CN107840550B - Method for treating garbage leachate - Google Patents
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- 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
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- Environmental & Geological Engineering (AREA)
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- Water Treatment By Electricity Or Magnetism (AREA)
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Abstract
The invention provides a method for treating garbage leachate, which comprises the following steps: the landfill leachate to be treated enters a microbial electrolysis cell reactor to carry out microbial electrochemical reaction; the effluent after the microbial electrochemical reaction enters an anoxic denitrification reactor to carry out anoxic denitrification reaction; the effluent after the anoxic denitrification reaction enters a short-cut nitrification reactor for short-cut nitrification reaction; the effluent after the short-cut nitration enters an anaerobic ammonia oxidation reactor to carry out anaerobic ammonia oxidation reaction; the garbage leachate is directly discharged after the reaction treatment in sequence through the steps. The method for treating the garbage leachate can efficiently remove organic pollutants in the garbage leachate and efficiently denitrify, so that the treated garbage leachate can stably reach the standard. In addition, the technology of the invention can be used for treating the garbage leachate, and can also save the operation energy consumption and the later sludge treatment cost.
Description
Technical Field
The invention relates to a method for treating garbage leachate, which is suitable for garbage leachate treatment and belongs to the field of high-concentration wastewater treatment.
Background
In recent years, the annual domestic waste production in cities has increased dramatically at a rate of 8% to 10%. The traditional household garbage disposal methods mainly comprise two ways, namely garbage landfill or incineration power generation. Large quantities of landfill leachate are produced by landfill or fermentation before incineration. The household garbage has complex components and large fluctuation of water content, and simultaneously, environmental conditions (fermentation temperature, fermentation time, air humidity, rainfall, regional conditions and the like) in the garbage fermentation process have uncertainty, so the garbage incineration leachate has complex components, contains various organic pollutants, has large variation range and can influence the garbage incineration leachate in different seasons. Generally speaking, the landfill leachate has the characteristics of high Chemical Oxygen Demand (COD), high ammonia nitrogen, high salinity, unbalanced nutrition and the like, and belongs to high-concentration wastewater which is difficult to treat.
At present, the treatment process of the waste leachate generally adopts physicochemical and biochemical combined processes of pretreatment, anaerobic digestion, aerobic treatment, advanced treatment and the like. Although these combined processes achieve good processing results, there are still some leaves to be improved: for example, the removal rate of refractory organic matters in the anaerobic stage is low, and the denitrification effect is influenced by the subsequent process; in the anoxic denitrification stage, an additional carbon source is required to ensure that nitrate nitrogen is effectively removed; the aerobic denitrification process needs a large amount of aeration, and has high energy consumption and the like;
therefore, the method has important significance in improving the process treatment effect and reducing the process operation energy consumption. The Microbial Electrolysis Cell (MEC) technology is a new technology which is rapidly developed in recent years and combines sewage treatment and energy generation, and takes microbes as a reaction main body, applies current between a cathode and an anode, metabolizes organic matters in sewage to generate hydrogen or methane through a Microbial membrane formed by anaerobic electrogenic microbes on the anode, and obtains different forms of energy while performing biological treatment on the sewage. The technology can strengthen the degradation effect of the anaerobic reactor on organic pollutants in the garbage incineration leachate, and particularly can strengthen the removal effect of refractory organic matters in the leachate.
The short-cut nitrification-anaerobic ammonia oxidation process (Sharon-Anamox) is a high-efficiency denitrification process suitable for high-ammonia nitrogen low-carbon wastewater, and comprises two biological processes, firstly, about 50% of ammonia nitrogen in the wastewater is oxidized into nitrite nitrogen in an aerobic short-cut nitrification reactor, then, anaerobic ammonia oxidizing bacteria react to generate nitrogen by taking the nitrite nitrogen as an electron acceptor and taking the ammonia nitrogen as a direct electron donor under anaerobic conditions, and the purpose of completely autotrophic denitrification of the ammonia nitrogen in the wastewater is achieved. As can be seen, the Sharon-Anamox process can achieve the purpose of denitrification without additional carbon source, and has high total nitrogen removal rate and low oxygen consumption. However, the process cannot remove organic matters, and the organic matters have certain influence on the nitrification process and the anaerobic ammonia oxidation process. In addition, the research and application of the anaerobic ammonia oxidation technology at present mainly focuses on the treatment of high-temperature high-ammonia nitrogen wastewater, and a device and a process for synchronously denitrifying municipal sewage and removing organic pollutants based on the anaerobic ammonia oxidation technology are rarely reported.
Therefore, a new landfill leachate treatment process needs to be provided, which can achieve the purposes of efficiently removing organic pollutants and efficiently denitrifying, and can save the operation energy consumption and the treatment cost of the sludge at the later stage.
Disclosure of Invention
The invention aims to provide a waste leachate treatment process aiming at the complex characteristics of waste leachate and the defects of the prior art, which can save cost, increase productivity and reduce energy consumption while achieving the purposes of efficiently removing organic pollutants and efficiently denitrifying. The process provided by the invention can realize the removal rate of COD (chemical oxygen demand) of the waste leachate to be more than 95%, the removal rate of ammonia nitrogen to be 100% and the removal rate of total nitrogen to be more than 90%.
The invention aims to solve the problems by the following technical scheme:
a method for treating landfill leachate, comprising the following steps:
s1: the landfill leachate to be treated enters a microbial electrolysis cell reactor to carry out microbial electrochemical reaction;
s2: the effluent after the microbial electrochemical reaction enters an anoxic denitrification reactor to carry out anoxic denitrification reaction;
s3: the effluent after the anoxic denitrification reaction enters a short-cut nitrification reactor for short-cut nitrification reaction;
s4: the effluent after the short-cut nitration enters an anaerobic ammonia oxidation reactor to carry out anaerobic ammonia oxidation reaction;
s5: the garbage leachate is directly discharged after the reaction treatment in sequence through the steps.
And further, one part of the effluent after the anoxic denitrification reaction enters the short-cut nitrification reactor, and the other part of the effluent enters the anaerobic ammonia oxidation reactor, and the effluent entering the anaerobic ammonia oxidation reactor after the short-cut nitrification reaction are subjected to anaerobic ammonia oxidation reaction together.
Furthermore, the effluent after the short-cut nitrification reaction enters an intermediate water tank, one part of the effluent after the anoxic denitrification reaction directly enters the short-cut nitrification reactor, and the other part of the effluent enters the intermediate water tank; and uniformly mixing the effluent after the short-cut nitrification reaction and the effluent after the anoxic denitrification reaction in an intermediate water tank, and then entering an anaerobic ammonia oxidation reactor for anaerobic ammonia oxidation reaction.
And further, controlling 60-80% of the water yield of the anoxic denitrification reactor to enter the short-range nitrification reactor, and controlling the rest 20-40% to enter the intermediate water tank.
Furthermore, the effluent water after the microbial electrochemical reaction at least removes 80 percent of COD.
Further, the garbage leachate after the anaerobic ammonia oxidation reaction treatment flows back to the anoxic denitrification reactor for continuous treatment.
Furthermore, the effluent after the microbial electrochemical reaction can firstly enter an intermediate water tank and then enter an anoxic denitrification reactor for reaction.
Furthermore, the effluent entering the short-cut nitrification reactor after the anoxic denitrification reaction can enter the intermediate water tank and then enter the short-cut nitrification reactor for reaction.
And further, one part of the effluent after the microbial electrochemical reaction enters an anoxic denitrification reactor for reaction, and the other part of the effluent flows back to the microbial electrolytic cell for continuous treatment.
Further, the garbage leachate is pretreated and then enters a reactor of a microbial electrolysis cell for reaction.
Further, the effluent flow and the effluent quality of the effluent after the microbial electrochemical reaction, the anoxic denitrification reaction, the partial nitrification reaction or the anaerobic ammoxidation reaction are controlled.
The garbage leachate treatment device provided by the invention has the working principle that:
in the anaerobic stage, the microbial electrolytic cell reactor improves the microbial community structure in the reactor by enriching the microbes such as bacteria and archaea which can participate in the inter-species electron transfer, and promotes the bioelectrochemical reaction in the anaerobic nitration process by improving the inter-species electron transfer rate, so that the garbage is percolatedThe liquid is subjected to microbial electrochemical reaction in a microbial electrolytic cell reactor to remove organic pollutants strongly, so that the removal rate of COD is improved; in the anoxic and aerobic stage, after the water is discharged from the microbial electrolysis tank reactor, the water enters an anoxic denitrification reactor to further remove organic pollutants and nitrate nitrogen. The partial nitrification and anaerobic ammonia oxidation reactor continues to remove nitrogen on the basis of the anoxic denitrification reactor, and the nitrite nitrogen and the ammonia nitrogen are simultaneously converted into N under the action of anaerobic ammonia oxidizing bacteria under the anaerobic condition by taking the nitrite nitrogen as an electron acceptor and taking the ammonia nitrogen as an electron donor2. Compared with the traditional denitrification process, the process saves about 50 percent of aeration amount, thereby reducing energy consumption and needing no additional carbon source. In addition, the proportion of nitrate nitrogen in the effluent of the anaerobic ammonia oxidation reactor is low, and the content of the nitrate nitrogen in the anoxic denitrification stage can be effectively reduced during reflux, so that the demand of anoxic denitrification on a carbon source is reduced.
According to the principle, the invention has the beneficial effects that:
removing organic pollutants efficiently: the microbial electrolytic cell reactor can realize the high-efficiency treatment of the organic pollutants in the waste leachate by improving the microbial community structure and strengthening the microbial electrochemical reaction;
increase productivity, reduce energy consumption: the microbial electrolytic cell reactor can promote the methane production process, and improve the methane yield and the methane yield; anaerobic ammonia oxidation and short-cut nitrification do not need an additional carbon source, and energy consumption caused by aeration is reduced; the proportion of nitrate nitrogen in the effluent of the anaerobic ammonia oxidation reactor is low, and the content of the nitrate nitrogen in the anoxic denitrification stage can be effectively reduced, so that the demand of anoxic denitrification on a carbon source is reduced.
The cost is reduced: the ammonia nitrogen load born by the shortcut nitrification and the anaerobic ammonia oxidation is higher, the process scale can be reduced, and the capital construction cost is reduced; the sludge in the nitrosation and anaerobic ammoxidation reactors grows slowly, and the amount of the residual sludge is small, so that the later-stage sludge treatment cost is reduced.
Drawings
Fig. 1 is a schematic view of a waste leachate treatment plant according to one embodiment of the present invention;
FIG. 2 is a graph comparing the removal of COD by the apparatus of FIG. 1 and a control reactor.
Wherein the reference numerals are as follows:
1: a microbial electrolysis cell reactor;
1 a: a water inlet end of the microbial electrolysis cell reactor;
1 b: the water outlet end of the microbial electrolysis cell reactor;
2: an anoxic denitrification reactor;
2 a: the water inlet end of the anoxic denitrification reactor;
2 b: the water outlet end of the anoxic denitrification reactor;
2 c: the water outlet end of the anoxic denitrification reactor;
3: a short-cut nitrification reactor;
3 a: the water inlet end of the short-cut nitrification reactor;
3 b: the water outlet end of the short-cut nitrification reactor;
4: an anammox reactor;
4 a: the water inlet end of the anaerobic ammonia oxidation reactor;
4 b: the water outlet end of the anaerobic ammonia oxidation reactor;
4 c: the water outlet end of the anaerobic ammonia oxidation reactor;
5: an intermediate water tank;
6. 7: a return pipe;
Detailed Description
The garbage incineration leachate used in the embodiment of the application is from a certain garbage incineration power plant in Beijing, and the water quality index is as follows: 40240 and 80480mg/L, BOD5：22870–50350mg/L，NH4 +-N：1042–1395mg/L，TN：1330–2179mg/L，SS：8000–10000mg/L。
The Chemical Oxygen Demand (COD) is a comprehensive index of the relative content of organic substances, and the larger the numerical value is, the more serious the pollution condition of the water body is; the Biochemical Oxygen Demand (BOD)5) Generally means five daysBiochemical oxygen demand is an important indicator of the degree of contamination of water by organic matter indirectly by the amount of dissolved oxygen consumed by microbial metabolism. The ammonia Nitrogen (NH)4 +-N) means ionic ammonia (NH 4) in aqueous solution+) Nitrogen is present in the form. Ammonia nitrogen is a nutrient in water, can cause water eutrophication, is a main oxygen-consuming pollutant in the water and is toxic to fishes and some aquatic organisms; the Total Nitrogen (TN) refers to the total amount of various forms of inorganic and organic nitrogen in water, including NO3-、NO2-And NH4+Inorganic nitrogen and organic nitrogen such as protein, amino acid and organic amine are often used to indicate the degree of contamination of water by nutrients, calculated as milligrams of nitrogen per liter of water. The suspended matter (SS) refers to solid matter suspended in water, including inorganic matter, organic matter, silt, clay, microorganism, etc., which are insoluble in water.
The invention is further illustrated by the following specific examples.
As shown in fig. 1, the device for treating landfill leachate of the present invention is formed by connecting a microbial electrolysis cell reactor 1, an anoxic denitrification reactor 2, a shortcut nitrification reactor 3 and an anaerobic ammonia oxidation reactor 4 in series through pipelines:
the microbial electrolysis tank reactor 1 is provided with a garbage leachate water inlet end 1a and a garbage leachate water outlet end 1b, and the water outlet end 1b of the microbial electrolysis tank reactor 1 is connected with a water inlet end 2a of the anoxic denitrification reactor 2; the water outlet end 2b of the anoxic denitrification reactor 2 is connected with the water inlet end 3a of the short-cut nitrification reactor 3; the water outlet end 3b of the shortcut nitrification reactor 3 is connected with the water inlet end 4a of the anaerobic ammonia oxidation reactor 4, and the anaerobic ammonia oxidation reactor 4 is also provided with a water outlet end 4 b. The anoxic denitrification reactor 2 is provided with a water outlet end 2c, and the water outlet end 2c is connected with a water inlet end 4a of the anaerobic ammonia oxidation reactor 4. The device can also be provided with an intermediate water tank 5, one end of which is respectively connected with the water outlet end 2c of the anoxic denitrification reactor 2 and the water outlet end 3b of the short-cut nitrification reactor 3, and the other end of which is connected with the water inlet end 4a of the anaerobic ammonia oxidation reactor 4. The anaerobic ammonia oxidation reactor 4 is provided with a water outlet end 4c and a return pipe 6, one end of the return pipe 6 is connected with the water outlet end 4c, and the other end is connected with the water inlet end 2a of the anoxic denitrification reactor 2. An intermediate water tank is arranged between the water outlet end 1b and the water inlet end 2a or between the water outlet end 2b and the water inlet end 3 a. A return pipe 7 is arranged at the water outlet end 1b of the microbial electrolysis cell reactor 1, one end of the return pipe 7 is connected with the water outlet end 1b, and the other end is connected with the water inlet end 1a of the microbial electrolysis cell reactor 1. The water inlet end 1a of the microbial electrolysis cell reactor 1 can be also provided with a water inlet pump. One or more of the water inlet end 2a, the water outlet end 2b, the water outlet end 2c, the water outlet end 3b, the water outlet end 4b and the water outlet end 4c can be provided with a water valve and a flowmeter.
The specific operation is as follows:
the inlet water of the microbial electrolysis cell reactor can be provided with or without a pre-pretreatment process according to actual conditions. The pretreatment process generally comprises temperature regulation, water quality and quantity regulation, pre-aeration, removal of large-particle pollutants (including grease substances) suspended in wastewater and the like, and the related equipment mainly comprises a grating machine, an oil and slag scraping machine, a regulating tank, a grit chamber, a primary settling tank and the like. When the landfill leachate needs to be pretreated, a water inlet pump can be arranged at the water inlet end 1a of the microbial electrolysis cell reactor 1, and the pretreated stock solution is stored in a pretreatment water tank and enters the microbial electrolysis cell reactor 1 through the water inlet pump arranged at the water inlet end 1 a. The garbage leachate enters water from the water inlet end 1a of the microbial electrolysis cell reactor 1 and then exits water through the water outlet end 1 b.
The landfill leachate stoste is treated with organic pollutants in a microbial electrolytic cell reactor 1: setting the hydraulic retention time of the microbial electrolysis cell reactor 1 to be 3 d-7 d, the operating temperature to be 30-37 ℃, and providing a potential of 0.5-0.9V by a direct current constant voltage power supply. The method for increasing the COD concentration of the influent water of the leachate in a gradient manner is adopted to increase the operation load of the microbial electrolysis cell reactor 1 to 25-30 kg of COD/(m)3D) still operating normally under the processing load above.
When more than 80% of COD is removed from the liquid passing through the microbial electrolysis cell reactor 1, the treated liquid is discharged from the water outlet end 1b and enters the anoxic denitrification reactor 2 through the water inlet end 2 a. The water inlet end 2a can be provided with a valve and a flowmeter, according to the actual requirement, the water inlet of the anoxic denitrification reactor 2 is controlled by the valve and the flowmeter, all or part of the water enters the anoxic denitrification reactor 2, and the rest part of the water flows back to the water inlet end 1a of the microbial electrolysis cell reactor 1 through a return pipe 7 arranged at the water outlet end 1 b.
In the anoxic denitrification stage, the hydraulic retention time of the anoxic denitrification reactor 2 is set to be 3 d-7 d, the reaction temperature is 25-30 ℃, and the dissolved oxygen is 0.2-0.5 mg/L. At this stage, the denitrifying bacteria, under anoxic conditions, further remove organic contaminants and reduce nitrate nitrogen. The anoxic denitrification reactor 2 is respectively provided with a water outlet end 2b and a water outlet end 2c, the water outlet end 2b is connected with the water inlet end 3a of the shortcut nitrification reactor 3, and the water outlet end 2c is connected with the water inlet end 4a of the anaerobic ammonia oxidation reactor 4. An intermediate water tank 5 can be arranged in the device, one end of the intermediate water tank 5 is respectively connected with the water outlet end 2c and the water outlet end 3b, and the other end is connected with the water inlet end 4 a. Part of the effluent of the anoxic denitrification reactor 2 can enter the intermediate water tank 5 and uniformly mix with the effluent of the short-cut nitrification reactor 3, and then the mixture enters the anaerobic ammonia oxidation reactor 4. And valves and flow meters can be respectively arranged at the water outlet ends 2b and 2c of the anoxic denitrification reactor 2, 60-80% of the water outlet amount of the anoxic denitrification reactor 2 is controlled to enter the short-distance nitrification reactor 3, and the rest 20-40% enters the intermediate water tank 5.
In the short-cut nitrification stage, the hydraulic retention time of the short-cut nitrification reactor 3 is set to be 1 d-3 d, the reaction temperature is 22-27 ℃, and the dissolved oxygen is 0.5-3.0 mg/L. About 50% of ammonia nitrogen in the wastewater is oxidized into nitrite nitrogen in an aerobic shortcut nitrification reactor, and then the effluent (including generated nitrite nitrogen and unreacted ammonia nitrogen, the proportion of which is about 1:1) of the shortcut nitrification reactor 3 enters an intermediate water tank 5 through an effluent end 3b or directly enters an anaerobic ammonia oxidation reactor 4 through an influent end 4 a.
In the anaerobic ammonia oxidation stage, the hydraulic retention time of the anaerobic ammonia oxidation reactor 4 is 2 d-7 d, and the reaction temperature is 32-37 ℃. Under the anaerobic condition, the anaerobic ammonia oxidizing bacteria react with nitrite nitrogen as an electron acceptor and ammonia nitrogen as a direct electron donor to generate nitrogen, so that the ammonia nitrogen in the wastewater is subjected to autotrophic nitrogen removal in the whole course. The anaerobic ammonia oxidation reactor 4 is respectively provided with a water outlet end 4b, a water outlet end 4c and a return pipe 7 connected with the water outlet end 4c, 70-85% of anaerobic ammonia oxidation effluent can be controlled to flow back to the water inlet end 2a of the anoxic denitrification reactor 2 through the return pipe 7 by valves and flow meters arranged at the water outlet end 4b and the water outlet end 4c, and the rest part is discharged as effluent through the water outlet end 4 b.
As shown in FIG. 2, by using Upflow Anaerobic Sludge Blanket (UASB) (purchased from Beijing Ying and Rui environmental protection engineering Co., Ltd.) as a control reactor and comparing the COD removal effect and the biogas yield of the device and the control reactor, the results show that the device has better effect on sewage treatment, and after stable operation (about 1-2 weeks), the COD removal rate is more than 95%, the ammonia nitrogen removal rate is 100%, and the total nitrogen removal rate is more than 90%. The biogas yield is also greater than that of the control reactor.
The microbial electrolytic cell reactor is an anaerobic reaction generator which promotes anaerobic reaction through bioelectrochemical reaction and recovers energy substances and valuable products in the forms of hydrogen, methane, ethanol, hydrogen peroxide and the like. In the above embodiment, the electrodes made of different materials are added to the microbial electrolytic cell reactor, so that under the action of an external potential, on one hand, the hydrogen production rate is increased, hydrogen can be used as an electron donor of methanogens, and on the other hand, fermentation type bacteria and methanogens are enriched in the system, so that the generation of methane is promoted.
In the above embodiment, the "anammox reactor" is generally of a tank type and a tank body structure, the volume can be calculated by ammonia nitrogen removal, and the function is to convert nitrite nitrogen into nitrogen under anaerobic conditions, so as to remove the total nitrogen in the final leachate. The anoxic denitrification reactor and the short-cut nitrification reactor are designed according to the same basis as the nitrification denitrification reactor in the prior art, and have the differences that the retention time is shortened and the tank volume is reduced. After the stable operation in the practical engineering, the dissolved oxygen is controlled to be between 1 and 2 mg/l.
The sewage discharge standard referred by the invention is 'sewage discharge to town sewer water quality standard' (GB/T31962-2015) implemented in 2016, 8, 1, and the reuse standard has different requirements according to different reuse positions, such as: water is supplemented in an open type circulating cooling water system in GB/T19923-2005. In addition, the standard of sewage discharge varies depending on the region. The device of the invention can be modified and adapted on the basis of the above-described embodiments according to different emission standards.
The above embodiment shows the main treatment unit and the design principle of the sewage treatment method of the present invention, but the arrangement of the water inlet and outlet manner, the backflow arrangement, the valve and the flowmeter, etc. is not limited to the above explanation; the pre-pretreatment process and the subsequent advanced treatment process can be set or not set according to the actual situation of the main method for treating the waste leachate. In addition, the method is suitable for but not limited to the treatment of the garbage leachate, and can also be used for the treatment of high-concentration organic wastewater.
The present invention is not limited to the above embodiments, which do not limit the scope of the present invention in any way. Certain changes and modifications within the scope of the claims, which may be made by one skilled in the art, are also considered to be within the scope of the invention.
Claims (6)
1. A method for treating waste leachate, which is characterized by comprising the following steps:
s1: the landfill leachate to be treated enters a microbial electrolysis cell reactor to carry out microbial electrochemical reaction;
s2: the effluent after the microbial electrochemical reaction enters an anoxic denitrification reactor to carry out anoxic denitrification reaction;
s3: one part of the effluent after the anoxic denitrification reaction directly enters a short-cut nitrification reactor for short-cut nitrification reaction, and the other part of the effluent enters an intermediate water tank 1;
s4: the effluent after the short-cut nitrification reaction enters the intermediate water tank 1, and the effluent after the short-cut nitrification reaction and the effluent after the anoxic denitrification reaction are uniformly mixed in the intermediate water tank 1 and then enter an anaerobic ammonia oxidation reactor for anaerobic ammonia oxidation reaction;
s5: one part of the landfill leachate treated by the anaerobic ammonia oxidation reaction flows back to the anoxic denitrification reactor for continuous treatment, and the other part is directly discharged;
the microbial electrolytic cell reactor is an anaerobic reaction generator containing methanogen and anaerobic fermentation hydrogen-producing bacteria, so that an external carbon source is not required in the processes of the anoxic denitrification reaction, the short-range nitrification reaction and the anaerobic ammonia oxidation reaction, and at least 80% of COD (chemical oxygen demand) of effluent after the electrochemical reaction of the microbes is removed.
2. The treatment method according to claim 1, wherein 60-80% of the water yield of the anoxic denitrification reactor is controlled to enter the short-cut nitrification reactor, and the remaining 20-40% enters the intermediate water tank 1.
3. The treatment method as claimed in claim 1, wherein the effluent after the microbial electrochemical reaction enters the intermediate water tank 2 and then enters the anoxic denitrification reactor for reaction.
4. The treatment method as claimed in claim 1, wherein the effluent entering the short-cut nitrification reactor after the anoxic denitrification reaction firstly enters the intermediate water tank 3 and then enters the short-cut nitrification reactor for reaction.
5. The treatment method as claimed in claim 1, wherein a part of the effluent after the microbial electrochemical reaction enters an anoxic denitrification reactor for reaction, and the other part of the effluent flows back to the microbial electrolytic cell for continuous treatment.
6. The treatment method according to claim 1, wherein the effluent flow rate and the effluent quality of the effluent after the microbial electrochemical reaction, after the anoxic denitrification reaction, after the partial nitrification reaction or after the anaerobic ammoxidation reaction are controlled.
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| CN111777292A (en) * | 2019-12-30 | 2020-10-16 | 重庆大学 | A kind of low carbon nitrogen ratio food waste fermentation wastewater AOA biofilm treatment system and method |
| CN112250162B (en) * | 2020-10-09 | 2022-11-18 | 哈尔滨工业大学 | Low-C/N sewage deep denitrification device and denitrification method by coupling microbial electrolytic cell with BAF-MBfR |
| CN114230100A (en) * | 2021-12-20 | 2022-03-25 | 湖南军信环保股份有限公司 | Treatment method of aged leachate |
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