CN112624500A - Kitchen waste sewage treatment system and method - Google Patents

Kitchen waste sewage treatment system and method Download PDF

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Publication number
CN112624500A
CN112624500A CN202011441289.2A CN202011441289A CN112624500A CN 112624500 A CN112624500 A CN 112624500A CN 202011441289 A CN202011441289 A CN 202011441289A CN 112624500 A CN112624500 A CN 112624500A
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tank
kitchen waste
sewage
sbr reactor
cod
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CN112624500B (en
Inventor
张磊
张锋
杜静
刘星华
王宏哲
金长林
任强兵
胡凯南
苏玉红
葛巍巍
王雪飞
石晓磊
高澎涛
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Hebei Zhongke Weide Environmental Engineering Co ltd
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Hebei Zhongke Weide Environmental Engineering 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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a kitchen waste sewage treatment system and method. The kitchen waste sewage treatment system comprises a first electrolytic tank, a sedimentation centrifugal tank, an SBR reactor, a regulating tank, a second electrolytic tank, an air floatation tank, a primary ABR reaction tank, a biological contact oxidation tank, a secondary sedimentation tank, a secondary ABR reaction tank, an MBR membrane bioreactor, a security filter and a nanofiltration device which are connected in sequence; the SBR reactor is also connected with the second-stage ABR anaerobic reaction tank and the MBR membrane bioreactor respectively; the MBR membrane bioreactor is also connected with the second-level ABR reaction tank. The kitchen waste sewage treatment system provided by the invention has the advantages of reasonable structure, reliability, high efficiency, strong adaptability, low cost and low energy consumption, and can efficiently and stably treat kitchen waste sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration.

Description

Kitchen waste sewage treatment system and method
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a kitchen waste sewage treatment system and method.
Background
With the continuous development of urban construction in China, the amount of kitchen waste is increasing day by day, and in the kitchen waste treatment process, the generated kitchen waste sewage has great harm to the environment. The kitchen waste sewage mainly refers to waste liquid left after the kitchen waste is recycled, and is characterized by containing a large amount of nutrient elements such as nitrogen and phosphorus and trace elements such as hydrolase, amino acid, organic acid, humic acid and gibberellin; high organic matter concentration and foul smell; poor biodegradability; the ammonia nitrogen concentration is high, and the ammonia nitrogen concentration accounts for about 85-90% of the total nitrogen. The Chemical Oxygen Demand (COD) in the kitchen waste sewage is up to 8000-10000mg/L, the ammonia nitrogen concentration is about 2500mg/L, and if the kitchen waste sewage which is not treated is directly discharged into the environment, water eutrophication can be caused, so that the environment pollution is caused; if the long-distance transportation treatment is adopted, the construction unit cannot bear the high energy consumption and high cost of the construction unit.
At present, the kitchen waste sewage treatment technologies studied at home and abroad can be divided into two types of recycling and harmless treatment. The resource treatment technology aims at resource utilization, and mainly produces composite biogas slurry fertilizer as agricultural fertilizer or organic feed for livestock by concentrating kitchen waste sewage, but the biogas slurry has large difference and complex composition, the effect on soil, crops and organisms is not clear yet, and the use of the biogas slurry fertilizer is limited, so the resource treatment technology of the kitchen waste sewage needs further research; the harmless treatment technology aims at reaching the discharge standard, comprises a natural ecological treatment technology and a biochemical treatment technology, and is an effective technology for treating kitchen waste sewage at present.
Although the biochemical treatment technology has a good and economic effect on treating the kitchen waste sewage, the kitchen waste sewage still possibly contains residual grease which is not completely separated, in the biological treatment technology, the grease can still be coated on the surfaces of microorganisms to influence the stable operation of the technology, for example, in the anaerobic technology, the anaerobic sludge can be caused to float upwards and flow out of a reactor, so that the reactor is not provided with enough sludge to degrade high-concentration organic matters in the inlet water; in the aerobic process, organic matters are difficult to penetrate into the aerobic sludge flocs, the removal effect is affected, and the effluent quality is also poor. In addition, the kitchen waste sewage quality is complicated, the water quality fluctuation is large, the pollutant concentration is extremely high, and the effluent indexes such as COD and SS are high, so that the biological treatment system is difficult to operate efficiently and stably, and the sewage treatment effect is influenced.
Disclosure of Invention
The invention provides a kitchen waste sewage treatment system and method, aiming at solving the problems that the existing sewage treatment system is difficult to efficiently and stably treat kitchen waste sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
the kitchen waste sewage treatment system comprises a first electrolytic tank, a sedimentation centrifugal tank, a SBR reactor, a regulating tank, a second electrolytic tank, an air floatation tank, a first-stage ABR reaction tank, a biological contact oxidation tank, a secondary sedimentation tank, a second-stage ABR reaction tank, an MBR membrane bioreactor, a security filter and a nanofiltration device which are sequentially connected. The first electrolytic tank is provided with a sewage inlet and is used for being connected with a kitchen waste sewage pipeline; the SBR reactor is also connected with the second-stage ABR anaerobic reaction tank and the MBR membrane bioreactor respectively; the MBR membrane bioreactor is also connected with the second-stage ABR reaction tank; a COD detection device and an ammonia nitrogen detection device are arranged in the SBR reactor and the MBR membrane bioreactor and are used for monitoring COD and/or ammonia nitrogen content in the sewage in real time and ensuring the treatment effect of the sewage; aerators are arranged in the regulating tank, the first electrolytic tank, the second electrolytic tank, the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor; the aerator of the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are respectively connected with the fan through a first heat exchanger, and the first heat exchanger is used for adjusting the temperature of gas sent into the aerator and avoiding the influence of the fluctuation of the sewage temperature on the treatment effect; the SBR reactor is communicated with the second heat exchanger and is used for adjusting the temperature of the sewage in the SBR reactor; the SBR reactor is also internally provided with a temperature detector and a pH detector which are used for respectively detecting the temperature and the pH of the sewage so as to ensure the smooth proceeding of the reaction in the SBR reactor and ensure the sewage treatment effect.
Compared with the prior art, the kitchen waste sewage treatment system provided by the invention has the advantages that the first electrolytic tank and the sedimentation centrifugal tank are utilized to pretreat kitchen waste sewage, grease existing in the sewage in the forms of suspended oil, dispersed oil, dissolved oil and emulsion is removed, SS (suspended substances) and partial organic substances in the sewage are reduced, and the subsequent biological treatment process is favorably and smoothly carried out. And (3) the kitchen waste sewage after pretreatment enters an SBR reactor, and after short-cut nitrification-anaerobic ammonia oxidation-denitrification, the kitchen waste sewage with high-concentration COD and ammonia nitrogen is converted into the kitchen waste sewage with lower-concentration or low-concentration COD and ammonia nitrogen. The sewage with lower concentration of COD and ammonia nitrogen is filtered by a regulating tank, a second electrolytic tank, an air flotation tank, a first-stage ABR reaction tank, a biological contact oxidation tank, a secondary sedimentation tank, a second-stage ABR reaction tank, an MBR membrane bioreactor, a security filter and a nanofiltration device in sequence and then discharged; the kitchen waste sewage with low concentration COD and ammonia nitrogen is discharged after being filtered by the second-stage ABR reaction tank, the MBR membrane bioreactor, the security filter and the nanofiltration device in sequence or is discharged after being filtered by the MBR membrane bioreactor, the security filter and the nanofiltration device in sequence. The kitchen waste sewage treatment system provided by the invention combines physical, chemical and biological methods to treat kitchen waste sewage, and has the advantages of reasonable structure, reliability, high efficiency, strong adaptability, stable operation, convenience in maintenance, low cost and low energy consumption. The system can operate efficiently and stably, has excellent pollutant removal effect on the kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration, and meets the discharge requirements of effluent indexes such as COD (chemical oxygen demand), SS (suspended substance), ammonia nitrogen and the like.
As another embodiment of the invention, the first electrolytic cell and the second electrolytic cell are both provided with Fe-C packing, and the first-stage ABR reaction cell and the second-stage ABR reaction cell are both provided with anaerobic microorganism packing; and the biological contact oxidation pond is internally provided with biological fillers.
As another embodiment of the invention, the first-stage ABR reaction tank and the second-stage ABR reaction tank are respectively provided with a submersible stirrer, a guide plate and a sludge reflux pump, so that anaerobic reaction can be fully performed and sludge can be smoothly led out.
As another embodiment of the invention, the sedimentation and centrifugation tank, the first electrolytic tank, the second electrolytic tank and the air flotation tank are all provided with a chemical feeding device; the dosing devices comprise a medicine storage barrel, a stirrer and a metering pump; the chemical adding device of the sedimentation centrifugal tank comprises a PAC chemical adding device, a PAM chemical adding device, a PFS chemical adding device and FeCl3The dosing devices of the first electrolytic cell and the second electrolytic cell are HCl dosing devices; the dosing device of the air floatation tank is a PAM dosing device.
As another embodiment of the invention, the sedimentation centrifuge tank is provided with a horizontal spiral discharge sedimentation centrifuge which is matched with a dosing device to realize flocculation sedimentation centrifugation, remove grease in sewage and reduce SS and partial organic substances in the sewage; the air supporting pond is equipped with the air supporting machine, and the air supporting machine links to each other with the air compressor machine through dissolving gas pitcher and gas holder, and the air supporting machine is the backward flow formula pressurization and dissolves gas air supporting machine, mutually supports with PAM charge device, guarantees the solid-liquid separation effect.
As another embodiment of the present invention, the first electrolytic cell and the second electrolytic cell are respectively provided with a pipeline mixer and a pH detector, so as to control the pH of the sewage and ensure the electrolytic effect, and when the first electrolytic cell preliminarily removes the COD in the sewage, fine bubbles generated during the electrolysis process are adsorbed on the surface of oil droplets, so that the oil droplets can float up to the liquid surface together with the bubbles to separate the oil from the water, and the second electrolytic cell further removes the COD and removes a very small amount of grease which may remain.
As another embodiment of the invention, the aerators in the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are rotary mixing aerators.
As another embodiment of the present invention, the aerators in the conditioning tank, the first electrolytic tank and the second electrolytic tank are perforated aerators.
As another embodiment of the invention, the aerators of the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are respectively connected with a first fan through a first heat exchanger and are used for controlling the outlet air temperature of the aerators; and the aerators of the regulating tank, the first electrolytic tank and the second electrolytic tank are respectively connected with a second fan.
As another embodiment of the invention, a COD detection device and an ammonia nitrogen detection device are arranged in the sedimentation centrifuge tank and are used for detecting COD and ammonia nitrogen content of centrifuged sewage, so that the number and connection relationship of subsequent SBR reactors can be conveniently determined.
As another embodiment of the invention, the SBR reactor is provided with a plurality of groups; a plurality of groups between SBR reactor each other, a plurality of groups SBR reactor with subside between the centrifugal basin and a plurality of groups SBR reactor with all through the pipe connection who is equipped with the solenoid valve between the equalizing basin, a plurality of groups of being convenient for SBR reactor quantity's increase and decrease and the conversion of the parallelly connected operating condition of cluster guarantee the treatment effect to reply the kitchen garbage sewage that quality of water is complicated, quality of water is undulant big and pollutant concentration is very high.
As another embodiment of the present invention, the kitchen waste sewage treatment system further includes a controller, the controller is respectively connected to the COD detection device and the ammonia nitrogen detection device in the sedimentation centrifuge tank, and is also respectively connected to the solenoid valves on the pipelines between the plurality of sets of SBR reactors, between the plurality of sets of SBR reactors and the sedimentation centrifuge tank, and between the plurality of sets of SBR reactors and the regulation tank, for controlling the opening and closing of the solenoid valves according to signals of the COD detection device and the ammonia nitrogen detection device, so that the plurality of sets of SBR reactors complete serial-parallel conversion or separate operation, thereby improving the adaptability of the system.
As another embodiment of the invention, the kitchen waste sewage treatment system further comprises a sludge tank;
the sedimentation centrifugal tank, the secondary sedimentation tank, the primary ABR reaction tank, the secondary ABR reaction tank and the air floatation tank are all connected with the sludge tank and used for conveying the generated sludge and scum to the sludge tank.
As another embodiment of the invention, the kitchen waste sewage treatment system further comprises a cleaning device and a concentrated water tank, wherein the cleaning device is connected with the nanofiltration device and is used for cleaning the nanofiltration device, the obtained concentrated water enters the concentrated water tank, the obtained concentrated water is subjected to coagulating sedimentation, the effluent enters the Fenton reaction tank, and the water outlet of the Fenton reaction tank is connected with the regulating tank.
As another embodiment of the invention, the sludge tank is sequentially connected with the anaerobic tank and the biogas residue dehydration equipment, and the anaerobic fermentation is carried out by using microorganisms in the sludge, which is beneficial to reducing the cost and the energy consumption.
The invention also provides a kitchen waste sewage treatment method, and the kitchen waste sewage treatment system comprises the following steps:
carrying out electrolysis treatment and flocculation sedimentation centrifugation treatment on kitchen waste sewage, sending the kitchen waste sewage into an SBR reactor for reaction by adopting a step water inlet process, adjusting the temperature of the sewage by utilizing a first heat exchanger and a second heat exchanger, and detecting COD (chemical oxygen demand) and ammonia nitrogen content after the reaction is finished;
if the COD and/or the ammonia nitrogen content is within a first preset range, the sewage treated by the SBR reactor is sent to a regulating tank for water quality regulation, and then is subjected to secondary electrolysis treatment, air flotation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification in sequence, and then is discharged after security filtration and nanofiltration treatment;
if the COD and/or the ammonia nitrogen content is within a second preset range, sequentially carrying out secondary ABR anaerobic reaction and MBR purification on the sewage treated by the SBR reactor, and then discharging the sewage after security filtration and nanofiltration treatment;
and if the COD and/or the ammonia nitrogen content is within a third preset range, performing MBR purification on the sewage treated by the SBR reactor, and then discharging the sewage after security filtration and nanofiltration treatment.
Specifically, the MBR membrane bioreactor adopts a split type membrane bioreactor to separately place the bioreactor and a membrane component, the mixed liquid of the membrane bioreactor enters the membrane component after being pressurized, the liquid in the mixed liquid permeates the membrane under the action of pressure to obtain system effluent, and the activated sludge is intercepted and flows back into the MBR bioreactor along with the concentrated solution; intercepting the activated sludge and solid after biological treatment in the tank by using a membrane separation device immersed in the aerobic biological tank; the membrane bioreactor can retain microorganisms with longer generation period due to effective interception, can realize deep purification of sewage, simultaneously nitrifying bacteria can be fully propagated in the system, has obvious nitrification effect, and provides possibility for deep phosphorus and nitrogen removal.
Compared with the prior art, the kitchen waste sewage treatment method provided by the invention comprises the steps of firstly pretreating kitchen waste sewage by utilizing the electrolysis effect of a first electrolytic tank and the flocculation sedimentation centrifugation effect of a sedimentation centrifugation tank, removing grease existing in the form of suspended oil, dispersed oil, dissolved oil and emulsion in the sewage, reducing SS (suspended substances) and partial organic substances in the sewage, then treating the pretreated kitchen waste sewage by utilizing an SBR (sequencing batch reactor), and controlling the temperature and the aeration time in the reaction process to convert the kitchen waste sewage subjected to short-cut nitrification-anaerobic ammonia oxidation-denitrification into the kitchen waste sewage with lower concentration or low concentration of COD (chemical oxygen demand) and ammonia nitrogen. If the COD and/or ammonia nitrogen content of the sewage is higher than a first preset range, the sewage is sent to a regulating tank for water quality regulation, and then secondary electrolytic treatment is sequentially carried out (organic pollutants in the sewage are removed, and biodegradability is improved); air flotation separation (solid-liquid separation is realized); first-order ABR anaerobic reaction (degrading macromolecular pollutants and further improving the biodegradability of sewage); biological contact oxidation (organic matter removal and ammonia nitrogen nitration); secondary precipitation (removing activated sludge in the biological contact oxidation aerobic section and protecting anaerobic microorganisms in a subsequent anaerobic reactor from impact); secondary ABR anaerobic reaction (degrading macromolecular pollutants in water again, improving the biodegradability of wastewater, removing organic matters, performing denitrification) and MBR purification, and then discharging after security filtration and nanofiltration treatment. If the COD and/or ammonia nitrogen content of the sewage is lower, the sewage can be directly subjected to secondary ABR anaerobic reaction, MBR purification or MBR purification and then is discharged after security filtration and nanofiltration treatment. The kitchen waste sewage treatment method provided by the invention has the advantages of reliable and efficient process and strong adaptability, and can efficiently and stably treat kitchen waste sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration.
Further, the reaction temperature in the SBR reactor is 33-39 ℃; the treatment time of the sewage in the SBR reactor is 6.5-7.5 days; the aeration time interval is 6-7.5 h, each time of aeration is 3-4 h, so that the dissolved oxygen during aeration is 2.3-2.7 mg/L, and the dissolved oxygen during non-aeration is 0.14-0.7mg/L, the smooth proceeding of the shortcut nitrification-anaerobic ammonia oxidation-denitrification process is ensured, the pH value in the reactor is favorably maintained, and the strains in the sludge can efficiently remove pollutants in the sewage with high ammonia nitrogen and low C/N ratio.
Further, the COD content in the first preset range is 2000-4000mg/L, and the ammonia nitrogen content is 200-500 mg/L; in the second preset range, the COD content is 1000-2000mg/L, and the ammonia nitrogen content is 80-200 mg/L; in the third preset range, the COD content is less than 1000mg/L, the ammonia nitrogen content is less than 80mg/L, and different treatment paths are selected according to different COD and ammonia nitrogen contents, so that the efficiency is improved, the cost is reduced, and the energy consumption is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a connection structure of a kitchen waste sewage treatment system provided by an embodiment of the invention;
FIG. 2 is a schematic view of a connection structure of a kitchen waste sewage treatment system provided by an embodiment of the invention;
FIG. 3 is a schematic view of a connection structure of a kitchen waste sewage treatment system provided by an embodiment of the invention;
in the figure: 1. a first electrolytic cell; 2. settling and centrifuging the pond; 3. an SBR reactor; 4. a regulating tank; 5. a second electrolytic cell; 6. an air floatation tank; 7. a first-stage ABR reaction tank; 8. a biological contact oxidation pond; 9. a secondary sedimentation tank; 10. a secondary ABR reaction tank; 11. an MBR membrane bioreactor; 12. a cartridge filter; 13. a nanofiltration device; 14. a first heat exchanger; 15. a second heat exchanger; 16. a sludge tank; 17. a COD detection device; 18. an ammonia nitrogen detection device; 19. an electromagnetic valve; 20. and a controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 2 together, a kitchen waste sewage treatment system according to the present invention will now be described. Kitchen garbage sewage treatment system is including consecutive first electrolytic bath 1, subside centrifugal bath 2, SBR reactor 3, equalizing basin 4, second electrolytic bath 5, air supporting pond 6, one-level ABR reaction tank 7, biological contact oxidation pond 8, two heavy ponds 9, second grade ABR reaction tank 10, MBR membrane bioreactor 11, cartridge filter and nanofiltration device 12. The first electrolytic tank 1 is provided with a sewage inlet and is used for being connected with a kitchen waste sewage pipeline; the SBR reactor 3 is also respectively connected with a second-stage ABR anaerobic reaction tank 10 and an MBR membrane bioreactor 11; the MBR membrane bioreactor 11 is also connected with a second-level ABR reaction tank 10; a COD detection device and an ammonia nitrogen detection device are arranged in the SBR reactor 3 and the MBR membrane bioreactor 11 and are used for monitoring COD and ammonia nitrogen content in real time; aerators are arranged in the regulating tank 4, the first electrolytic tank 1, the second electrolytic tank 5, the SBR reactor 3, the biological contact oxidation tank 8 and the MBR membrane bioreactor 11; the SBR reactor 3, the biological contact oxidation tank 8 and the aerator of the MBR membrane bioreactor 11 are respectively connected with a fan through a first heat exchanger 14; the SBR reactor 3 is communicated with a second heat exchanger 15 and is used for adjusting the temperature of the sewage in the SBR reactor 3; the SBR reactor 3 is also internally provided with a temperature detector and a pH detector which are used for respectively detecting the temperature and the pH of the sewage and ensuring the smooth operation of the SBR reactor.
Compared with the prior art, the kitchen waste sewage treatment system provided by the invention has the advantages that the kitchen waste sewage is pretreated by the first electrolytic tank 1 and the sedimentation centrifugal tank 2, grease existing in the form of suspended oil, dispersed oil, dissolved oil and emulsion in the sewage is removed, SS (suspended substances) and partial organic substances in the sewage are reduced, and the subsequent biological treatment process is favorably and smoothly carried out. The kitchen waste sewage after pretreatment enters an SBR reactor 3, and after shortcut nitrification-anaerobic ammonia oxidation-denitrification, the kitchen waste sewage with high concentration of COD and ammonia nitrogen is converted into the kitchen waste sewage with lower concentration or low concentration of COD and ammonia nitrogen. Sewage with lower concentration of COD and ammonia nitrogen is discharged after being filtered by a regulating tank 4, a second electrolytic tank 5, an air flotation tank 6, a first-stage ABR reaction tank 7, a biological contact oxidation tank 8, a secondary sedimentation tank 9, a second-stage ABR reaction tank 10, an MBR membrane bioreactor 11, a security filter 12 and a nanofiltration device 13 in sequence; the kitchen waste sewage with low-concentration COD and ammonia nitrogen is discharged after being filtered by the second-stage ABR reaction tank 10, the MBR membrane bioreactor 11, the security filter 12 and the nanofiltration device 13 in sequence or discharged after being filtered by the MBR membrane bioreactor 11, the security filter 12 and the nanofiltration device 13 in sequence. The kitchen waste sewage treatment system provided by the invention combines physical, chemical and biological methods to treat kitchen waste sewage, and has the advantages of reasonable structure, reliability, high efficiency, strong adaptability, stable operation, convenience in maintenance, low cost and low energy consumption. The system can operate efficiently and stably, has excellent removal effect on pollutants in the kitchen waste sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration, and can treat the kitchen waste sewage with COD as high as 8000-one 12000mg/L and ammonia nitrogen concentration as high as 2500-3500 mg/L.
As a specific embodiment of the kitchen waste sewage treatment system provided by the present invention, please refer to fig. 2, the kitchen waste sewage treatment system further includes a sludge tank 16; the sedimentation centrifugal tank 2, the secondary sedimentation tank 9, the primary ABR reaction tank 7, the secondary ABR reaction tank 10 and the air flotation tank 6 are all connected with a sludge tank 16 and are used for conveying sludge and scum generated in the sewage treatment process to the sludge tank 16.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, Fe-C fillers are arranged in the first electrolytic tank 1 and the second electrolytic tank 5 and are used for removing organic pollutants and improving biodegradability; anaerobic microbial fillers are arranged in the first-stage ABR reaction tank 7 and the second-stage ABR reaction tank 10 and are used for degrading macromolecular pollutants in water, improving the biodegradability of sewage and removing part of pollutants; the biological contact oxidation tank 8 is internally provided with biological filler for removing organic matters and carrying out ammonia nitrogen nitration.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, the submersible stirrer, the guide plate and the sludge reflux pump are arranged in the first-stage ABR reaction tank 7 and the second-stage ABR reaction tank 9, so that the anaerobic reaction can be fully carried out and the sludge can be smoothly led out.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, the sedimentation centrifugal tank 2, the first electrolytic tank 1, the second electrolytic tank 5 and the air floatation tank 6 are all provided with dosing devices; the dosing devices comprise a medicine storage barrel, a stirrer and a metering pump; the chemical adding device of the sedimentation centrifugal tank 2 comprises a PAC chemical adding device, a PAM chemical adding device, a PFS chemical adding device and FeCl3The chemical adding devices are matched with the centrifugal machine and the first electrolytic cell 1 to achieve the purpose of removing grease under the synergistic effect, and the chemical adding devices of the first electrolytic cell 1 and the second electrolytic cell 5 are HCl chemical adding devices; the dosing device of the air floatation tank 6 is a PAM dosing device.
The kitchen waste sewage provided by the inventionIn one embodiment of the treatment system, the sedimentation centrifuge tank 2 is provided with a horizontal spiral discharge sedimentation centrifuge, a PAC dosing device, a PAM dosing device, a PFS dosing device and FeCl3The dosing devices are mutually matched to realize flocculation, precipitation and centrifugation, remove grease in the sewage and reduce SS and partial organic substances in the sewage; the air flotation tank 6 is provided with an air flotation machine which is connected with an air compressor through a dissolved air tank and an air storage tank, and the air flotation machine is a backflow type pressurization dissolved air flotation machine and is mutually matched with a PAM dosing device, so that the solid-liquid separation effect is ensured.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, a pipeline mixer and a pH detector are arranged in the first electrolytic tank 1 and the second electrolytic tank 5, so that the pH value of sewage can be conveniently controlled, the electrolytic effect is ensured, fine bubbles generated in the electrolytic process are adsorbed on the surface of oil drops while pollutants in the sewage are primarily removed in the first electrolytic tank 1, so that the oil drops can float up to the liquid surface along with the bubbles to realize the separation of oil and water, the pollutants are further removed in the second electrolytic tank 5, and the possibly remained extremely small amount of grease is removed.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, aerators in the SBR reactor 3, the biological contact oxidation tank 8 and the MBR membrane bioreactor 11 are rotary mixing aerators.
As a specific embodiment of the kitchen waste sewage treatment system provided by the invention, the aerators in the regulating tank 4, the first electrolytic tank 1 and the second electrolytic tank 5 are perforated aerators.
As a specific embodiment of the kitchen waste sewage treatment system provided by the invention, aerators of the SBR reactor 3, the biological contact oxidation tank 8 and the MBR membrane bioreactor 11 are respectively connected with a first fan through a first heat exchanger 14, and are used for controlling the outlet air temperature of the aerators; the aerators of the regulating tank 4, the first electrolytic tank 1 and the second electrolytic tank 5 are respectively connected with a second fan.
Referring to fig. 2, a sedimentation centrifuge tank 2 is provided with a COD detection device 17 and an ammonia nitrogen detection device 18 for detecting COD and ammonia nitrogen content of centrifuged sewage, so as to facilitate determination of the number and connection relationship of the subsequent SBR reactors 3.
As a specific embodiment of the kitchen waste sewage treatment system provided by the present invention, please refer to fig. 3, an SBR reactor 3 is provided with 3 groups; 3 SBR reactor 3 of group are each other, SBR reactor 3 and subside between centrifugal basin 2 and SBR reactor 3 and equalizing basin 4 between all through the tube coupling that is equipped with solenoid valve 19, the increase and decrease of 3 quantity of SBR reactor of being convenient for and the conversion of series-parallel connection operating condition guarantee the treatment effect to reply the kitchen garbage sewage that quality of water is complicated, quality of water fluctuation is big and pollutant concentration is very high.
As a specific embodiment of the kitchen waste sewage treatment system provided by the present invention, please refer to fig. 3, the kitchen waste sewage treatment system further comprises a controller 20, the controller 20 is electrically connected with the COD detection device 17 and the ammonia nitrogen detection device 18 in the sedimentation centrifugal tank 2, and is also electrically connected with the SBR reactor 3, the SBR reactor 3 and the sedimentation centrifugal tank 2, and the SBR reactor 3 and the adjusting tank 4 via electromagnetic valves 19 on the pipelines, is used for controlling the opening and closing of the electromagnetic valve according to the signals of the COD detection device and the ammonia nitrogen detection device, so that a plurality of groups of SBR reactors complete series-parallel conversion or independent operation, the adaptability of the system is improved, when the COD and the ammonia nitrogen content of the sewage in the sedimentation centrifugal tank 2 are extremely high (exceed preset values), the controller 20 controls the opening and closing of the electromagnetic valve, so that the SBR reactor 3 is operated in series, and the treatment effect is ensured; when the sewage COD and ammonia nitrogen content in the sedimentation centrifugal tank 2 are lower (lower than preset values), the controller 20 controls the on-off of the electromagnetic valve, so that the SBR reactor 3 operates independently or in parallel, the treatment of high-concentration kitchen waste sewage can be met, the kitchen waste sewage with lower concentration can be treated efficiently, and the efficient and stable operation of the system is ensured.
In order to better illustrate the kitchen waste sewage treatment method provided by the embodiment of the invention, the following further illustrates the method by the embodiment.
Example 1
A kitchen waste sewage treatment method comprises the following steps:
delivering kitchen waste sewage (COD content is 11520mg/L, ammonia nitrogen content is 3205mg/L) into a first electrolytic tank 1 for electrolytic treatment, delivering the kitchen waste sewage into a sedimentation centrifugal tank 2, and adding PAC, PAM, PFS and FeCl3Carrying out flocculation sedimentation centrifugation treatment, then sending the sewage into an SBR reactor 3 for reaction by adopting a step-by-step water inlet process, wherein the aeration time interval is 6h, each aeration time is 4h, the temperature of the sewage is controlled to be 36 ℃ by utilizing a first heat exchanger 14 and a second heat exchanger 15, the treatment time of the sewage in the SBR reactor 3 is 7d, and after the treatment is finished, the COD content and the ammonia nitrogen content are detected, wherein the COD content is 2413mg/L, and the ammonia nitrogen content is 252 mg/L;
the sewage treated by the SBR reactor 3 is sent to a regulating tank 4 for water quality regulation, and then is sequentially subjected to secondary electrolysis treatment, air floatation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification, and finally is subjected to security filtration and nanofiltration treatment, and finally is discharged after reaching the standard, the concentrated water cleaned by the nanofiltration device 13 enters a concentrated water tank, the effluent after coagulation precipitation enters a Fenton reaction tank, and is sent to the regulating tank 4 for recycling after being treated by the Fenton reaction tank.
Wherein each ton of sewage consumes PFS10Kg, PAC15Kg, PAM3Kg, HCl3Kg and FeCl310Kg of Fe-C filler with an annual loss rate of 10%,
the results of the quality of the wastewater preliminarily treated by the above method are shown in Table 1 below.
Figure BDA0002830391720000121
Example 2
A kitchen waste sewage treatment method utilizes the kitchen waste sewage treatment system, and comprises the following steps:
delivering kitchen waste sewage (COD content is 8123mg/L, ammonia nitrogen content is 2564mg/L) into a first electrolytic tank 1 for electrolytic treatment, delivering into a sedimentation centrifugal tank 2, and adding PAC, PAM, PFS and FeCl3Performing flocculation sedimentation and centrifugation treatment, then sending into SBR reactor 3 for reaction by adopting a step water inlet process, wherein the aeration time interval is 7.5h every timeThe secondary aeration time is 3 hours, the temperature of the sewage is controlled to be 39 ℃ by utilizing the first heat exchanger 14 and the second heat exchanger 15, the treatment time of the sewage in the SBR reactor is 6.5 days, and the COD and the ammonia nitrogen content are detected after the treatment is finished, wherein the COD content is 1108mg/L, and the ammonia nitrogen content is 221 mg/L;
and (2) sequentially carrying out secondary ABR anaerobic reaction and MBR purification on the sewage treated by the SBR reactor 3, carrying out security filtration and nanofiltration treatment, and finally discharging the sewage after reaching the standard, wherein the concentrated water cleaned by the nanofiltration device 13 enters a concentrated water tank, the effluent after coagulating sedimentation enters a Fenton reaction tank, and the effluent after being treated by the Fenton reaction tank is sent to the regulating tank 4 for recycling.
Wherein each ton of sewage consumes PFS10Kg, PAC14.5Kg, PAM3.2Kg, HCl2.8Kg and FeCl310Kg of Fe-C filler with an annual loss rate of 10%,
the results of the quality of the wastewater preliminarily treated by the above method are shown in Table 2 below.
Figure BDA0002830391720000131
From the above data, it can be seen that the sewage treated by the method of the present invention can well meet the three-level standard (CODcr: 500 mg/L; BOD) in GB8978-1996 Integrated wastewater discharge Standard5: 300mg/L), in particular the suspended matter SS content has met the first order standard requirements (SS: 70 mg/L).
In order to better illustrate the technical solution of the present invention, further comparison is made below by means of a comparative example and an example of the present invention.
Comparative example 1
A kitchen waste sewage treatment method comprises the following steps:
delivering kitchen waste sewage (COD content is 11520mg/L, ammonia nitrogen content is 3205mg/L) into a first electrolytic tank 1 for electrolytic treatment, delivering the kitchen waste sewage into a sedimentation centrifugal tank 2, and adding PAC, PAM, PFS and FeCl3Performing flocculation sedimentation and centrifugation treatment;
and (3) conveying the sewage subjected to centrifugal treatment into an adjusting tank 4 for water quality adjustment, sequentially carrying out secondary electrolysis treatment, air flotation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification, carrying out security filtration and nanofiltration treatment, and detecting that the sewage cannot reach the standard.
Wherein each ton of sewage consumes PFS15Kg, PAC18Kg, PAM5Kg, HCl6Kg and FeCl312Kg，
The results of the quality of the wastewater preliminarily treated by the above method are shown in Table 3 below:
Figure BDA0002830391720000141
comparative example 2
A kitchen waste sewage treatment method comprises the following steps:
delivering kitchen waste sewage (COD content is 11520mg/L, ammonia nitrogen content is 3205mg/L) into a first electrolytic tank for electrolytic treatment, delivering the sewage into a coagulation tank, adding MgCl2、Na2HPO4PAC and PAM are precipitated and separated, and then fed into an SBR reactor for reaction by adopting a step-feed process, wherein the aeration time interval is 6h, each aeration time is 4h, the temperature of sewage is controlled to be 36 ℃ by utilizing a first heat exchanger and a second heat exchanger, the treatment time of the sewage in the SBR reactor is 7d, and after the treatment is finished, the COD and ammonia nitrogen content are detected, wherein the COD content is 3154mg/L, and the ammonia nitrogen content is 553 mg/L;
the sewage treated by the SBR reactor is sent to a regulating tank 4 for water quality regulation, and then secondary electrolysis treatment, air flotation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification are sequentially carried out, security filtration and nanofiltration treatment are carried out to detect the sewage quality, the concentrated water cleaned by a nanofiltration device 13 enters a concentrated water tank, the effluent water enters a Fenton reaction tank after coagulation precipitation, and is sent to the regulating tank 4 for recycling after being treated by the Fenton reaction tank.
Wherein, PAC20Kg, PAM5Kg, HCl5Kg and MgCl are consumed by each ton of sewage212Kg、Na2HPO46Kg，
The results of the quality of the wastewater preliminarily treated by the above method are shown in Table 4 below.
Figure BDA0002830391720000142
According to the kitchen waste sewage treatment method provided by the invention, the kitchen waste sewage is pretreated by utilizing the electrolysis effect of the first electrolytic tank and the flocculation sedimentation centrifugation effect of the sedimentation centrifugation tank, so that the grease existing in the form of suspended oil, dispersed oil, dissolved oil and emulsion in the sewage can be effectively removed, the SS (suspended substances) and part of organic substances in the sewage are reduced, and the stability of the SBR reactor is favorably ensured. Then, the SBR is used for treating the pretreated kitchen waste sewage, and the high-concentration kitchen waste sewage is converted into sewage with lower concentration or low concentration, so that the stable and smooth operation of subsequent processes is ensured. The method has the advantages of reliable and efficient process and strong adaptability, and can efficiently and stably treat the kitchen waste sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides a kitchen garbage sewage treatment system which characterized in that: the device comprises a first electrolytic tank, a sedimentation centrifugal tank, an SBR reactor, a regulating tank, a second electrolytic tank, an air floatation tank, a first-stage ABR reaction tank, a biological contact oxidation tank, a second sedimentation tank, a second-stage ABR reaction tank, an MBR membrane bioreactor, a security filter and a nanofiltration device which are connected in sequence;
the first electrolytic tank is provided with a sewage inlet and is used for being connected with a kitchen waste sewage pipeline;
the SBR reactor is also connected with the second-stage ABR anaerobic reaction tank and the MBR membrane bioreactor respectively; the MBR membrane bioreactor is also connected with the second-stage ABR reaction tank; a COD detection device and an ammonia nitrogen detection device are arranged in the SBR reactor and the MBR membrane bioreactor;
aerators are arranged in the regulating tank, the first electrolytic tank, the second electrolytic tank, the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor; the aerator of the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are respectively connected with the fan through a first heat exchanger, and the first heat exchanger is used for adjusting the temperature of gas sent into the aerator and avoiding the fluctuation of the sewage temperature;
the SBR reactor is communicated with the second heat exchanger and is used for adjusting the temperature of the sewage in the SBR reactor; and a temperature detector and a pH detector are also arranged in the SBR reactor and are used for respectively detecting the temperature and the pH of the sewage.
2. The kitchen waste sewage treatment system of claim 1, characterized in that: Fe-C fillers are arranged in the first electrolytic cell and the second electrolytic cell, and anaerobic microbial fillers are arranged in the first-stage ABR reaction cell and the second-stage ABR reaction cell; and the biological contact oxidation pond is internally provided with biological fillers.
3. The kitchen waste sewage treatment system of claim 2, characterized in that: the sedimentation centrifugal tank, the first electrolytic tank, the second electrolytic tank and the air floatation tank are all provided with a dosing device; the dosing devices comprise a medicine storage barrel, a stirrer and a metering pump; the chemical adding device of the sedimentation centrifugal tank comprises a PAC chemical adding device, a PAM chemical adding device, a PFS chemical adding device and FeCl3The chemical adding devices of the first electrolytic cell and the second electrolytic cell are HCl chemical adding devices; and the dosing device of the air floatation tank is a PAM dosing device.
4. The kitchen waste sewage treatment system of any one of claims 1 to 3, characterized in that: and a COD detection device and an ammonia nitrogen detection device are arranged in the sedimentation centrifuge.
5. The kitchen waste sewage treatment system of claim 4, characterized in that: the SBR reactor is provided with a plurality of groups; the SBR reactors are connected with each other, the sedimentation centrifugal tanks and the adjusting tanks through pipelines provided with electromagnetic valves.
6. The kitchen waste sewage treatment system of claim 5, characterized in that: still include the controller, the controller respectively with subside COD detection device and ammonia nitrogen detection device in the centrifugal pond and be connected, still respectively with a plurality of groups the SBR reactor is each other, a plurality of groups the SBR reactor with subside between the centrifugal pond and a plurality of groups the SBR reactor with solenoid valve on the pipeline is connected between the equalizing basin, the controller is used for controlling the switching of solenoid valve according to the signal that COD detection device and ammonia nitrogen detection device carried, makes a plurality of groups the SBR reactor accomplishes the conversion of connecting in series and in parallel.
7. The kitchen waste sewage treatment system of claim 1, characterized in that: also comprises a sludge tank;
the sedimentation centrifugal tank, the secondary sedimentation tank, the primary ABR reaction tank, the secondary ABR reaction tank and the air floatation tank are all connected with the sludge tank and used for conveying the generated sludge and scum to the sludge tank.
8. A kitchen waste sewage treatment method using the kitchen waste sewage treatment system according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
carrying out electrolysis treatment and flocculation sedimentation centrifugation treatment on kitchen waste sewage, sending the kitchen waste sewage into an SBR reactor for reaction by adopting a step water inlet process, adjusting the temperature of the sewage by utilizing a first heat exchanger and a second heat exchanger, and detecting COD (chemical oxygen demand) and ammonia nitrogen content after the reaction is finished;
if the COD and/or the ammonia nitrogen content is within a first preset range, the sewage treated by the SBR reactor is sent to a regulating tank for water quality regulation, and then is subjected to secondary electrolysis treatment, air flotation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification in sequence, and then is discharged after security filtration and nanofiltration treatment;
if the COD and/or the ammonia nitrogen content is within a second preset range, sequentially carrying out secondary ABR anaerobic reaction and MBR purification on the sewage treated by the SBR reactor, and then discharging the sewage after security filtration and nanofiltration treatment;
and if the COD and/or the ammonia nitrogen content is within a third preset range, performing MBR purification on the sewage treated by the SBR reactor, and then discharging the sewage after security filtration and nanofiltration treatment.
9. The kitchen waste sewage treatment method according to claim 8, characterized in that: the reaction temperature in the SBR reactor is 33-39 ℃; the treatment time of the sewage in the SBR reactor is 6.5-7.5 days; the aeration time interval is 6-7.5 h, and each aeration time is 3-4 h.
10. The kitchen waste sewage treatment method according to claim 8, characterized in that: the COD content in the first preset range is 2000-4000mg/L, and the ammonia nitrogen content is 200-500 mg/L; in the second preset range, the COD content is 1000-2000mg/L, and the ammonia nitrogen content is 80-200 mg/L; in the third preset range, the COD content is less than 1000mg/L, and the ammonia nitrogen content is less than 80 mg/L.
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