CN112624500B - Kitchen waste sewage treatment system and method - Google Patents

Kitchen waste sewage treatment system and method Download PDF

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Publication number
CN112624500B
CN112624500B CN202011441289.2A CN202011441289A CN112624500B CN 112624500 B CN112624500 B CN 112624500B CN 202011441289 A CN202011441289 A CN 202011441289A CN 112624500 B CN112624500 B CN 112624500B
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tank
sewage
kitchen waste
electrolytic
cod
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CN112624500A (en
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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

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a kitchen waste sewage treatment system and a kitchen waste sewage treatment method. The kitchen waste sewage treatment system comprises a first electrolytic tank, a sedimentation centrifugal tank, an SBR reactor, an adjusting tank, a second electrolytic tank, an air floatation tank, a first-stage ABR reaction tank, a biological contact oxidation tank, a second-stage sedimentation tank, a second-stage ABR reaction tank, an MBR membrane bioreactor, a cartridge filter and a nanofiltration device which are connected in sequence; the SBR reactor is also respectively connected with the secondary ABR anaerobic reaction tank and the MBR membrane bioreactor; and the MBR membrane bioreactor is also connected with the secondary 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 be used for efficiently and stably treating 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 a kitchen waste sewage treatment method.
Background
With the continuous development of urban construction in China, the amount of kitchen waste is increased, and the generated kitchen waste and sewage have great harm to the environment in the kitchen waste treatment process. The kitchen waste sewage mainly refers to waste liquid left after recycling the kitchen waste, and is characterized by containing a large amount of nutrient elements such as nitrogen, phosphorus and the like, and trace elements such as hydrolase, amino acid, organic acid, humic acid, gibberellin and the like; the organic matter concentration is high and the odor is generated; poor biodegradability; the ammonia nitrogen concentration is high, and the ammonia nitrogen concentration accounts for 85% -90% of the total nitrogen. The Chemical Oxygen Demand (COD) in the kitchen waste water is up to 8000-10000mg/L, the ammonia nitrogen concentration is up to 2500mg/L, if the untreated kitchen waste water is directly discharged into the environment, the water body is eutrophicated, and the environment is polluted; if the long-distance conveying treatment is adopted, the construction unit cannot bear high energy consumption and high cost.
At present, kitchen waste and sewage treatment technologies studied at home and abroad can be divided into two types of recycling and harmless treatment. The recycling treatment technology aims at resource utilization, and mainly utilizes concentrated kitchen waste and sewage to prepare a compound biogas slurry fertilizer as an agricultural chemical fertilizer or an organic feed for livestock, but the biogas slurry has large difference and complex composition, and the effect on soil, crops and organisms is still not clear, so that the use of the biogas slurry fertilizer is limited, and therefore, the recycling treatment technology of the kitchen waste and sewage needs to be further researched; the harmless treatment technology aims at reaching the standard of emission and comprises a natural ecological treatment technology and a biochemical treatment technology, and the technology is an effective technology for treating kitchen waste and sewage at present.
Although the biochemical treatment technology has good effect and economy for treating kitchen waste and sewage, because kitchen waste and sewage still possibly contains some residual grease which is not thoroughly separated, in the biological treatment technology, the grease can still be wrapped on the surface of microorganisms to influence the stable operation of the technology, for example, anaerobic sludge can be caused to float upwards and flow out of a reactor in the anaerobic technology, so that the reactor does not have enough sludge quantity to degrade high-concentration organic matters in water; in the aerobic process, organic matters are likely to be difficult to penetrate into the aerobic sludge flocs, the removal effect is affected, and the quality of the effluent water is also deteriorated. In addition, kitchen waste and sewage are complex in water quality, high in water quality fluctuation, extremely high in pollutant concentration, high in effluent indexes COD, SS and the like, so that a biological treatment system is difficult to operate efficiently and stably, and the sewage treatment effect is further affected.
Disclosure of Invention
Aiming at the problems that the existing sewage treatment system is difficult to treat the kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration, the invention provides a kitchen waste and sewage treatment system and a kitchen waste and sewage treatment method.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a kitchen waste sewage treatment system comprises a first electrolytic tank, a sedimentation centrifugal tank, an SBR reactor, an adjusting tank, a second electrolytic tank, an air floatation tank, a first-stage ABR reaction tank, a biological contact oxidation tank, a second-stage ABR reaction tank, an MBR membrane bioreactor, a cartridge filter and a nanofiltration device which are sequentially connected. The first electrolytic cell is provided with a sewage inlet for being connected with a kitchen waste sewage pipeline; the SBR reactor is also respectively connected with the secondary ABR anaerobic reaction tank and the MBR membrane bioreactor; the MBR membrane bioreactor is also connected with the secondary ABR reaction tank; the inside of the SBR reactor and the inside of the MBR membrane bioreactor are respectively provided with a COD detection device and an ammonia nitrogen detection device, which are used for monitoring the COD and/or ammonia nitrogen content in the sewage in real time and ensuring the sewage treatment effect; the regulating tank, the first electrolytic tank, the second electrolytic tank, the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are respectively provided with an aerator; the SBR reactor, the biological contact oxidation tank and the aerator of the MBR membrane bioreactor are respectively connected with a fan through a first heat exchanger, and the first heat exchanger is used for adjusting the temperature of gas fed into the aerator so as to avoid the influence of 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 sewage in the SBR reactor; the inside temperature detector and the pH detector that still are equipped with of SBR reactor for detect the temperature and the pH of sewage respectively, with guaranteeing the smooth going on of SBR reactor internal reaction, guarantee sewage treatment effect.
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 and the sedimentation centrifugal tank, the grease in the sewage in the form of suspended oil, dispersed oil, dissolved oil and emulsion is removed, the SS and part of organic substances in the sewage are reduced, and the subsequent biological treatment process is favorably carried out. The pretreated kitchen waste sewage enters an SBR reactor, and after short-cut nitrification-anaerobic ammonia oxidation-denitrification, the kitchen waste sewage with high concentration of COD and ammonia nitrogen is converted into kitchen waste sewage with lower concentration or low concentration of COD and ammonia nitrogen. The sewage with lower concentration of COD and ammonia nitrogen is filtered by an adjusting 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 cartridge filter and a nanofiltration device and then discharged; the kitchen waste sewage with low concentration of COD and ammonia nitrogen is discharged after being filtered by the secondary ABR reaction tank, the MBR membrane bioreactor, the cartridge filter and the nanofiltration device in sequence or discharged after being filtered by the MBR membrane bioreactor, the cartridge 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, convenient maintenance, low cost and low energy consumption. The system can operate efficiently and stably, has excellent pollutant removal effect on kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration, and meets the emission requirements on effluent indexes COD, SS, ammonia nitrogen and the like.
As another embodiment of the invention, the first electrolytic cell and the second electrolytic cell are internally provided with Fe-C filler, and the primary ABR reaction cell and the secondary ABR reaction cell are internally provided with anaerobic microorganism filler; the biological contact oxidation pond is filled with biological filler.
As another embodiment of the invention, the primary ABR reaction tank and the secondary ABR reaction tank are respectively provided with a submersible stirrer, a guide plate and a sludge reflux pump, so that the full progress of anaerobic reaction and the smooth export of sludge are facilitated.
As another embodiment of the invention, the sedimentation centrifugal tank, the first electrolytic tank, the second electrolytic tank and the air floatation tank are all provided with chemical adding devices; the dosing devices comprise a drug storage barrel, a stirrer and a metering pump; the dosing device of the sedimentation centrifugal tank comprises a PAC dosing device, a PAM dosing device, a PFS dosing device and FeCl 3 The dosing device of the first electrolytic cell and the dosing device of 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 centrifugal tank is provided with a horizontal spiral discharging sedimentation centrifugal machine which is matched with the dosing device to realize flocculation sedimentation centrifugation, remove grease in sewage and reduce SS and partial organic substances in the sewage; the air floatation tank is provided with an air floatation machine, the air floatation machine is connected with the air compressor through the dissolved air tank and the air storage tank, the air floatation machine is a backflow type pressurized dissolved air floatation machine, and the air floatation machine is matched with the PAM dosing device, so that the solid-liquid separation effect is ensured.
As another embodiment of the invention, the first electrolytic tank and the second electrolytic tank are respectively internally provided with a pipeline mixer and a pH detector, so that the pH value of sewage is convenient to control, the electrolytic effect is ensured, COD in the sewage is primarily removed in the first electrolytic tank, and tiny bubbles generated in the electrolytic process are adsorbed on the surfaces of oil drops, so that the oil drops can float on the liquid surface together with the bubbles to realize the separation of oil and water, COD is further removed in the second electrolytic tank, and the possibly residual very small amount of grease is removed.
As another embodiment of the present invention, the aerator in the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor is a spin-mixing aerator.
As another embodiment of the present invention, the aerators in the regulating tank, the first electrolytic tank and the second electrolytic tank are perforated aerators.
As another embodiment of the present invention, the aerators of the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are respectively connected to the first fan via the first heat exchanger, for controlling the outlet air temperature of the aerators; and the adjusting tank, the first electrolytic tank and the aerator of the second electrolytic tank are respectively connected with the second fan.
As another embodiment of the invention, a COD detection device and an ammonia nitrogen detection device are arranged in the sedimentation centrifugal tank and are used for detecting the COD and ammonia nitrogen content of the centrifuged sewage, so that the number and connection relation of the subsequent SBR reactors can be conveniently determined.
As another embodiment of the present invention, the SBR reactor is provided with several groups; the SBR reactors are connected with each other, the SBR reactors and the sedimentation centrifugal tanks and the SBR reactors and the regulating tanks through pipelines provided with electromagnetic valves, so that the SBR reactors are convenient to increase and decrease in number and the conversion of serial-parallel working states, the treatment effect is ensured, and the kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration can be handled.
As another embodiment of the invention, the kitchen waste sewage treatment system further comprises a controller, wherein the controller is respectively connected with the COD detection device and the ammonia nitrogen detection device in the sedimentation centrifugal tank, and is also respectively connected with electromagnetic valves on pipelines among a plurality of groups of SBR reactors, among a plurality of groups of SBR reactors and the sedimentation centrifugal tank and among a plurality of groups of SBR reactors and the regulating tank, and is used for controlling the opening and closing of the electromagnetic valves according to signals of the COD detection device and the ammonia nitrogen detection device, so that the plurality of groups of SBR reactors complete serial-parallel conversion or independent operation, and the adaptability of the system is improved.
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 connected with the sludge tank and used for conveying 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 effluent water after coagulating sedimentation 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 an anaerobic tank and a biogas residue dehydration device, and anaerobic fermentation is performed by utilizing microorganisms in the sludge, thereby being beneficial to reducing cost and energy consumption.
The invention also provides a kitchen waste sewage treatment method, which utilizes the kitchen waste sewage treatment system, and comprises the following steps:
after carrying out electrolytic treatment and flocculation sedimentation centrifugal treatment on kitchen waste and sewage, adopting a segmented water inlet process, sending the kitchen waste and sewage into an SBR reactor for reaction, regulating the sewage temperature by utilizing a first heat exchanger and a second heat exchanger, and detecting COD and ammonia nitrogen content after the reaction is finished;
if the COD and/or ammonia nitrogen content is in the first preset range, the sewage treated by the SBR reactor is sent to an adjusting tank for water quality adjustment, and then secondary electrolytic treatment, air floatation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification are sequentially carried out, and the sewage is discharged after security filtration and nanofiltration treatment;
if the COD and/or ammonia nitrogen content is in the second preset range, sequentially carrying out secondary ABR anaerobic reaction and MBR purification on the sewage treated by the SBR reactor, and discharging after security filtration and nanofiltration treatment;
and if the COD and/or ammonia nitrogen content is in the third preset range, performing MBR purification on the sewage treated by the SBR reactor, and discharging after security filtration and nanofiltration treatment.
Specifically, the MBR membrane bioreactor adopts a split membrane bioreactor to separate the bioreactor from the membrane assembly, the mixed solution of the membrane bioreactor enters the membrane assembly after being pressurized, the liquid in the mixed solution permeates the membrane to obtain system effluent under the action of pressure, and the activated sludge is intercepted and flows back into the MBR bioreactor along with the concentrated solution; intercepting the biologically treated activated sludge and solid matters in the tank by using membrane separation equipment immersed in the aerobic biological tank; the membrane bioreactor can retain microorganisms with longer generation period due to the effective interception effect, can realize the deep purification of sewage, and meanwhile, nitrifying bacteria can sufficiently reproduce in a system, so that the nitrifying effect is obvious, and the membrane bioreactor can provide possibility for deep dephosphorization and denitrification.
Compared with the prior art, the kitchen waste sewage treatment method provided by the invention has the advantages that firstly, 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 centrifugal tank, grease in the sewage in the form of suspended oil, dispersed oil, dissolved oil and emulsion is removed, SS and partial organic matters in the sewage are reduced, then, the pretreated kitchen waste sewage is treated by utilizing the SBR reactor, and the temperature and the aeration time of the reaction process are controlled, so that the kitchen waste sewage after short-range nitrification-anaerobic ammonia oxidation-denitrification is converted into kitchen waste sewage with lower concentration or COD and ammonia nitrogen. If the COD and/or ammonia nitrogen content of the sewage is higher in the first preset range, sending the sewage to an adjusting tank for water quality adjustment, and then sequentially carrying out secondary electrolytic treatment (removing organic pollutants in the sewage and improving biodegradability); air-float separation (solid-liquid separation is realized); primary ABR anaerobic reaction (degradation of macromolecular pollutants, further improvement of biodegradability of sewage); biological contact oxidation (removing organic matters and performing ammonia nitrogen nitrification); secondary sedimentation (removing activated sludge in the biological contact oxidation aerobic section and protecting anaerobic microorganisms in the subsequent anaerobic reactor from impact); the secondary ABR anaerobic reaction (degrading macromolecular pollutants in water again, improving the biodegradability of the wastewater, removing organic matters, performing denitrification) and MBR purification, and discharging after security filtration and nanofiltration treatment. If the COD and/or ammonia nitrogen content of the sewage is low, 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 be used for efficiently and stably treating 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 d; the aeration time interval is 6-7.5 h, the aeration time is 3-4 h each time, the dissolved oxygen is 2.3-2.7 mg/L when aeration is performed, the dissolved oxygen is 0.14-0.7mg/L when no aeration is performed, the smooth proceeding of the shortcut nitrification-anaerobic ammoxidation-denitrification process is ensured, the pH value in the reactor is maintained, and the bacterial 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 200-500mg/L; the COD content in the second preset range 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 of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a connection structure of a kitchen waste sewage treatment system provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a connection structure of a kitchen waste sewage treatment system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a connection structure of a kitchen waste sewage treatment system according to an embodiment of the present invention;
in the figure: 1. a first electrolytic cell; 2. a sedimentation centrifugal pool; 3. an SBR reactor; 4. an adjusting tank; 5. a second electrolytic cell; 6. an air floatation tank; 7. a primary 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 pool; 17. COD detection means; 18. an ammonia nitrogen detection device; 19. an electromagnetic valve; 20. and a controller.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 2, a kitchen waste sewage treatment system provided by the invention will now be described. The kitchen waste sewage treatment system comprises a first electrolytic tank 1, a sedimentation centrifugal tank 2, an SBR reactor 3, an adjusting tank 4, a second electrolytic tank 5, an air floatation tank 6, a primary ABR reaction tank 7, a biological contact oxidation tank 8, a secondary sedimentation tank 9, a secondary ABR reaction tank 10, an MBR membrane bioreactor 11, a security filter and a nanofiltration device 12 which are sequentially connected. The first electrolytic cell 1 is provided with a sewage inlet for being connected with a kitchen waste sewage pipeline; the SBR reactor 3 is also respectively connected with a secondary ABR anaerobic reaction tank 10 and an MBR membrane bioreactor 11; the MBR membrane bioreactor 11 is also connected with the secondary ABR reaction tank 10; the inside of the SBR reactor 3 and the inside of the MBR membrane bioreactor 11 are respectively provided with a COD detection device and an ammonia nitrogen detection device, and the COD detection device and the ammonia nitrogen detection device are used for monitoring the content of COD and ammonia nitrogen in real time; 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 are respectively provided with an aerator; 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 the second heat exchanger 15 and is used for adjusting the temperature of sewage in the SBR reactor 3; the inside of the SBR reactor 3 is also 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, the grease in the sewage in the form of suspended oil, dispersed oil, dissolved oil and emulsion is removed, and SS and part of organic substances in the sewage are reduced, so that the subsequent biological treatment process can be smoothly carried out. The pretreated kitchen waste sewage enters an SBR reactor 3, and after short-cut nitrification-anaerobic ammonia oxidation-denitrification, the kitchen waste sewage with high concentration of COD and ammonia nitrogen is converted into kitchen waste sewage with lower concentration or low concentration of COD and ammonia nitrogen. The sewage with lower concentration of COD and ammonia nitrogen is discharged after being filtered by an adjusting tank 4, a second electrolytic tank 5, an air floatation tank 6, a primary ABR reaction tank 7, a biological contact oxidation tank 8, a secondary sedimentation tank 9, a secondary ABR reaction tank 10, an MBR membrane bioreactor 11, a cartridge filter 12 and a nanofiltration device 13 in sequence; the kitchen waste sewage with low concentration of COD and ammonia nitrogen is discharged after being filtered by the secondary ABR reaction tank 10, the MBR membrane bioreactor 11, the cartridge filter 12 and the nanofiltration device 13 in sequence or discharged after being filtered by the MBR membrane bioreactor 11, the cartridge 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, convenient maintenance, low cost and low energy consumption. The system can operate efficiently and stably, has excellent pollutant removal effect on kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration, and can treat kitchen waste and sewage with COD as high as 8000-12000mg/L and ammonia nitrogen concentration as high as about 2500-3500 mg/L.
As a specific embodiment of the kitchen waste sewage treatment system provided by the invention, referring 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 floatation tank 6 are connected with the 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 cell 1 and the second electrolytic cell 5 and are used for removing organic pollutants and improving biodegradability; anaerobic microbial fillers are arranged in the primary ABR reaction tank 7 and the secondary ABR reaction tank 10 and used for degrading macromolecular pollutants in water, improving the biodegradability of sewage and removing part of pollutants; the biological contact oxidation pond 8 is filled with biological filler for removing organic matters and performing ammonia nitrogen nitrification.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, the primary ABR reaction tank 7 and the secondary ABR reaction tank 9 are respectively internally provided with a submersible stirrer, a guide plate and a sludge reflux pump, so that the full execution of anaerobic reaction and the smooth export of sludge are facilitated.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, a sedimentation centrifugal tank 2, a first electrolytic tank 1, a second electrolytic tank 5 and an air floatation tank 6 are all provided with chemical adding devices; the dosing devices comprise a drug storage barrel, a stirrer and a metering pump; the dosing device of the sedimentation centrifugal tank 2 comprises a PAC dosing device, a PAM dosing device, a PFS dosing device and FeCl 3 The dosing device is matched with a centrifugal machine to cooperate with the first electrolytic cell 1 to achieve the aim of removing grease, and the dosing devices of the first electrolytic cell 1 and the second electrolytic cell 5 are HCl dosing devices; the dosing device of the air floatation tank 6 is a PAM dosing device.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, the sedimentation centrifugal tank 2 is provided with a horizontal spiral discharging sedimentation centrifugal machine, a PAC dosing device and a PAM dosing deviceDevice, PFS dosing device and FeCl 3 The dosing devices are matched with each other to realize flocculation precipitation centrifugation, so that grease in the sewage is removed, and SS and part of organic substances in the sewage are reduced; the air floatation tank 6 is provided with an air floatation machine, the air floatation machine is connected with the air compressor through a dissolved air tank and an air storage tank, the air floatation machine is a backflow type pressurized dissolved air floatation machine, and the air floatation machine is matched with the 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, the first electrolytic tank 1 and the second electrolytic tank 5 are internally provided with the pipeline mixer and the pH detector, so that the pH value of sewage is conveniently controlled, the electrolytic effect is ensured, and tiny bubbles generated in the electrolytic process are adsorbed on the surfaces of oil drops while the pollutants in the sewage are primarily removed in the first electrolytic tank 1, so that the oil drops can float on the liquid surface together with the bubbles to realize the separation of oil and water, the pollutants are further removed in the second electrolytic tank 5, and the possible residual tiny amount of grease is removed.
As a specific implementation mode of the kitchen waste sewage treatment system provided by the invention, the 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 implementation mode 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 implementation mode of the kitchen waste sewage treatment system provided by the invention, the SBR reactor 3, the biological contact oxidation tank 8 and the aerator of the MBR membrane bioreactor 11 are respectively connected with a first fan through a first heat exchanger 14 and are used for controlling the temperature of the air discharged by the aerator; the adjusting tank 4, the first electrolytic tank 1 and the aerator of the second electrolytic tank 5 are respectively connected with a second fan.
As a specific implementation manner of the kitchen waste sewage treatment system provided by the invention, referring to fig. 2, a COD detection device 17 and an ammonia nitrogen detection device 18 are arranged in the sedimentation centrifugal tank 2, and are used for detecting the COD and ammonia nitrogen content of the centrifuged sewage, so as to facilitate the determination of the number and connection relationship of the following SBR reactors 3.
As a specific embodiment of the kitchen waste sewage treatment system provided by the invention, referring to fig. 3, 3 groups of sbr reactors 3 are provided; the SBR reactors 3 of the 3 groups are connected with each other, the SBR reactors 3 and the sedimentation centrifugal tank 2 and the SBR reactors 3 and the regulating tank 4 through pipelines provided with electromagnetic valves 19, so that the quantity of the SBR reactors 3 is increased or decreased and the serial-parallel working state is converted conveniently, the treatment effect is ensured, and the kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration can be handled.
As a specific implementation manner of the kitchen waste sewage treatment system provided by the invention, referring to fig. 3, the kitchen waste sewage treatment system further comprises a controller 20, the controller 20 is respectively and electrically connected with a COD detection device 17 and an ammonia nitrogen detection device 18 in the sedimentation centrifugal tank 2, and also respectively and electrically connected with electromagnetic valves 19 on pipelines between the SBR reactors 3, between the SBR reactors 3 and the sedimentation centrifugal tank 2 and between the SBR reactors 3 and the regulating tank 4, and is used for controlling the opening and closing of the electromagnetic valves according to signals of the COD detection device and the ammonia nitrogen detection device, so that a plurality of groups of SBR reactors complete serial-parallel conversion or independent operation, the adaptability of the system is improved, when the COD and ammonia nitrogen content of sewage in the sedimentation centrifugal tank 2 is extremely high (exceeds a preset value), the controller 20 controls the opening and closing of the electromagnetic valves, so that the SBR reactors 3 are in series operation, and the treatment effect is ensured; when the COD and ammonia nitrogen content of the sewage in the sedimentation centrifugal tank 2 is low (lower than a preset value), the controller 20 controls the opening and closing of the electromagnetic valve, so that the SBR reactor 3 works independently or in parallel, the treatment of high-concentration kitchen waste sewage can be met, the low-concentration kitchen waste sewage 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 is further illustrated by the embodiment.
Example 1
A kitchen waste sewage treatment method comprises the following steps:
delivering kitchen waste sewage (COD content is 11520mg/L and ammonia nitrogen content is 3205 mg/L) into a first electrolytic cell 1 for electrolytic treatmentFeeding into a sedimentation centrifugal tank 2, adding PAC, PAM, PFS and FeCl 3 Performing flocculation sedimentation centrifugal treatment, then, adopting a segmented water inlet process, sending the wastewater into an SBR reactor 3 for reaction, wherein the aeration time interval is 6 hours, the aeration time is 4 hours each time, the temperature of the wastewater is controlled to be 36 ℃ by utilizing a first heat exchanger 14 and a second heat exchanger 15, the treatment time of the wastewater in the SBR reactor 3 is 7 days, and after the treatment is finished, detecting COD and ammonia nitrogen content, wherein the COD content is 2413mg/L, and the ammonia nitrogen content is 252mg/L;
the sewage treated by the SBR reactor 3 is sent into a regulating tank 4 for water quality regulation, and then secondary electrolytic treatment, air flotation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary sedimentation, secondary ABR anaerobic reaction and MBR purification are sequentially carried out, and after safe filtration and nanofiltration treatment, finally the sewage is discharged after reaching the standard, concentrated water after being cleaned by a nanofiltration device 13 enters a concentrated water tank, effluent after coagulating sedimentation enters a Fenton reaction tank, and the effluent is sent into 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 FeCl 3 10Kg, the annual loss rate of Fe-C filler is 10%,
the results of the water quality of the sewage preliminarily treated by the above method are shown in the following Table 1.
Figure BDA0002830391720000121
Example 2
The kitchen waste sewage treatment method, which utilizes the kitchen waste sewage treatment system, comprises the following steps:
delivering kitchen waste sewage (COD content is 8123mg/L and ammonia nitrogen content is 2564 mg/L) into a first electrolytic tank 1 for electrolytic treatment, delivering into a sedimentation centrifugal tank 2, and adding PAC, PAM, PFS and FeCl 3 Performing flocculation sedimentation centrifugal treatment, then adopting a segmented water inlet process, sending into an SBR reactor 3 for reaction, wherein the aeration time interval is 7.5h, the aeration time is 3h each time, and the first heat exchanger 14 and the second heat exchanger 15 are used for controlling the sewage temperature to 39 ℃ and treating sewage in the SBR reactorThe time is 6.5d, and after the treatment is finished, the COD and ammonia nitrogen content are detected, the COD content is 1108mg/L, and the ammonia nitrogen content is 221mg/L;
and (3) 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, finally discharging after reaching standards, enabling the concentrated water cleaned by the nanofiltration device 13 to enter a concentrated water tank, enabling the effluent after coagulating sedimentation to enter a Fenton reaction tank, and carrying out treatment on the effluent by the Fenton reaction tank and then sending the effluent to the regulating tank 4 for recycling.
Wherein, each ton of sewage consumes 10Kg of PFS, 14.5Kg of PAC, 3.2Kg of PAM, 2.8Kg of HCL and FeCl 3 10Kg, the annual loss rate of Fe-C filler is 10%,
the sewage water quality preliminarily treated by the above method reaches the results shown in the following Table 2.
Figure BDA0002830391720000131
As can be seen from the data, the sewage treated by the method can well meet the three-level standard (CODcr: 500mg/L; BOD) in GB8978-1996 integrated wastewater discharge Standard 5 :300 mg/L), in particular the suspended solids SS content has met the first standard requirement (SS: 70 mg/L).
In order to better illustrate the technical solutions of the present invention, the following is further compared with examples 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 and ammonia nitrogen content is 3205 mg/L) into a first electrolytic tank 1 for electrolytic treatment, delivering into a sedimentation centrifugal tank 2, and adding PAC, PAM, PFS and FeCl 3 Performing flocculation sedimentation centrifugal treatment;
and delivering the sewage after centrifugal treatment into a regulating tank 4 for water quality regulation, and then sequentially carrying out secondary electrolytic treatment, air floatation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary sedimentation, secondary ABR anaerobic reaction and MBR purification, and carrying out security filtration and nanofiltration treatment, wherein the sewage after detection treatment fails to reach the standard.
Wherein, each ton of sewage consumes 15Kg of PFS, 18Kg of PAC, 5Kg of PAM, 6Kg of HCl and FeCl 3 12Kg，
The results of the water quality of the sewage primarily treated by the above method are shown in the following table 3:
Figure BDA0002830391720000141
comparative example 2
A kitchen waste sewage treatment method comprises the following steps:
delivering kitchen waste sewage (COD content is 11520mg/L and ammonia nitrogen content is 3205 mg/L) into a first electrolytic tank for electrolytic treatment, delivering into a coagulation tank, and adding MgCl 2 、Na 2 HPO 4 PAC and PAM are separated by precipitation, and then are sent into an SBR reactor for reaction by adopting a segmented water inlet process, the aeration time interval is 6 hours, the aeration time is 4 hours each time, 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 7 days, and after the treatment is finished, COD and ammonia nitrogen content are detected, the COD content is 3154mg/L, and the ammonia nitrogen content is 553mg/L;
the sewage treated by the SBR reactor is sent into a regulating tank 4 for water quality regulation, and then secondary electrolytic treatment, air floatation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary sedimentation, secondary ABR anaerobic reaction and MBR purification are sequentially carried out, the sewage quality is detected through security filtration and nanofiltration treatment, 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 is sent into the regulating tank 4 for recycling after being treated by the Fenton reaction tank.
Wherein, each ton of sewage consumes 20Kg of PAC, 5Kg of PAM, 5Kg of HCl and 5Kg of MgCl 2 12Kg、Na 2 HPO 4 6Kg，
The results of the water quality of the sewage preliminarily treated by the above method are shown in Table 4 below.
Figure BDA0002830391720000142
From the data, the kitchen waste sewage treatment method provided by the invention can be used for pretreating kitchen waste sewage by utilizing the electrolysis effect of the first electrolytic tank and the flocculation sedimentation centrifugation effect of the sedimentation centrifugal tank, so that the grease in the sewage in the form of suspended oil, dispersed oil, dissolved oil and emulsion can be effectively removed, SS and part of organic substances in the sewage are reduced, and the stability of the SBR reactor is guaranteed. And then the pretreated kitchen waste water is treated by utilizing the SBR reactor, so that the kitchen waste water with high concentration is converted into sewage with low concentration or sewage with low concentration, and the stable and smooth proceeding of the subsequent procedures is ensured. The method has the advantages of reliable and efficient process, strong adaptability, and capability of efficiently and stably treating kitchen waste and sewage with complex water quality, large water quality fluctuation and extremely high pollutant concentration.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.

Claims (10)

1. A kitchen garbage sewage treatment system which characterized in that: comprises a first electrolytic tank, a sedimentation centrifugal tank, an SBR reactor, an adjusting tank, a second electrolytic tank, an air floatation tank, a first-stage ABR reaction tank, a biological contact oxidation tank, a second-stage ABR reaction tank, an MBR membrane bioreactor, a cartridge filter and a nanofiltration device which are connected in sequence;
the first electrolytic cell is provided with a sewage inlet for being connected with a kitchen waste sewage pipeline;
the SBR reactor is also respectively connected with the secondary ABR reaction tank and the MBR membrane bioreactor; the outlet of the MBR membrane bioreactor is also connected with the inlet of the secondary ABR reaction tank; the inside of the SBR reactor and the inside of the MBR membrane bioreactor are respectively provided with a COD detection device and an ammonia nitrogen detection device;
the regulating tank, the first electrolytic tank, the second electrolytic tank, the SBR reactor, the biological contact oxidation tank and the MBR membrane bioreactor are respectively provided with an aerator; the SBR reactor, the biological contact oxidation tank and the aerator of the MBR membrane bioreactor are respectively connected with a fan through a first heat exchanger, and the first heat exchanger is used for adjusting the temperature of gas sent into the aerator so as to avoid fluctuation of the sewage temperature;
the SBR reactor is communicated with the second heat exchanger and is used for adjusting the temperature of sewage in the SBR reactor; 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;
the sedimentation centrifugal tank is internally provided with a dosing device, and the dosing device comprises a PAC dosing device, a PAM dosing device, a PFS dosing device and FeCl 3 And a dosing device.
2. The kitchen waste sewage treatment system according to claim 1, wherein: fe-C filler is arranged in each of the first electrolytic tank and the second electrolytic tank, and anaerobic microorganism filler is arranged in each of the first-stage ABR reaction tank and the second-stage ABR reaction tank; the biological contact oxidation pond is filled with biological filler.
3. The kitchen waste sewage treatment system according to claim 2, wherein: the sedimentation centrifugal tank, the first electrolytic tank, the second electrolytic tank and the air floatation tank are all provided with chemical adding devices; the dosing devices comprise a drug storage barrel, a stirrer and a metering pump; the 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.
4. A kitchen waste sewage treatment system as claimed in any one of claims 1 to 3, wherein: and a COD (chemical oxygen demand) detection device and an ammonia nitrogen detection device are arranged in the sedimentation centrifugal tank.
5. The kitchen waste sewage treatment system according to claim 4, wherein: the SBR reactor is provided with a plurality of groups; the SBR reactors are connected through pipelines provided with electromagnetic valves.
6. The kitchen waste sewage treatment system according to claim 5, wherein: the device comprises a sedimentation centrifugal tank, a plurality of SBR reactors, a plurality of groups of SBR reactors, a controller, a plurality of groups of electromagnetic valves, and a plurality of groups of electromagnetic valves, wherein the controller is respectively connected with the COD detection device and the ammonia nitrogen detection device in the sedimentation centrifugal tank, the controller is also respectively connected with the electromagnetic valves on pipelines among the SBR reactors, among the sedimentation centrifugal tank and among the SBR reactors and among the regulating tanks, and the controller is used for controlling the opening and closing of the electromagnetic valves according to signals transmitted by the COD detection device and the ammonia nitrogen detection device so that the SBR reactors are in series-parallel connection conversion.
7. The kitchen waste sewage treatment system according to claim 1, wherein: the device also comprises a sludge pool;
the sedimentation centrifugal tank, the secondary sedimentation tank, the primary ABR reaction tank, the secondary ABR reaction tank and the air floatation tank are connected with the sludge tank and used for conveying 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:
after carrying out electrolytic treatment and flocculation sedimentation centrifugal treatment on kitchen waste and sewage, adopting a segmented water inlet process, sending the kitchen waste and sewage into an SBR reactor for reaction, regulating the sewage temperature by utilizing a first heat exchanger and a second heat exchanger, and detecting COD and ammonia nitrogen content after the reaction is finished;
if the COD and/or ammonia nitrogen content is in the first preset range, the sewage treated by the SBR reactor is sent to an adjusting tank for water quality adjustment, and then secondary electrolytic treatment, air floatation separation, primary ABR anaerobic reaction, biological contact oxidation, secondary precipitation, secondary ABR anaerobic reaction and MBR purification are sequentially carried out, and the sewage is discharged after security filtration and nanofiltration treatment;
if the COD and/or ammonia nitrogen content is in the second preset range, sequentially carrying out secondary ABR anaerobic reaction and MBR purification on the sewage treated by the SBR reactor, and discharging after security filtration and nanofiltration treatment;
and if the COD and/or ammonia nitrogen content is in the third preset range, performing MBR purification on the sewage treated by the SBR reactor, and discharging after security filtration and nanofiltration treatment.
9. The kitchen waste sewage treatment method according to claim 8, wherein: 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 d; the aeration time interval is 6-7.5 h, and the aeration time is 3-4 h each time.
10. The kitchen waste sewage treatment method according to claim 8, wherein: the COD content in the first preset range is 2000-4000mg/L, and the ammonia nitrogen content is 200-500mg/L; the COD content in the second preset range 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 80mg/L.
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