In addition, the unit of the apparent density when the porous ceramic fired body is large is “g / cm ³ ” based on the measurement method described in Examples.

The porous ceramic fired body preferably has a saturated moisture content of 15 to 100% by mass. About the minimum of saturation moisture content, it is more preferable that it is 30 mass% or more. If the saturated moisture content is within the above range, the pores in the porous ceramic fired body increase while maintaining the strength of the porous ceramic fired body. Therefore, the surface area of the porous ceramic fired body is increased, and the chance of contact with unnecessary substances in the gas can be increased.
When the saturated moisture content of the porous ceramic fired body is larger than the above upper limit value, the porosity of the porous ceramic fired body is large, and when the saturated moisture content is smaller than the lower limit value, the porosity is small and the saturated moisture content is small. It can be considered that there is a correlation between the rate and the porosity.

The porous ceramic fired body may carry at least one selected from the group consisting of acidic substances, basic substances, and surfactants.
Specific examples of acidic substances, basic substances, and surfactants include the following.
Examples of the acidic substance include inorganic compounds such as titanium oxide, silicon dioxide, aluminum sulfate, ammonium chloride, and zinc chloride, carboxyl group-containing compounds such as acrylic acid, sulfonic acid group-containing compounds, and organic compounds such as phosphoric acid compounds. It is done.
Examples of basic substances include inorganic compounds such as zinc oxide, magnesium oxide and barium oxide, and organic compounds such as polyamine compounds, dicyandiamide compounds and quaternary ammonium compounds.
In addition, amphoteric substances such as zinc oxide and aluminum oxide become basic substances when the target substance to be treated is an acidic substance, and become acidic substances when the target substance to be treated is a basic substance. Therefore, in the present invention, the amphoteric substance is included in the acidic substance or the basic substance.
Surfactants include anionic surfactants such as carboxylates, sulfates, sulfonates and phosphates, cationic surfactants such as amine salts and quaternary ammonium salts, fatty acid ethylene oxide Examples include polyethylene glycol-type nonionic surfactants such as adducts, polyhydric alcohol-type nonionic surfactants such as fatty acid esters of glycerol, betaine-type, amino acid-type, and imidazoline-type amphoteric surfactants. These surfactants can be used alone or in combination of two or more.
The acidic substance, basic substance, and surfactant preferably have no odor. For example, amphoteric surfactants preferably have a high purity with 10 or more carbon atoms in the alkyl moiety.
A plurality of acidic substances, basic substances, and surfactants may be used in combination, but when an acidic substance and a basic substance are used in combination, a uniform surfactant or the like is used so that they do not bond. It is preferable to maintain a dispersed state.

[Method of producing porous ceramic fired body]
An example of a method for producing a porous ceramic fired body will be described. However, the manufacturing method of a porous ceramic fired body is not limited to the manufacturing method of the following example.
The porous ceramic fired body manufacturing method of this example is prepared by mixing raw materials for a porous ceramic fired body to prepare a mixture (hereinafter, simply referred to as “mixture”) (mixing step), and molding the mixture. Thus, a molded body is produced (molding step), and the molded body is fired to obtain a porous ceramic fired body (firing step).

The mixing step is a step of obtaining a mixture by mixing raw materials including clay.
As a mixture, the thing containing a foaming agent and clay is preferable, for example, and the thing containing a foaming agent, organic sludge, and clay is more preferable. Moreover, you may mix | blend diatomaceous earth. By using a foaming agent and clay, irregularities in the order of millimeters and micrometers can be formed on the surface of large pores in the order of millimeters, pores in the order of micrometers or porous ceramics fired bodies. Furthermore, by using organic sludge, more micrometer-order pores and even smaller nanometer-order pores can be formed. A porous ceramic fired body obtained by firing such a mixture has pores in which the pores communicate with each other. Furthermore, by adding diatomaceous earth, it has pores such as micrometer order derived from diatomaceous earth.

A foaming agent foams at the time of baking, For example, well-known foaming agents for ceramics, such as calcium carbonate, silicon carbide, magnesium carbonate, and slag, can be used. Of these foaming agents, slag is preferred. The slag is not particularly limited. For example, slag is generated at the time of cast iron such as blast furnace slag generated during metal refining, municipal waste melting slag generated when melting municipal waste, sewage sludge melting slag generated when melting sewage sludge, and ductile cast iron. Examples include glassy slag such as cast iron slag. Among them, a stable foamed state is obtained because the composition is stable, and cast iron slag having a foaming rate of about 1.5 to 2 times that of other slags. More preferred.
The cast iron slag contains components such as SiO ₂ , Al ₂ O ₃ , CaO, Fe ₂ O ₃ , FeO, MgO, MnO, K ₂ O, Na ₂ O, and the obtained porous ceramic fired body has a base It has excellent acid substance removability without having to carry a separate substance.

  The amount of slag in the blend can be determined in consideration of the moldability of the mixture, for example, preferably 80% by weight or less, more preferably 20 to 75% by weight, and even more preferably 30 to 65% by weight. . Within the above range, the moldability of the mixture can be smoothly and smoothly formed, and the apparent density and porosity (saturated water content) of the porous ceramic fired body can be adjusted to a suitable range.

Organic sludge is sludge containing an organic substance as a main component. Any organic sludge can be used, and activated sludge derived from wastewater treatment such as sewage or factory is particularly preferable. The activated sludge is discharged from a wastewater treatment facility using the activated sludge method through a coagulation / dehydration process. By using such organic sludge, pores on the order of micrometers can be efficiently formed, and pores on the order of nanometers can be formed. By forming nanometer-order pores, the apparent density of the porous ceramic fired body can be reduced, the porosity (saturated water content) can be further increased, and the chance of contact with unnecessary substances can be increased. Furthermore, activated sludge derived from wastewater treatment, which has been positioned as waste, can be used as a raw material.
The moisture content of the organic sludge is, for example, preferably 5 to 90% by mass, and more preferably 65 to 85% by mass. If it is in the said range, while obtaining a homogeneous mixture, it is easy to maintain favorable moldability.

  Although content of the organic substance in organic sludge is not specifically limited, For example, 70 mass% or more is preferable as content of organic substance (organic substance content) in solid content of organic sludge, and 80 mass% or more is more preferable. The larger the organic content, the easier it is to form micrometer-order pores, and nanometer-order pores. The organic content is a value obtained from the following formula (2) by measuring the ash content (mass%) of the sludge after drying at a carbonization temperature of 700 ° C. according to JIS M8812-1993.

  Organic content (mass%) = 100 (mass%) − ash (mass%) (2)

  The average particle diameter of the organic sludge is preferably 1 to 5 μm, more preferably 1 to 3 μm. Since organic sludge is burned off by firing and pores are formed there, pores on the order of micrometers can be formed more easily as the average particle size is smaller, and pores on the order of nanometers can be formed. The average particle diameter is a volume-based median diameter (50% volume diameter) measured by a particle size distribution measuring device (LA-920, manufactured by Horiba, Ltd.).

  The content of organic sludge in the mixture can be determined in consideration of the moldability of the mixture, for example, preferably 1 to 60% by mass, more preferably 5 to 40% by mass, and 5 to 30% by mass. Further preferred. When the water content of the organic sludge is 65% by mass or more, the mixture has appropriate fluidity and plasticity within the above range, the moldability is improved, and the molding can be smoothly performed without closing the molding apparatus. In addition, in the case of organic sludge having a moisture content of less than 35% by mass, pores on the order of millimeters decrease when the moisture content exceeds 30% by mass.

Clay is a mineral material that exhibits clay-like properties that are commonly used as ceramic raw materials.
As the clay, known materials used for ceramics can be used, which is composed of mineral composition such as quartz, feldspar, clay, etc., and the constituent mineral is mainly kaolinite, halloysite, montmorillonite, illite, bentonite, pyrophyllite. The thing containing is preferable. Examples of such clays include cocoon clay. Clay can be blended alone or in combination of two or more. The components contained in these clays are also effective in removing malodorous and toxic substances contained in the gas.

  The clay content in the mixture can be determined in consideration of the strength and formability required for the porous ceramic fired body. For example, the content is preferably 5 to 60% by mass, more preferably 5 to 50% by mass, and 10 to 40%. More preferred is mass%. If it is in the above-mentioned range, the moldability of the mixture can be smoothly formed without sacrificing, and the strength of the fired porous ceramic body can be made sufficient.

The mixture may contain an optional component as long as the effects of the present invention are not impaired. Examples of optional components include naphthalene-based fluidizing agents such as Mighty 2000WH (trade name, manufactured by Kao Corporation), melamine-based fluidizing agents such as Melment F-10 (trade name, manufactured by Showa Denko KK), and the like. Polycarboxylic acid fluidizers such as Darex Super 100pH (trade name, manufactured by Grace Chemicals Co., Ltd.), antibacterial agents such as silver, copper and zinc, deodorizers such as ammonium chloride and zinc chloride, zeolite, apatite, etc. Adsorbents, carbon fiber having a length of 1 mm to 5 cm, basalt fibers, strength improvers such as rock wool, and metal aluminum.
When blending an optional component in the mixture, the blending amount of the optional component is preferably determined in the range of 0.01 to 10% by mass, for example.

From the viewpoint of moldability, water may be blended as appropriate for the purpose of adjusting the fluidity of the mixture, etc., but when the organic sludge is blended at a suitable blending ratio, It is not necessary to add water.
Moreover, when there is much water | moisture content, it is preferable to contain crushed materials, such as glass and a roof tile, a fly ash, a clinker ash, etc., for example. In particular, by blending crushed tiles, excess moisture can be absorbed, the fluidity of the blend can be adjusted, and the moldability can be improved.
When glass is used, preferably, a high-melting glass particulate filler having a melting temperature of 900 ° C. or higher is more preferable. By using particles of high melting point glass, moisture adjustment is possible while maintaining pores formed in the fired porous ceramic body. High melting point glass and fly ash can also be used as a strength improver.

The particle diameter of the high melting point glass or tile particles is preferably 0.1 to 5 mm. If the particle diameter is less than 0.1 mm, the formation of pores in the porous ceramic fired body may be insufficient. If the pores are not sufficiently formed, the removal performance of unnecessary substances contained in the gas and the durability of the porous ceramic fired body may be deteriorated.
If the particle diameter is more than 5 mm, the moldability may be reduced, or the metal fitting at the extrusion port may be damaged during molding.

  Moreover, clinker ash and fly ash are discharged from a thermal power plant and are preferable from the viewpoint of effective utilization of waste.

  The content of the high melting point glass, tile particles, fly ash and clinker ash in the mixture may be appropriately selected according to the intended fluidity of the composition without departing from the purpose of the present invention. 3-40 mass parts is preferable with respect to a total of 100 mass parts of raw materials other than glass, roof tile, fly ash, and clinker ash, and 10-30 mass parts is more preferable.

The mixing apparatus used for a mixing process is not specifically limited, A well-known mixing apparatus can be used.
Examples of the mixing apparatus include a kneader such as a mix muller (manufactured by Toshin Kogyo Co., Ltd.), a kneader (manufactured by Moriyama Co., Ltd.), a mixer (manufactured by Nippon Ceramics Co., Ltd.), and the like.

The forming step is a step of forming the mixture obtained in the mixing step into an arbitrary shape.
A known molding method can be used as the molding method, and can be determined in consideration of the properties of the mixture and the desired shape of the molded body. As a specific molding method, a molding machine is used to perform extrusion molding to obtain a molded body such as a plate, granule, or columnar shape including pellets, etc., and a mixture is filled into a mold of any shape and molded. Examples thereof include a method of obtaining a body, a method of extruding, stretching or rolling a mixture, and then cutting it into an arbitrary size.
Examples of the molding machine include a vacuum clay molding machine, a flat plate press molding machine, and a flat plate extrusion molding machine. Among these, a vacuum clay molding machine is preferable.

The moisture content of the mixture before firing is preferably more than 1% by mass, more preferably 5% by mass or more, further preferably 10% by mass or more, and particularly preferably 20% by mass or more. . If the water content of the mixture is below the lower limit, it may be difficult for unnecessary substances to enter the porous ceramic fired body obtained.
On the other hand, the moisture content of the mixture before firing is preferably 45% by mass or less, and more preferably 30% by mass or less. If the water content of the mixture exceeds the upper limit, moldability may be impaired.

The firing step is a step of firing the molded body (firing operation) and firing clay and the like to obtain a porous ceramic fired body.
As described above, it is preferable to fire the molded body without drying. A porous ceramic fired body obtained by firing without mixing after mixing raw materials has a higher performance of removing unnecessary substances. Moreover, when not drying, the productivity of a porous ceramic fired body can also be improved.

  In the case of drying the molded body, the molded body may be naturally dried, or may be dried by treating in a hot air drying oven at 50 to 220 ° C. for an arbitrary time. It is good also considering the moisture content of a molded object as 1 mass% or less by drying. In addition, the moisture content of the formed body can be obtained by the same method as the moisture content of the organic waste.

The firing operation is not particularly limited, and a known method can be used. Examples thereof include a method of firing at an arbitrary temperature using a continuous sintering furnace such as a roller hearth kiln or a batch sintering furnace such as a shuttle kiln. Among these, it is preferable to use a continuous sintering furnace for the firing operation from the viewpoint of the efficiency of the drying treatment.
The firing temperature (maximum temperature reached) can be determined according to the properties of the mixture, and is, for example, 850 ° C to 1200 ° C. If it is more than the said lower limit, most organic substances in organic sludge will volatilize and it will reduce weight. If it exceeds the upper limit, vitrification of the entire structure of the porous ceramic fired body proceeds, and the pores may be blocked.
A porous ceramic fired body having pores in the micrometer order and pores in the nanometer order can be obtained by the above manufacturing method.

  When it is desired to form a granular material after the firing step, it may have a crushing step of crushing the porous ceramic fired body into an arbitrary size as necessary. In the crushing process, the porous ceramic fired body obtained in the firing process is crushed and ground with a hammer mill, biaxial rotary crushing, jet mill, ball mill, edge runner mill, etc., to obtain a porous ceramic fired body granule be able to. The obtained granular material is sieved to an arbitrary particle size as necessary.

  Clay or slag used as a raw material when producing a porous ceramic fired body contains a metal oxide or the like, and this metal oxide functions as an acidic component or a basic component in the fired body. The acidic component of the porous ceramic fired body can adsorb a basic substance, and the basic component of the porous ceramic fired body can adsorb an acidic substance.

[Means for supplying water to fired porous ceramics]
In the case where the gas purification unit includes a porous ceramic fired body, it is preferable to further include water supply means for supplying water to the porous ceramic fired body. When water is supplied to the porous ceramic fired body, components in the gas easily come into contact with basic components, acidic components, etc. of the porous ceramic fired body, and it becomes easy to remove unnecessary substances in the gas.
Examples of the water supply means include spray nozzles, jet nozzles, perforated pipes and plate-like objects. The water supply means is preferably disposed above the porous ceramic fired body.
When the gas purification unit includes water supply means, the water that has passed through the porous ceramic fired body may be supplied again to the water supply means using a pump or the like.
As will be described later, the water supplied by the water supply means may include at least one selected from the group consisting of acidic substances, basic substances, and surfactants.

<Other configurations>
In the drying processing apparatus of the present invention, in order to send gas from the heating unit to the gas purification unit, and to send gas in the gas purification unit, it is possible to appropriately install a pipe for discharging processed gas from the gas purification unit. it can.
A suction fan or a blower fan that sends and discharges gas, a demister that captures mist in the gas, a filter that captures dust, a cyclone, and the like may be provided in the middle or at the end of the pipe.
It is preferable to provide a cooling means for cooling the gas sent from the heating unit in the middle or at the end of the pipe for sending the gas from the heating unit to the gas purification unit. By cooling the gas sent from the heating unit, the solubility of water-soluble components in malodorous substances and the like in water increases in the spraying means, and the performance of removing unwanted substances such as malodorous substances is further improved. Examples of the cooling means include a heat exchanger using a cooling medium such as water, and specific examples include a tube type, a plate type, and a regenerative type. In the tube type, a double tube type, a shell and tube type, a spiral type and the like can be mentioned.
Various instruments such as a thermometer and a densitometer may be installed without departing from the object of the present invention.

(Drying method)
The drying processing method using the drying processing apparatus includes a heating process and a gas purification process.

<Heating process>
The heating step is a step of heating and drying organic waste containing moisture.
Although the heating temperature in a heating process can be made into arbitrary temperature, 60 degreeC or more is preferable. If heating temperature is less than the said 60 degreeC, time will be required for volume reduction of sludge etc., and the efficiency of a drying process will fall. The heating temperature is preferably 100 ° C. or higher. If heating temperature is 100 degreeC or more, the organic waste containing a water | moisture content can be dried easily.

Further, the heating temperature in the drying furnace is preferably 400 ° C. or lower, and more preferably 300 ° C. or lower. More preferably, it is less than 200 degreeC. If the heating temperature exceeds the upper limit, there is a risk of ignition if there is a large amount of oxygen in the drying furnace, and organic waste may be carbonized in a reduced state. In addition, when using the method which blows a hot air in a drying furnace in a drying process, 400 degreeC or more may be sufficient as the blowing temperature of the hot air to blow, but 700 degrees C or less is preferable as an upper limit.
Further, the temperature of the heat medium is preferably 100 ° C. or higher when steam, oil, or the like is used as the heat medium and the heat medium is passed through the outer periphery of the drying furnace or a plurality of heating tubes arranged in the drying furnace. Although there is no upper limit in particular, 200 degrees C or less is preferable from viewpoints, such as energy efficiency and safety.
In the heating step, organic waste such as sludge is preferably stirred and dried uniformly.

Since the dried product obtained by the heating process is reduced in volume, it can be easily transported and the transportation cost can be reduced, and the storage space can be reduced and the storage cost can be reduced. In addition, the waste containing water can be prevented from decaying and can be stored easily. In addition, the dried product has a large calorific value and can be used as a fuel. When the organic waste is organic sludge, the dried product can be used as organic sludge which is one of the raw materials of the porous ceramic fired body described above.
The moisture content of the dried product obtained by the heating step is 1 to 30% by mass, more preferably 3 to 15% by mass.
Below the lower limit, there is a risk of excessive energy costs and time for drying. If the value exceeds the upper limit, the effect of reducing the transportation cost and the storage cost may be reduced, or the fuel may contain a lot of moisture and may not be used.
In addition, calculation of the moisture content of a dry matter is measured by the method similar to the moisture content of the organic waste demonstrated previously, and is calculated | required according to said (1) Formula. Specifically, the moisture content of the dried product is obtained by the following equation (3).
Moisture content (% by mass) of dried product = (mass of dried product (g) −mass of dried state (g)) / mass of dried product (g) × 100 (3)

<Gas purification process>
The gas purification step is a step of performing at least one of spraying water onto the gas generated in the heating step by the spraying means and passing the gas generated in the heating process through the porous ceramic fired body of the adsorption means.

[Spraying means]
When water-soluble components are included in the gas generated in the heating process as dust, malodorous substances and harmful substances, the dust can be trapped in water mainly by spraying water on the gas. In addition, water-soluble components among harmful substances can be dissolved in water.
When water is injected into the gas, it is preferable to spray the gas at a high speed from two or more locations. By spraying water in this way, water droplets move randomly and at high speed in various directions, and the chance of contact of water with dust and water-soluble components in the gas can be increased. Therefore, the removal performance of dust and a water-soluble component becomes high.

The water to be sprayed may contain at least one selected from the group consisting of acidic substances, basic substances, and surfactants. When acidic substances, basic substances, and surfactants are added to water, in addition to dust and water-soluble components, water-insoluble and sparingly soluble basic substances, acidic substances, oil-based components, and neutral components Etc. can be removed.
As the acidic substance, the basic substance, and the surfactant, the same substances as those supported on the porous ceramic fired body can be used.

  Moreover, in the range which does not deviate from the objective of this invention, you may add the fragrance | flavor for masking, a chelating agent, an antibacterial agent, a catalyst, etc. to the water to spray. In particular, those that are dried in the heating process, compared to those that are carbonized in the reduced state, have a large amount of gas discharged in the heating process, and there are a variety of components contained in the gas, so there is no odor after the purification process. However, since there may be an unpleasant odor, the use of a fragrance or the like for masking in the gas purification process is effective because it eliminates the aversion from such an odor.

  The temperature during water spraying may be arbitrarily set in consideration of the temperature of the gas to be purified, the solubility of the components contained in the gas, the vapor pressure, and the like.

[Adsorption means]
When the gas generated in the heating process is passed through the porous ceramic fired body, unnecessary substances are physically adsorbed on the surface of the porous ceramic fired body and removed. In addition, the basic component in the gas is mainly ionically adsorbed and removed by the acidic component in the porous ceramic fired body, and the basic component in the porous ceramic fired body is mainly used in the gas. Acidic components are ionized and removed.

When purifying the gas with the porous ceramic fired body, it is preferable to supply water to the porous ceramic fired body because the removal rate of unnecessary substances increases.
Moreover, it is preferable to contain at least one selected from the group consisting of an acidic substance, a basic substance, and a surfactant in the water supplied to the porous ceramic fired body. As the acidic substance, the basic substance, and the surfactant, the same substances as those supported on the porous ceramic fired body can be used.
When the acidic substance or the like is included in the water supplied to the porous ceramic fired body, unnecessary substances can be further removed without supporting the acidic substance or the like on the porous ceramic fired body. If the acidic substance and the like are passed along with water in the porous ceramic fired body having a large surface area, the chance of contact between each component in the gas and the acidic substance increases, and a new acidic component or the like becomes porous ceramic. Since it is supplied into the fired body, it is considered that the removal performance of unnecessary substances is improved.

  In addition to an acidic substance or the like, a masking fragrance, a chelating agent, an antibacterial agent, a catalyst, or the like may be added to the water supplied to the porous ceramic fired body. In particular, those that are dried in the heating process, compared to those that are carbonized in the reduced state, have a large amount of gas discharged in the heating process, and there are a variety of components contained in the gas, so there is no odor after the purification process. However, since there may be an unpleasant odor, the use of a fragrance or the like for masking in the gas purification process is effective because it eliminates the aversion from such an odor.

  When two adsorbing means are provided, one adsorbing means supplies water containing an acidic substance to the porous ceramic fired body to mainly remove basic substances in the gas. Water containing the substance may be supplied to the fired porous ceramic body to remove mainly the acidic substance in the gas.

(Function and effect)
According to the drying treatment apparatus of the present invention, unnecessary substances in the gas generated when the organic waste containing moisture is heated by the heating unit are used as at least one of the adsorbing means such as the spraying means and the porous ceramic fired body. Can be removed by one. By these means, unnecessary substances can be sufficiently removed at low cost. Therefore, introduction is easy even in small and medium-sized factories, waste treatment plants, sewage treatment plants, pig farms and poultry farms, and the odor environment in the region can be improved.
Since the dry matter obtained by drying the organic waste containing water by the drying treatment apparatus of the present invention has been reduced in volume, the cost for transportation and storage can be reduced. Further, the dried product can be used as a beneficial material such as a fuel, a deodorizing agent, and a soil improving material.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated more concretely, this invention is not limited to a following example.

(Manufacture example 1) Manufacture of a porous ceramic fired body 20 mass parts of roof tiles are added to 50 mass parts of slag, 25 mass parts of organic sludge, and 25 mass parts of clay (total 100 mass parts). Using Shinto Kogyo Co., Ltd.) to obtain a plastic mixture (mixing step).
Next, the mixture was extruded into a cylindrical shape having a diameter of 1.5 cm using a vacuum kneader and then cut into a length of 3 cm to obtain a cylindrical shaped body (water content: 15% by mass). The molded body was subsequently fired in a continuous sintering furnace without using a drying step under firing conditions of a firing temperature of 1050 ° C. and a residence time of 7 minutes at the firing temperature (firing step). As the continuous sintering furnace, a roller hearth kiln (effective length of the sintering furnace: total length 15 m, the sintering furnace was divided into zones 1 to 10 each having a length of 1.5 m) was used. The porous ceramic fired body obtained by firing was a mixture of cracked granular materials having a major axis of about 3 cm to 10 cm and a lump.
The obtained porous ceramic fired bodies were pulverized with a hammer mill. Next, using a sieve, it was sieved to a size of more than 5 mm and 10 mm or less to obtain a granular material of a fired porous ceramic body. The resulting porous ceramic fired body was confirmed to have micrometer-order pores and nanometer-order pores. In particular, those having a pore diameter of 1 to 30 μm and 200 to 500 nm were often observed. In addition, the apparent density of the fired porous ceramic body was 0.7 g / ml, the saturated water content was 43% by mass, and communication between pores was also confirmed.

<Raw materials>
In addition, the raw material of the porous ceramic fired body used in the above production example is specifically as follows.

[Slag]
Cast iron slag was used as a foaming agent. The cast iron slag _is a ductile iron slag _{SiO 2, Al 2 O 3,} CaO, Fe 2 O 3, FeO, MgO, MnO, K 2 O, the Na ₂ O as main components.

[Organic sludge]
As the organic sludge, the activated sludge discharged from the wastewater treatment facility by the activated sludge method of the dyeing factory (Komatsu Seiren Co., Ltd.) through the coagulation / dehydration process was used. The activated sludge had an organic content (based on solid content) of 83% by mass and a water content of 85% by mass.

[clay]
As the clay, Sakaime clay (Gifu Prefecture) was used.

[tile]
After being used as a roof tile for a house, the one with a particle diameter of 0.1 mm to 1.2 mm obtained by pulverizing the discarded one was used.

<Measurement and confirmation of physical properties>
The physical property values of the porous ceramic fired body were measured by the following methods.

[Check hole diameter]
Confirmation of the micrometer-order pores and nanometer-order pores of the porous ceramic fired body was observed at 30 to 10,000 times using an electron microscope (SEMEDX Type H type, manufactured by Hitachi Science Systems).

[Apparent density]
When the porous ceramic fired body is a granular material, dry soil mass (g) measured by “three-phase distribution / volumetric weight (actual volume method)” in “Soil Standard Analysis / Measurement Method” (Hakutosha) The bulk density (provisional specific gravity, g / ml) obtained from the above was defined as the apparent density.
Moreover, when the granular material of the porous ceramic fired body was larger than the measurement container, the sample was cut into a rectangular parallelepiped, and the external dimensions of the sample were measured with calipers to determine the volume. The cut sample was made into an absolutely dry state, the mass was measured with an electronic balance (absolutely dry mass), and the apparent density was calculated by the following formula (4).
Apparent density (g / cm ³ ) = absolute dry mass (g) / volume (cm ³ ) (4)

[Saturated water content]
The porous ceramic fired body was immersed in water for 60 minutes, removed from the water, immediately measured for mass (saturated water content mass), and the saturated water content was determined by the following equation (5). The saturation moisture content was measured for the number of samples (N) = 10, and the average value was obtained.
Saturated moisture content (mass%) = {(saturated moisture content mass−absolute dry mass) / absolute dry mass} × 100 (5)

[Check for communication between pores]
Confirmation of the presence or absence of communication between pores in the porous ceramic fired body was confirmed by immersing the obtained porous ceramic fired body in water, sufficiently absorbing water, cutting or crushing, and observing the cross section. When moisture was evenly distributed and retained in the porous ceramic fired body, it was determined that the pores were in communication with each other. When moisture did not spread inside the porous ceramic fired body, it was determined that the individual pores or pores were independent, and the pores were not in communication or inadequate communication.

Example 1
As shown in FIG. 1, the drying treatment apparatus 1 in Example 1 includes a heating unit 60 using a batch dryer, and a first gas purification unit 10 and a second gas purification unit 20 as gas purification units. It was.

  The 1st gas purification part 10 shall have the spray nozzle 12 (spraying means) attached to each of the side surface 11a and the upper surface 11b of the tank 11. FIG. Moreover, in the 1st gas purification | cleaning part 10, the circulation pump 13 which circulates the water collected at the bottom part of the tank 11 and supplies it to the spray nozzle 12 again was provided. In addition, a pipe 40 for introducing gas was connected to the upper part of the tank 11, and a discharge pipe 15 for discharging water accumulated in the lower part of the tank 11 was attached.

The second gas purification unit 20 includes a tank 22a including one porous ceramic fired body layer 21a (adsorption means), a tank 22b including five layers of porous ceramic fired body layers 21b (adsorption means) inside, It was provided with a tank 22c provided with five porous ceramic fired body layers 21c (adsorption means) inside. The tank 22 a was connected to the upper part of the tank 11.
Each of the porous ceramic fired body layers 21a, 21b, and 21c is configured by filling the mesh-like container with the granular material of the porous ceramic fired body obtained in Production Example 1, and is perpendicular to the gas flow. Arranged.
In addition, a spray nozzle 23a that sprays water on the upper surface of the porous ceramic fired body layer 21a is provided inside the tank 22a, and a non-woven fabric demister 24a that captures and removes mist is disposed above the spray nozzle 23a. Was provided.
Inside the tank 22b, there is provided a spray nozzle 23b for spraying water on the upper surface of the uppermost porous ceramic fired body layer 21b. Above the spray nozzle 23b, a non-woven demister that captures and removes mist. 24b was provided. A discharge pipe 25b for discharging the accumulated water was attached to the lower part of the tank 22b.
Inside the tank 22c, there is provided a spray nozzle 23c for spraying water on the upper surface of the uppermost porous ceramic fired body layer 21c. Above the spray nozzle 23c, a non-woven demister that captures and removes mist. 24c was provided. A discharge pipe 25c for discharging the accumulated water was attached to the lower part of the tank 22c.

In addition, the drying processing apparatus 1 includes a pipe 31a and a pump 32a for supplying water accumulated at the bottom of the tank 11 to the spray nozzle 23a, and a pipe for supplying water accumulated at the bottom of the tank 22b to the spray nozzle 23b. 31b and a pump 32b, and a pipe 31c and a pump 32c for supplying water accumulated at the bottom of the tank 22c to the spray nozzle 23c are provided.
Further, a pipe 34a and a pump 35a for supplying the chemical liquid A placed in the chemical liquid tank 33a and the chemical liquid tank 33a to the pipe 31a, and a chemical liquid B contained in the chemical liquid tank 33b and the chemical liquid tank 33b are connected to the pipe 31b. A pipe 34b and a pump 35b for supplying the liquid to the pipe 31c, and a chemical liquid tank 33c and a pipe 34c and a pump 35c for supplying the chemical liquid C contained in the chemical liquid tank 33c to the pipe 31c. This time, chemicals A and B were not put in the chemical tanks 33a and 33b, respectively.
Moreover, the upper part of the tank 22a and the lower part of the tank 22b were connected by the piping 41, the upper part of the tank 22b and the lower part of the tank 22c were connected by the pipe 42, and the piping 43 was attached to the upper part of the tank 22c. A blower fan 44 a is attached to the pipe 41, a blower fan 44 b is attached to the pipe 42, and an exhaust fan 44 c is attached to the pipe 43.
Moreover, the upper part of the heating part 60 and the upper part of the tank 11 were connected by the piping 40. A blower fan 44 d is attached to the pipe 40.

In this example, the organic sludge used as the raw material of the porous ceramic fired body was used as the organic waste, and the heating unit 60 was indirectly heated using the steam as the heat medium (drying furnace temperature 110 ° C.). The moisture content of the dried organic sludge dried in the heating section was 5% by mass, and the volume was reduced. The gas discharged from the heating unit 60 was purified using the first gas purification unit 10 and the second gas purification unit 20.
Specifically, the gas discharged from the heating unit 60 is passed through the pipe 40 and supplied to the tank 11 of the first gas purification unit 10 at a gas supply rate of 3 m ³ / min. Water supplied from the supply pipe 16 was sprayed in a full circle spray pattern using the spray nozzle 12. Thereby, gas can be allowed to pass through the space where water droplets turbulently flying at random and in various directions exist. A part of the water accumulated at the bottom of the tank 11 was sprayed again into the tank 11 from the spray nozzle 12 through the pipe 14 using the circulation pump 13, and the rest was discarded from the discharge pipe 15. Thereby, in the 1st gas purification | cleaning part 10, the dust and water-soluble component which were mainly contained in gas were removed.
In addition, although the chemical | medical solution D put into the inside of the chemical | medical solution tank 17 can also be supplied to the piping 14 with the piping 18 and the pump 19, the chemical | medical solution D was not put into the chemical | medical solution tank 17 this time.

Next, the gas discharged from the upper part of the tank 11 was introduced into the tank 22a and passed through the porous ceramic fired body layer 21a. At that time, a part of the water accumulated at the bottom of the tank 11 and the water supplied from the water supply pipe 36a were sprayed onto the porous ceramic fired body layer 21a using the pipe 31a, the pump 32a and the spray nozzle 23a.
In the tank 22a, unnecessary substances were physically adsorbed on the surface of the porous ceramic fired body and removed. Also, the basic components in the gas are mainly adsorbed and removed by the acidic components contained in the fired porous ceramic fired body, and the acidic components in the gas are mainly adsorbed and removed by the basic components contained in the porous ceramic fired body. did.
The gas that passed through the porous ceramic fired body layer 21a was passed through the demister 24a to capture the mist, and then introduced into the lower portion of the tank 22b through the pipe 41 using the blower fan 44a.

The gas introduced into the tank 22b was passed through the five porous ceramic fired body layers 21b. At that time, using the pipe 31b, the pump 32b, and the spray nozzle 23b, water accumulated in the bottom of the tank 22b and water supplied from the water supply pipe 36b were sprayed onto the porous ceramic fired body layer 21b.
A part of the sprayed water passes through the five layers of the porous ceramic fired body layer 21b and falls and accumulates at the bottom of the tank 22b, and a part of the accumulated water is discharged using the discharge pipe 25b. The
The gas that passed through the porous ceramic fired body layer 21b was passed through the demister 24b to capture the mist, and then introduced into the lower part of the tank 22c through the pipe 42 using the blower fan 44b.

The gas introduced into the tank 22c was passed through the five porous ceramic fired body layers 21c. At that time, using the pipe 31c, the pipe 34c, the pump 32c, the pump 35c, and the spray nozzle 23c, water accumulated in the bottom of the tank 22c (the chemical C is applied to the porous ceramic fired body layer) Sprayed and dropped and accumulated) and the chemical C placed in the chemical tank 33c was sprayed. In addition, the chemical | medical solution C put into the chemical | medical solution tank 33c was supplied to the piping 31c using the piping 34c and the pump 35c. The tank 22c has a main role of removing basic substances. As the chemical solution C, the acidic substances zinc chloride and ammonium chloride (zinc chloride: ammonium chloride 30: 1 (mass ratio)) are used, and the concentration of the acidic substance (total amount of zinc chloride and ammonium chloride) in the chemical solution C is The acidic substance was added to water so that it might become 2 mass%.
Part of the sprayed water and chemical C passes through the five porous ceramic fired body layers 21c and falls to the bottom of the tank 22c and accumulates, and part of the accumulated water and chemical C is a discharge pipe. 25c is discharged. Then, the water accumulated at the bottom of the tank 22c and the medicine B supplied from the chemical liquid tank 33c are sprayed and supplied from the spray nozzle 23c to the porous ceramic fired body tank 21c.
The gas that passed through the porous ceramic fired body layer 21c was passed through the demister 24c to capture the mist, and was then discharged to the outside of the tank 22c through the pipe 43 using the exhaust fan 44c.

Regarding the deodorizing performance of malodorous substances contained in the gas in Example 1, the gas was sampled from the piping 40 and the piping 43, and ammonia, acetic acid, methyl mercaptan, hydrogen sulfide, amines, and acetaldehyde were respectively detected as gas detector tubes (stocks). Company Gastec, ammonia: No. 3L and No. 3M, acetic acid: No. 81, methyl mercaptan: No. 70L, hydrogen sulfide: No. 4LB, amines: No. 180L and 180, acetaldehyde: 92 and 92L. Evaluation was carried out by measuring the concentration (ppm) using each number of suctions once (100 ml).
Moreover, the sensory test which an evaluator sniffs the smell of each sample was also implemented.
The water content of the organic sludge dried in the heating unit was 5% by mass, and the volume was reduced.

(Example 2)
As organic waste, Example 1 except that 0.3 part by mass of a deodorant (zinc chloride: ammonium chloride = 30: 1 (mass ratio)) was added to 100 parts by mass of organic sludge used in Example 1. The waste was treated in the same way.
The water content of the organic sludge dried in the heating section was 5% by mass, and the volume was reduced.
Moreover, it evaluated similarly to Example 1 about the deodorizing performance of the malodorous substance etc. which are contained in gas.

  The evaluation results of Examples 1 and 2 are shown in Table 1.

(*) The concentration of the amines of Example 1 was overscaled even when measured with 1/2 (50 ml) suction, but was estimated to be approximately 240 ppm.

As shown in Table 1, in the evaluation by the gas detection tube, the use of the drying treatment apparatus 1 sufficiently removes malodorous substances contained in the gas discharged from the heating section in both Example 1 and Example 2. It was.
On the other hand, in the sensory test, the odor was weakened but still remained. Therefore, in Example 1 and Example 2, when 2% by mass of the fragrance was added to the chemical tank 33c, the odor felt in the sensory test was not felt at all, and a good fragrance of the fragrance was felt. In particular, in Example 2 in which a deodorant was added to organic sludge, a remarkably high deodorizing effect was confirmed.

(Example 3)
Waste was treated in the same manner as in Example 1 except that a heat exchanger was installed as a cooling means for the gas sent from the heating unit 60 on the upstream side of the blower fan 44d in the pipe 40. As the heat exchanger, a shell and tube type using water as a cooling medium was used.
In order to evaluate the difference in deodorizing performance of malodorous substances before and after installing the heat exchanger, a gas detector tube was used in the same manner as in Example 1 for ammonia, hydrogen sulfide, amines, and acetaldehyde contained in the gas in the tank 11. Used to measure the concentration (ppm).
The evaluation results of Example 3 are shown in Table 2. In addition, the density | concentration of the piping 40 in Table 2 is the same as the data of the piping 40 of Example 1 of Table 1.

  As a result, it was confirmed that the performance of removing malodorous substances in the tank 11 was further improved by installing the heat exchanger.

DESCRIPTION OF SYMBOLS 1 Drying processing apparatus 10 1st gas purification part 11 Tank 12 Spray nozzle 13 Pump 14 Piping 15 Discharge pipe 16 Water supply pipe 17 Chemical liquid tank 18 Piping 19 Pump 20 2nd gas purification part 21a, 21b, 21c Porous ceramic sintered body layer 22a, 22b, 22c Tank 23a, 23b, 23c Spray nozzle 24a, 24b, 24c Demister 25b, 25c Discharge pipe 31a, 31b, 31c Piping 32a, 32b, 32c Pump 33a, 33b, 33c Chemical liquid tank 34a, 34b, 34c Piping 35a , 35b, 35c Pump 40, 41, 42, 43 Piping 44a, 44b, 44d Blower fan 44c Exhaust fan 60 Heating section

Claims (9)

A heating unit that heats organic waste containing moisture, and one or more gas purification units that purify the gas discharged from the heating unit,
The gas purification unit includes at least one of spraying means for spraying water from a plurality of directions to the gas, and adsorption means made of a porous ceramic fired body for purifying the gas,
At least one gas purification unit is not provided with an adsorption means made of a porous ceramic fired body, and is provided with a spray means for spraying water containing a surfactant,
Gas purification unit provided with the suction means on the downstream side of the gas purification unit with the spray means that are arranged at, at least one stream of gas, drying apparatus.   The drying processing apparatus according to claim 1, wherein the porous ceramic fired body is a granular material. The water supplied by the spraying means, acidic substances, including at least one selected from the group consisting of basic material, drying apparatus according to any one of claims 1-2. The gas purification unit comprises a suction means comprises a water supply means for supplying water to said porous ceramic sintered body, the drying processing apparatus according to any one of claims 1-3. It said porous ceramic sintered body to trap mist in the gas passing through the demister is provided, the drying processing apparatus according to any one of claims 1-4. The drying processing apparatus according to any one of claims 1 to 5 , wherein a cooling unit using a heat exchanger that cools a gas from the heating unit is provided between the heating unit and the first gas purification unit. The processing method of the organic waste using the drying processing apparatus as described in any one of Claims 1-6 . The organic waste processing method according to claim 7 , wherein the organic waste is heated by adding a deodorant. The method for treating organic waste according to claim 7 or 8 , wherein the porous ceramic fired body is obtained by mixing the raw materials for the porous ceramic fired body and then firing without drying. .

Images