CN110877953A - Reaction system for sludge resource utilization - Google Patents

Reaction system for sludge resource utilization Download PDF

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Publication number
CN110877953A
CN110877953A CN201911343319.3A CN201911343319A CN110877953A CN 110877953 A CN110877953 A CN 110877953A CN 201911343319 A CN201911343319 A CN 201911343319A CN 110877953 A CN110877953 A CN 110877953A
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polyhydroxyalkanoate
communicated
fermentation
reaction
tank
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Inventor
蒋勇
李魁晓
贺赟
王佳伟
常菁
李伟
姜大伟
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Beijing Drainage Group Co Ltd
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Beijing Drainage Group Co Ltd
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Priority to CN201911343319.3A priority Critical patent/CN110877953A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/10Treatment of sludge; Devices therefor by pyrolysis
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G24/00Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/20Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/02Biological treatment
    • C02F11/04Anaerobic treatment; Production of methane by such processes
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00Constructional details, e.g. recesses, hinges
    • C12M23/02Form or structure of the vessel
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/12Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/26Means for regulation, monitoring, measurement or control, e.g. flow regulation of pH
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/30Means for regulation, monitoring, measurement or control, e.g. flow regulation of concentration
    • C12M41/34Means for regulation, monitoring, measurement or control, e.g. flow regulation of concentration of gas
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12MAPPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/42Means for regulation, monitoring, measurement or control, e.g. flow regulation of agitation speed

Abstract

The invention belongs to the technical field of sludge treatment, and relates to a reaction system for sludge resource utilization. The reaction system comprises: the system comprises a thermal hydrolysis system, an anaerobic fermentation system, a solid-liquid separation system, an acidification filtrate collection system, a mud cake processing nutrient soil system, a biological pond of a sewage treatment plant, a PHAs synthetic fermentation system, a PHAs collection and extraction system and a PHAs drying system; the thermal hydrolysis system, the anaerobic fermentation system and the solid-liquid separation system are sequentially communicated in series; the solid-liquid separation system is communicated with the mud cake processing nutrient soil system and the acidized filtrate collection system in parallel; the acidification filtrate collecting system is communicated with a biological pond of a sewage treatment plant and a PHAs synthetic fermentation system in parallel; the PHAs synthetic fermentation system, the PHAs collecting and extracting system and the PHAs drying system are communicated in sequence. The reaction system improves the resource utilization rate of the sludge.

Description

Reaction system for sludge resource utilization
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a reaction system for sludge resource utilization.
Background
Along with the faster and faster urbanization process, the production amount and the treatment amount of urban domestic sewage are increased. Although various methods have been taken to reduce the production of municipal sludge, the total amount of municipal sludge has increased at a rate of 10% per year.
Sludge treatment is a process of carrying out reduction, stabilization and harmless treatment on sludge. The higher the degree of wastewater treatment, the more sludge residue will be produced to be treated. In addition to treating sewage using land or sewage ponds, a general sewage treatment plant must be provided with sludge treatment facilities. Sludge in sewage treatment plants is generally treated by adopting an anaerobic digestion-dosing dehydration method. And (3) adding chemicals into the sludge subjected to anaerobic digestion for dehydration to enable the water content of the sludge to reach about 80%, and then transporting the sludge to a sanitary landfill for landfill. However, the sludge with the water content of 80 percent still has certain fluidity, which brings inconvenience to the operations of transportation, landfill and the like and has the hidden trouble of secondary pollution. With the national enhancement of municipal sludge final disposal management, sludge treatment and disposal has become a very complex and costly part of the operation of sewage treatment systems.
The existing sludge treatment methods mainly comprise three methods: incineration, landfill and resource utilization. The sludge is treated by adopting an incineration process in foreign countries. The incineration process has huge investment and is easy to cause atmospheric pollution. The sludge is mostly treated by landfill in China. The landfill sludge needs to occupy a large amount of land, can cause secondary environmental pollution and is not beneficial to the long-term development of ecological environment. The resource utilization mainly shows that the sludge is prepared into organic fertilizer or reused. The microbial sludge treatment has wide prospect, and the sludge is fermented into organic fertilizer and is prepared into methane by anaerobic digestion of the sludge by using the existing sludge resource utilization technology. However, the organic fertilizer obtained by fermenting sludge by the current composting method only utilizes part of organic matters in the sludge, and the popularization of the organic fertilizer is limited because the sludge contains part of pathogenic bacteria. The technology for preparing the biogas by sludge fermentation is relatively mature and economical, but the biogas yield is low. Studies have shown that 1 ton of biomass produced from sludge can produce acetic acid worth $ 150, but only $ 31 methane.
Patent document CN109467302A discloses a method for resource utilization of municipal sludge. The method sequentially comprises the following steps: adding sludge into a stirring barrel, adding clear water in a certain proportion to dilute the sludge to enable the water content of the sludge to reach more than 90%, then adding a medicament A, and fully mixing and stirring, wherein the medicament A is formed by compounding a polymeric flocculant and inorganic salt; feeding the sludge into an integrated belt type filter press, feeding the sludge added with flocculant into the filter press, and performing filter pressing to obtain loose sludge cakes; stacking loose sludge cakes at a ventilation position at room temperature, naturally drying the loose sludge cakes until the water content is 60-65%, adding fermentation probiotics, an organic carbon source and a nitrogen source, fully mixing and stirring, and performing three-stage fermentation until organic nutrient soil with the water content of 25-35% is obtained. The method does not further treat the filtrate generated after filter pressing and utilize resources.
Patent document CN110092557A discloses a sludge resource utilization treatment system. The processing system comprises: a preliminary dehydration unit adapted to preliminarily dehydrate the sludge and press the sludge into a cake shape; the ultrasonic dehydration unit is provided with a sludge feeding hole and a sludge discharging hole, the sludge feeding hole is connected with the preliminary dehydration unit, and the ultrasonic dehydration unit is suitable for performing ultrasonic dehydration on the preliminarily dehydrated sludge so as to realize deep dehydration; a drying unit adapted to dry sludge; the sludge pyrolysis unit is provided with a carbonization feeding hole and a carbonization discharging hole, is connected with the ultrasonic dehydration unit, and is suitable for pyrolyzing the fully dehydrated sludge so as to obtain semicoke; the gas-liquid separation unit is connected with the sludge pyrolysis activation unit and is suitable for carrying out gas-liquid separation on the pyrolysis gas so as to obtain gas and tar; the sludge activation units are respectively connected with the carbonization discharge ports and are suitable for supplying the semicoke to the activation units so that the semicoke is activated to obtain sludge activated carbon; the acid cleaning unit is provided with an acid liquor inlet, an activated carbon feeding hole and a material outlet, the acid cleaning unit is connected with the sludge pyrolysis activation unit, and the acid cleaning unit is suitable for reacting with inorganic substances in the sludge activated carbon, so that the ash content in the sludge activated carbon is reduced, and the proportion of the fixed carbon content is increased. The treatment system firstly carries out primary dehydration and deep dehydration on the sludge, further treats the dehydrated sludge to prepare sludge activated carbon, and does not further treat filtrate generated after dehydration and utilize resources.
Therefore, a treatment system for improving the resource utilization of sludge is needed.
Disclosure of Invention
The invention aims to provide a reaction system for sludge resource utilization, so as to improve the sludge resource utilization.
In order to achieve the above object, the present invention provides a reaction system for resource utilization of sludge, comprising: the system comprises a thermal hydrolysis system, an anaerobic fermentation system, a solid-liquid separation system, an acidification filtrate collection system, a mud cake processing nutrient soil system, a biological pool of a sewage treatment plant, a polyhydroxyalkanoate synthesis fermentation system, a polyhydroxyalkanoate collection and extraction system and a polyhydroxyalkanoate drying system;
the thermal hydrolysis system, the anaerobic fermentation system and the solid-liquid separation system are sequentially communicated in series;
the solid-liquid separation system is communicated with the mud cake processing nutrient soil system and the acidized filtrate collection system in parallel;
the acidification filtrate collecting system is communicated with a biological pool of the sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system in parallel;
the polyhydroxyalkanoate synthesis fermentation system, the polyhydroxyalkanoate collection and extraction system and the polyhydroxyalkanoate drying system are communicated in sequence.
Preferably, the bottom of the biological pond of the sewage treatment plant is communicated with the anaerobic fermentation system.
Preferably, the reaction system further comprises a nitrogen and phosphorus recovery system;
the solid-liquid separation system is communicated with the nitrogen and phosphorus recovery system and then communicated with the acidified filtrate collection system;
or the acidification filtrate collecting system is communicated with the nitrogen and phosphorus recovery system and then communicated with the biological pond of the sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system in parallel.
Preferably, the thermal hydrolysis system comprises: a thermal hydrolysis reaction tank, a steam generator and a flash tank; the steam generator and the flash tank are respectively communicated with the thermal hydrolysis reaction tank; the pyrohydrolysis reaction tank is provided with a first temperature control unit;
the anaerobic fermentation system comprises: the anaerobic reactor and a gas collecting and treating device communicated with the anaerobic reactor; the anaerobic reactor is provided with a first pH sensor, a first stirring unit and a second temperature control unit;
the mud cake processing nutrient soil system comprises: an anaerobic reaction tank; the anaerobic reaction tank is provided with a second pH sensor, a second stirring unit and a third temperature control unit;
the polyhydroxyalkanoate synthesis fermentation system comprises: an aerobic fermentation tank; the aerobic fermentation tank is provided with a dissolved oxygen control unit, a third pH sensor, a fourth temperature control unit and a third stirring unit;
the flash tank is communicated with the anaerobic reactor;
the solid-liquid separation system is communicated with the anaerobic reaction tank;
the acidification filtrate collecting system is communicated with the aerobic fermentation tank.
More preferably, a draught fan is arranged on a pipeline communicating the anaerobic reactor with the gas collecting and treating device;
a microbial filler is arranged in the gas collecting and processing device;
the dissolved oxygen control unit includes: air generator, air filter, dissolved oxygen sensor.
Preferably, the reaction system further comprises a PLC control system; the PLC control system controls the feeding amount, the discharging amount, the feeding time and the discharging time of the thermal hydrolysis system, the anaerobic fermentation system, the solid-liquid separation system, the acidification filtrate collection system, the mud cake processing nutrient soil system, the nitrogen and phosphorus recovery system, the biological pond of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system, the polyhydroxyalkanoate collection and extraction system and the polyhydroxyalkanoate drying system.
More preferably, the feeding ends of the thermal hydrolysis system, the anaerobic fermentation system, the solid-liquid separation system, the acidified filtrate collection system, the sludge cake processing nutrient soil system, the nitrogen and phosphorus recovery system, the biological pond of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system, the polyhydroxyalkanoate collection and extraction system and the polyhydroxyalkanoate drying system are provided with metering pumps; the PLC control system controls the feeding amount, the discharging amount, the feeding time and the discharging time of the thermal hydrolysis system, the anaerobic fermentation system, the solid-liquid separation system, the acidified filtrate collection system, the mud cake processing nutrient soil system, the nitrogen and phosphorus recovery system, the biological pond of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system, the polyhydroxyalkanoate collection and extraction system and the polyhydroxyalkanoate drying system by controlling the flow and the running time of the metering pump.
More preferably, the reaction system further comprises: a PLC control system; the PLC control system is in signal connection with the first temperature control unit, the first pH sensor, the first stirring unit, the second temperature control unit, the second pH sensor, the second stirring unit, the third temperature control unit, the dissolved oxygen control unit, the third pH sensor, the fourth temperature control unit and the third stirring unit;
the PLC control system adjusts the temperatures in the thermal hydrolysis reaction tank, the anaerobic reactor, the anaerobic reaction tank and the aerobic fermentation tank according to signals of the first temperature control unit, the second temperature control unit, the third temperature control unit and the fourth temperature control unit;
and the PLC control system respectively adjusts the pH values of the materials in the anaerobic reactor, the anaerobic reaction tank and the aerobic fermentation tank according to signals of the first pH sensor, the second pH sensor and the third pH sensor.
More preferably, the PLC control system is in signal connection with the dissolved oxygen control unit, and adjusts the amount of gas entering the aerobic fermentation tank according to the signal of the dissolved oxygen control unit. Furthermore, the PLC control system is in signal connection with the dissolved oxygen sensor in the dissolved oxygen control unit, and adjusts the gas amount entering the aerobic fermentation tank according to the signal of the dissolved oxygen sensor.
In one embodiment of the invention, the solid-liquid separation system comprises at least one of a centrifuge, a plate-and-frame filter press, and a membrane separation device.
In one embodiment of the invention, the acidified filtrate collection system includes a first holding tank having a precipitation function.
In a specific embodiment of the invention, the polyhydroxyalkanoate collection and extraction system comprises a centrifugal device and a crushing device which are communicated in sequence.
In one embodiment of the present invention, the polyhydroxyalkanoate drying system comprises a dryer.
In a specific embodiment of the invention, the nitrogen and phosphorus recovery system comprises a second storage tank with a precipitation function and a magnesium salt adding device; and the magnesium salt adding device is communicated with the second storage tank and is positioned above the second storage tank.
Preferably, the magnesium salt adding device is provided with a liquid level meter; and the PLC control system controls the adding amount of the magnesium salt in the second storage tank according to the signal of the liquid level meter.
According to the reaction system for recycling sludge provided by the invention, sludge, such as municipal sludge and the like, is preferably selected, the thermal hydrolysis treatment is carried out in the thermal hydrolysis system, the disease treatment risk of the reaction system is reduced, a large amount of organic matters are released to be beneficial to carrying out subsequent processes, the sludge after thermal hydrolysis is subjected to anaerobic acidification in the anaerobic fermentation system, solid-liquid separation is carried out by the solid-liquid separation system to obtain acid-producing filtrate and mud cakes, and the mud cakes are made into nutrient soil in the nutrient soil processing system; and (3) allowing part of the acidogenic filtrate to enter a biological pond of a sewage treatment plant as a carbon source after the acidogenic filtrate enters an acidification filtrate collection system, allowing the other part of the acidogenic filtrate to enter a polyhydroxyalkanoate synthesis fermentation system to prepare polyhydroxyalkanoate, and then allowing the polyhydroxyalkanoate collection extraction system and the polyhydroxyalkanoate drying system to obtain an polyhydroxyalkanoate product.
The reaction system for recycling the sludge can recycle the nitrogen and the phosphorus in the acid-producing filtrate through the nitrogen and phosphorus recovery system, and the nitrogen and the phosphorus exist in a struvite form.
According to the reaction system for recycling the sludge, provided by the invention, after the acid-producing filtrate enters the acidification filtrate collection system, a part of the acid-producing filtrate enters the biological pond of the sewage treatment plant for continuous treatment, and the treated sludge enters the anaerobic fermentation system to be mixed with the sludge after the thermal hydrolysis treatment, so that the recycling utilization rate of the sludge is improved.
The reaction system for recycling the sludge provided by the invention can be used for carrying out full-automatic accurate control on the sludge in the treatment process through the PLC control system.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a schematic diagram of a reaction system for resource utilization of sludge provided by the invention.
FIG. 2 is a schematic diagram of another sludge resource utilization reaction system provided by the invention.
FIG. 3 is a schematic diagram of a reaction system for resource utilization of sludge according to the present invention.
Description of the reference numerals
1. A sludge feeding unit;
2. a thermal hydrolysis system;
3. an anaerobic fermentation system;
4. a solid-liquid separation system;
5. an acidified filtrate collection system;
6. a mud cake processing nutrient soil system;
7. a nitrogen and phosphorus recovery system;
8. a biological tank of a sewage treatment plant;
9. a polyhydroxyalkanoate synthesis fermentation system;
10. a polyhydroxyalkanoate collection and extraction system;
11. a polyhydroxyalkanoate drying system;
12. and (4) a PLC control system.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
The invention provides a reaction system for sludge resource utilization. Referring to fig. 1, fig. 1 shows a schematic diagram of a reaction system for resource utilization of sludge according to the present invention. As shown in fig. 1, the reaction system includes: the system comprises a thermal hydrolysis system 2, an anaerobic fermentation system 3, a solid-liquid separation system 4, an acidification filtrate collection system 5, a mud cake processing nutrient soil system 6, a biological pond 8 of a sewage treatment plant, a polyhydroxyalkanoate synthesis fermentation system 9, a polyhydroxyalkanoate collection and extraction system 10 and a polyhydroxyalkanoate drying system 11; the thermal hydrolysis system 2, the anaerobic fermentation system 3 and the solid-liquid separation system 4 are sequentially communicated in series; the solid-liquid separation system 4 is communicated with the mud cake processing nutrient soil system 6 and the acidized filtrate collection system 5 in parallel; the acidification filtrate collecting system 5 is communicated with a biological pool 8 of the sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system 9 in parallel; the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10 and the polyhydroxyalkanoate drying system 11 are sequentially communicated.
The working principle of the reaction system for sludge resource utilization provided by the invention is as follows:
firstly, carrying out thermal hydrolysis treatment on sludge, such as municipal sludge and the like, in a thermal hydrolysis system 2, reducing the disease treatment risk of a reaction system, releasing a large amount of organic matters to facilitate subsequent processes, carrying out anaerobic acidification on the sludge after thermal hydrolysis in an anaerobic fermentation system 3, carrying out solid-liquid separation through a solid-liquid separation system 4 to obtain acid-producing filtrate and mud cakes, and making the mud cakes into nutrient soil in a nutrient soil processing system 6; after the acidogenic filtrate enters an acidification filtrate collecting system 5, one part of the acidogenic filtrate enters a biological pond 8 of a sewage treatment plant as a carbon source, the other part of the acidogenic filtrate enters a polyhydroxyalkanoate synthesis fermentation system 9 to prepare polyhydroxyalkanoate, and then a polyhydroxyalkanoate collecting and extracting system 10 and a polyhydroxyalkanoate drying system 11 are used for obtaining polyhydroxyalkanoate products.
Referring to fig. 2 and fig. 3, the reaction system for recycling sludge provided by the present invention further includes a sludge feeding unit 1, and the sludge feeding unit 1 is communicated with the thermal hydrolysis system 2.
In order to improve the resource utilization rate of the sludge, the bottom of the biological tank 8 of the sewage treatment plant is communicated with the anaerobic fermentation system 3, so that the sludge in the biological tank 8 of the sewage treatment plant enters the anaerobic fermentation system 3 for resource utilization.
In the present invention, the reaction system further comprises a nitrogen and phosphorus recovery system 7. Referring to fig. 2, the solid-liquid separation system 4 is in communication with the nitrogen and phosphorus recovery system 7, and then in communication with the acidified filtrate collection system 5; alternatively, referring to fig. 3, the acidified filtrate collecting system 5 is in parallel communication with the nitrogen and phosphorus recovery system 7, and then in parallel communication with the biological pond 8 of the sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system 9.
The following describes in detail the structure of each system in the reaction system for sludge resource utilization according to the present invention.
The thermal hydrolysis system 2 comprises: a thermal hydrolysis reaction tank, a steam generator and a flash tank; the steam generator and the flash tank are respectively communicated with the thermal hydrolysis reaction tank; the pyrohydrolysis reaction tank is provided with a first temperature control unit.
The anaerobic fermentation system 3 includes: the anaerobic reactor and a gas collecting and treating device communicated with the anaerobic reactor; the anaerobic reactor is provided with a first pH sensor, a first stirring unit and a second temperature control unit. Preferably, a draught fan is arranged on a pipeline communicating the anaerobic reactor with the gas collecting and treating device; a microbial filler is arranged in the gas collecting and processing device; the dissolved oxygen control unit includes: air generator, air filter, dissolved oxygen sensor.
The solid-liquid separation system 4 comprises at least one of a centrifuge, a plate-and-frame filter press and a membrane separation device.
The acidified filtrate collection system 5 comprises a first tank with a precipitation function.
The mud cake processing nutrient soil system 6 comprises: an anaerobic reaction tank; the anaerobic reaction tank is provided with a second pH sensor, a second stirring unit and a third temperature control unit. Adding a carbon source and a nitrogen source into the fermented mud cakes, stirring, then placing the mud cakes in a ventilated place for natural composting and continuing fermentation, and finally obtaining the nutrient soil.
The nitrogen and phosphorus recovery system 7 comprises a second storage tank with a precipitation function and a magnesium salt adding device; and the magnesium salt adding device is communicated with the second storage tank and is positioned above the second storage tank. The magnesium salt feeding device is provided with a liquid level meter.
The polyhydroxyalkanoate synthesis fermentation system 9 includes: an aerobic fermentation tank; the aerobic fermentation tank is provided with a dissolved oxygen control unit, a third pH sensor, a fourth temperature control unit and a third stirring unit.
The polyhydroxyalkanoate collection and extraction system 10 comprises a centrifugal device and a crushing device which are communicated in sequence.
The polyhydroxyalkanoate drying system 11 includes a dryer.
In one embodiment of the invention, the thermal hydrolysis reaction tank, the flash tank and the anaerobic reactor are communicated in sequence; the solid-liquid separation system is communicated with the anaerobic reaction tank and the second storage tank in parallel; the second storage tank, the first storage tank, the aerobic fermentation tank, the centrifugal device, the crushing device and the dryer are communicated in sequence; the anaerobic reaction tank is communicated with the gas collecting and processing device; the first storage tank is also communicated with a biological pond of a sewage treatment plant; the second storage tank is communicated with a magnesium salt feeding device.
In another embodiment of the invention, the thermal hydrolysis reaction tank, the flash tank, the anaerobic reactor and the solid-liquid separation system are communicated in sequence; the solid-liquid separation system is communicated with the first storage tank and the anaerobic reaction tank in parallel; the first storage tank, the second storage tank, the aerobic fermentation tank, the centrifugal device, the crushing device and the dryer are communicated in sequence; the anaerobic reaction tank is communicated with the gas collecting and processing device; the second storage tank is also communicated with a biological pond of a sewage treatment plant; the second storage tank is communicated with a magnesium salt feeding device.
Referring to fig. 2 or fig. 3, the reaction system for recycling sludge provided by the present invention further includes: a PLC control system 12; the PLC control system 12 is configured to control the feeding amount, the discharging amount, the feeding time, and the discharging time of the thermal hydrolysis system 2, the anaerobic fermentation system 3, the solid-liquid separation system 4, the acidified filtrate collection system 5, the cake processing nutrient soil system 6, the nitrogen and phosphorus recovery system 7, the biological tank 8 of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10, and the polyhydroxyalkanoate drying system 11.
Specifically, the feeding ends of the thermal hydrolysis system 2, the anaerobic fermentation system 3, the solid-liquid separation system 4, the acidification filtrate collection system 5, the cake processing nutrient soil system 6, the nitrogen and phosphorus recovery system 7, the biological pond 8 of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10 and the polyhydroxyalkanoate drying system 11 are provided with metering pumps (not shown in fig. 2 and 3); the PLC control system 12 controls the feeding amount, the discharging amount, the feeding time, and the discharging time of the thermal hydrolysis system 2, the anaerobic fermentation system 3, the solid-liquid separation system 4, the acidified filtrate collecting system 5, the cake processing nutrient soil system 6, the nitrogen and phosphorus recovery system 7, the biological tank 8 of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10, and the polyhydroxyalkanoate drying system 11 by controlling the flow rate and the operation time of the metering pump.
In a preferred embodiment of the present invention, the reaction system for resource utilization of sludge further comprises: a PLC control system 12; the PLC control system 12 is in signal connection with the first temperature control unit, the first pH sensor, the first stirring unit, the second temperature control unit, the second pH sensor, the second stirring unit, the third temperature control unit, the dissolved oxygen control unit, the third pH sensor, the fourth temperature control unit and the third stirring unit; the PLC control system 12 adjusts the temperatures in the thermal hydrolysis reaction tank, the anaerobic reactor, the anaerobic reaction tank, and the aerobic fermentation tank according to the signals of the first temperature control unit, the second temperature control unit, the third temperature control unit, and the fourth temperature control unit; the PLC control system 12 adjusts the pH values of the materials in the anaerobic reactor, the anaerobic reaction tank, and the aerobic fermentation tank according to the signals of the first pH sensor, the second pH sensor, and the third pH sensor.
In a preferred embodiment of the present invention, the PLC control system 12 is in signal connection with the dissolved oxygen sensor in the dissolved oxygen control unit, and adjusts the amount of gas entering the aerobic fermentation tank according to the signal of the dissolved oxygen sensor.
In a preferred embodiment of the present invention, in the case that the magnesium salt adding apparatus is provided with a liquid level meter, the PLC control system 12 controls the adding amount of the magnesium salt in the second storage tank according to a signal of the liquid level meter.
Example 1
The embodiment provides a reaction system for sludge resource utilization. Referring to fig. 2, the reaction system includes: the system comprises a thermal hydrolysis system 2, an anaerobic fermentation system 3, a solid-liquid separation system 4, an acidification filtrate collection system 5, a mud cake processing nutrient soil system 6, a nitrogen and phosphorus recovery system 7, a biological pond 8 of a sewage treatment plant, a polyhydroxyalkanoate synthesis fermentation system 9, a polyhydroxyalkanoate collection and extraction system 10, a polyhydroxyalkanoate drying system 11, metering pumps arranged at the feeding ends of the systems, and a PLC (programmable logic controller) control system 12; the thermal hydrolysis system 2, the anaerobic fermentation system 3 and the solid-liquid separation system 4 are sequentially communicated in series; the solid-liquid separation system 4 is communicated with the mud cake processing nutrient soil system 6 and the nitrogen and phosphorus recovery system 7 in parallel; the nitrogen and phosphorus recovery system 7 is communicated with the acidification filtrate collection system 5, and the acidification filtrate collection system 5 is communicated with a biological pond 8 of the sewage treatment plant and the polyhydroxy fatty acid ester synthesis fermentation system 9 in parallel; the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10 and the polyhydroxyalkanoate drying system 11 are communicated in sequence; the PLC control system 12 controls the feeding amount, the discharging amount, the feeding time, and the discharging time of the thermal hydrolysis system 2, the anaerobic fermentation system 3, the solid-liquid separation system 4, the acidified filtrate collection system 5, the cake processing nutrient soil system 6, the nitrogen and phosphorus recovery system 7, the biological tank 8 of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10, and the polyhydroxyalkanoate drying system 11 by controlling the flow rate and the running time of the metering pumps at the feeding ends of the above systems.
Example 2
The embodiment provides a reaction system for sludge resource utilization. Referring to fig. 3, the reaction system includes: the system comprises a thermal hydrolysis system 2, an anaerobic fermentation system 3, a solid-liquid separation system 4, an acidification filtrate collection system 5, a mud cake processing nutrient soil system 6, a nitrogen and phosphorus recovery system 7, a biological pond 8 of a sewage treatment plant, a polyhydroxyalkanoate synthesis fermentation system 9, a polyhydroxyalkanoate collection and extraction system 10, a polyhydroxyalkanoate drying system 11, metering pumps arranged at the feeding ends of the systems, and a PLC (programmable logic controller) control system 12; the thermal hydrolysis system 2, the anaerobic fermentation system 3 and the solid-liquid separation system 4 are sequentially communicated in series; the solid-liquid separation system 4 is communicated with the mud cake processing nutrient soil system 6 and the acidized filtrate collection system 5 in parallel; the acidification filtrate collecting system 5 is communicated with the nitrogen and phosphorus recovery system 7, and the nitrogen and phosphorus recovery system 7 is communicated with a biological pond 8 of a sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system 9 in parallel; the polyhydroxyalkanoate synthesis fermentation system 9, the polyhydroxyalkanoate collection and extraction system 10 and the polyhydroxyalkanoate drying system 11 are sequentially communicated.
The pyrohydrolysis system 2 comprises a pyrohydrolysis reaction tank, a steam generator and a flash tank; the steam generator and the flash tank are respectively communicated with the thermal hydrolysis reaction tank; the pyrohydrolysis reaction tank is provided with a first temperature control unit. The anaerobic fermentation system 3 is an anaerobic reactor and a gas collecting and treating device communicated with the anaerobic reactor; the anaerobic reactor is provided with a first pH sensor, a first stirring unit and a second temperature control unit. The solid-liquid separation system 4 is a plate-and-frame filter press. The acidified filtrate collection system 5 is a first tank with a precipitation function. The mud cake processing nutrient soil system 6 is an anaerobic reaction tank, and the anaerobic reaction tank is provided with a second pH sensor, a second stirring unit and a third temperature control unit. The nitrogen and phosphorus recovery system 7 is a second storage tank with a precipitation function and a magnesium salt adding device; the magnesium salt adding device is communicated with the second storage tank and is positioned above the second storage tank; the magnesium salt feeding device is provided with a liquid level meter. The polyhydroxyalkanoate synthesis fermentation system 9 is an aerobic fermentation tank; the aerobic fermentation tank is provided with a dissolved oxygen control unit, a third pH sensor, a fourth temperature control unit and a third stirring unit. The polyhydroxyalkanoate collection and extraction system 10 is a centrifugal device and a crushing device which are communicated in sequence. The polyhydroxyalkanoate drying system 11 is a dryer.
The PLC control system 12 is in signal connection with the first temperature control unit, the first pH sensor, the first stirring unit, the second temperature control unit, the second pH sensor, the second stirring unit, the third temperature control unit, the liquid level meter, the dissolved oxygen control unit, the third pH sensor, the fourth temperature control unit and the third stirring unit; the PLC control system 12 adjusts the temperatures in the thermal hydrolysis reaction tank, the anaerobic reactor, the anaerobic reaction tank, and the aerobic fermentation tank according to the signals of the first temperature control unit, the second temperature control unit, the third temperature control unit, and the fourth temperature control unit; the PLC control system 12 respectively adjusts the pH values of the materials in the anaerobic reactor, the anaerobic reaction tank and the aerobic fermentation tank according to the signals of the first pH sensor, the second pH sensor and the third pH sensor; and the PLC control system 12 controls the dosage of the magnesium salt added into the second storage tank according to the signal of the liquid level meter.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (10)

1. A reaction system for sludge resource utilization is characterized by comprising: the system comprises a thermal hydrolysis system (2), an anaerobic fermentation system (3), a solid-liquid separation system (4), an acidification filtrate collection system (5), a mud cake processing nutrient soil system (6), a biological pool (8) of a sewage treatment plant, a polyhydroxyalkanoate synthesis fermentation system (9), a polyhydroxyalkanoate collection and extraction system (10) and a polyhydroxyalkanoate drying system (11);
the thermal hydrolysis system (2), the anaerobic fermentation system (3) and the solid-liquid separation system (4) are sequentially communicated in series;
the solid-liquid separation system (4) is communicated with the mud cake processing nutrient soil system (6) and the acidification filtrate collection system (5) in parallel;
the acidification filtrate collecting system (5) is communicated with a biological pool (8) of the sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system (9) in parallel;
the polyhydroxyalkanoate synthesis fermentation system (9), the polyhydroxyalkanoate collection and extraction system (10) and the polyhydroxyalkanoate drying system (11) are communicated in sequence.
2. The reaction system according to claim 1, wherein the bottom of the biological basin (8) of the sewage treatment plant is in communication with the anaerobic fermentation system (3);
the reaction system also comprises a nitrogen and phosphorus recovery system (7);
the solid-liquid separation system (4) is communicated with the nitrogen and phosphorus recovery system (7) and then communicated with the acidified filtrate collection system (5);
or the acidification filtrate collection system (5) is communicated with the nitrogen and phosphorus recovery system (7) and then communicated with the biological pond (8) of the sewage treatment plant and the polyhydroxyalkanoate synthesis fermentation system (9) in parallel.
3. A reaction system according to claim 1, wherein the thermal hydrolysis system (2) comprises: a thermal hydrolysis reaction tank, a steam generator and a flash tank; the steam generator and the flash tank are respectively communicated with the thermal hydrolysis reaction tank; the pyrohydrolysis reaction tank is provided with a first temperature control unit;
the anaerobic fermentation system (3) comprises: the anaerobic reactor and a gas collecting and treating device communicated with the anaerobic reactor; the anaerobic reactor is provided with a first pH sensor, a first stirring unit and a second temperature control unit;
the mud cake processing nutrient soil system (6) comprises: an anaerobic reaction tank; the anaerobic reaction tank is provided with a second pH sensor, a second stirring unit and a third temperature control unit;
the polyhydroxyalkanoate synthesis fermentation system (9) comprises: an aerobic fermentation tank; the aerobic fermentation tank is provided with a dissolved oxygen control unit, a third pH sensor, a fourth temperature control unit and a third stirring unit;
the flash tank is communicated with the anaerobic reactor;
the solid-liquid separation system (4) is communicated with the anaerobic reaction tank;
the acidification filtrate collection system (5) is communicated with the aerobic fermentation tank.
4. The reaction system of claim 3, wherein an induced draft fan is arranged on a pipeline communicating the anaerobic reactor with the gas collecting and treating device;
a microbial filler is arranged in the gas collecting and processing device;
the dissolved oxygen control unit includes: air generator, air filter, dissolved oxygen sensor.
5. The reaction system of claim 2, further comprising a PLC control system (12); the PLC control system (12) controls the feeding amount, the discharging amount, the feeding time and the discharging time of the thermal hydrolysis system (2), the anaerobic fermentation system (3), the solid-liquid separation system (4), the acidification filtrate collection system (5), the mud cake processing nutrient soil system (6), the nitrogen and phosphorus recovery system (7), the biological pond (8) of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system (9), the polyhydroxyalkanoate collection and extraction system (10) and the polyhydroxyalkanoate drying system (11).
6. The reaction system according to claim 5, wherein the feeding ends of the thermal hydrolysis system (2), the anaerobic fermentation system (3), the solid-liquid separation system (4), the acidified filtrate collection system (5), the cake processing nutrient soil system (6), the nitrogen phosphorus recovery system (7), the biological pond (8) of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system (9), the polyhydroxyalkanoate collection and extraction system (10), and the polyhydroxyalkanoate drying system (11) are provided with metering pumps; the PLC control system (12) controls the flow and the running time of the metering pump to control the feeding amount, the discharging amount, the feeding time and the discharging time of the thermal hydrolysis system (2), the anaerobic fermentation system (3), the solid-liquid separation system (4), the acidification filtrate collection system (5), the mud cake processing nutrient soil system (6), the nitrogen and phosphorus recovery system (7), the biological pond (8) of the sewage treatment plant, the polyhydroxyalkanoate synthesis fermentation system (9), the polyhydroxyalkanoate collection and extraction system (10) and the polyhydroxyalkanoate drying system (11).
7. The reaction system of claim 3, further comprising: a PLC control system (12); the PLC control system (12) is in signal connection with the first temperature control unit, the first pH sensor, the first stirring unit, the second temperature control unit, the second pH sensor, the second stirring unit, the third temperature control unit, the dissolved oxygen control unit, the third pH sensor, the fourth temperature control unit and the third stirring unit;
the PLC control system (12) adjusts the temperature in the thermal hydrolysis reaction tank, the anaerobic reactor, the anaerobic reaction tank and the aerobic fermentation tank according to the signals of the first temperature control unit, the second temperature control unit, the third temperature control unit and the fourth temperature control unit;
and the PLC control system (12) is used for adjusting the pH values of the materials in the anaerobic reactor, the anaerobic reaction tank and the aerobic fermentation tank respectively according to signals of the first pH sensor, the second pH sensor and the third pH sensor.
8. The reaction system of claim 3, wherein the PLC control system (12) is in signal connection with the dissolved oxygen control unit and adjusts the amount of gas entering the aerobic fermentation tank according to the signal of the dissolved oxygen control unit.
9. The reaction system of claim 3, wherein the solid-liquid separation system (4) comprises at least one of a centrifuge, a plate-and-frame filter press, a membrane separation device;
the acidified filtrate collection system (5) comprises a first tank having a precipitation function;
the polyhydroxyalkanoate collecting and extracting system (10) comprises a centrifugal device and a crushing device which are communicated in sequence;
the polyhydroxyalkanoate drying system (11) comprises a dryer.
10. The reaction system of claim 2, wherein the nitrogen and phosphorus recovery system (7) comprises a second storage tank with a precipitation function and a magnesium salt adding device; the magnesium salt adding device is communicated with the second storage tank and is positioned above the second storage tank;
preferably, the magnesium salt adding device is provided with a liquid level meter; and the PLC control system (12) controls the adding amount of the magnesium salt in the second storage tank according to the signal of the liquid level meter.
CN201911343319.3A 2019-12-24 2019-12-24 Reaction system for sludge resource utilization Pending CN110877953A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111362561A (en) * 2020-03-25 2020-07-03 北京城市排水集团有限责任公司 Method for resource utilization of sludge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111362561A (en) * 2020-03-25 2020-07-03 北京城市排水集团有限责任公司 Method for resource utilization of sludge

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