CN111233290A - Sludge treatment system for sewage treatment plant - Google Patents
Sludge treatment system for sewage treatment plant Download PDFInfo
- Publication number
- CN111233290A CN111233290A CN202010076200.0A CN202010076200A CN111233290A CN 111233290 A CN111233290 A CN 111233290A CN 202010076200 A CN202010076200 A CN 202010076200A CN 111233290 A CN111233290 A CN 111233290A
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- Prior art keywords
- sludge
- tank
- anaerobic fermentation
- pipeline
- fermentation tank
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Classifications
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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
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/12—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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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
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- 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
Abstract
The invention discloses a sludge treatment system for a sewage treatment plant, which comprises a sludge concentration tank, wherein the sludge concentration tank is divided into a tank A and a tank B, and the tank A is a sludge incinerator through a pipeline; the pool B is sequentially connected with the anaerobic fermentation tank through a pipeline, a part of steam of the sludge incinerator is conveyed to the heat exchanger through a pipeline, and low-temperature liquid of the heat exchanger is circularly communicated with an interlayer of the anaerobic fermentation tank and a pipeline of the solar heat collection device through pipelines; the gas outlet of the anaerobic fermentation tank is connected to the cogeneration device through a pipeline, the other part of steam of the sludge incinerator is conveyed to the cogeneration device through a pipeline, and the cogeneration device is electrically connected with the power output device. The invention can treat a large amount of excess sludge, biomass energy in the sludge can be used for power generation, and the residue after sludge treatment is used as a fertilizer, thereby realizing the purposes of sludge reduction, stabilization and recycling.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a sludge treatment system for a sewage treatment plant.
Background
In recent years, the number and the treatment capacity of municipal sewage treatment plants in China are rapidly increased, but the problems of higher operation cost generally exist, wherein the electricity consumption is mainly high and generally accounts for about 50 percent of the whole operation cost.
Because the phenomenon of 'heavy water and light sludge' exists in China for a long time, the attention degree on sludge treatment is not enough, and a large amount of sludge is not subjected to stabilization treatment, so that the environment pollution is caused, and the health of human beings is harmed. How to reasonably dispose the sludge and economically and effectively realize the reduction, harmlessness and reclamation of the sludge is an important subject facing governments, enterprises and environmental protection workers of various countries in the world. The construction and operation of sewage treatment plants are accompanied by a large amount of excess sludge, and the total sludge yield in the country can quickly break through 3000 million tons in terms of 80 percent of water content. According to prediction, the sludge yield can break through 6000 million tons in the year by 2020.
With the attention of governments and citizens on environmental protection, people begin to pay attention to the potential of biomass energy, sewage treatment plants generate a large amount of sludge every day, the sludge contains organic matters, macromolecular organic matters are decomposed into stable substances under the action of anaerobic microorganisms, the volume of the sludge can be reduced greatly compared with that of the sludge before digestion, and meanwhile methane mainly can be obtained. The residue after anaerobic digestion still contains nutrients, can be used as a fertilizer or a soil conditioner, can be recycled to the maximum extent, and achieves the aims of reduction, stabilization and recycling. However, how to utilize renewable resources of sewage treatment plants to realize high-efficiency power generation is a technical problem in the field.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a sludge treatment system for a sewage treatment plant, which can treat a large amount of excess sludge, wherein biomass energy in the sludge can be used for power generation, and residues after sludge treatment are used as fertilizers, so that the aims of sludge reduction, stabilization and recycling are fulfilled.
The technical problem to be solved by the invention is realized by the technical scheme, which comprises a sludge concentration tank, a solar heat collection device, a heat exchanger, an anaerobic fermentation tank and a cogeneration device, wherein the sludge concentration tank is divided into a tank A and a tank B, and the tank A is sequentially connected with a plate-and-frame filter press, a sludge drying room and a sludge incinerator through pipelines; the tank B is sequentially connected with an anaerobic fermentation tank, a biogas slurry and residue collector and a separator through pipelines; part of steam of the sludge incinerator is conveyed to the heat exchanger through a pipeline, and low-temperature liquid of the heat exchanger is circularly communicated with an interlayer of the anaerobic fermentation tank and a pipeline of the solar heat collection device through pipelines; an air outlet of the anaerobic fermentation tank is sequentially communicated with the air storage chamber, the methane desulfurizer, the methane purifier and the methane compressor through pipelines to be connected to a gas turbine of the cogeneration device, the other part of steam of the sludge incinerator is conveyed to a steam turbine generator of the cogeneration device through a pipeline, and the cogeneration device is electrically connected with the power output device.
Compared with the prior art, the invention has the technical effects that:
can treat a large amount of excess sludge of a sewage treatment plant, and supply energy generated by biomass energy to a plate-and-frame filter press so as to realize the purpose of treating waste by waste; the invention realizes the simultaneous treatment of sludge and odor of a sewage treatment plant, has high treatment efficiency, saves energy and protects environment, and greatly reduces the treatment and discharge pressure of excess sludge; the biogas generated by anaerobic digestion of the sludge not only meets the energy required by self fermentation, but also can be supplied to a cogeneration device; in addition, the biogas slurry and the biogas residues generated by anaerobic digestion of the sludge are fermented to kill pathogenic bacteria and parasitic ova and can be used as organic agricultural fertilizers; the energy generated by the sludge drying incineration can be supplied to a heat exchanger and a cogeneration device, and the aims of 'reduction', 'stabilization' and 'resource' of the residual sludge are fulfilled.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a technical roadmap for one embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention;
fig. 3 is a schematic structural view of the cogeneration apparatus in fig. 2.
In the figure, 1, a sludge concentration tank; 2. a plate-and-frame filter press; 3. a sludge drying room; 4. a sludge incinerator; 5. a solar heat collection device; 6. a heat exchanger; 7. anaerobic fermentation tank; 8. an air storage chamber; 9. a biogas desulfurizer; 10. a biogas purifier; 11. a methane compressor; 12. a gas turbine; 13. a motor; 14. a smoke exhauster; 15. a waste heat boiler; 16. a steam turbine generator; 17. a power output device; 18. a biogas slurry and residue collector; 19. a separator; 20. a cogeneration unit.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in figure 1, the technical route of the invention is that the whole system is divided into a sludge recycling module and a biomass power generation and supply module: the sludge recycling module comprises a sludge concentration tank, the sludge concentration tank is sequentially connected with a plate-and-frame filter press, a sludge drying room and a sludge incinerator through one pipeline, and is sequentially connected with an anaerobic fermentation tank, a biogas slurry and biogas residue collector and a separator through another pipeline, and the heat exchanger and the solar heat collection device are connected with the anaerobic fermentation tank to provide heat required by fermentation for the fermentation tank. The biomass power generation and supply module comprises a gas storage chamber, a methane desulfurizer, a methane purifier, a methane compressor, a heat exchanger, a cogeneration device and a storage battery.
The sludge concentration tank is divided into a tank A and a tank B by a retaining wall, wherein the sludge in the tank A accounts for 30%, and the sludge in the tank B accounts for 70%. The sludge concentration tank A is connected with the plate-and-frame filter press through a pipeline, and the sludge anaerobic fermentation tank is connected with the sludge concentration tank B through a pipeline; and (3) after the residual sludge in the sludge concentration tank A is subjected to filter pressing and dehydration by a plate-and-frame filter press, the residual sludge enters a rotary drum type dryer of a sludge drying room, the sludge is fully contacted with hot air flow under the stirring of a rotary drum frying plate, the water content of the sludge is controlled to be below 40 percent, the sludge is conveyed to a sludge incinerator, and the heat generated by incineration is supplied to a heat exchanger and a cogeneration system. The sludge concentration tank B is connected with the anaerobic fermentation tank, biogas generated by the anaerobic fermentation tank enters the gas storage chamber for storage, the biogas is conveyed into the biogas desulfurizer for desulfurization through a high-pressure washing process, purified by the biogas purifier and compressed by the methane compressor, and finally conveyed to the cogeneration device for power generation. Meanwhile, biogas slurry and biogas residues in the anaerobic fermentation tank are collected by a collector, and liquid fertilizer and biogas residues are separated by a separator.
The tank B is filled with mixed sludge with C/N of 10-20: 1 which is formed by mixing excess sludge of a sewage treatment plant and a small amount of landfill leachate in proportion; adding 50-150 mg/gVS Fe into the mixed sludge3O4And 30-50 mg/gVS ZVI (zero-valent iron), so that the hydrolysis of organic matters in the sludge is promoted, the oxidation-reduction potential of a subsequent fermentation system is reduced, and the conductive material can be used for promoting an interspecific electron transfer process between acetogenic microorganisms and methanogenic bacteria; the diameter of the ZVI (zero-valent iron) is about 0.15mm, and the purity is more than 80%; said Fe3O4The diameter is about 0.15mm and the purity is greater than 62% calculated as iron.
Anaerobic fermentation tankAdopt double-deck egg type structure, egg type structure atress condition is good, stirs simultaneously and fully does not have the dead angle, and mud is difficult for consolidating at the bottom of the pool, and the pool total surface is cylindrical little, and heat radiating area is little easily keeps warm. The interlayer of the double-layer egg-shaped anaerobic fermentation tank is filled with heating and heat-preserving water. When the double-layer egg type anaerobic fermentation tank adopts medium-temperature fermentation, the organic load is generally 1.6-6.4 kgVSS/(m)3And d) about, the hydraulic retention time is longer, and the retention time is 10-15 d. The double-layer egg-shaped anaerobic fermentation tank adopts a solar heat collection device and a heat exchanger to provide heat required by medium-temperature fermentation.
The solar heat collector consists of a full glass mirror reflector, a solar heat collecting plate, a temperature sensor and the like. The solar heat collecting device absorbs heat and conveys the heat to the interlayer of the double-layer egg-shaped fermentation tank to adjust the temperature, thereby ensuring the normal gas production under the condition of low outside air temperature. The condenser adopts the reflection of an all-glass mirror reflector, and has higher optical efficiency. The solar heat collecting device adopts forced circulation, the photo-thermal efficiency is high, and the system efficiency can reach 60-80%.
The heat generated by the sludge incinerator is used for boiling water, 5-10% of steam is supplied to the heat exchanger, and 90-95% of steam is supplied to the cogeneration device.
The cogeneration device comprises a gas turbine, a generator, a smoke exhauster, a waste heat boiler and a steam turbine generator. The gas inlet of the gas turbine is connected with the gas outlet of the methane compressor through a pipeline. The compressed methane and air enter a gas turbine, are mixed and combusted in a combustion chamber, and then are expanded in the turbine to drive an impeller to rotate, so that the impeller drives a generator to generate electricity. The tail gas temperature of the gas turbine is very high (generally above 500 ℃), the tail gas is an excellent driving heat source, the high-temperature tail gas is exhausted by a smoke exhauster and then is subjected to waste heat recovery, steam is generated by a waste heat boiler, and the steam is enabled to continue to do work in a steam turbine generator for power generation. The steam generated by the sludge incinerator also enters the steam turbine generator to do work and generate electricity. The total heat efficiency of the cogeneration device can reach 75 to 82 percent.
The heat and power cogeneration device is connected with the power output device, and the generated electric energy is supplied to a power grid or an electric appliance through the power output device to provide required electric power for the plate-and-frame filter press, the garden lighting system, the odor absorption treatment device and the like.
As shown in fig. 2, the present embodiment includes a sludge concentration tank 1, a solar heat collection device 5, a heat exchanger 6, an anaerobic fermentation tank 7 and a cogeneration device 20, wherein the sludge concentration tank 1 is divided into a tank a and a tank B, and the tank a is connected with a plate-and-frame filter press 2, a sludge drying room 3 and a sludge incinerator 4 in sequence through a pipeline; the tank B is sequentially connected with an anaerobic fermentation tank 7, a biogas slurry and residue collector 18 and a separator 19 through pipelines; a part of steam of the sludge incinerator 4 is conveyed to a heat exchanger 6 through a pipeline, and low-temperature liquid of the heat exchanger 6 is circularly communicated with an interlayer of the anaerobic fermentation tank 7 and a pipeline of the solar heat collection device 5 through pipelines; an air outlet of the anaerobic fermentation tank 7 is sequentially communicated with an air storage chamber 8, a methane desulfurizer 9, a methane purifier 10 and a methane compressor 11 through pipelines, air is supplied to a gas turbine 12 of the cogeneration device 20, the other part of steam of the sludge incinerator 4 is conveyed to a steam turbine generator 16 of the cogeneration device 20 through a pipeline, and the cogeneration device 20 is electrically connected with an electric power output device 17.
The anaerobic fermentation tank 7 is of a double-layer egg-shaped structure, and the middle interlayer of the anaerobic fermentation tank 7 is filled with heating and heat-preserving water.
As shown in fig. 3, the cogeneration device 20 includes a gas turbine 12, a generator 13, an extractor 14, a waste heat boiler 15 and a steam turbine generator 16, wherein a rotating shaft of the gas turbine is connected with a main shaft of the generator 13, an exhaust port of the gas turbine 12 is communicated with the extractor 14, the extractor 14 is connected to the waste heat boiler 15, and steam of the waste heat boiler 15 is sent to the steam turbine generator 16 through a pipeline.
Claims (3)
1. A sludge treatment system for sewage treatment plant, characterized by: the system comprises a sludge concentration tank (1), a solar heat collection device (5), a heat exchanger (6), an anaerobic fermentation tank (7) and a cogeneration device (20), wherein the sludge concentration tank (1) is divided into a tank A and a tank B, and the tank A is sequentially connected with a plate-and-frame filter press (2), a sludge drying room (3) and a sludge incinerator (4) through pipelines; the tank B is sequentially connected with an anaerobic fermentation tank (7), a biogas slurry and residue collector (18) and a separator (19) through pipelines; a part of steam of the sludge incinerator (4) is conveyed to the heat exchanger (6) through a pipeline, and low-temperature liquid of the heat exchanger (6) is circularly communicated with an interlayer of the anaerobic fermentation tank (7) and a pipeline of the solar heat collection device (5) through pipelines; an air outlet of the anaerobic fermentation tank (7) is sequentially communicated with the gas storage chamber (8), the methane desulfurizer (9), the methane purifier (10) and the methane compressor (11) through pipelines to be connected to a gas turbine (12) of the cogeneration device (20), the other part of steam of the sludge incinerator (4) is conveyed to a steam turbine generator (16) of the cogeneration device (20) through pipelines, and the cogeneration device (20) is electrically connected with the power output device (17).
2. The sludge treatment system for a sewage treatment plant according to claim 1, wherein: the anaerobic fermentation tank (7) is of a double-layer egg-shaped structure, and the middle interlayer of the anaerobic fermentation tank (7) is filled with heating and heat-preserving water.
3. The sludge treatment system for a sewage treatment plant according to claim 1 or 2, wherein: the cogeneration device (20) comprises a gas turbine (12), a generator (13), a smoke exhauster (14), a waste heat boiler (15) and a steam turbine generator (16), wherein a rotating shaft of the gas turbine is connected with a main shaft of the generator (13), an exhaust port of the gas turbine (12) is communicated with the smoke exhauster (14), the smoke exhauster (14) is connected to the waste heat boiler (15), and steam of the waste heat boiler (15) is sent to the steam turbine generator (16) through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010076200.0A CN111233290A (en) | 2020-01-23 | 2020-01-23 | Sludge treatment system for sewage treatment plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010076200.0A CN111233290A (en) | 2020-01-23 | 2020-01-23 | Sludge treatment system for sewage treatment plant |
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| CN111233290A true CN111233290A (en) | 2020-06-05 |
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| CN202010076200.0A Pending CN111233290A (en) | 2020-01-23 | 2020-01-23 | Sludge treatment system for sewage treatment plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112344350A (en) * | 2020-10-30 | 2021-02-09 | 上海市政工程设计研究总院（集团）有限公司 | Sludge reduction treatment system and method |
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