CN112299653A - Efficient denitrification treatment method for kitchen wastewater - Google Patents
Efficient denitrification treatment method for kitchen wastewater Download PDFInfo
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/5281—Installations for water purification using chemical agents
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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
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- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
The invention discloses a high-efficiency denitrification treatment method of kitchen wastewater; the method comprises the following steps: 1. pretreating kitchen waste water; 2. inputting the kitchen wastewater into a first-stage anoxic tank, mixing the kitchen wastewater with sludge refluxed from a membrane tank and mixed liquid refluxed from a first-stage aerobic tank, and performing denitrification reaction; 3. the kitchen wastewater enters the first-stage aerobic tank, most organic matters are removed through aeration, and nitration reaction is realized; 4. the kitchen wastewater enters the next stage of the anoxic tank, and denitrification reaction is continuously carried out on the residual nitrate nitrogen; 5. repeatedly executing the step 2 to the step 4, and treating the kitchen wastewater through a multi-stage anoxic tank and a corresponding aerobic tank; step 6, allowing the kitchen wastewater to enter a membrane pool, and further degrading the residual organic matters; and 7, putting the kitchen wastewater treated by the membrane pool into a clean water pool. The application of the invention can fully ensure the stable, efficient and reliable operation of the denitrification treatment process of the kitchen wastewater.
Description
Technical Field
The invention relates to the technical field of kitchen wastewater treatment, in particular to a high-efficiency denitrification treatment method for kitchen wastewater.
Background
With the rapid development of economy and the continuous increase of population, the pollution condition of water resources is increasingly serious. The kitchen waste water is taken as common waste water, the annual output is also continuously increased, the kitchen waste water is mainly waste water generated by processing kitchen waste, and the kitchen waste water has the main characteristics of complex water quality, high chemical oxygen demand, high oil content, high ammonia nitrogen, high phosphorus and the like, so that the kitchen waste water can cause serious pollution to the ecological environment without being strictly processed.
However, because the kitchen waste wastewater has complex water quality, large water quality fluctuation and high pollution degree, higher challenges are provided for development and research of treatment technology, and the treatment methods for the kitchen waste wastewater mainly comprise a physical treatment method, a chemical treatment method, a physicochemical treatment method, a land treatment method and a biological treatment method at present.
In practical application, the ammonia nitrogen and TN in the kitchen wastewater are high, the TN concentration is generally 3000-4000mg/L, and the treatment of the high-concentration ammonia nitrogen kitchen wastewater is a difficult point. Physical treatments have limited removal of contaminants, often applied as a pretreatment; the chemical treatment method needs to add a large amount of medicament, has higher cost and is easy to cause secondary pollution; the physical and chemical treatment methods comprise catalytic oxidation, incineration, electrochemistry and the like, and the treatment cost is high; the land treatment method has long period and has certain risk on soil safety; the biological treatment method is the most widely applied method at present, ammonia nitrogen and total nitrogen in wastewater are removed by adopting a biological denitrification mode at present, however, the biological treatment is greatly influenced by external environment, and the stable operation of the system is influenced by water quality fluctuation, the inhibition effect of high ammonia nitrogen on microorganisms and the like.
Therefore, how to carry out denitrification treatment on the kitchen wastewater with high efficiency, low energy consumption, economy and convenience becomes a technical problem which needs to be solved by technical personnel in the field urgently.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a high-efficiency denitrification treatment method for kitchen wastewater, which aims to fully ensure the stable, high-efficiency and reliable operation of a denitrification treatment process for the kitchen wastewater.
In order to realize the aim, the invention discloses a high-efficiency denitrification treatment method for kitchen wastewater; the method comprises the following steps:
step 1, pretreating kitchen wastewater; the pretreatment uses a physical treatment method to remove grease and large suspended particles in the wastewater;
step 2, inputting the kitchen wastewater after pretreatment into a first-stage anoxic tank, mixing the kitchen wastewater with sludge refluxed from a membrane tank and mixed liquid refluxed from a first-stage aerobic tank, and providing nitrate nitrogen from a reflux system from the first-stage aerobic tank to the first-stage anoxic tank to perform denitrification reaction;
step 3, the kitchen wastewater subjected to nitration reaction in the first-stage anoxic tank enters the first-stage aerobic tank from the effluent of the first-stage anoxic tank, and most organic matters are removed through aeration to realize nitration reaction;
step 4, the kitchen wastewater aerated in the first-stage aerobic tank enters the next-stage anoxic tank from the effluent of the first-stage aerobic tank, and the denitrification reaction is continuously carried out on the residual nitrate nitrogen;
step 5, repeatedly executing the step 2 to the step 4, and enabling the kitchen wastewater to be processed by the multistage anoxic tank and the corresponding aerobic tank;
step 6, enabling the kitchen wastewater treated by the multistage anoxic tank and the corresponding aerobic tank to flow into a membrane tank, and further degrading residual organic matters;
the membrane tank is provided with a sludge reflux pump;
the sludge reflux pump is used for refluxing the sludge in the membrane tank to the first-stage anoxic tank;
the returned sludge is mixed with the pretreated kitchen wastewater and then diluted in the first-stage anoxic tank, so that the ammonia nitrogen concentration in the first-stage anoxic tank is reduced;
discharging the residual sludge in the membrane tank into a sludge tank;
and 7, putting the kitchen wastewater treated by the membrane pool into a clean water pool.
Preferably, each anoxic tank is hydraulically stirred by adopting internal reflux jet flow.
More preferably, the bottom of each anoxic pond is provided with an ejector;
the jet pump of each jet device is used for injecting the nitrified liquid at the tail end of the aerobic pool in the same stage into the jet device of the corresponding anoxic pool;
each anoxic pond realizes the complete mixing in the anoxic pond through the powerful hydraulic disturbance effect of the corresponding ejector;
each anoxic tank is provided with a fixed bed flat plate filler.
More preferably, the reflux quantity of the ejector for injecting the tail end nitrified liquid of the aerobic pool in the same stage into the corresponding anoxic pool by each jet pump is 100-300% of the treated water quantity
Preferably, each aerobic pool is provided with a novel fixed ionic enzymatic suspended filler.
More preferably, the surface of the filler film of each novel fixed ionic enzymatic suspended filler is fixed with growth microorganisms.
More preferably, each aerobic tank adopts a jet aerator and micropore aeration combined mode to supply oxygen by water feeding aeration;
each jet aerator is provided with a corresponding jet water pump and is of an air supply type;
air for aerating each jet aerator and the corresponding micropore is provided by a blower.
Preferably, the multistage anoxic tanks and the corresponding aerobic tanks are connected in series.
Preferably, the membrane pools are all provided with an ultrafiltration membrane bioreactor; the ultrafiltration membrane bioreactor is used for solid-liquid separation; and discharging the kitchen wastewater treated in each membrane pool from one side of the membrane pool.
Preferably, an automatic water-producing backwashing system and a dosing system are arranged in the membrane tank, and an ultraviolet sterilizer is arranged at a water outlet;
the sludge reflux amount in the membrane tank is 100 to 200 percent;
the membrane tank is provided with a function of discharging the residual sludge at regular time; performing sludge dewatering treatment on the discharged sludge;
the membrane tank is provided with a plurality of dosing systems;
the plurality of drug adding systems comprise a PAC drug adding system, an acid washing drug adding system and an alkali washing drug adding system;
the reagent of the acid-washing medicine-adding system is citric acid;
the reagent of the alkali washing medicine adding system is the mixture of sodium hydroxide and sodium hypochlorite;
each medicine adding system is provided with a medicine dissolving box, a stirrer and a medicine adding pump.
The invention has the beneficial effects that:
the system has good treatment effect and strong impact load resistance. The multi-stage AO process series connection is adopted, sewage is firstly subjected to denitrification in an anoxic tank, then enters a subsequent aerobic tank to oxidize ammonia nitrogen, and mixed nitrified liquid enters a next-stage reactor, so that the nitrified liquid backflow process can be effectively reduced, the operation cost is reduced, and the method is particularly suitable for treatment of high ammonia nitrogen wastewater. The multistage AO process adopts an intermittent aeration mode to lead microorganisms to grow under the alternate change of anoxic and aerobic conditions, so that the biological activity is excited, the short-range nitrification is promoted, the biological denitrification efficiency is enhanced, the treatment efficiency is greatly improved, the nitrification rate can be improved by more than 20 percent compared with the traditional process and can reach 0.3kgNH 3-N/kgMLSS.d, and the denitrification rate can reach 1kgNO 3-N/kgMLSS.d. Meanwhile, the anaerobic environment and the aerobic environment are alternated, so that the growth of a large number of filamentous fungi is limited, and the phenomenon of sludge bulking is rarely caused.
The invention has high oxygen mass transfer efficiency and good mass transfer effect. The anoxic tank is stirred in a jet flow mode, and meanwhile, the inlet water of the jet flow comes from the nitrifying liquid at the tail end of the aerobic tank, so that the reflux of the nitrifying liquid can be replaced, and the energy consumption is effectively reduced; the special fixed bed flat plate packing is arranged in the aerobic tank, the sludge concentration in the aerobic tank is increased, the output of the residual sludge in the treatment process is small, in addition, the oxygen supply is realized in the form of jet aeration and micropore aeration in the aerobic tank, and compared with the traditional aeration, the jet aerator has the advantages of long service life, difficult damage, high oxygen mass transfer efficiency and further improved treatment efficiency of the equipment.
The invention has good solid-liquid separation effect and low residual sludge yield. The MBR membrane system is used for replacing a traditional sedimentation tank, the sewage can be subjected to solid-liquid separation by the physical interception capacity of the membrane, most of suspended matters, organic matters and bacteria are separated, the MBR membrane system is used as a sewage advanced treatment part, the effluent quality is stable, the treatment effect is good, the effluent can be directly recycled, the dominant bacteria have strong reproductive capacity in a reactor, the sludge concentration is 5-10 times that of the traditional process, the sludge load is increased, the volume load is larger, and the impact resistance is improved. Due to the functional separation of the membrane unit and the biological reaction unit, the HRT and the SRT of the MBR system can be flexibly controlled and are convenient to manage.
The invention has small floor area and low investment and operation cost. The use of the enzyme floating filler and the function of the membrane for intercepting the microorganism lead the sludge content in the system to be far higher than that of the conventional biochemical system, the corresponding volume load is obviously improved, the volume of the tank body can be correspondingly reduced, and compared with the traditional denitrification process, the capital investment of the invention is saved by more than 30 percent.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 shows a flow chart of an embodiment of the present invention.
Detailed Description
Example 1
As shown in figure 1, a high-efficiency denitrification treatment method for kitchen wastewater; the method comprises the following steps:
step 1, pretreating kitchen wastewater; the pretreatment uses a physical treatment method to remove grease and large suspended particles in the wastewater;
step 2, inputting the kitchen wastewater after pretreatment into a first-stage anoxic tank, mixing the kitchen wastewater with sludge refluxed from a membrane tank and mixed liquid refluxed from a first-stage aerobic tank, and providing nitrate nitrogen from the first-stage aerobic tank to a reflux system of the first-stage anoxic tank to perform denitrification reaction;
step 3, enabling the kitchen wastewater subjected to the nitration reaction in the first-stage anoxic tank to flow out of the first-stage anoxic tank and enter a first-stage aerobic tank, and removing most organic matters through aeration to realize the nitration reaction;
step 4, the kitchen wastewater aerated in the first-stage aerobic tank flows out of the first-stage aerobic tank and enters a next-stage anoxic tank, and denitrification reaction is continuously carried out on the residual nitrate nitrogen;
step 5, repeatedly executing the step 2 to the step 4, and treating the kitchen wastewater through a multi-stage anoxic tank and a corresponding aerobic tank;
under the metabolic action of aerobic microorganisms, macromolecular organic pollutants are degraded into substances with small molecular weight; the multi-stage AO process combines the characteristics of the AO process and an unsteady state theory, so that microorganisms grow under the condition of oxygen deficiency and aerobic condition, the biological activity is stimulated, the short-range nitrification is promoted, the biological denitrification efficiency is enhanced, and the treatment efficiency is greatly improved. Meanwhile, the anaerobic environment and the aerobic environment are alternated, so that the growth of a large number of filamentous fungi is limited, and the phenomenon of sludge bulking is rarely caused.
Step 6, enabling the kitchen wastewater effluent treated by the multistage anoxic tank and the corresponding aerobic tank to enter a membrane tank, and further degrading the residual organic matters;
the membrane tank is provided with a sludge reflux pump;
the sludge reflux pump is used for refluxing the sludge in the membrane tank to the first-stage anoxic tank;
the returned sludge is mixed with the pretreated kitchen wastewater and then diluted in the first-stage anoxic tank, so that the ammonia nitrogen concentration in the first-stage anoxic tank is reduced;
discharging the residual sludge in the membrane tank into a sludge tank;
the returned sludge is used for strengthening the denitrification efficiency of the whole system and the balance of sludge concentration, and effectively relieving the inhibition effect of high ammonia nitrogen on the growth of microorganisms.
And 7, putting the kitchen wastewater treated by the membrane pool into a clean water pool.
The method combines the multi-stage AO process and MBR solid-liquid separation treatment, removes various pollutants in the kitchen wastewater through the action of high-efficiency microorganisms, particularly realizes high-efficiency denitrification, combines the advantages of microorganism immobilization, combined jet aeration and membrane interception technologies, fully ensures stable, high-efficiency and reliable process operation, and has the following specific principle:
the aerobic tank degrades organic matters by means of a biological film fixed on the surface of the novel enzyme floating filler and suspended activated sludge together, the number of effective microorganisms in the reaction tank is greatly increased, the biochemical treatment capacity is obviously increased, and meanwhile, the addition of the enzyme floating filler enables the environment where the microorganisms live to be converted from the original gas phase and liquid phase into the gas phase, liquid phase and solid phase, so that the conversion into the microorganisms creates a richer existence form and forms a more complex combined type ecosystem which is mutually associated in the longitudinal direction and the transverse direction. Longitudinally, microorganisms constitute a complex chain of organisms consisting of multiple trophic levels of bacteria, fungi, algae, protozoa, metazoans, and the like. In the transverse direction, along the direction from the liquid to the carrier, a suspended aerobic type, an attached facultative type and an attached anaerobic type microorganism system with various respiratory types and nutritional types is formed, so that the system can simultaneously complete the tasks of removing organic matters and synchronously nitrifying and denitrifying.
The combined jet aeration integrates the current technologies of high-speed jet aeration, phase strengthening transfer, turbulent flow shearing and the like, a circulating water pump is used for lifting high-pressure water to flow through a spray nozzle and inject the high-pressure water into a reactor, a large amount of air is sucked simultaneously under the action of negative pressure, a high-speed turbulent flow shearing area is formed below the spray nozzle under the combined action of water flow and air flow, the sucked air is dispersed into fine bubbles, mixed sewage rich in dissolved oxygen flows upwards and returns to the bottom of the reactor through a guide cylinder to form circular flow, then the circular flow is sheared and downwards jetted, the circular reciprocating operation is carried out, the sewage is repeatedly oxygenated, the bubbles and microbial colonies are continuously sheared and refined, and fine and compact floccules are formed. Meanwhile, the combined micro-pore aeration has the advantages of high oxygen utilization rate in the aerobic tank, good mass transfer effect and high treatment efficiency.
The membrane interception technology is used for solid-liquid separation, almost all microorganisms are intercepted by the membrane, so that the sludge concentration in the system is far higher than that of a conventional activated sludge method and a biofilm method, the organic load is obviously improved, and meanwhile, microorganisms with functions of ammonia oxidizing bacteria, nitrifying bacteria and the like are enriched to a great extent, so that a good ammonia nitrogen removal effect is further ensured.
In certain embodiments, each anoxic tank is hydraulically agitated with an internal reflux jet.
In some embodiments, the bottom of each anoxic tank is provided with an ejector;
the jet pump of each jet device is used for injecting the nitrified liquid at the tail end of the aerobic pool in the same stage into the jet device of the corresponding anoxic pool;
each anoxic tank realizes complete mixing in the anoxic tank through the powerful hydraulic disturbance effect of the corresponding ejector;
each anoxic tank is provided with fixed bed flat plate packing.
The filler is an ionic enzymatic suspended filler, and the surface of the filler is positively charged due to modification of an ionized material and blending modification of hydrophilic polymers in the processing process of the filler, so that the process of attaching and fixing microorganisms on the surface of a carrier is easier to perform, the sludge concentration of an anoxic tank is improved, and the biochemical treatment effect is effectively improved.
Because the existence of the fixed bed flat plate packing also realizes the synchronous nitration and denitrification reaction, more than 80 percent of total nitrogen is removed in the first section AO.
In some embodiments, the reflux amount of the end nitrifying liquid of the aerobic pool in the same stage injected into the corresponding ejector of the anoxic pool by each jet pump is 100-300%.
In certain embodiments, each aerobic tank is provided with a novel fixed ionic enzymatic suspension packing.
In certain embodiments, the surface of the filler film of each of the novel fixed ionic enzymatic suspension fillers is fixed with growing microorganisms.
The process of microorganism adhesion and fixation on the surface of the carrier is easier to carry out, and the effect of the microorganism on treating pollutants is obviously improved.
The novel fixed ionic enzymatic suspended filler, namely the enzymatic suspended filler, is processed and formed by adopting a series of processes, so that the special structures of a 'double-layer film' and a 'void layer' of the filler are realized, and the characteristics of large specific surface area and high porosity are realized.
The enzyme floating filler is modified by an ionized material and blended and modified by hydrophilic macromolecules in the processing process, and the surface of the enzyme floating filler is positively charged, so that the process of attaching and fixing microorganisms on the surface of a carrier is easier to carry out. The enzyme floating filler has better mechanical strength on the premise of ensuring large specific surface area. No breakage occurs during the hydraulic shearing action and the frictional collision between the carriers.
As the modified high polymer material is mainly used as the base material in the production process, the modified high polymer material has the advantages of acid resistance, alkali resistance, better adaptability to high-difficulty sewage containing organic matters (hydrocarbons and benzenes), strong corrosion resistance and more than 6 years of service life. Can be effectively used for sewage containing special pollutants (such as phenol, poisonous and harmful metal ions, high acid, high alkali and the like).
In some embodiments, each aerobic tank adopts a jet aerator and micropore aeration combined mode to supply oxygen by water inflow aeration;
each jet aerator is provided with a corresponding jet water pump and is of an air supply type;
air for aerating each jet aerator and the corresponding micropore is provided by a blower.
The structure can optimize the flow state of the water body in the pool.
In some embodiments, the multiple anoxic tanks and the corresponding aerobic tanks are connected in series.
In certain embodiments, the membrane tanks are each provided with an ultrafiltration membrane bioreactor; the ultrafiltration membrane bioreactor is used for solid-liquid separation; and the kitchen wastewater treated in each membrane pool is discharged from one side of the membrane pool.
The membrane tank adopts a bioreactor to replace a traditional secondary sedimentation tank, the solid-liquid separation function is exerted, the solid-liquid separation capacity is good and stable, sludge is retained in the membrane tank, the sludge concentration in the membrane tank is improved, the sludge concentration can reach 8000-10000 mg/L, and the organic load is obviously improved.
In some embodiments, an automatic water-producing backwashing system and a dosing system are arranged in the membrane pool, and an ultraviolet sterilizer is arranged at a water outlet;
the sludge reflux amount in the membrane tank is 100 to 200 percent;
the membrane tank has the function of discharging residual sludge at regular time; the discharged sludge is subjected to sludge dewatering treatment;
the membrane pool is provided with a plurality of dosing systems;
the plurality of dosing systems comprise a PAC dosing system, an acid washing dosing system and an alkali washing dosing system;
the reagent of the acid-washing medicine-adding system is citric acid;
the agent of the alkali washing medicine adding system is the mixture of sodium hydroxide and sodium hypochlorite;
each medicine adding system is provided with a medicine dissolving box, a stirrer and a medicine adding pump.
Example 2
For example, a certain kitchen waste wastewater treatment station adopts the method for treatment, in particular to a three-stage anoxic-aerobic + membrane pool combined process.
The CODCr of inlet water is 8000-8000 mg/L, NH3-N is 1000-2000mg/L, TN is 1000-2500mg/L, the total hydraulic retention time is 110h, the CODCr of treated outlet water is less than 300mg/L, NH3-N is less than 10mg/L, TN is less than 30mg/L, the average removal rate of the CODCr is more than 90%, and the average removal rates of NH3-N and TN are more than 99%.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A high-efficiency denitrification treatment method for kitchen wastewater; the method comprises the following steps:
step 1, pretreating kitchen wastewater; the pretreatment uses a physical treatment method to remove grease and large suspended particles in the wastewater;
step 2, inputting the kitchen wastewater after pretreatment into a first-stage anoxic tank, mixing the kitchen wastewater with sludge refluxed from a membrane tank and mixed liquid refluxed from a first-stage aerobic tank, and providing nitrate nitrogen from a reflux system from the first-stage aerobic tank to the first-stage anoxic tank to perform denitrification reaction;
step 3, the kitchen wastewater subjected to nitration reaction in the first-stage anoxic tank enters the first-stage aerobic tank from the effluent of the first-stage anoxic tank, and most organic matters are removed through aeration to realize nitration reaction;
step 4, the kitchen wastewater aerated in the first-stage aerobic tank enters the next-stage anoxic tank from the effluent of the first-stage aerobic tank, and the denitrification reaction is continuously carried out on the residual nitrate nitrogen;
step 5, repeatedly executing the step 2 to the step 4, and enabling the kitchen wastewater to be processed by the multistage anoxic tank and the corresponding aerobic tank;
step 6, enabling the kitchen wastewater treated by the multistage anoxic tank and the corresponding aerobic tank to flow into a membrane tank, and further degrading residual organic matters;
the membrane tank is provided with a sludge reflux pump;
the sludge reflux pump is used for refluxing the sludge in the membrane tank to the first-stage anoxic tank;
the returned sludge and the pretreated kitchen wastewater are mixed and then enter the first-stage anoxic tank to dilute the ammonia nitrogen concentration in the first-stage anoxic tank; discharging the residual sludge into a sludge tank;
and 7, putting the kitchen wastewater treated by the membrane pool into a clean water pool.
2. The method for efficiently denitrifying kitchen wastewater according to claim 1, wherein each anoxic tank is hydraulically stirred by means of internal reflux jet.
3. The method for efficiently denitrifying kitchen wastewater according to claim 2, wherein an ejector is provided at the bottom of each anoxic tank;
the jet pump of each jet device is used for injecting the nitrified liquid at the tail end of the aerobic pool in the same stage into the jet device of the corresponding anoxic pool;
each anoxic pond realizes the complete mixing in the anoxic pond through the powerful hydraulic disturbance effect of the corresponding ejector;
each anoxic tank is provided with a fixed bed flat plate filler.
4. The method for highly efficient denitrification treatment of kitchen wastewater according to claim 3, wherein the reflux amount of each jet pump for injecting the nitrified liquid from the end of the aerobic tank of the same stage into the corresponding jet device of the anoxic tank is 100% to 300%.
5. The method for efficiently denitrifying kitchen wastewater according to claim 1, wherein each of said aerobic tanks is provided with a novel fixed ionic enzymatic suspended filler.
6. The method for high-efficiency denitrification treatment of kitchen wastewater according to claim 5, wherein microorganisms are immobilized on the surface of the filler film of each novel fixed ionic enzymatic suspended filler.
7. The method for efficiently denitrifying kitchen wastewater according to claim 4, wherein each aerobic tank is supplied with water, aerated and oxygen by adopting a jet aerator and a microporous aerator in a combined manner;
each jet aerator is provided with a corresponding jet water pump and is of an air supply type;
air for aerating each jet aerator and the corresponding micropore is provided by a blower.
8. The method for efficiently denitrifying kitchen wastewater according to claim 1, wherein the anoxic tanks and the corresponding aerobic tanks are connected in series.
9. The method for efficiently denitrifying kitchen wastewater according to claim 1, wherein the membrane tanks are all provided with ultrafiltration membrane bioreactors; the ultrafiltration membrane bioreactor is used for solid-liquid separation; and discharging the kitchen wastewater treated in each membrane pool from one side of the membrane pool.
10. The method for efficiently denitrifying kitchen wastewater according to claim 1, wherein an automatic water-producing backwashing system and a dosing system are provided in the membrane tank, and an ultraviolet sterilizer is provided at a water outlet;
the sludge reflux amount in the membrane tank is 100 to 200 percent;
the membrane tank is provided with a function of discharging the residual sludge at regular time; performing sludge dewatering treatment on the discharged sludge;
the membrane tank is provided with a plurality of dosing systems;
the plurality of drug adding systems comprise a PAC drug adding system, an acid washing drug adding system and an alkali washing drug adding system;
the reagent of the acid-washing medicine-adding system is citric acid;
the reagent of the alkali washing medicine adding system is the mixture of sodium hydroxide and sodium hypochlorite;
each medicine adding system is provided with a medicine dissolving box, a stirrer and a medicine adding pump.
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