CN113620552A - Clean and efficient sewage plant sludge source treatment system and method - Google Patents

Clean and efficient sewage plant sludge source treatment system and method Download PDF

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Publication number
CN113620552A
CN113620552A CN202111185607.8A CN202111185607A CN113620552A CN 113620552 A CN113620552 A CN 113620552A CN 202111185607 A CN202111185607 A CN 202111185607A CN 113620552 A CN113620552 A CN 113620552A
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sludge
tank
damo
conveying pipeline
anaerobic digestion
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王秀宁
孙鹏举
隋鹏
曹磊
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Cecep Runda Yantai Environmental Protection Co ltd
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Cecep Runda Yantai Environmental Protection Co ltd
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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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery

Abstract

The invention discloses a clean and efficient sewage plant sludge source treatment system and method, which comprises a sludge thermal hydrolysis system, a sludge anaerobic digestion system, a DAMO-Anammox reaction system, a low-temperature drying system, a gas storage tank, a water storage tank, a dehydrator and a steam boiler.

Description

Clean and efficient sewage plant sludge source treatment system and method
Technical Field
The invention relates to the technical field of municipal sewage and sludge treatment, in particular to a clean and efficient system and a method for treating sludge sources of a sewage plant.
Background
The sludge generally refers to solid-liquid mixed flocculent substances generated in a sewage treatment plant in the sewage treatment process, and mainly comes from the process links of a primary sedimentation tank, a secondary sedimentation tank and the like. The sludge production per ten thousand tons of sewage treated is generally about 10-20 tons (according to the water content of 90%). The sludge mainly comprises various microorganisms, organic and inorganic particles, and also contains harmful substances such as heavy metals, organic pollutants, pathogenic microorganisms, parasitic ova and the like, and is a solid waste with great harmfulness.
The traditional sludge final disposal modes comprise land utilization, sanitary landfill, incineration treatment and the like. However, in any disposal method, the water content of the sludge is required to be less than 60%, even less than 40%. The water content of the residual sludge generated by urban sewage plants is 99%, and how to efficiently, energy-saving and stably reduce the water content of the sludge from 99% to a usable range becomes an important problem.
Common sludge drying modes include disc drying, paddle drying, low-temperature drying and the like. The disc drying and the paddle drying need to use steam as a heat source, about 1.3-1.5kg of steam is needed for drying 1kg of water, the steam consumption is high, the drying device needs to be used in power plants and incineration plants with a large amount of steam, and the drying device has the problems of high cost, limited applicable site and the like. The low-temperature drying utilizes an air source as an energy source, and the sludge can be dewatered by more than 3.5kg at 1 ℃ and is a process capable of drying the sludge at the source of a sewage plant.
Anaerobic digestion of sludge refers to a biochemical process for controllably converting biodegradable organic matters in the sludge into methane, carbon dioxide and stable substances under the action of anaerobic microorganisms, and is an effective method for stabilizing, recycling and reducing the sludge. Moreover, in order to improve the efficiency of anaerobic digestion of sludge, the sludge is generally pretreated by a thermal hydrolysis process, i.e., high-temperature and high-pressure steam is introduced into a thermal hydrolysis tank to cook the sludge, so that microbial cells are broken, a colloid structure is destroyed, macromolecular organic matters are dissolved out to a liquid phase, and then the macromolecular organic matters are hydrolyzed at high temperature and converted into micromolecules, so that the micromolecules can be efficiently utilized by microorganisms in an anaerobic digestion stage. The tail gas in the pulping stage in the sludge thermal hydrolysis process is usually treated by a series of deodorization systems and then discharged into the atmosphere, so that the heat in the tail gas is dissipated, and the waste of the energy is caused.
In the anaerobic digestion process, the carbon source is converted into clean energy methane, and most of the nitrogen source is converted into ammonia nitrogen. The methane in the air can be collected to be used as energy for power generation or heat supply, and the methane dissolved in the liquid phase can flow out with the fluid and be discharged into the atmosphere, so that on one hand, the waste of the methane energy is caused, and on the other hand, the emission of greenhouse gases is increased (the methane is a greenhouse gas, and the greenhouse effect of the methane is more than 30 times of that of carbon dioxide); the high-concentration ammonia nitrogen can increase the treatment load of a subsequent sewage treatment system, has higher requirements on equipment, and increases the treatment difficulty and the treatment cost.
Anammox (Anammox) is a biological method for treating ammonia nitrogen-containing wastewater, and microorganisms directly oxidize ammonia nitrogen into nitrogen by using nitrite as an oxidant. In 1996 Jetten et al derived the chemical equation of anammox reaction from the changes in the substrate and product of anammox by calculation of Gibbs function (free energy of chemical reaction) and some methods of stoichiometry as follows:
NH4 ++1.32NO2 −+0.066HCO3 −+0.13H+→ 1.02N2+0.26NO3 − +0.066CH2O0.5N0.15+2.03H2O
the treatment effect of the anaerobic ammonia oxidation on ammonia nitrogen needs to control NO2 −And NH4 +And has 1/3 conversion to NO3 −And the denitrification efficiency is reduced.
The Denitrification Anaerobic Methane Oxidation (DAMO) reaction is that microorganisms utilize nitrate or nitrite under Anaerobic conditionsThe nitrate is used as an electron acceptor to oxidize methane into carbon dioxide and generate nitrogen, and the method is a biological method for high-efficiency denitrification. Microorganisms are classified into two types, DAMO bacteria and DAMO archaea, according to the difference of electron acceptors. The electron acceptor of the DAMO bacterium is nitrite, with the equation: 3CH4 + 8NO2 − + 8H+ → 3CO2 + 4N2 + 10H2O; the electron acceptor of the DAMO archaea is nitrate, and the reaction formula is as follows: CH (CH)4 + 4NO3 − → CO2+ 4NO2 − + 2H2And O. Therefore, the DAMO-Anamox mixed culture system can completely remove nitrogen in a system with coexisting methane, nitrate nitrogen, nitrite nitrogen and ammonia nitrogen.
Aiming at the problems, a clean and efficient sewage plant sludge source treatment system and method are designed.
Disclosure of Invention
The invention aims to provide a clean and efficient sewage plant sludge source treatment system and method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a clean and high-efficiency sewage plant sludge source treatment system, which comprises a sludge pyrohydrolysis system, a sludge anaerobic digestion system, a DAMO-Anammox reaction system, a low-temperature drying system, a gas storage tank, a water storage tank, a dehydrator and a steam boiler, the sludge pyrohydrolysis system is connected with a steam boiler and a sludge anaerobic digestion system, the sludge anaerobic digestion system is connected with a gas storage tank, the gas outlet of the gas storage tank is connected with the gas inlet of a steam boiler through a gas conveying pipeline, the DAMO-Anammox reaction system is connected with a sludge anaerobic digestion system, the gas storage tank, a dehydrator and a water storage tank, the water inlet of the water storage tank is connected with the water outlet of the nitrification sedimentation tank of the sewage plant through a sewage conveying pipeline, the low-temperature drying system is connected with the sludge thermal hydrolysis system and the dehydrator, and the dehydrator is connected with the nitrification sedimentation tank of the sewage plant through a sewage conveying pipeline.
As a still further scheme of the invention: the sludge pyrohydrolysis system comprises a slurrying tank, a pyrohydrolysis tank and a flash tank, the slurrying tank, the pyrohydrolysis tank and the flash tank are sequentially communicated through a sludge conveying pipeline, the pyrohydrolysis tank and the flash tank are connected with the slurrying tank through a waste steam pipeline, and the pyrohydrolysis tank is connected with an air outlet of a steam boiler through a steam pipeline.
As a still further scheme of the invention: the sludge anaerobic digestion system comprises an anaerobic digestion tank and a heat exchanger, the flash tank, the heat exchanger and the anaerobic digestion tank are sequentially connected through a sludge conveying pipeline, and a gas outlet of the anaerobic digestion tank is connected with a gas inlet of a gas storage tank through a gas conveying pipeline.
As a still further scheme of the invention: the anaerobic digestion tank is of a cone structure with a wide upper part and a narrow lower part, the anaerobic digestion tank adopts a complete mixing type reactor, and a stirrer is arranged in the reactor.
As a still further scheme of the invention: the DAMO-Anammox reaction system comprises a DAMO-Anammox reactor, wherein the DAMO-Anammox reactor is connected with an anaerobic digestion tank through a sludge conveying pipeline, an air outlet of the DAMO-Anammox reactor is connected with an air inlet of an air storage tank through an air conveying pipeline, a water inlet of the DAMO-Anammox reactor is connected with a water outlet of a water storage tank through a sewage conveying pipeline, and the DAMO-Anammox reactor is connected with a dewatering machine through a sludge conveying pipeline.
As a still further scheme of the invention: the DAMO-Anammox reactor is of a cone structure with a wide upper part and a narrow lower part, and adopts a complete mixing type reactor, and a stirrer is arranged in the reactor.
As a still further scheme of the invention: and a metering pump is arranged on a sewage conveying pipeline between the water storage tank and the DAMO-Anammox reactor.
As a still further scheme of the invention: the low temperature mummification system includes guipure mummification machine and heat recovery refrigerating unit, heat recovery refrigerating unit passes through gas transmission pipeline and is connected with the gas outlet of slurrying jar, guipure mummification machine passes through sludge conveying pipeline and is connected with the hydroextractor.
As a still further scheme of the invention: and a circulating fan is arranged between the heat recovery refrigerating unit and the mesh belt type drying machine.
A clean and high-efficiency treatment method of a sewage plant sludge source treatment system comprises the following steps;
s1, preheating and slurrying wet sludge through a slurrying tank, then enabling the sludge to enter a thermal hydrolysis tank through a sludge conveying pipeline for high-temperature high-pressure hydrolysis, simultaneously maintaining the pressure in the tank body at 0.4-0.8MPa and the temperature at 160-180 ℃, and then enabling the sludge to enter a flash tank through the sludge conveying pipeline, wherein the pressure of the flash tank is maintained at 0.1-0.3 MPa and the temperature is 110 ℃, so that after the sludge is subjected to high-temperature high-pressure hydrolysis and flash tank explosion through the thermal hydrolysis tank, the dispersity of sludge particles and the fluidity of the sludge are improved, pathogenic bacteria are killed, and the sludge is stabilized;
s2, cooling the sludge in the flash tank in a heat exchanger through a sludge conveying pipeline, cooling the temperature from 110 ℃ to 30-35 ℃, allowing the sludge to enter an anaerobic digestion tank through the sludge conveying pipeline for anaerobic fermentation to generate biogas, fully mixing the sludge and microorganisms, keeping the temperature at 30-35 ℃, and discharging the sludge from the anaerobic digestion tank after fermenting for 15-20 days;
s3, conveying the discharged sludge into a DAMO-Anammox reactor through a sludge conveying pipeline, fully and uniformly mixing the sludge components through the DAMO-Anammox reactor, maintaining the temperature at 30-35 ℃, conveying nitrate nitrogen into the DAMO-Anammox reactor through a metering pump from a water storage tank for reaction, and discharging nitrogen generated by the reaction into a gas storage tank through a gas conveying pipeline;
s4, discharging the sludge from the DAMO-Anammox reactor, conveying the sludge to a dehydrator, separating the digested sludge into biogas slurry and biogas residues through the dehydrator, treating the biogas slurry in a sewage plant, and conveying the biogas residues to a mesh belt type drier for low-temperature drying.
Compared with the prior art, the invention has the beneficial effects that:
1. soluble methane in the sludge subjected to anaerobic digestion is used as an electron donor by microorganisms in a subsequent DAMO-Anammox reactor, so that the waste of partial methane energy is avoided, the energy is efficiently utilized, and simultaneously, the methane is greenhouse gas, the greenhouse effect of the methane is more than 30 times that of carbon dioxide, so that the methane is prevented from being lost into the air, and the emission of the greenhouse gas is reduced;
2. in a DAMO-Anammox reactor, nitrate nitrogen in effluent from a nitrification and sedimentation tank of a sewage plant is used as an electron acceptor of microorganisms, soluble methane in sludge is used as an electron donor, and ammonia nitrogen in the sludge is completely removed under the synergistic action of various microorganisms, so that on one hand, no additional medicament is needed in the process, the cost is saved, on the other hand, the ammonia nitrogen is completely removed, the denitrification efficiency is improved, the subsequent sewage treatment load is reduced, and the DAMO-Anammox reactor is economical and environment-friendly;
3. the sludge pyrohydrolysis system, the sludge anaerobic digestion system, the DAMO-Anamox reaction system, the low-temperature drying system, the steam boiler system and the like are comprehensively applied, sludge treatment at the source of a sewage plant is realized, on one hand, the problems of sludge outward transportation and plant establishment are solved, on the other hand, pathogenic bacteria are killed by sludge pyrohydrolysis, anaerobic digestion is used for producing methane and the like, sludge stabilization, resource utilization and reduction are realized, in addition, the low-temperature drying is carried out by utilizing tail gas waste heat of a pulping tank, ammonia nitrogen is removed by soluble methane, and the high-efficiency utilization of energy is realized.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Wherein: 1. a slurrying tank; 2. a thermal hydrolysis tank; 3. a flash tank; 4. a heat exchanger; 5. a water storage tank; 6. a steam boiler; 7. a gas storage tank; 8. an anaerobic digestion tank; 9. a DAMO-Anammox reactor; 10. a dehydrator; 11. a heat recovery refrigeration unit; 12. a mesh belt type drying machine; 13. a steam line; 14. a sludge conveying pipeline; 15. a sewage delivery pipeline; 16. a gas delivery conduit; 17. a waste steam pipeline; 18. a circulating fan; 19. a metering pump.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a clean and efficient system for treating a sludge source in a sewage plant includes a sludge thermal hydrolysis system, a sludge anaerobic digestion system, a DAMO-Anammox reaction system, a low-temperature drying system, a gas storage tank 7, a water storage tank 5, a dewatering machine 10, and a steam boiler 6, the sludge thermal hydrolysis system is connected to the steam boiler 6 and the sludge anaerobic digestion system, the sludge thermal hydrolysis system includes a slurrying tank 1, a thermal hydrolysis tank 2, and a flash tank 3, the slurrying tank 1, the thermal hydrolysis tank 2, and the flash tank 3 are sequentially communicated through a sludge conveying pipeline 14, the thermal hydrolysis tank 2 and the flash tank 3 are both connected to the slurrying tank 1 through a waste steam pipeline 17, the thermal hydrolysis tank 2 is connected to a gas outlet of the steam boiler 6 through a steam pipeline 13, such that wet sludge with a moisture content of about 85% first enters the slurrying tank 1 to be preheated and slurried, then the sludge enters a thermal hydrolysis tank 2 through a sludge conveying pipeline 14 for high-temperature high-pressure hydrolysis, wherein steam generated by a steam boiler 6 provides heat source saturated steam for the thermal hydrolysis tank 2 through a steam pipeline 13, the pressure in the tank body is maintained at 0.4-0.8MPa, the temperature is 160-180 ℃, the steam is fed into a flash tank 3 through the sludge conveying pipeline 14, the pressure in the flash tank 3 is maintained at 0.1-0.3 MPa, the temperature is 110 ℃, waste steam in the thermal hydrolysis tank 2 and the flash tank 3 is fed into a slurrying tank 1 through a waste steam pipeline 17 to provide a heat source for the slurrying tank 1, after the sludge is subjected to high-temperature high-pressure hydrolysis in the thermal hydrolysis tank 2 and is exploded in the flash tank 3, microbial cells are crushed, a colloidal structure is destroyed, macromolecular organic matters are dissolved out to a liquid phase, hydrolysis is carried out at high temperature and converted into small molecules, and the dispersity of the sludge particles is improved, the fluidity of the sludge is improved, and pathogenic bacteria are killed, so that the sludge is more stabilized, the final treatment of the sludge is facilitated, and the pollution to the environment is reduced;
the sludge anaerobic digestion system is connected with a gas storage tank 7, the gas outlet of the gas storage tank 7 is connected with the gas inlet of a steam boiler 6 through a gas conveying pipeline 16, the DAMO-Anamox reaction system is connected with the sludge anaerobic digestion system, the gas storage tank 7, a dehydrator 10 and a water storage tank 5, the sludge anaerobic digestion system comprises an anaerobic digestion tank 8 and a heat exchanger 4, a flash tank 3, the heat exchanger 4 and the anaerobic digestion tank 8 are sequentially connected through a sludge conveying pipeline 14, the gas outlet of the anaerobic digestion tank 8 is connected with the gas inlet of the gas storage tank 7 through the gas conveying pipeline 16, so that the sludge in the flash tank 3 enters the heat exchanger 4 through the sludge conveying pipeline 14 to be cooled, the temperature is reduced to 30-35 ℃ from 110 ℃, the sludge conveying pipeline 14 enters the anaerobic digestion tank 8 to carry out anaerobic fermentation to generate biogas, the anaerobic digestion tank 8 is of a cone structure with a wide upper part and a narrow lower part, the anaerobic digestion tank 8 adopts a complete mixing type reactor, a stirrer is arranged in the reactor, so that sludge and microorganisms can be fully mixed, the temperature is maintained at 30-35 ℃, generated methane is discharged into a gas storage tank 7 through a gas conveying pipeline 16, a part of methane in the gas storage tank 7 is conveyed to a steam boiler 6 as an energy source to generate saturated steam and provide a heat source for the thermal hydrolysis tank 2, and the sludge is discharged from the anaerobic digestion tank 8 after 15-20 days of fermentation and conveyed to a DAMO-Anamox reaction system through a sludge conveying pipeline 14;
the water inlet of the water storage tank 5 is connected with the water outlet of the sewage plant nitrification sedimentation tank through a sewage conveying pipeline 15, the low-temperature drying system is connected with a sludge thermal hydrolysis system and a dewatering machine 10, the dewatering machine 10 is connected with the sewage plant nitrification sedimentation tank through a sewage conveying pipeline 15, the DAMO-Anammox reaction system comprises a DAMO-Anammox reactor 9, the DAMO-Anammox reactor 9 is connected with an anaerobic digestion tank 8 through a sludge conveying pipeline 14, the gas outlet of the DAMO-Anammox reactor 9 is connected with the gas inlet of a gas storage tank 7 through a gas conveying pipeline 16, the water inlet of the DAMO-Anammox reactor 9 is connected with the water outlet of the water storage tank 5 through a sewage conveying pipeline 15, the DAMO-Anammox reactor 9 is connected with the dewatering machine 10 through a sludge conveying pipeline 14, the DAMO-Anammox reactor 9 is of a cone structure with a wide upper part and a narrow part, the DAMO-Anammox reactor 9 adopts a complete mixing type reactor, a stirrer is arranged in the reactor, so that after sludge is conveyed into the DAMO-Anammox reactor 9 through a sludge conveying pipeline 14, the DAMO-Anammox reactor 9 ensures that sludge components are fully and uniformly mixed, the temperature is maintained at 30-35 ℃, a metering pump 19 is arranged on a sewage conveying pipeline 15 between a water storage tank 5 and the DAMO-Anammox reactor 9, then nitrate nitrogen is conveyed into the DAMO-Anammox reactor 9 from the water storage tank 5 through the metering pump 19, the flow rate of the nitrate nitrogen depends on the ammonia nitrogen concentration and the sludge flow rate of the sludge entering the DAMO-Anammox reactor 9, the molar ratio of the nitrogen amount of the nitrate nitrogen to the nitrogen amount of the ammonia nitrogen is slightly larger than 1.1 as much as possible, the water storage tank 5 is supplemented by a nitrification settling tank of a sewage plant through the sewage conveying pipeline 15, and in the DAMO-Anammox reactor 9, the DAMO archaea uses soluble methane as an electron donor and nitrate nitrogen as an electron acceptor to generate nitrite nitrogen, and then the Anamox bacteria use ammonia nitrogen as the electron donor and nitrite nitrogen as the electron acceptor to generate nitrogen and a small amount of nitrate nitrogen which is used by the DAMO archaea;
in addition, the DAMO bacteria can also use nitrite nitrogen as an electron acceptor, methane as an electron donor to generate nitrogen, but the competitiveness of the DAMO bacteria on the nitrite nitrogen is weaker than that of Anammox bacteria, ammonia nitrogen is completely removed through a series of reactions, soluble methane is also consumed, and the generated nitrogen is discharged into a gas storage tank 7 through a gas conveying pipeline 16;
then the sludge is discharged from the DAMO-Anammox reactor 9 and conveyed to a dehydrator 10, the dehydrator 10 separates the digested sludge into biogas slurry and biogas residues, the water content of the biogas residues is about 60%, and as ammonia nitrogen is removed in the DAMO-Anammox reactor 9 and dissolved methane is consumed, the influence of nitrogen pollution on the environment is greatly reduced, the load of subsequent sewage treatment is reduced, and the dissolved methane is utilized, thereby avoiding the waste of methane energy and reducing the emission of greenhouse gases;
the low-temperature drying system comprises a mesh belt type drying machine 12 and a heat recovery refrigerating unit 11, the heat recovery refrigerating unit 11 is connected with an air outlet of the slurrying tank 1 through a gas conveying pipeline 16, the mesh belt type drying machine 12 is connected with a dewatering machine 10 through a sludge conveying pipeline 14, a circulating fan 18 is arranged between the heat recovery refrigerating unit 11 and the mesh belt type drying machine 12, then biogas slurry enters a sewage plant to be treated, biogas residue is conveyed to the mesh belt type drying machine 12 to be dried at low temperature, the temperature of tail gas generated by the slurrying tank 1 is about 90 ℃, the tail gas is conveyed to the heat recovery refrigerating unit 11 through the gas conveying pipeline 16, the heat recovery refrigerating unit 11 adopts the air source heat pump principle to carry out heat recovery-heat pump dehumidification-heating temperature rise on the tail gas, heat energy is recycled, the loss of heat in tail gas of the slurrying tank is avoided, economy and high efficiency are achieved, and the humidity generated by drying the biogas residue through the circulating fan 18 between the heat recovery refrigerating unit 11 and the mesh belt type drying machine 12 is also achieved The hot air is subjected to heat recovery, heat pump dehumidification and heating temperature rise, so that the hot air and heat energy are recycled, the energy-saving effect is remarkable, the temperature of the hot air of the mesh belt type drier is 60-75 ℃, and the moisture content of the dried biogas residue is below 40%.
The working principle of the invention is as follows: preheating wet sludge by a pulping tank 1 for pulping, then enabling the sludge to enter a thermal hydrolysis tank 2 through a sludge conveying pipeline 14 for high-temperature high-pressure hydrolysis, simultaneously maintaining the pressure in the tank body at 0.4-0.8MPa and the temperature at 160-180 ℃, and then enabling the sludge to enter a flash tank 3 through the sludge conveying pipeline 14, keeping the pressure of the flash tank 3 at 0.1-0.3 MPa and the temperature at 110 ℃, so that after the sludge is subjected to high-temperature high-pressure hydrolysis by the thermal hydrolysis tank 2 and spray explosion by the flash tank 3, the dispersity of sludge particles and the fluidity of the sludge are improved, pathogenic bacteria are killed, and the sludge is stabilized;
then the sludge in the flash tank 3 enters a heat exchanger 4 through a sludge conveying pipeline 14 to be cooled, the temperature is reduced from 110 ℃ to 30-35 ℃, the sludge enters an anaerobic digestion tank 8 through the sludge conveying pipeline 14 to be subjected to anaerobic fermentation to generate biogas, the sludge is fully mixed with microorganisms, the temperature is maintained at 30-35 ℃, and the sludge is discharged from the anaerobic digestion tank 8 after fermentation for 15-20 days;
the discharged sludge is conveyed into a DAMO-Anammox reactor 9 through a sludge conveying pipeline 14, sludge components are fully and uniformly mixed through the DAMO-Anammox reactor 9, the temperature is maintained at 30-35 ℃, then nitrate nitrogen is conveyed into the DAMO-Anammox reactor 9 from a water storage tank 5 through a metering pump 19 for reaction, and nitrogen generated by the reaction is discharged into a gas storage tank 7 through a gas conveying pipeline 16;
then the sludge is discharged from the DAMO-Anammox reactor 9 and conveyed to a dehydrator 10, the digested sludge is separated into biogas slurry and biogas residues through the dehydrator 10, the biogas slurry enters a sewage plant for treatment, and the biogas residues are conveyed to a mesh belt type drier 12 for low-temperature drying.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.

Claims (10)

1. The utility model provides a clean efficient sewage plant mud source processing system which characterized in that: including mud pyrohydrolysis system, mud anaerobic digestion system, DAMO-Anamox reaction system, low temperature mummification system, gas holder (7), water storage tank (5), hydroextractor (10) and steam boiler (6), mud pyrohydrolysis system is connected with steam boiler (6) and mud anaerobic digestion system, mud anaerobic digestion system is connected with gas holder (7), the gas outlet of gas holder (7) passes through gas conveying pipeline (16) and is connected with steam boiler (6) air inlet, DAMO-Anamox reaction system is connected with mud anaerobic digestion system, gas holder (7), hydroextractor (10) and water storage tank (5), the water inlet of water storage tank (5) passes through sewage conveying pipeline (15) and is connected with the delivery port of sewage plant nitration sedimentation tank, low temperature mummification system is connected with mud pyrohydrolysis system and hydroextractor (10), the dehydrator (10) is connected with the nitrification settling tank of the sewage plant through a sewage conveying pipeline (15).
2. The clean and efficient sewage plant sludge source treatment system of claim 1, wherein: the sludge pyrohydrolysis system comprises a slurrying tank (1), a pyrohydrolysis tank (2) and a flash tank (3), wherein the slurrying tank (1), the pyrohydrolysis tank (2) and the flash tank (3) are sequentially communicated through a sludge conveying pipeline (14), the pyrohydrolysis tank (2) and the flash tank (3) are connected with the slurrying tank (1) through a waste steam pipeline (17), and the pyrohydrolysis tank (2) is connected with an air outlet of a steam boiler (6) through a steam pipeline (13).
3. The clean and efficient sewage plant sludge source treatment system of claim 2, wherein: the sludge anaerobic digestion system comprises an anaerobic digestion tank (8) and a heat exchanger (4), wherein the flash tank (3), the heat exchanger (4) and the anaerobic digestion tank (8) are connected through a sludge conveying pipeline (14) in sequence, and a gas outlet of the anaerobic digestion tank (8) is connected with a gas inlet of a gas storage tank (7) through a gas conveying pipeline (16).
4. The clean and efficient sewage plant sludge source treatment system of claim 3, wherein: the anaerobic digestion tank (8) is of a cone structure with a wide upper part and a narrow lower part, the anaerobic digestion tank (8) adopts a complete mixing type reactor, and a stirrer is arranged in the reactor.
5. The clean and efficient sewage plant sludge source treatment system of claim 1, wherein: the DAMO-Anammox reaction system comprises a DAMO-Anammox reactor (9), wherein the DAMO-Anammox reactor (9) is connected with an anaerobic digestion tank (8) through a sludge conveying pipeline (14), an air outlet of the DAMO-Anammox reactor (9) is connected with an air inlet of an air storage tank (7) through a gas conveying pipeline (16), a water inlet of the DAMO-Anammox reactor (9) is connected with a water outlet of a water storage tank (5) through a sewage conveying pipeline (15), and the DAMO-Anammox reactor (9) is connected with a dehydrator (10) through the sludge conveying pipeline (14).
6. The clean and efficient sewage plant sludge source treatment system of claim 5, wherein: the DAMO-Anammox reactor (9) is of a cone structure with a wide upper part and a narrow lower part, the DAMO-Anammox reactor (9) adopts a complete mixing type reactor, and a stirrer is arranged in the reactor.
7. The clean and efficient sewage plant sludge source treatment system of claim 5, wherein: and a metering pump (19) is arranged on a sewage conveying pipeline (15) between the water storage tank (5) and the DAMO-Anammox reactor (9).
8. The clean and efficient sewage plant sludge source treatment system of claim 1, wherein: the low temperature mummification system includes guipure mummification machine (12) and heat recovery refrigerating unit (11), heat recovery refrigerating unit (11) are connected with the gas outlet of slurrying jar (1) through gas transmission pipeline (16), guipure mummification machine (12) are connected with hydroextractor (10) through mud pipeline (14).
9. The clean and efficient sewage plant sludge source treatment system of claim 8, wherein: and a circulating fan (18) is arranged between the heat recovery refrigerating unit (11) and the mesh belt type drying machine (12).
10. A method for treating a clean and efficient sewage plant sludge source treatment system according to any one of claims 1 to 9, characterized in that: comprises the following steps;
s1, preheating and slurrying wet sludge through a slurrying tank (1), then enabling the sludge to enter a thermal hydrolysis tank (2) through a sludge conveying pipeline (14) for high-temperature high-pressure hydrolysis, simultaneously maintaining the pressure in the tank body at 0.4-0.8MPa and the temperature at 160-180 ℃ for 30-50 minutes, then enabling the sludge to enter a flash tank (3) through the sludge conveying pipeline (14), keeping the pressure of the flash tank (3) at 0.1-0.3 MPa and the temperature at 110 ℃, and enabling the sludge to be subjected to high-temperature high-pressure hydrolysis in the thermal hydrolysis tank (2) and spray explosion in the flash tank (3), so that the dispersity of sludge particles and the fluidity of the sludge are improved, pathogenic bacteria are killed, and the sludge is more stabilized;
s2, cooling the sludge in the flash tank (3) in a heat exchanger (4) through a sludge conveying pipeline (14), cooling the temperature from 110 ℃ to 30-35 ℃, allowing the sludge to enter an anaerobic digestion tank (8) through the sludge conveying pipeline (14) for anaerobic fermentation to generate biogas, fully mixing the sludge with microorganisms, keeping the temperature at 30-35 ℃, and discharging the sludge from the anaerobic digestion tank (8) after fermenting for 15-20 days;
s3, conveying the discharged sludge into a DAMO-Anammox reactor (9) through a sludge conveying pipeline (14), fully and uniformly mixing sludge components through the DAMO-Anammox reactor (9), maintaining the temperature at 30-35 ℃, then conveying nitrate nitrogen into the DAMO-Anammox reactor (9) for reaction through a metering pump (19) from a water storage tank (5), and discharging nitrogen generated by the reaction into a gas storage tank (7) through a gas conveying pipeline (16);
s4, discharging the sludge from the DAMO-Anammox reactor (9), conveying the sludge to a dehydrator (10), separating the digested sludge into biogas slurry and biogas residues through the dehydrator (10), treating the biogas slurry in a sewage plant, and conveying the biogas residues to a mesh belt type drier (12) for low-temperature drying.
CN202111185607.8A 2021-10-12 2021-10-12 Clean and efficient sewage plant sludge source treatment system and method Pending CN113620552A (en)

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CN103833186A (en) * 2014-03-10 2014-06-04 北京工业大学 Method for treating sludge digestive liquid by coupling anaerobic ammonia oxidation and anaerobic methane oxidation
CN104150729A (en) * 2014-08-29 2014-11-19 凤阳海泰科能源环境管理服务有限公司 System and method for treating sludge with efficient recycling and low pollution emission
CN111333304A (en) * 2020-03-09 2020-06-26 中国环境保护集团有限公司 Integrated treatment method and system for sludge
CN112607982A (en) * 2020-12-16 2021-04-06 湖南军信环保股份有限公司 Sludge pyrohydrolysis system and sludge anaerobic digestion system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103274523A (en) * 2013-05-22 2013-09-04 北京工业大学 Device and method for realizing synchronous anaerobic ammonia oxidation and denitrification anaerobic methane oxidation
CN103833186A (en) * 2014-03-10 2014-06-04 北京工业大学 Method for treating sludge digestive liquid by coupling anaerobic ammonia oxidation and anaerobic methane oxidation
CN104150729A (en) * 2014-08-29 2014-11-19 凤阳海泰科能源环境管理服务有限公司 System and method for treating sludge with efficient recycling and low pollution emission
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