CN115259519A - Municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method - Google Patents
Municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of municipal sludge treatment, and particularly relates to a municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method, which comprises the following steps: the digestive juice enters an adjusting tank, is stirred and homogenized, enters a ceramic membrane for cross-flow filtration to remove suspended matters, and the clear liquid enters negative pressure ammonia distillation to remove ammonia nitrogen and enters ozone catalytic oxidation to remove COD. Compared with the traditional biochemical processes such as nitrification-denitrification and the like, the method has the advantages of high ammonia nitrogen removal rate, no secondary sludge, strong treatment capacity, good treatment effect and the like, can effectively treat the municipal sludge pyrohydrolysis anaerobic digestion solution, and ensures that the treated suspension, COD and ammonia nitrogen meet the grade of the Water quality Standard for discharging sewage into urban sewers (CJ 343-2010) A and the like.
Description
Technical Field
The invention belongs to the technical field of municipal sludge treatment, and particularly relates to a municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method.
Background
In recent years, municipal sludge pyrohydrolysis technology has gradually started to be applied. Organic matters in the sludge subjected to high-temperature pyrohydrolysis pretreatment are released, the amount of methane generated by subsequent anaerobic digestion is increased, the sanitation indexes of the sludge are improved, and the pyrohydrolysis contributes to reduction, stabilization, harmlessness and recycling of the anaerobic digestion of the sludge, but the pyrohydrolysis anaerobic digestion of the sludge also brings a non-negligible problem.
High temperature of pyrohydrolysis can generate dark refractory substances, which causes difficult dehydration, reduced sludge particle size, enhanced uniformity and poor settleability, so that the sludge pyrohydrolysis anaerobic digestion solution is difficult to treat. At present, the commonly used sludge pyrohydrolysis anaerobic digestion solution treatment method is that the sludge is refluxed to the front end of a water inlet of a municipal sewage treatment plant, diluted and treated by an activated sludge method, so that the load of a sewage treatment system is increased, a solid-liquid separation flocculating agent is added in a large amount, the separation is not thorough, the filtrate suspension is high, the removal effect of the difficultly degraded COD is poor, the denitrification load is low, the efficiency is low, and the pollutants are accumulated again after long-time operation. Therefore, there is a great need for improvement of the prior art.
Disclosure of Invention
The invention aims to provide a novel treatment method of municipal sludge pyrohydrolysis anaerobic digestion liquid, which solves the problems of high filtrate suspended matter, low denitrification load efficiency and poor removal effect of nondegradable COD (chemical oxygen demand) in the prior art and meets the requirement of standard discharge of digestion liquid COD and ammonia nitrogen nano-tubes.
The invention provides a municipal sludge pyrohydrolysis anaerobic digestion solution treatment method which comprises a ceramic membrane cross-flow filtration unit, a negative pressure deamination unit and an ozone catalytic oxidation unit which are operated in series. After the anaerobic digestion solution is subjected to dynamic cross-flow filtration by a ceramic membrane and is subjected to negative pressure ammonia distillation treatment, the main pollutant indexes meet the emission standard after the wastewater is subjected to ozone high catalytic oxidation treatment; the method specifically comprises the following steps:
(1) The method comprises the following steps of (1) allowing municipal sludge pyrohydrolysis anaerobic digestion liquid to enter a regulating tank for regulating the digestion liquid amount, wherein the initially added regulating tank digestion liquid amount is at least 2 times of the amount of generated permeation clear liquid;
(2) Pumping the digestive juice into a ceramic membrane cross-flow filtration unit from an adjusting tank at a certain filtration pressure for solid-liquid separation to remove suspended matters, obtaining a clear solution in a clear solution tank, refluxing the concentrated solution to the adjusting tank through a concentrated solution return pipe, maintaining the filtration pressure of 0.1 MPa-0.2 MPa through valve control, and discharging the concentrated solution into a subsequent treatment unit when the solid content of the concentrated solution reaches 15%;
(3) The filtered clear liquid in the clear liquid tank enters a negative pressure ammonia still to remove ammonia nitrogen, and CO generated by evaporation in negative pressure deamination 2 And the ammonia-containing mixed gas is firstly passed through an alkali liquor absorption device to remove CO 2 Then absorbing ammonia by acid;
(4) The effluent of the negative pressure ammonia still enters ozone catalytic oxidation to remove the COD which is difficult to degrade.
Furthermore, the ceramic membrane cross-flow filtering unit of the municipal sludge pyrohydrolysis anaerobic digestion solution treatment method comprises a filtering element and a filtering element, wherein the filtering element comprises a hollow rotating shaft and a disc-shaped hollow ceramic membrane, and the disc-shaped hollow ceramic membranes are sleeved on the periphery of the hollow rotating shaft in parallel and rotate together with the hollow rotating shaft under the driving of the hollow rotating shaft; the surface of the hollow rotating shaft is provided with a through hole which is communicated with the inside of the disc-shaped hollow ceramic membrane.
Furthermore, the disc-shaped hollow ceramic membrane is made of alumina, the aperture is 0.05-2 μm, the filtering pressure is 0.1-0.2 MPa, and the rotating speed of the middle rotating shaft is controlled at 400-800 rpm/min.
Further, in the negative pressure ammonia distillation unit of the municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method, alkali is not added in the treatment process, the filtered clear liquid and tower bottom effluent are subjected to heat exchange to 50-70 ℃, and then are uniformly distributed by a distributor and enter the upper part of a negative pressure ammonia distillation tower, the negative pressure ammonia distillation can be a packed tower, and the packing is pall ring, wire mesh packing or plate corrugated packing.
Further, the steam at the bottom of the tower is heated to the set temperature of 70-90 ℃, a vacuum pump is started to pump negative pressure to the tower, the vacuum degree is-0.02 MPa-0.08 MPa, the clear liquid is contacted with the ascending steam in the column, and the retention time of the clear liquid is 1-5 h.
Further, in the ozone catalytic oxidation unit of the municipal sludge pyrohydrolysis anaerobic digestion solution treatment method, a catalyst is a heterogeneous catalyst, an aluminum base or an active carbon base, the ozone concentration is 5.0mg/min, and the treatment time is 0.5-3 h. When the sewage contacts with the catalyst, organic matters are firstly adsorbed on the surfaces of the catalyst to form surface chelates with affinity, so that the ozone oxidation is more efficient; in addition, ozone molecules are easy to decompose under the action of the catalyst to generate hydroxyl free radicals with high oxidizability, so that the oxidation efficiency of ozone is improved, and a better catalytic ozone oxidation effect is realized.
Furthermore, a steam inlet of the negative-pressure ammonia distillation tower is connected with a steam supply pipeline used by a thermal hydrolysis boiler, and the deamination is carried out by heating steam generated by the boiler.
Further, the exhaust gas treatment device may be one or more of conventional exhaust gas treatment devices in the prior art, such as catalyst treatment, spray absorption, and the like.
The method has the advantages of high removal rate of suspended solid, high ammonia nitrogen removal rate, no secondary sludge, strong comprehensive pollutant treatment capacity, strong impact resistance, good treatment effect and the like. The invention has the following beneficial effects:
(1) The filtering unit provided by the invention can realize the medicament-free filtering separation of solid and liquid phases in the anaerobic digestion liquid; the ceramic membrane has high physical and chemical stability, has strong adaptability and stability to the treatment of anaerobic digestive fluid with complex composition and large property fluctuation, is not easy to pollute the membrane, has good cleaning and recovery effects, has low suspension of the treated clear liquid, and preserves the alkalinity of the original digestive fluid.
(2) The negative-pressure ammonia distillation unit provided by the invention fully utilizes a large amount of carbonate (hydrogen) contained in anaerobic effluent of sludge, and utilizes steam of a pyrohydrolysis boiler to evaporate and deaminate filtered clear liquid under negative pressure so as to remove ammonia nitrogen and CO decomposed by carbonate 2 The innovation that the pH value is adjusted without adding alkali in the treatment process is realized.
(3) The municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method does not generate secondary sludge, has good operation elasticity, can respond to water quality fluctuation by changing process parameters, and has shock resistance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention.
FIG. 1 is a process flow diagram of a municipal sludge pyrohydrolysis anaerobic digester treatment method according to one embodiment of the invention.
FIG. 2 is a diagram of an apparatus for a method of treating a municipal sludge pyrohydrolysis anaerobic digester effluent according to one embodiment of the invention;
FIG. 1-adjustment tank; 2-a stirrer and a motor; 3-raw material feeding pipe; 4-concentrated solution discharge pipe; 5-concentrated solution return pipe; 6-a filtration vessel; 7-a feed pump; 8-a reflux valve; 9-a disc-like hollow ceramic membrane; 10-a feed pipe; 11-a motor; 12-pressure gauge; 13-a hollow rotating shaft; 14-clear liquid collecting tube; 15-a liquid flow meter; 16-clear liquid tank; 17-a heat exchanger; 18-a feed pump; 19-clear liquid feed pipe; 20-a discharge pump; 21-a discharge pipe; 22-a vacuum pump; 23-an air outlet pipe; 24-the tail gas pipe; 25-steam pipe; 26-a feed pipe; 27-a catalyst support layer; 28-a catalyst-filled layer; 29-a gas flow meter; 30-an ozone generator; 31-a water outlet pipe; 32-negative pressure ammonia still; 33-a distributor; 34-a filler; 35-ozone catalytic oxidation tower.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The examples do not specify particular techniques or conditions, and are to be construed in accordance with the description of the art in the literature or with the specification of the product.
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", and the like indicate orientations or state relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the following examples, the equipment and the like used are conventional products which are available from regular vendors, not indicated by manufacturers. The process is conventional unless otherwise specified, and the starting materials are commercially available from the open literature.
Example 1
As shown in fig. 1, the embodiment provides a method for treating municipal sludge pyrohydrolysis anaerobic digestion solution, and relates to a device which mainly comprises a ceramic membrane cross-flow filtration unit, a negative pressure ammonia distillation unit and an ozone catalytic oxidation unit which are operated in series; the ceramic membrane cross-flow filtration unit mainly comprises a ceramic membrane cross-flow filtration container 6, a canning container, a hollow rotating shaft 13 and a disc-shaped hollow ceramic membrane 9, wherein the hollow rotating shaft 13 and the disc-shaped hollow ceramic membrane 9 are arranged in the canning container, and the disc-shaped hollow ceramic membranes 9 are sleeved on the periphery of the hollow rotating shaft 13 in parallel and rotate together with the hollow rotating shaft 13 under the drive of the hollow rotating shaft 13; the surface of the hollow rotating shaft 13 is provided with through holes which are communicated with the inside of the disc-shaped hollow ceramic membrane 9, the disc-shaped hollow ceramic membrane 9 is made of alumina, the aperture is 0.05 to 2 mu m, and the filtering pressure is 0.1 to 0.2MPa; the negative pressure ammonia distillation unit adopts a negative pressure ammonia distillation tower 32, filtered clear liquid exchanges heat with water discharged from the bottom of the negative pressure ammonia distillation tower 32 to 50-70 ℃, and then the filtered clear liquid and the water are uniformly distributed on the upper part of the negative pressure ammonia distillation tower 32 through a distributor, the main body of the ozone catalytic oxidation unit is an ozone catalytic oxidation tower 35, the ozone catalytic oxidation tower 35 adopts a packed tower, the packing in the tower is a catalyst, and the catalyst is a heterogeneous catalyst, an aluminum base or an active carbon base.
As shown in fig. 2, the digestion solution is pumped into a regulating tank 1 through a raw material feeding pipe 3 to regulate the digestion solution amount, and a stirrer and a motor 2 are started; when the amount of the digestion liquid added into the adjusting tank reaches 80% of the volume, a feed pump 7 is started, the digestion liquid is pumped into a ceramic membrane cross-flow filtration container 6 through a feed pipe 10, clear liquid filtered by a disc-shaped hollow ceramic membrane is collected and discharged into a clear liquid tank through a hollow rotating shaft 13, dynamic cross-flow filtration of the anaerobic digestion liquid is completed, a control motor 11 maintains the rotating speed of the hollow rotating shaft 13 at 400-800 r/min during dynamic cross-flow filtration, the permeated clear liquid enters the clear liquid tank 16 through a clear liquid collecting pipe 14, the concentrated liquid flows back to the adjusting tank 1 through a concentrated liquid return pipe 5, the filtering pressure is maintained at 0.1 MPa-0.2 MPa through the feed pump 7 and a return valve 8, and a pressure gauge 12 is arranged on the return pipe 5; when the solid content in the adjusting tank 1 reaches 15%, the anaerobic digestion solution concentrated solution is discharged outside through a tank bottom concentrated solution discharge pipe 4, and the concentrated solution can be subjected to filter pressing or drying treatment through a plate frame and then treated in modes of land utilization and the like.
Clear liquid generated by dynamic cross flow filtration enters a negative pressure ammonia still 32 through a clear liquid feeding pipe 19 under the action of a feeding pump 18, the negative pressure ammonia still 32 adopts a packed tower and is uniformly distributed by a distributor 33, and steam is introduced into the tower bottom and is heated to the temperature of 70-90 ℃; the steam at the bottom of the tower rises to perform contact exchange reaction with the clear liquid of the anaerobic digestion liquid in the filler 34, the residence time of the clear liquid is 1-5 h, and the clear liquid feeding pipe 19 is provided with a liquid flow meter 15. The vacuum pump 22 is used for vacuum pumping in the ammonia still with the operating pressure of-0.02 MPa to-0.08 MPa, the steam pipe 25 is connected with the bottom of the tower, the steam comes from a thermal hydrolysis boiler, the steam generated by the boiler is used for heating to carry out negative pressure deamination, and CO decomposed by carbonate in the anaerobic digestion solution 2 And the gas part containing a large amount of ammonia enters into CO through the gas outlet pipe 23 2 An absorption and ammonia recovery unit for removing CO by an alkali liquor absorption device 2 Then absorbing ammonia by acid, wherein the acid is aqueous solution of inorganic acid and/or organic acid, such as one or more aqueous solutions of inorganic acid such as sulfuric acid, hydrochloric acid, phosphoric acid, carbonic acid and the like or organic acid such as citric acid and the like. Liquid in the negative pressure evaporation tower flows downwards to a tower bottom outlet, water discharged from the tower bottom is pumped into a heat exchanger 17 through a discharge pipe 21 and a discharge pump 20, the water exchanges heat with water fed into a negative pressure ammonia distillation tower 32 and then enters an ozone catalytic oxidation tower 35 through a feed pipe 26, the ozone catalytic oxidation tower 35 adopts a packed tower, packing in the tower is a catalyst to form a catalyst packing layer 28, and the lower part of the catalyst packing layer is supported by a catalyst support layer 27. The ozone generator 30 is connected with the bottom of the ozone catalytic oxidation tower 35, an air inlet valve and a gas flowmeter 29 are arranged on a connecting pipeline, the concentration of ozone required by ozone catalytic oxidation is 5.0mg/min, the treatment time is 0.5 h-3 h, tail gas is discharged by the tail gas pipe 24 for post treatment, and liquid is discharged by the water outlet pipe 31 after treatment.
Example 2
As shown in fig. 1 and 2, the apparatus according to the present embodiment is substantially the same as that of embodiment 1, and the main difference lies in the selection of parameters. The water content of the pyrohydrolysis anaerobic digestion liquid for the urban sludge is 92-95 percent, and the components are as follows: COD is 2000 mg/L-3000 mg/L, NH 3 N is 2500mg/L to 3000mg/L, pH is 7.5 to 8.0, and the treatment system in the embodiment 1 of the invention is used for treatment, and the specific steps are as follows:
(1) The digestive juice is pumped into the adjusting tank 1 for water amount adjustment.
(2) Pumping the digestion solution into a ceramic membrane cross-flow filtration container 6, and carrying out dynamic cross-flow filtration on the anaerobic digestion solution, wherein the pore diameter of the ceramic membrane is as follows: 2 μm. Obtaining a clear solution in a clear solution tank 16, returning the concentrated solution to the regulating tank 1 through a concentrated solution return pipe 5, and maintaining the filtering pressure to be 0.1MPa through a feeding pump 7 and a return valve 8; the dynamic cross-flow filtration is carried out at normal temperature, the motor 11 is controlled to maintain the rotating speed of the hollow rotating shaft at 800r/min, clear liquid continuously flows into the clear liquid tank 16, the operation is stopped when the solid content in the adjusting tank 1 reaches 15%, and the concentrated solution of the anaerobic digestion solution is discharged out through the concentrated solution discharge pipe 4 at the bottom of the tank. The COD of the clear liquid obtained by filtering and separating the anaerobic digestion liquid is 2210mg/L, the ammonia nitrogen is 2842mg/L, and the suspended matters are 110mg/L.
(3) Clear liquid generated by dynamic cross flow filtration enters a negative pressure ammonia distillation tower and then is uniformly distributed by a distributor, a vacuum pump 22 is utilized to carry out negative pressure vacuum pumping in the ammonia distillation tower, the operation pressure is-0.02 MPa, when the negative pressure evaporation temperature is 88 ℃, the mass concentration of the ammonia nitrogen in the effluent of the sludge digestion liquid is reduced from 2842mg/L to 31mg/L after the ammonia is subjected to negative pressure ammonia distillation.
(4) After being subjected to dynamic cross flow filtration by the ceramic membrane, the anaerobic digestion solution is subjected to negative pressure deamination treatment on a water sample, wherein the COD measurement value is 2210mg/L, the selected catalyst is an aluminum-based supported catalyst, the ozone concentration is 5.0mg/min, and the COD concentration after the treatment is reduced to 480mg/L.
Example 3
As shown in fig. 1 and 2, the apparatus according to the present embodiment is substantially the same as that of embodiment 1, and the main difference lies in the selection of parameters. The water content of the pyrohydrolysis anaerobic digestion liquid of certain urban sludge is 90-92 percent, and the components are as follows: COD is 2800 mg/L-3200 mg/L, NH 3 the-N is 2600mg/L to 2800mg/L, the pH is 7.6 to 8.0The processing system in embodiment 1 of the present invention is used for processing, and the specific steps are as follows:
(1) The digestive juice is pumped into the adjusting tank 1 for water amount adjustment.
(2) Pumping the digestion solution into a ceramic membrane cross-flow filtering container 6, and carrying out dynamic cross-flow filtration on the anaerobic digestion solution, wherein the pore diameter of the ceramic membrane is as follows: 0.5 μm. Obtaining a clear solution passing through a clear solution tank 16, returning the concentrated solution to the regulating tank 1 through a concentrated solution return pipe 5, and maintaining the filtering pressure at 0.2MPa through a feeding pump 7 and a return valve 8; the dynamic cross-flow filtration is carried out at normal temperature, the motor 11 is controlled to maintain the rotating speed of the hollow rotating shaft at 600r/min, clear liquid continuously flows into the clear liquid tank 16, the operation is stopped when the solid content in the adjusting tank 1 reaches 15%, and the concentrated solution of the anaerobic digestion solution is discharged out through the concentrated solution discharge pipe 4 at the bottom of the tank. The COD of clear liquid obtained by filtering and separating anaerobic digestion liquid is 2760mg/L, the ammonia nitrogen is 2800mg/L, and the suspended matters are 13mg/L.
(3) And (3) enabling clear liquid generated by dynamic cross flow filtration to enter a negative pressure ammonia distillation tower and then to be uniformly distributed by a distributor, carrying out negative pressure vacuum pumping in the ammonia distillation tower by using a vacuum pump 22, wherein the operation pressure is-0.08 MPa, and when the negative pressure evaporation temperature is 67-70 ℃, the mass concentration of ammonia nitrogen in the effluent of the sludge digestive liquid is reduced to 40mg/L from 2800mg/L after the ammonia is subjected to negative pressure ammonia distillation.
(4) After being subjected to dynamic cross flow filtration by the ceramic membrane, the anaerobic digestion solution is subjected to negative pressure deamination treatment on a water sample, wherein the COD (chemical oxygen demand) measurement value is 2760mg/L, the selected catalyst is an aluminum-based supported catalyst, the ozone concentration is 5.0mg/min, and the COD concentration after treatment is reduced to 485mg/L.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein. It should be noted that variations and modifications, such as simple adjustment of parameters within or around the specified parameters, which would not affect the effectiveness of the invention and its patentability, can be made by those skilled in the art without departing from the inventive concept. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method is characterized by comprising the following steps: comprises a ceramic membrane cross-flow filtering unit, a negative pressure ammonia distilling unit and an ozone catalytic oxidation unit which are connected in series; the processing steps are as follows:
(1) Feeding municipal sludge pyrohydrolysis anaerobic digestion liquid into a regulating tank;
(2) Sending the digestive juice into a ceramic membrane cross-flow filtration unit at a certain filtration pressure for solid-liquid separation to remove suspended matters, obtaining filtered clear liquid, refluxing the concentrated solution to the adjusting tank, maintaining the filtration pressure at 0.1 MPa-0.2 MPa, and discharging the concentrated solution into a subsequent treatment unit when the solid content of the concentrated solution reaches 15%;
(3) The filtered clear liquid enters a negative pressure ammonia distillation unit to remove ammonia nitrogen;
(4) And the effluent of the negative pressure ammonia distillation unit enters an ozone catalytic oxidation unit to remove the COD which is difficult to degrade.
2. The municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method according to claim 1, characterized in that: the ceramic membrane cross-flow filtering unit comprises a hollow rotating shaft and a disc-shaped hollow ceramic membrane, wherein the disc-shaped hollow ceramic membrane is sleeved on the periphery of the hollow rotating shaft in parallel and rotates together with the hollow rotating shaft under the driving of the hollow rotating shaft; the surface of the hollow rotating shaft is provided with a through hole which is communicated with the inside of the disc-shaped hollow ceramic membrane.
3. The municipal sludge pyrohydrolysis anaerobic digester treatment method according to claim 2, characterized in that: the disc-shaped hollow ceramic membrane is made of alumina, the aperture is 0.05-2 μm, the filtering pressure is 0.1-0.2 MPa, and the rotating speed of the middle rotating shaft is controlled at 400-800 rpm/min.
4. The municipal sludge pyrohydrolysis anaerobic digester treatment method according to claim 1, characterized in that: the negative pressure ammonia distillation unit adopts a negative pressure ammonia distillation tower, filtered clear liquid exchanges heat with water discharged from the bottom of the negative pressure ammonia distillation tower to 50-70 ℃, the filtered clear liquid is uniformly distributed by a distributor and enters the upper part of the negative pressure ammonia distillation tower, steam is introduced into the bottom of the negative pressure ammonia distillation tower to be heated to 70-90 ℃, a vacuum pump is started to pump negative pressure to the negative pressure ammonia distillation tower, the vacuum degree is-0.02 MPa to-0.08 MPa, the clear liquid is contacted with rising steam in the column, and the clear liquid stays for 1-5 h.
5. The municipal sludge pyrohydrolysis anaerobic digester treatment method according to claim 1, characterized in that: the catalyst of the ozone catalytic oxidation unit is a heterogeneous catalyst, an aluminum base or an active carbon base, the concentration of ozone is 5.0mg/min, and the treatment time is 0.5-3 h.
6. The municipal sludge pyrohydrolysis anaerobic digester treatment method according to claim 1, characterized in that: in the step (3), a steam inlet of the negative-pressure ammonia still is connected with a steam supply pipeline used by a thermal hydrolysis boiler, and steam generated by the boiler is used for heating to perform negative-pressure deamination.
7. The municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method according to claim 1, characterized in that: in the step (3), CO generated by evaporation in the negative-pressure ammonia evaporation unit 2 And the ammonia-containing mixed gas is firstly passed through an alkali liquor absorption device to remove CO 2 Then absorbing ammonia by acid, wherein the acid is aqueous solution of inorganic acid and/or organic acid.
8. The municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method according to claim 1, characterized in that: the ozone catalytic oxidation unit adopts a packed tower, the packing in the tower is a catalyst, and the gas outlet of the packed tower is connected with a tail gas treatment device.
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