KR102710674B1 - multistage deodorization apparatus for removing complex odor - Google Patents

Abstract

The present invention relates to a multi-stage deodorizing device for removing a complex odor, and more specifically, to a multi-stage deodorizing device capable of effectively removing a complex odor with a single device by pretreating a complex odor containing a mixture of acidic, neutral, and basic odor components with a photocatalyst and ozone to reduce the odor load, then removing high-concentration hydrogen sulfide using a liquid catalyst, and then removing acidic, neutral, and basic odors in stages.

Description

{multistage deodorization apparatus for removing complex odor}

The present invention relates to a multi-stage deodorizing device for removing a complex odor, and more specifically, to a multi-stage deodorizing device capable of effectively removing a complex odor with a single device by pretreating a complex odor containing a mixture of acidic, neutral, and basic odor components with a photocatalyst and ozone to reduce the odor load, then removing high-concentration hydrogen sulfide using a liquid catalyst, and then removing acidic, neutral, and basic odors in stages.

Generally speaking, bad smell refers to a smell that irritates the nose of people and causes mental and physical harm. These bad smell-causing substances are very diverse depending on the source, and sewage treatment plants, incinerators, food waste treatment facilities, feed drying facilities, landfills, oil refineries, chemical plants, and sewage and livestock wastewater treatment plants are considered as the main sources of bad smell in cities.

The foul odors from odor-generating facilities are caused by decaying substances or various volatile organic compounds, so they not only cause discomfort but are also harmful to the human body and cause many problems, including decreased efficiency due to decreased concentration and increased safety accidents.

These odor-causing substances, such as ammonia, methyl mercaptan, hydrogen sulfide, methyl sulfide, methyl disulfide, trimethylamine, acetaldehyde, and styrene, are regulated by law.

Malodorous substances can be classified into basic, acidic, and neutral types according to pH. For example, ammonia and trimethylamine belong to the basic type, hydrogen sulfide, methyl mercaptan, propionic acid, normal butyric acid, isovaleric acid, etc. belong to the acid type, and methyl sulfide, methyl disulfide, acetaldehyde, etc. belong to the neutral type.

Conventional methods for removing these odorous substances are largely classified into physical, chemical, and biological treatment methods, and the methods currently mainly used include combustion, cleaning, oxidation, adsorption, and microbial treatment.

Among these, combustion methods are effective in removing almost all combustible odorous substances, but they are expensive to maintain due to fuel costs or catalyst replacement, and if operation management is neglected, nitrogen oxides are generated and there is a risk of explosion.

In addition, the oxidation method is a method that removes odor components by oxidizing them using the strong oxidation action of ozone, and is relatively efficient in removing large amounts of gas as it consumes little power and is easy to maintain. However, ozone alone has the disadvantage of a narrow range of application and insufficient performance.

The adsorption method is a method of removing odors using activated carbon. However, if various odorous substances accumulate in the pores of the activated carbon and are absorbed to a saturated state, the deodorizing effect is lost, and if odors begin to leak out, the adsorption carbon must be replaced with new carbon. In addition, if the concentration of the substance to be removed is high, pretreatment stages such as washing, absorption, cooling, and condensation must be performed in parallel to reduce the concentration before activated carbon adsorption can be performed.

And the microbial treatment method is a method that uses microorganisms to decompose the malodorous substances absorbed when the malodor passes through wood chips or soil. If the growth conditions of the microorganisms are properly created, the odor removal ability is excellent and secondary pollutants are not generated, but it takes up a lot of land area and takes a lot of time.

Korean Patent No. 10-1454794 discloses a deodorizing device that improves the contact efficiency between a chemical solution and an odorous gas.

The above deodorizing device is a cleaning method that deodorizes by washing the foul-smelling gas with water, acid, or alkaline solution. This method has the advantage of being relatively simple in equipment and low in operating costs.

However, there is a problem that the scope of application of odorous substances is narrow and it is difficult to treat high-concentration complex odors. Therefore, there is a problem that it is difficult to fundamentally treat odors because only specific gases of different properties are treated with a single facility for odors of various properties such as acidic, alkaline, and neutral. In addition, there is a limit to removing hydrogen sulfide, the most representative odor substance, with only a chemical solution.

Korean Patent No. 10-1454794: Deodorizing device that improves the contact efficiency between the liquid and the odorous gas

The present invention was created to improve the above problems, and the purpose of the present invention is to provide a multi-stage deodorizing device capable of effectively removing a complex odor with a single device by pretreating a complex odor containing a mixture of acidic, neutral, and basic odor components with a photocatalyst and ozone to reduce the odor load, then removing high-concentration hydrogen sulfide using a liquid catalyst, and then removing acidic, neutral, and basic odors in stages.

In order to achieve the above object, the multi-stage deodorizing device for removing a complex malodor of the present invention comprises: a first pretreatment unit for first oxidizing a gas containing a malodorous substance with a photocatalyst; a second pretreatment unit for second oxidizing the gas passing through the first pretreatment unit by contacting it with ozone; a liquid catalyst treatment unit for removing hydrogen sulfide in the gas by contacting the gas passing through the second pretreatment unit with a liquid catalyst; a complex malodor treatment unit for sequentially contacting the gas passing through the liquid catalyst treatment unit with three different chemical solutions to remove acidic, neutral and basic malodorous substances in the gas; and a water washing unit for removing malodorous substances remaining in the gas by contacting the gas passing through the complex malodor treatment unit with water.

The above photocatalyst includes a visible light responsive photocatalyst.

The above first pretreatment unit comprises a reaction tower into which the gas is introduced, photocatalyst modules installed at regular intervals inside the reaction tower, and lamps installed between the photocatalyst modules.

The above liquid catalyst treatment unit comprises a first cleaning tower into which gas passing through the second pre-treatment unit flows downward and is discharged upward, and a liquid catalyst supply means for spraying liquid catalyst into the interior of the first cleaning tower, and the liquid catalyst supply means comprises a liquid catalyst storage tank installed at the lower portion of the first cleaning tower and connected to the interior of the first cleaning tower, in which liquid catalyst is stored, a liquid catalyst supply pipe through which liquid catalyst is moved by a circulation pump installed in the liquid catalyst storage tank, a liquid catalyst injection nozzle connected to the liquid catalyst supply pipe and installed inside the first cleaning tower and spraying liquid catalyst supplied through the liquid catalyst supply pipe, a liquid catalyst supplement tank for replenishing liquid catalyst to the liquid catalyst storage tank, an aeration means for aerating air inside the liquid catalyst storage tank, and the A filter is provided to remove sulfur particles from the liquid catalyst stored in the liquid catalyst storage tank.

The above-mentioned composite odor treatment unit comprises a second cleaning tower into which gas passing through the liquid catalyst treatment unit flows downward and is discharged upward, a plurality of partition walls installed vertically inside the second cleaning tower to partition the interior of the second cleaning tower into a plurality of cleaning spaces, a first chemical supply unit for spraying a first chemical solution into one of the cleaning spaces to remove alkaline odor substances in the gas, a second chemical supply unit for spraying a second chemical solution into one of the remaining cleaning spaces excluding a cleaning space into which the first chemical solution is sprayed to remove neutral odor substances in the gas, and a third chemical supply unit for spraying a third chemical solution into the remaining cleaning spaces excluding a cleaning space into which the first chemical solution is sprayed and a cleaning space into which the second chemical solution is sprayed to remove acidic odor substances in the gas.

The second pretreatment unit comprises a contact chamber through which gas discharged from the first pretreatment unit passes, an ozone injection unit installed inside the contact chamber, an ozone supply unit for injecting ozone into the ozone injection unit, and a driving means for rotating the ozone injection unit, wherein the ozone injection unit comprises an ozone inlet pipe connected to the ozone supply unit and extending from the outside to the inside of the contact chamber and rotatably supported by the contact chamber, a drum coupled to the lower portion of the ozone inlet pipe and having a plurality of first side holes formed at regular intervals on the side, an elastic sheet coupled to the inner surface of the drum and capable of expanding and contracting, a cutting line formed on the elastic sheet and located inside the first side holes, a contact frame installed inside the drum and contacting the elastic sheet with the inner surface of the drum and having second side holes formed to correspond to the first side holes, and a contact frame formed on the lower portion of the drum and having the contact chamber It has a rotary shaft that extends externally and can be rotated by the driving means.

As described above, the present invention pretreats a complex malodor containing a mixture of acidic, neutral, and basic malodor components by oxidizing and decomposing it using a photocatalyst and ozone in the first pretreatment unit and the second pretreatment unit, thereby reducing the malodor load and increasing the malodor removal efficiency even when a high concentration of malodor is introduced.

In addition, the present invention can effectively remove high concentrations of hydrogen sulfide by using a liquid catalyst.

In addition, the present invention can remove a complex malodor composed of various malodorous substances, such as acidic, neutral, and basic malodorous substances, with a single device by bringing different types of chemicals into contact with the malodorous substances in stages.

Therefore, the present invention can be effectively utilized in the removal of complex odors containing a mixture of acidic, neutral, and alkaline odor components discharged from wastewater treatment plants, livestock manure treatment facilities, sewage and livestock wastewater treatment plants, biomass utilization facilities, sludge drying facilities, food waste treatment facilities, acupuncture treatment plants, livestock facilities, etc.

Figure 1 is a configuration diagram of a multi-stage deodorizing device according to one embodiment of the present invention.
Figure 2 is a cross-sectional view of an excerpt of the main part of Figure 1.
Figure 3 is a cutaway perspective view of the photocatalytic module applied to Figure 2.
Figure 4 is a cross-sectional view of a main part of a multi-stage deodorizing device according to another example of the present invention.
Figure 5 is a cross-sectional view of a main part for showing the operation of Figure 4.

Hereinafter, a multi-stage deodorizing device for removing complex odors according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

Referring to FIGS. 1 to 3, the multi-stage deodorizing device for removing a complex malodor according to the present invention comprises a first pretreatment unit that first oxidizes gas containing a malodorous substance using a photocatalyst, a second pretreatment unit that secondarily oxidizes gas passing through the first pretreatment unit by contacting it with ozone, a liquid catalyst treatment unit that removes hydrogen sulfide in the gas by contacting the gas passing through the second pretreatment unit with a liquid catalyst, a complex malodor treatment unit that sequentially contacts the gas passing through the liquid catalyst treatment unit with three different types of chemical solutions to remove acidic, neutral and basic malodorous substances in the gas, and a water washing unit that removes malodorous substances remaining in the gas by contacting the gas passing through the complex malodor treatment unit with water.

Gas containing odorous substances flows into the first pretreatment unit.

Gas containing odorous substances is generated from odor sources. The odor sources that cause these odorous substances are very diverse, and major odor-generating facilities include sewage treatment plants, livestock manure treatment facilities, manure and livestock wastewater treatment plants, biomass utilization facilities, sludge drying facilities, food waste treatment facilities, leachate treatment plants, and livestock facilities.

The first pretreatment unit is equipped with a reaction tower (200) connected to a gas inlet pipe (1) into which gas containing an odorous substance is introduced, photocatalyst modules (210) installed at regular intervals inside the reaction tower (200), and lamps (215) installed between the photocatalyst modules (210).

The reaction tower (200) is connected to the source of odor through a gas inlet pipe (1). Gas containing odorous substances flows into the lower part of the reaction tower (200) through the gas inlet pipe (1). A filter-type dust collector (3) that removes dust in the gas may be installed in the gas inlet pipe (1).

The reactor (200) has an inlet installed at the bottom and an outlet installed at the top. A demister (217) for removing moisture in the gas may be installed inside the reactor. The demister (14) is installed at the bottom inside the reactor (200).

A plurality of photocatalyst modules (210) are installed inside the reaction tower (200). The photocatalyst modules (210) are installed side by side and spaced apart from each other vertically.

The photocatalytic module (210) comprises a square-shaped support frame (211), a pair of meshes (213) installed on the inside of the support frame (211), ceramic balls (214) accommodated between the pair of meshes (213), and a photocatalytic coating layer formed by coating the surfaces of the meshes (213) and the ceramic balls (214).

The photocatalytic coating layer is a material that is activated by light and has a strong redox ability. Materials that can be used as photocatalysts include ZnO, CdS, WO ₃ , and TiO ₂ . Preferably, in order to enhance the oxidation and decomposition effect of odor by photocatalysis, it is preferable to use a visible light-responsive photocatalyst that can be photoactivated even under visible light.

The visible light-responsive photocatalyst can utilize various known photocatalysts. For example, the photocatalyst (BTO/WO ₃ ) disclosed in Korean Patent No. 10-2257999 can be utilized as the visible light-responsive photocatalyst. Unlike TiO ₂ photocatalysts, visible light-responsive photocatalysts such as BTO/WO ₃ react in the visible light and infrared ranges, thereby greatly improving the photocatalytic efficiency, thereby expanding the treatment range of contaminants, etc. In addition, regardless of the surface curvature, titanium dioxide can be easily surface-adsorbed on antibacterial objects such as filters due to its amorphous nature.

The lamp (215) generates light to photoactivate the photocatalyst. The lamp (215) is installed between the photocatalyst modules (210). An ultraviolet lamp that generates ultraviolet light can be used as the lamp (215). In addition, when a visible light-responsive photocatalyst is used, it goes without saying that a lamp that generates visible light can be used.

The gas that has been first oxidized by the photocatalyst while passing through the reaction tower (200) is discharged to the second pretreatment section through the upper part of the reaction tower (200). The discharge port of the reaction tower (200) and the second pretreatment section are connected to the first gas discharge pipe (4).

The second pretreatment section performs secondary oxidation treatment by contacting the gas that has passed through the first pretreatment section with ozone. Ozone in a gaseous state or ozone water in a liquid state can be used.

The second pretreatment unit is equipped with a contact chamber (9) through which gas discharged from the first pretreatment unit passes, and an ozone supply unit for injecting ozone into the interior of the contact chamber (9).

The contact chamber (9) is formed into a square tube structure. One side of the contact chamber (9) is connected to the first gas discharge pipe (4). Gas flows into the contact chamber (9) through the first gas discharge pipe (4). And the other side of the contact chamber (9) is connected to the second gas discharge pipe (7). The gas passing through the contact chamber (9) is discharged through the second gas discharge pipe (7) and flows into the liquid catalyst treatment unit.

The ozone supply unit is equipped with an ozone generator (not shown) and an ozone supply pipe (5) for injecting ozone generated from the ozone generator into the interior of the contact chamber (9).

Ozone introduced into the contact chamber (9) comes into contact with gas passing through the contact chamber (9) and plays a role in secondarily oxidizing and decomposing odorous substances in the gas. In the case of gas containing a high concentration of odorous substances, pretreatment of the odorous substances by ozone is useful.

The liquid catalyst treatment unit removes hydrogen sulfide in the gas by bringing the gas that has passed through the second pretreatment unit into contact with a liquid catalyst.

The liquid catalyst treatment unit first removes hydrogen sulfide in the gas by bringing the gas that has passed through the second pretreatment unit into contact with a liquid catalyst. Hydrogen sulfide, which contributes the most to the emission concentration of complex odors among odorous gases, can be removed by more than 99% using the liquid catalyst.

For example, the liquid catalyst treatment unit is equipped with a first cleaning tower (10) into which gas passing through the second pretreatment unit flows in through the bottom and is discharged through the top, and a liquid catalyst supply means for spraying liquid catalyst into the interior of the first cleaning tower (10).

The first cleaning tower (10) has an inlet (11) formed at the bottom through which gas flows in, and an outlet (13) formed at the top through which gas flows out. A gas inlet pipe (1) is connected to the inlet (11). Gas containing odorous substances flows into the first cleaning tower (10) through the gas inlet pipe (1). The gas flowing into the first cleaning tower (10) moves upward from the inside of the first cleaning tower and is discharged to the outside through the outlet (13). A third gas discharge pipe (15) is installed in the outlet (13).

At least one packing layer (12) is installed inside the first cleaning tower (10). The packing layer is a structure filled with a packing material having a large porosity and a large specific surface area, and a pall ring, a rasing ring, etc. are used as the packing material. In addition, a demister (14) for removing moisture in the gas may be installed inside the first cleaning tower (10). The demister (14) is installed at the upper part of the inside of the first cleaning tower (10).

The liquid catalyst supply means is installed at the bottom of the first cleaning tower (10) and connected to the interior of the first cleaning tower (10), and includes a liquid catalyst storage tank (17) in which the liquid catalyst is stored, a liquid catalyst supply pipe (21) through which the liquid catalyst moves by a circulation pump (19) installed in the liquid catalyst storage tank (17), a liquid catalyst injection nozzle (23) connected to the liquid catalyst supply pipe (21) and installed inside the first cleaning tower (10) and spraying the liquid catalyst supplied through the liquid catalyst supply pipe (21), a liquid catalyst supplement tank (20) for replenishing the liquid catalyst to the liquid catalyst storage tank (17), an aeration means for aerating air in the interior of the liquid catalyst storage tank (20), and a device for removing sulfur particles in the liquid catalyst stored in the liquid catalyst storage tank (20). A filter (25) is provided.

The liquid phase oxidation process, which causes gas to come into contact with a liquid catalyst and react in the liquid phase, removes hydrogen sulfide by utilizing the solubility of the gas and the redox reaction of the catalyst, and the used liquid catalyst is regenerated and recycled, so no wastewater is generated. Since hydrogen sulfide dissolved in the liquid catalyst is separated into solid sulfur by oxygen, a metal catalyst is usually used to promote the oxidation reaction, and the metal ions used must have affinity and a redox mechanism. Iron ions can be examples of such metal ions. The metal ions oxidize sulfur ions in an aqueous solution, are reduced themselves, and then are oxidized again by oxygen, performing a catalytic action through a redox reaction.

In particular, iron chelate using iron ion as a liquid catalyst is a method that can be operated at room temperature and pressure by utilizing the solubility of sulfide gas in water and the redox principle of iron chelate compounds. As a chelating agent that forms a complex with iron and performs a sulfide removal reaction, NTA (nitrilotriacetic acid) and EDTA (ethylenediaminetetraacetic acid) can be used. Examples of liquid catalysts using such chelating agents include Fe-EDTA and Fe-NTA.

The liquid catalyst storage tank (17) is connected to the lower part of the first cleaning tower (10) so that the liquid catalyst sprayed into the inside of the first cleaning tower can flow back into the liquid catalyst storage tank (17).

The liquid catalyst stored in the liquid catalyst storage tank (17) is supplied to the liquid catalyst injection nozzle (23) through the liquid catalyst supply pipe (21) by the circulation pump (19).

The liquid catalyst injection nozzle (23) is installed inside the first cleaning tower (10). The liquid catalyst injection nozzle (23) may be installed one at a time or two or more at regular intervals inside the first cleaning tower (10). The liquid catalyst injected through the liquid catalyst injection nozzle (23) comes into contact with the gas introduced into the first cleaning tower (10).

The liquid catalyst supplement tank (20) supplements the liquid catalyst to the liquid catalyst storage tank (17). The liquid catalyst supplement tank (20) and the liquid catalyst storage tank (17) are connected to the liquid catalyst supplement pipe (21). A supplement pump (23) is installed in the liquid catalyst supplement pipe (21).

When the level of the liquid catalyst stored in the liquid catalyst storage tank (17) falls below the set level or the pH of the liquid catalyst goes out of the set pH range, the supplementary pump (23) is operated to supply a certain amount of the liquid catalyst stored in the liquid catalyst supplementary tank (20) to the liquid catalyst storage tank (17). For this purpose, a level sensor (18a) and a pH sensor (18b) are installed in the liquid catalyst storage tank (17).

The aeration means consists of a blower (27) and an air diffuser (29) connected to the blower (27) and installed inside the liquid catalyst storage tank (17). This aeration means is intended to oxidize and regenerate the liquid catalyst.

A filter press can be used as a filter (25). A portion of the liquid catalyst stored in the liquid catalyst storage tank (17) is introduced into the filter (25) to remove sulfur particles in the liquid catalyst, and then the liquid catalyst is circulated back to the liquid catalyst storage tank. The filter (25) is connected to the liquid catalyst storage tank (17) by a circulation pipe (26).

As described above, the present invention can enhance the odor reduction effect by first removing hydrogen sulfide contained in gas using a liquid catalyst.

The composite odor treatment unit sequentially contacts the gas that has passed through the liquid catalyst treatment unit with three different types of chemicals to remove acidic, neutral, and basic odor substances in the gas.

The composite odor treatment unit comprises, for example, a second cleaning tower (30) in which gas passing through a liquid catalyst treatment unit flows in from the bottom and is discharged from the top, a plurality of partition walls (42)(44) installed vertically spaced apart from each other inside the second cleaning tower (30) to divide the inside of the second cleaning tower (30) into a plurality of cleaning spaces (41)(43)(45), a first chemical supply unit for spraying a first chemical solution into one of the cleaning spaces (41)(43)(45) to remove basic odor substances in the gas, a second chemical supply unit for spraying a second chemical solution into one of the remaining cleaning spaces excluding the cleaning space where the first chemical solution is sprayed to remove neutral odor substances in the gas, and a third chemical solution for spraying the remaining cleaning spaces excluding the cleaning space where the first chemical solution is sprayed and the cleaning space where the second chemical solution is sprayed to remove acidic odor substances in the gas. It is equipped with a 3-liquid supply section and a fluid movement section installed on a bulkhead that allows gas to move upward but blocks liquid from moving downward.

The second cleaning tower (30) has an inlet (31) formed at the bottom through which gas flows in, and an outlet (33) formed at the top through which gas flows out. A third gas discharge pipe (15) is connected to the inlet (31). Gas containing odorous substances flows into the second cleaning tower (30) through the third gas discharge pipe (15). The gas flowing into the second cleaning tower (30) moves upward from the inside of the second cleaning tower (30) and is discharged to the outside through the outlet (33). A fourth gas discharge pipe (35) is connected to the outlet (33).

A plurality of baffles (42)(44) are installed inside the second cleaning tower (30). In the present invention, the types of chemicals sprayed into each cleaning space (41), (43) and (45) may be different from each other. Therefore, in order to prevent different chemicals from being mixed inside the second cleaning tower (30), the present invention has a configuration in which the inside of the second cleaning tower (30) is divided into a plurality of cleaning spaces by installing baffles (42)(44) inside the second cleaning tower (30).

The bulkheads (42)(44) are installed in multiple numbers so as to be spaced apart in the vertical direction inside the second cleaning tower (30). In the illustrated example, two bulkheads (42)(44) are installed inside the second cleaning tower (30) to form three cleaning spaces (41)(43)(45). For convenience of explanation, the cleaning space located at the top of the three cleaning spaces (41)(43)(45) is referred to as the upper cleaning space (41), the cleaning space located in the middle is referred to as the middle cleaning space (43), and the cleaning space located at the bottom is referred to as the lower cleaning space (45). In addition, the bulkhead that divides the upper cleaning space (41) and the middle cleaning space (43) is referred to as the first bulkhead (42), and the bulkhead that divides the middle cleaning space (43) and the lower cleaning space (45) is referred to as the second bulkhead (44).

Fluid moving parts are installed in each of the first and second bulkheads (42) and (44) so that gas flowing into the lower part of the second cleaning tower (30) can move upward and be discharged through the discharge port (33).

The fluid moving part allows gas to move upward, but blocks liquid from moving downward.

The fluid movement unit comprises a gas movement pipe (51) installed to vertically penetrate the first or second bulkhead (42)(44) to form a passage for gas movement, a blocking cover (55) installed above the gas movement pipe (51) to block falling liquid from flowing into the interior of the gas movement pipe (51), and a separation member (53) having an upper portion connected to the blocking cover (55) and a lower portion connected to the gas movement pipe (51) to separate the blocking cover (55) from the upper portion of the gas movement pipe (51).

The gas transfer pipe (51) may be installed one or more times in the first bulkhead (42) or the second bulkhead (44). The gas transfer pipe (51) forms a passage through which gas moves by connecting adjacent cleaning spaces in the upper and lower directions.

The upper part of the gas transfer pipe (51) is installed higher than the first bulkhead (42) or the second bulkhead (44). This is to prevent the liquid from flowing into the interior of the gas transfer pipe (51) even if the liquid is accumulated at a certain height in the first bulkhead (42) or the second bulkhead (44).

The blocking cover (55) is installed above the gas transfer pipe (51) to block the falling liquid from flowing into the inside of the gas transfer pipe (51). The blocking cover (55) can be formed in a cone shape with a high center and low edges. The outer diameter of the blocking cover (55) is formed larger than the outer diameter of the gas transfer pipe (51).

The blocking cover (55) is installed spaced apart from the upper part of the gas transfer pipe (51) by a spacer (53). A plurality of blocking covers (55) are installed at regular intervals on the upper part of the gas transfer pipe (51).

Meanwhile, filling layers (46), (47), and (48) are installed inside the second cleaning tower (30). Filling layers are installed in the upper cleaning space (46), the middle cleaning space (47), and the lower cleaning space (48), respectively. The filling layer is a structure filled with filling materials having a large porosity and specific surface area, and the filling materials include pall rings and rasing rings.

In addition, a demister (49a) (49b) (49c) for removing moisture in the gas may be installed inside the second cleaning tower (30). The demister is installed at the top of each cleaning space.

The second cleaning tower (30) described above has a number of cleaning spaces formed, and a chemical solution for removing odorous substances is sprayed into each cleaning space.

The present invention can use a first chemical solution for removing basic malodorous substances in gas, a second chemical solution for removing neutral malodorous substances in gas, and a third chemical solution for removing acidic malodorous substances in gas. Therefore, the present invention can effectively remove various malodorous substances such as acidic, neutral, and basic malodorous substances with one device.

Acidic malodorous substances include hydrogen sulfide, methyl mercaptan, propionic acid, normal butyric acid, and isovaleric acid; neutral malodorous substances include methyl sulfide, methyl disulfide, and acetaldehyde; and basic malodorous substances include ammonia and trimethylamine.

As a first chemical solution for removing basic malodorous substances in gas, a 10% (w/w) sulfuric acid ( _H2SO4 ) solution or nitric acid ( _HNO3 ) solution can be used. In addition, as a second chemical solution for removing neutral malodorous substances in gas, a 12 _% (w/w) sodium hypochlorite (NaOCl) solution or chlorine dioxide ( _ClO2 ) solution can be used. In addition, as a third chemical solution for removing acidic malodorous substances in gas, a 45% (w/w) sodium hydroxide (NaOH) solution or potassium hydroxide (KOH) solution can be used.

The first chemical solution is supplied into the interior of the second cleaning tower (30) through the first chemical solution supply unit and sprayed into one of the multiple cleaning spaces. In the illustrated example, the first chemical solution is supplied into the upper cleaning space (41) and sprayed.

The first chemical solution supply unit comprises a first storage tank (60) in which the first chemical solution is stored, a first supply pipe (61) connected to the first storage tank (60), a first injection nozzle (63) connected to the first supply pipe (61) and installed inside the second cleaning tower (30) and spraying the first chemical solution supplied through the first supply pipe (61), a first circulation pipe (65) for introducing the first chemical solution sprayed from the first injection nozzle (63) into the first storage tank (60), and a first replenishment tank (67) for replenishing the first chemical solution into the first storage tank (60).

The first chemical liquid is stored in the first storage tank (60). The first chemical liquid is supplied to the first injection nozzle (63) through the first supply pipe (61) by the circulation pump (62).

The first injection nozzle (63) is installed in the upper cleaning space (41). The first injection nozzle (63) is installed below the demister (49a). The first chemical liquid is sprayed into the gas flowing into the upper cleaning space (41) through the first injection nozzle (63). The gas comes into contact with the first chemical liquid, and the basic odorous substances contained in the gas are removed. The gas from which the basic odorous substances have been removed is discharged through the discharge port (33).

And the first chemical liquid that is sprayed into the upper cleaning space (41) and comes into contact with the gas flows into the first circulation pipe (65). A first chemical liquid drainage port (64) is formed on the side of the second cleaning tower (30) at a position slightly higher than the first bulkhead (42), and a first circulation pipe (65) is connected to the first chemical liquid drainage port (64). The first circulation pipe (65) is connected to the first storage tank (60). Therefore, the first chemical liquid sprayed from the first injection nozzle (63) flows back into the first storage tank (60) through the first circulation pipe (65) and has a structure in which it is circulated.

The first supplementary tank (67) supplements the first drug solution to the first storage tank (60). The first supplementary tank (67) and the first storage tank (60) are connected to the first supplementary pipe (68). A supplementary pump (69) is installed in the first supplementary pipe (68).

When the water level of the first chemical solution stored in the first storage tank (60) falls below the set water level or the pH of the first chemical solution goes out of the set pH range, the supplementary pump (69) is operated to supply a certain amount of the first chemical solution stored in the first supplementary tank (67) to the first storage tank (60). For this purpose, a water level sensor (60a) and a pH sensor (60b) are installed in the first storage tank (60).

The second chemical liquid supply unit sprays the second chemical liquid into any one of the cleaning spaces other than the cleaning space where the first chemical liquid is sprayed to remove neutral odor substances in the gas. In the illustrated example, the second chemical liquid supply unit supplies and sprays the second chemical liquid into the intermediate cleaning space (43).

The second chemical solution supply unit comprises a second storage tank (70) in which the second chemical solution is stored, a second supply pipe (71) connected to the second storage tank (70), a second injection nozzle (73) connected to the second supply pipe (71) and installed inside the second cleaning tower (30) and spraying the second chemical solution supplied through the second supply pipe (71), a second circulation pipe (75) for introducing the second chemical solution sprayed from the second injection nozzle (73) into the second storage tank (70), and a second replenishment tank (77) for replenishing the second chemical solution to the second storage tank (70).

The second storage tank (70) stores the second chemical solution. The second storage tank (70) may be installed at the bottom of the second cleaning tower (30). The second chemical solution is supplied to the second injection nozzle (73) through the second supply pipe (71) by the circulation pump (72). The second storage tank (70) may be installed adjacent to the third storage tank (80) described later.

The second injection nozzle (73) is installed in the intermediate cleaning space (43). The second injection nozzle (73) is installed below the demister (49b). The second chemical liquid is sprayed into the gas flowing into the intermediate cleaning space (43) through the second injection nozzle (73). The gas comes into contact with the second chemical liquid, and neutral odorous substances contained in the gas are removed. The gas from which the neutral odorous substances have been removed passes through the first partition (42) and flows into the upper cleaning space (41).

And the second chemical liquid that is sprayed into the intermediate cleaning space (43) and comes into contact with the gas flows into the second circulation pipe (75). A second chemical liquid drainage port (74) is formed on the side of the second cleaning tower (30) at a position slightly higher than the second bulkhead (44), and a second circulation pipe (75) is connected to the second chemical liquid drainage port (74). The second circulation pipe (75) is connected to the second storage tank (70). Therefore, the second chemical liquid sprayed from the second injection nozzle (73) flows back into the second storage tank (70) through the second circulation pipe (75) and is circulated.

The second supplementary tank (77) supplements the second liquid to the second storage tank (70). The second supplementary tank (77) and the second storage tank (70) are connected to the second supplementary pipe (78). A supplementary pump (79) is installed in the second supplementary pipe (78).

When the water level of the second chemical solution stored in the second storage tank (70) falls below the set water level or the redox potential value of the second chemical solution goes out of the set range, the second supplementary pump (79) is operated to supply a certain amount of the second chemical solution stored in the second supplementary tank (77) to the second storage tank (70). For this purpose, a water level sensor (70a) and a redox potential measuring sensor (70b) are installed in the second storage tank (70).

The third chemical solution supply unit sprays the third chemical solution into the remaining cleaning spaces, excluding the cleaning spaces where the first chemical solution is sprayed and the cleaning spaces where the second chemical solution is sprayed, to remove acidic odor substances in the gas. In the illustrated example, the third chemical solution supply unit supplies and sprays the third chemical solution into the lower cleaning space (45).

The third chemical solution supply unit is equipped with a third storage tank (80) in which the third chemical solution is stored, a third supply pipe (81) connected to the third storage tank (80), a third injection nozzle (83) connected to the third supply pipe (81) and installed inside the second cleaning tower (30) to spray the third chemical solution supplied through the third supply pipe (81), and a third supplement tank (87) for supplementing the third chemical solution to the third storage tank (80).

The third chemical liquid is stored in the third storage tank (80). The third storage tank (80) can be installed at the bottom of the second cleaning tower (30). The third storage tank (80) is connected to the lower cleaning space (45) of the second cleaning tower (30). Therefore, the third chemical liquid sprayed into the lower cleaning space (45) flows directly into the third storage tank (80) after coming into contact with the gas.

The third liquid is supplied to the third injection nozzle (83) through the third supply pipe (81) by the circulation pump (82).

The third injection nozzle (83) is installed in the lower cleaning space (45). The third injection nozzle (83) is installed below the demister (49c). The third chemical liquid is sprayed into the gas flowing into the lower cleaning space (45) through the third injection nozzle (83). The gas comes into contact with the third chemical liquid, and the acidic odorous substances contained in the gas are removed. The gas from which the acidic odorous substances have been removed passes through the second bulkhead (44) and flows into the intermediate cleaning space (43). Then, the third chemical liquid that has been sprayed into the lower cleaning space (45) and has come into contact with the gas flows into the third storage tank (80).

The third supplementary tank (87) supplements the third drug solution to the third storage tank (80). The third supplementary tank (87) and the third storage tank (80) are connected to the third supplementary pipe (88). A supplementary pump (89) is installed in the third supplementary pipe (88).

When the water level of the third chemical solution stored in the third storage tank (80) falls below the set water level or the pH value of the third chemical solution goes out of the set range, the third supplementary pump (89) is operated to supply a certain amount of the third chemical solution stored in the third supplementary tank (87) to the third storage tank (80). For this purpose, a water level sensor (80a) and a pH sensor (80b) are installed in the third storage tank (80).

The above-described composite odor treatment unit divides the interior of the second cleaning tower (30) into a number of cleaning spaces and then sprays the first chemical solution, the second chemical solution, and the third chemical solution into each cleaning space, so that even if various odorous substances such as acidic, neutral, and basic substances are mixed, effective odor treatment is possible.

The water treatment unit removes any remaining odor substances from the gas by bringing the gas that has passed through the combined odor treatment unit into contact with water.

The illustrated washing unit comprises a cooling tower (100) into which gas discharged from a second washing tower (30) is introduced, a cooling water storage tank (90) installed at the bottom of the cooling tower (100) and storing cooling water, a pump (93) installed in the cooling water storage tank (90), a cooling water supply pipe (91) connected to the discharge port of the pump (93), a cooling water spray nozzle (92) connected to the cooling water supply pipe (91) and installed inside the cooling tower (100) to spray cooling water supplied through the cooling water supply pipe (91) to bring it into contact with gas, and a cooler (98) for cooling the cooling water stored in the cooling water storage tank (90).

The cooling tower (100) has an inlet (101) formed at the bottom through which gas flows in, and an outlet (103) formed at the top through which gas flows out. A fourth gas discharge pipe (35) is connected to the inlet (101). Gas discharged from the second cleaning tower (30) flows into the cooling tower (100) through the fourth gas discharge pipe (35). The gas that flows into the cooling tower (100) moves upward from the inside of the cooling tower (100) and is discharged to the outside through the outlet (103). A treatment gas discharge pipe (105) is connected to the outlet (103).

A packing layer (107) and a demister (109) are installed inside the cooling tower (100). The packing layer (107) is installed below the cooling water injection nozzle (92). The packing layer (107) has a structure filled with a filling material having a large porosity and specific surface area, and a pall ring, a rasing ring, etc. are used as the filling material. In addition, a demister (109) for removing moisture in the gas is installed above the cooling water injection nozzle (92).

The cooling water storage tank (90) is installed at the bottom of the cooling tower (100). The interior of the cooling tower (100) and the interior of the cooling water storage tank (90) are installed so as to be in communication. A water level sensor (94) and a temperature sensor (95) are installed in the cooling water storage tank (90).

A pump (93) is installed in a cooling water storage tank (90). Cooling water pumped through the pump (93) flows into a cooling water injection nozzle (92) through a cooling water supply pipe (91). The cooling water injected into the interior of the cooling tower (100) through the cooling water injection nozzle (92) cools the gas and condenses moisture in the gas.

A cooler (98) is installed to maintain the coolant stored in the coolant storage tank (90) at a constant cooling temperature. The coolant stored in the coolant storage tank (90) is structured to be circulated back to the coolant storage tank (90) via the cooler (98) through the coolant circulation line (97).

A heat exchanger (99) connected to a cooling water circulation line (97) is installed inside the cooler (98). The cooling water flowing through the heat exchanger (99) can be cooled to 5°C or less, for example, 2 to 5°C, by a typical refrigeration cycle.

As described above, the present invention pretreats a complex malodor containing a mixture of acidic, neutral, and basic malodor components by oxidizing and decomposing it using a photocatalyst and ozone in the first pretreatment unit and the second pretreatment unit, thereby reducing the malodor load and increasing the malodor removal efficiency even when a high concentration of malodor is introduced.

In addition, the present invention can effectively remove high concentration hydrogen sulfide by using a liquid catalyst. In addition, the present invention can remove a complex odor composed of various odorous substances such as acidic, neutral, and basic odorous substances with one device by bringing different types of chemicals into contact with the odorous substances in stages.

Meanwhile, a second pretreatment unit applied to a multi-stage deodorizing device according to another embodiment of the present invention is illustrated in FIGS. 4 and 5.

Referring to FIGS. 4 and 5, the second pretreatment unit has a contact chamber (9) through which gas discharged from the first pretreatment unit passes, an ozone injection unit (120) installed inside the contact chamber (9), an ozone supply unit for injecting ozone into the ozone injection unit (120), and a driving means for rotating the ozone injection unit (120).

The contact chamber (9) is formed into a square tube structure. One side of the contact chamber (9) is connected to the first gas discharge pipe (4). Gas flows into the contact chamber (9) through the first gas discharge pipe (4). And the other side of the contact chamber (9) is connected to the second gas discharge pipe (7). The gas passing through the contact chamber (9) is discharged through the second gas discharge pipe (7) and flows into the liquid catalyst treatment unit.

The ozone supply unit is equipped with an ozone generator (not shown) and an ozone supply pipe (5) for injecting ozone generated from the ozone generator into the interior of the contact chamber (9).

The ozone injection unit comprises an ozone inlet pipe (121) that is connected to the ozone supply pipe (5) and extends from the outside to the inside of the contact chamber (9) and is rotatably supported by the contact chamber (9), a drum (130) that is connected to the lower portion of the ozone inlet pipe (121) and has a number of first side holes (131) formed at regular intervals on the side, an expandable and contractible elastic sheet (140) that is connected to the inner surface of the drum (130) and is capable of expansion and contraction, a cutting line (141) that is formed on the expandable sheet (140) and is located on the inner side of the first side hole (131), a contact frame (150) that is installed inside the drum (130) and contacts the expandable sheet (140) to the inner surface of the drum (130) and has second side holes (151) formed to correspond to the first side holes (131), and a contact frame (150) that is formed on the lower portion of the drum (130) and It has a rotating shaft (123) that extends outside the contact chamber (9) and is connected to a driving means and can rotate.

The ozone inlet pipe (121) is installed so as to extend from the outside to the inside of the contact chamber (9). Although not shown, the ozone inlet pipe (121) and the ozone supply pipe (5) are connected by a rotary joint. A rotary joint is a common structure and is a type of pipe joint device that connects relatively rotating pipes or devices to each other.

A drum (130) is installed inside the contact chamber (9). The drum (130) has a cylindrical structure. The upper part of the drum (130) is connected to the lower part of the ozone inlet pipe (121). Ozone is introduced into the inside of the drum (130) through the ozone inlet pipe (121).

A number of protruding lips (135) are installed at regular intervals on the side of the drum (130). The protruding lips (135) are formed long from the top to the bottom of the drum (130). When the drum (130) rotates, the protruding lips (135) generate a vortex around the drum (130).

The first side holes (131) are located between the protruding lips (135). The first side hole (131) is formed to penetrate the side of the drum (130). The first side hole (131) is formed in a rectangular shape that is long vertically.

The elastic sheet (140) is attached to the inner surface of the drum (130). The elastic sheet (140) is made of rubber material and can expand and contract.

A cutting line (141) is formed in the elastic sheet (140). The cutting line (141) is formed at a position corresponding to the first side hole (131). The cutting line (141) can be formed by cutting the elastic sheet (140) in a straight line shape with a knife. The cutting line (141) is located on the inside of the first side hole (131). When ozone is introduced into the drum (130), as shown in Fig. 5, the elastic sheet (140) expands and the cutting line (141) opens, causing ozone to be ejected to the outside of the drum (130). Then, when the introduction of ozone is stopped, the elastic sheet (140) contracts and the cutting line (141) is blocked.

The sealing frame (150) is installed inside the drum (130). The sealing frame (150) has a cylindrical structure with the upper and lower parts open. The elastic sheet (140) can be sealed against the inner surface of the drum (130) by the sealing frame (150).

The second side holes (151) are formed in the sealing frame (150). The second side holes (151) are formed to correspond to the first side holes (131). For example, the second side hole (151) is formed in the same position and shape as the first side hole (131).

A rotation shaft (123) is formed at the bottom of the drum (130). The rotation shaft (123) penetrates the bottom of the contact chamber (9) and extends to the outside of the contact chamber (9). The rotation shaft (123) is supported on the contact chamber (9) so as to be rotatable.

The driving means comprises a motor (160), a driving gear (161) coupled to the driving shaft of the motor (160), and a driven gear (163) coupled to the rotating shaft (123) and meshing with the driving gear (161). When the motor (160) operates, the drum (130) rotates at a constant speed inside the contact chamber (9).

By spraying ozone into the gas passing through the inside of the contact chamber (9) through the rotating drum (130) in this way, the contact efficiency with ozone can be greatly improved.

Above, the present invention has been described with reference to one embodiment, but this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible from this. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

1: Gas inlet pipe 10: 1st cleaning tower
30: 2nd cleaning tower 100: Cooling tower
200: Reaction Tower

Claims (6)

A first pretreatment section in which gas containing odorous substances is first oxidized using a photocatalyst;
A second pretreatment section for secondary oxidation treatment by contacting the gas passing through the first pretreatment section with ozone;
A liquid catalyst treatment unit that removes hydrogen sulfide in the gas by bringing the gas that has passed through the second pretreatment unit into contact with a liquid catalyst;
A composite odor treatment unit that sequentially contacts the gas passing through the above liquid catalyst treatment unit with three different types of chemicals to remove acidic, neutral and basic odor substances in the gas;
A water washing unit is provided to remove odorous substances remaining in the gas by bringing the gas that has passed through the above-mentioned composite odor treatment unit into contact with water;
The above second pretreatment unit is provided with a contact chamber through which gas discharged from the first pretreatment unit passes, an ozone injection unit installed inside the contact chamber, an ozone supply unit for injecting ozone into the ozone injection unit, and a driving means for rotating the ozone injection unit.
A multi-stage deodorizing device for removing a composite odor, characterized in that the ozone injection unit comprises an ozone inlet pipe that is connected to the ozone supply unit and extends from the outside to the inside of the contact chamber and is rotatably supported in the contact chamber, a drum that is coupled to the lower portion of the ozone inlet pipe and has a plurality of first side holes formed at regular intervals on the side, an elastic sheet that is coupled to the inner surface of the drum and is capable of expanding and contracting, a cutting line formed in the elastic sheet and positioned on the inner side of the first side hole, a contact frame that is installed inside the drum and adheres the elastic sheet to the inner surface of the drum and has second side holes formed to correspond to the first side holes, and a rotary shaft that is formed on the lower portion of the drum and extends to the outside of the contact chamber and is rotatable by the driving means. A multi-stage deodorizing device for removing a composite odor, characterized in that in claim 1, the photocatalyst includes a visible light-responsive photocatalyst. A multi-stage deodorizing device for removing a composite odor, characterized in that in the first paragraph, the first pretreatment unit comprises a reaction tower into which the gas is introduced, photocatalyst modules installed at regular intervals inside the reaction tower, and lamps installed between the photocatalyst modules. In the first paragraph, the liquid catalyst treatment unit comprises a first cleaning tower into which gas passing through the second pretreatment unit flows downward and is discharged upward, and a liquid catalyst supply means for spraying liquid catalyst into the interior of the first cleaning tower.
The above liquid catalyst supply means comprises a liquid catalyst storage tank installed at the lower portion of the first cleaning tower and connected to the interior of the first cleaning tower and storing a liquid catalyst, a liquid catalyst supply pipe through which the liquid catalyst moves by a circulation pump installed in the liquid catalyst storage tank, a liquid catalyst injection nozzle connected to the liquid catalyst supply pipe and installed inside the first cleaning tower and spraying the liquid catalyst supplied through the liquid catalyst supply pipe, a liquid catalyst replenishment tank for replenishing liquid catalyst to the liquid catalyst storage tank, an aeration means for aerating air in the interior of the liquid catalyst storage tank, and a filter for removing sulfur particles in the liquid catalyst stored in the liquid catalyst storage tank. A multi-stage deodorizing device for removing a composite odor. In the first paragraph, the composite odor treatment unit is a multi-stage deodorizing device for removing a composite odor, characterized in that it comprises a second cleaning tower into which gas passing through the liquid catalyst treatment unit flows downward and is discharged upward, a plurality of partition walls installed vertically inside the second cleaning tower to divide the interior of the second cleaning tower into a plurality of cleaning spaces, a first chemical supply unit for spraying a first chemical solution into any one of the cleaning spaces to remove alkaline odor substances in the gas, a second chemical supply unit for spraying a second chemical solution into any one of the remaining cleaning spaces excluding a cleaning space into which the first chemical solution is sprayed to remove neutral odor substances in the gas, and a third chemical supply unit for spraying a third chemical solution into the remaining cleaning spaces excluding a cleaning space into which the first chemical solution is sprayed and a cleaning space into which the second chemical solution is sprayed to remove acidic odor substances in the gas. delete

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