CN107840444B - Treatment device for garbage leachate - Google Patents
Treatment device for garbage leachate Download PDFInfo
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Classifications
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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
- C02F3/30—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
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- 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
- C02F2209/02—Temperature
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- 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]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C02F2209/22—O2
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- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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Abstract
The invention provides a garbage leachate treatment device, which is formed by sequentially connecting four treatment units of a microbial electrolytic cell reactor, an anoxic denitrification reactor, a shortcut nitrification reactor and an anaerobic ammoxidation reactor in series through pipes: the microbial electrolytic cell reactor is provided with a garbage leachate water inlet end and a garbage leachate water outlet end, and the water outlet end of the microbial electrolytic cell reactor is connected with the anaerobic denitrification reactor water inlet end; the water outlet end of the anoxic denitrification reactor is connected with the water inlet end of the shortcut nitrification reactor; the water outlet end of the short-cut nitrification reactor is connected with the water inlet end of the anaerobic ammonia oxidation reactor, and the water outlet end of the anaerobic ammonia oxidation reactor is connected with an outer discharge port or a lower treatment unit. The treatment device can efficiently remove the organic pollutants of the garbage leachate and efficiently denitrify, so that the treated garbage leachate can stably reach the standard. In addition, the device can save the operation energy consumption and the treatment cost of the later sludge in the process of treating the garbage leachate.
Description
Technical Field
The invention relates to a treatment device for landfill leachate, which is suitable for treatment of landfill leachate and belongs to the field of high-concentration wastewater treatment.
Background
In recent years, the annual household garbage yield of cities is rapidly increased by 8% -10%. The traditional household garbage treatment approaches mainly comprise two types, namely garbage landfill or incineration power generation. Fermentation prior to landfill or incineration produces large amounts of landfill leachate. Because the household garbage components are complex, the fluctuation of the water content is large, and meanwhile, the environmental conditions (fermentation temperature, fermentation time, air humidity, precipitation, regional conditions and the like) in the garbage fermentation process have uncertainty, so that the leachate components of the garbage incineration power plant are complex, the variety of organic pollutants is large, the variation range is large, in addition, factors such as rainfall, garbage pit temperature, garbage stacking time and the like also influence the components of the leachate, and the complexity of short-term fluctuation and long-term variation of the COD concentration of the leachate exists. In general, the garbage leachate has the characteristics of high Chemical Oxygen Demand (COD), high ammonia nitrogen, high salinity, unbalanced nutrition and the like, and belongs to the difficult-to-treat high-concentration wastewater.
At present, the treatment process of the garbage leachate generally adopts physicochemical and biochemical combination processes such as pretreatment, anaerobic digestion, aerobic treatment, advanced treatment and the like. Although these combined processes achieve good treatment results, there are still some areas to be improved: for example, the removal rate of refractory organic matters in the anaerobic stage is low, and the denitrification effect is affected by entering the subsequent process; in the anoxic denitrification stage, an additional carbon source is needed to ensure that nitrate nitrogen is effectively removed; the aerobic denitrification process needs a large amount of aeration, has higher energy consumption and the like;
Therefore, the method has important significance in improving the treatment effect of the process and reducing the energy consumption of the process operation. The microbial electrolysis cell technology (Microbial Electrolysis Cell, MEC) is a new technology which has been rapidly developed in recent years and which combines sewage treatment and energy generation, and utilizes microorganisms as a reaction main body, applies current between a cathode and an anode, and metabolizes organic matters in sewage through a layer of microbial film formed by anaerobic electrogenesis microorganisms on the anode to generate hydrogen or methane, so that different forms of energy can be obtained while the sewage is biologically treated. The technology can strengthen the degradation effect of the anaerobic reactor on organic pollutants in the waste incineration leachate, and particularly can strengthen the removal effect of refractory organic matters in the leachate.
A 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, wherein about 50% of ammonia nitrogen in the wastewater is oxidized into nitrous acid nitrogen in an aerobic short-cut nitrification reactor, and then an anaerobic ammonia oxidation bacterium reacts with nitrous acid nitrogen serving as an electron acceptor and ammonia nitrogen serving as a direct electron donor under an anaerobic condition to generate nitrogen, so that the whole-course autotrophic denitrification of the ammonia nitrogen in the wastewater is achieved. Therefore, the Sharon-Anamox process can achieve the aim of denitrification without adding any 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 are mainly concentrated in the treatment of high-temperature high-ammonia nitrogen wastewater, and the device and the technology for synchronously denitrifying and removing organic pollutants from urban sewage based on the anaerobic ammonia oxidation technology are rarely reported.
Therefore, there is a need to propose a new garbage leachate treatment device, which can achieve efficient removal of organic pollutants and efficient denitrification, and simultaneously can save operation energy consumption and treatment cost of post-sludge.
Disclosure of Invention
The invention aims at solving the complex characteristics of the landfill leachate and the defects of the prior art, and provides a treatment device for the landfill leachate, which can save cost, increase productivity and reduce energy consumption while achieving the purposes of efficiently removing organic pollutants and efficiently denitrifying. The device provided by the invention can realize that the COD removal rate of the landfill leachate is more than 95%, the ammonia nitrogen removal rate is 100%, and the total nitrogen removal rate is more than 90%.
The invention aims at solving the problems through the following technical scheme: a garbage leachate treatment device is formed by sequentially connecting four treatment units of a microbial electrolytic cell reactor 1, an anoxic denitrification reactor 2, a shortcut nitrification reactor 3 and an anaerobic ammoxidation reactor 4 in series through pipes:
The microbial electrolytic cell 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 electrolytic cell reactor 1 is connected with the 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 short-cut 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 4b.
Further, 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 ammoxidation reactor 4.
Further, an intermediate water tank 5 is further provided, one end of the intermediate water tank 5 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 is connected with the water inlet end 4a of the anaerobic ammoxidation reactor 4.
Further, 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.
Further, an intermediate water tank is provided 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.
Further, a return pipe 7 is arranged at the water outlet end 1b of the microbial electrolytic 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 electrolytic cell reactor 1.
Further, the water inlet end 1a of the microbial electrolytic cell reactor 1 is connected with a pretreatment water tank.
Further, a water inlet pump is arranged at the water inlet end 1a of the microbial electrolytic cell reactor 1.
Further, 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 are provided with water valves and flow meters.
The invention provides a garbage leachate treatment device, which has the following working principle:
In the anaerobic stage, the microbial electrolytic cell reactor improves the microbial community structure in the reactor by enriching microorganisms such as bacteria and archaea capable of participating in inter-species electron transfer, and promotes the bioelectrochemical reaction of the anaerobic nitration process by improving the inter-species electron transfer rate, so that the garbage leachate is subjected to the bioelectrochemical reaction in the microbial electrolytic cell reactor to effectively remove organic pollutants, and the COD removal rate is improved; in the anoxic and aerobic stage, after the water is discharged from the microbial electrolytic cell reactor, the water enters the anoxic denitrification reactor to further remove organic pollutants and nitrate nitrogen. The short-cut nitrification and anaerobic ammonia oxidation reactor continuously removes nitrogen on the basis of the anoxic denitrification reactor, and nitrogen nitrite is taken as an electron acceptor and ammonia nitrogen is taken as an electron donor under the anaerobic condition by the action of anaerobic ammonia oxidation bacteria, so that the nitrogen nitrite and the ammonia nitrogen are simultaneously converted into N 2. Compared with the traditional denitrification process, the process saves about 50% of aeration, thereby reducing energy consumption and eliminating the need of adding additional carbon source. In addition, the proportion of nitrate nitrogen in the effluent of the anaerobic ammonia oxidation reactor is low, and the nitrate nitrogen content in the anoxic denitrification stage can be effectively reduced during reflux, so that the demand of anoxic denitrification for carbon sources is reduced.
The principle can show that the invention has the following beneficial effects:
and organic pollutants are removed efficiently: the microbial electrolytic cell reactor can realize the efficient treatment of the organic pollutants of the garbage leachate by improving the microbial community structure and strengthening the microbial electrochemical reaction;
increase productivity and reduce energy consumption: the microbial electrolytic cell reactor can promote the methanogenesis process and improve the methane yield and methane yield; anaerobic ammoxidation and shortcut nitrification do not need additional carbon source, and simultaneously energy consumption caused by aeration is reduced; the proportion of nitrate nitrogen in the effluent of the anaerobic ammoxidation reactor is low, so that the nitrate nitrogen content in the anoxic denitrification stage can be effectively reduced, and the demand of anoxic denitrification for carbon sources is reduced.
The cost is reduced: the short-cut nitrification and anaerobic ammonia oxidation bear higher ammonia nitrogen load, so that the process scale can be reduced, and the capital cost can be reduced; the sludge in the nitrosation and anaerobic ammoxidation reactor grows slowly, and the residual sludge is small, so that the post-sludge treatment cost is reduced.
Drawings
FIG. 1 is a schematic view of a garbage leachate treatment apparatus according to an embodiment of the present invention;
FIG. 2 is a graph comparing the removal of COD by the apparatus of FIG. 1 with a control reactor.
Wherein reference numerals are as follows:
1: a microbial cell reactor;
1a: a water inlet end of the microbial electrolytic cell reactor;
1b: the water outlet end of the microbial electrolytic cell reactor;
2: an anoxic denitrification reactor;
2a: the water inlet end of the anoxic denitrification reactor;
2b: the water outlet end of the anoxic denitrification reactor;
2c: the water outlet end of the anoxic denitrification reactor;
3: a short-cut nitration reactor;
3a: the water inlet end of the short-cut nitrification reactor;
3b: the water outlet end of the short-cut nitrification reactor;
4: an anaerobic ammoxidation reactor;
4a: the water inlet end of the anaerobic ammonia oxidation reactor;
4b: the water outlet end of the anaerobic ammoxidation reactor;
4c: the water outlet end of the anaerobic ammoxidation reactor;
5: an intermediate water tank;
6. 7: a return pipe;
Detailed Description
The waste incineration leachate used in the specific embodiment of the application is from a waste incineration power plant in Beijing city, and the water quality index is as follows COD：40240–80480mg/L,BOD5：22870–50350mg/L,NH4 +-N：1042–1395mg/L,TN：1330–2179mg/L,SS：8000–10000mg/L.
The Chemical Oxygen Demand (COD) is the amount of the reducing substances to be oxidized in the water sample measured by a chemical method, reflects the pollution degree of the reducing substances in the water, can be used as 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 refers to five-day biochemical oxygen demand, and is an important index for indirectly representing the pollution degree of the water body by organic matters by using the dissolved oxygen amount consumed by the metabolism of microorganisms. The ammonia nitrogen (NH 4 + -N) refers to nitrogen in the form of ionic ammonia (NH 4 +) in an aqueous solution. Ammonia nitrogen is a nutrient in a water body, can cause water eutrophication, is a main oxygen consumption pollutant in the water body, and is toxic to fish and certain aquatic organisms; the Total Nitrogen (TN) refers to the total amount of inorganic and organic nitrogen in water in various forms, including inorganic nitrogen such as NO 3-、NO2- and NH4 +, organic nitrogen such as protein, amino acid and organic amine, and is often used for indicating the pollution degree of the water body by nutrient substances in terms of milligrams of nitrogen per liter of water. The Suspended Solids (SS) are solid materials suspended in water, and include inorganic materials, organic materials, muddy sand, clay, microorganisms, etc., which are insoluble in water.
The invention is further illustrated by the following specific examples.
As shown in figure 1, the garbage leachate treatment device is formed by sequentially connecting a microbial electrolytic 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 electrolytic cell 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 electrolytic cell reactor 1 is connected with the 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 short-cut 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 4b. 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 ammoxidation 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 ammoxidation 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 electrolytic 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 electrolytic cell reactor 1. A water inlet pump can be arranged at the water inlet end 1a of the microbial electrolytic cell reactor 1. 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 further provided with a water valve and a flowmeter.
The specific operation is as follows:
The inlet water of the microbial electrolytic cell reactor can be provided with or without a pre-treatment process according to actual conditions. The pretreatment process generally comprises temperature regulation, water quality and water quantity regulation, pre-aeration, removal of large-particle pollutants (including grease matters) suspended in wastewater and the like, and the related equipment mainly comprises a grid machine, an oil and slag scraping machine, an adjusting tank, a sand setting tank, a primary sedimentation tank and the like. When the garbage leachate needs to be pretreated, a water inlet pump can be arranged at the water inlet end 1a of the microbial electrolytic cell reactor 1, the pretreated stock solution is stored in a pretreatment water tank, and enters the microbial electrolytic cell reactor 1 through the water inlet pump arranged at the water inlet end 1 a. The garbage leachate enters from the water inlet end 1a of the microbial electrolytic cell reactor 1 and flows out from the water outlet end 1 b.
The garbage leachate stock solution is treated by organic pollutants in a microbial electrolytic cell reactor 1: the hydraulic retention time of the microbial electrolytic cell reactor 1 is set to be 3 d-7 d, the operating temperature is 30-37 ℃, and the potential of 0.5-0.9V is provided by a direct current constant voltage power supply. The method of gradient increasing the COD concentration of the leachate inlet water is adopted to increase the operation load of the microbial electrolytic cell reactor 1, so that the microbial electrolytic cell reactor can still normally operate under the treatment load of more than 25-30 kg COD/(m 3.d).
When the COD of the liquid passing through the microbial electrolytic cell reactor 1 is removed by more than 80%, 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. A valve and a flowmeter can be arranged at the water inlet end 2a, the water inlet of the anoxic denitrification reactor 2 is controlled by the valve and the flowmeter according to actual demands, 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 electrolytic 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 3-7 d, the reaction temperature is 25-30 ℃, and the dissolved oxygen is 0.2-0.5 mg/L. At this stage, 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, wherein the water outlet end 2b is connected with the water inlet end 3a of the short-cut 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 further 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 to be uniformly mixed with the effluent of the short-cut nitrification reactor 3 and then enter the anaerobic ammonia oxidation reactor 4. Valves and flow meters can be respectively arranged at the water outlet ends 2b and 2c of the anoxic denitrification reactor 2, so that 60-80% of the water outlet amount of the anoxic denitrification reactor 2 is controlled to enter the short-cut 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 the ammonia nitrogen in the wastewater is oxidized to nitrous acid nitrogen in the aerobic short-cut nitrification reactor, and then the effluent of the short-cut nitrification reactor 3 (comprising generated nitrous acid nitrogen and unreacted ammonia nitrogen in the ratio of about 1:1) enters the intermediate water tank 5 through the water outlet end 3b or directly enters the anaerobic ammonia oxidation reactor 4 through the water inlet 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 nitrous acid nitrogen as an electron acceptor and ammonia nitrogen as a direct electron donor to generate nitrogen, so that the whole autotrophic denitrification of the ammonia nitrogen in the wastewater is realized. 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 water can be controlled to flow back to the water inlet end 2a of the anoxic denitrification reactor 2 through the return pipe 7 by virtue of valves and flow meters arranged at the water outlet end 4b and the water outlet end 4c, and the rest part is discharged as water outlet through the water outlet end 4 b.
As shown in figure 2, an Upflow Anaerobic Sludge Blanket (UASB) (purchased from Beijing Ying and Rui environmental protection engineering Co., ltd.) is used as a control reactor, and the effect of the device for removing COD is compared with that of the control reactor, so that the device for removing COD has better effect on sewage treatment, 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 was also greater than that of the control reactor.
The microbial electrolytic cell reactor refers to an anaerobic reaction generator which promotes anaerobic reaction through bioelectrochemical reaction and recovers energy substances and valuable products in the form of hydrogen, methane, ethanol, hydrogen peroxide and the like. In the above embodiment, by adding electrodes of different materials to the microbial electrolytic cell reactor, under the action of the applied potential, on one hand, the hydrogen production rate is improved, and the hydrogen can be used as an electron donor of methanogens, on the other hand, the zymogenic bacteria and the methanogens are enriched in the system, so that methane production is promoted.
In the above embodiment, the "anaerobic ammoxidation reactor" is generally a tank-type or tank-type structure, and the volume can be calculated by ammonia nitrogen removal, and the function of the anaerobic ammoxidation reactor is to convert nitrite nitrogen into nitrogen under anaerobic conditions, so as to remove total nitrogen in the final leachate. The design of the anoxic denitrification reactor and the short-cut nitrification reactor is the same as that of the nitrification denitrification reactor in the prior art, and the difference is that the residence time is shortened and the tank capacity is reduced. After stable operation in actual engineering, the dissolved oxygen is controlled to be 1-2 mg/l.
The sewage discharge standard referred by the invention is the sewage discharge urban sewer water quality standard (GB/T31962-2015) implemented by the method of 2016, 8 and 1, and the recycling standard has different requirements according to different recycling positions, such as: the open type circulating cooling water system in the water quality of the industrial water for recycling urban sewage GB/T19923-2005 is used for supplementing water. In addition, the standards for discharging sewage vary from region to 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 embodiments illustrate the main processing unit and design principle of the device of the present invention, but the water inlet and outlet modes, the reflux setting, the setting of valves and flow meters, etc. are not limited to the above description; the pre-treatment process and the subsequent advanced treatment process can be set or not according to the actual situation of the main device for treating the garbage leachate. In addition, the method is applicable to, but not limited to, treatment of landfill leachate, and can also be used for 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 appended claims should also be considered as falling within the scope of the present invention.
Claims (8)
1. The garbage leachate treatment device is characterized in that the device is formed by sequentially connecting four treatment units of a microbial electrolytic cell reactor (1), an anoxic denitrification reactor (2), a shortcut nitrification reactor (3) and an anaerobic ammoxidation reactor (4) in series through pipes:
The microbial electrolytic cell reactor (1) is provided with a garbage leachate water inlet end (1 a) and a garbage leachate water outlet end (1 b), and the water outlet end (1 b) of the microbial electrolytic cell reactor (1) is connected with the water inlet end (2 a) of the anoxic denitrification reactor (2); the water outlet end (2 b) of the anoxic denitrification reactor (2) is connected with the water inlet end (3 a) of the shortcut nitrification reactor (3); the water outlet end (3 b) of the short-cut nitrification reactor (3) is connected with the water inlet end (4 a) of the anaerobic ammonia oxidation reactor (4), the anaerobic ammonia oxidation reactor (4) is also provided with a water outlet end (4 b), the anaerobic ammonia oxidation reactor (4) is provided with a water outlet end (4 c) and a return pipe (6), one end of the return pipe (6) is connected with the water outlet end (4 c), and the other end is connected with the water inlet end (2 a) of the anoxic denitrification reactor (2);
An intermediate water tank is arranged between the water outlet end (1 b) and the water inlet end (2 a) or between the water outlet end (2 b) and the water inlet end (3 a);
The hydraulic retention time of the garbage leachate in the microbial electrolytic cell reactor (1) is 3-7 d, the operating temperature is 30-37 ℃, the direct current constant voltage power supply provides 0.5-0.9V potential, and the operating load of the microbial electrolytic cell reactor (1) is improved by adopting a method of gradient lifting the COD concentration of the garbage leachate inlet water, so that the microbial electrolytic cell reactor can still normally operate under the treatment load of more than 25-30 kg COD/(m 3 & d);
Electrodes made of different materials are additionally arranged in the microbial electrolytic cell reactor (1), under the action of an externally applied potential, the hydrogen production rate is improved, hydrogen is used as an electron donor of methanogen, and meanwhile fermentation bacteria and methanogen are enriched in a system to promote the generation of methane;
By adopting the treatment device for the garbage leachate, the COD (chemical oxygen demand) removal rate of the garbage leachate is more than 95%, the ammonia nitrogen removal rate is 100%, and the total nitrogen removal rate is more than 90%.
2. The device for treating landfill leachate according to claim 1, wherein the anoxic denitrification reactor (2) is provided with a water outlet end (2 c), and the water outlet end (2 c) is connected with a water inlet end (4 a) of the anaerobic ammoxidation reactor (4).
3. The garbage leachate treatment device according to claim 2, further comprising an intermediate water tank (5), wherein one end of the intermediate water tank (5) is connected to the water outlet end (2 c) of the anoxic denitrification reactor (2) and the water outlet end (3 b) of the short-range nitrification reactor (3), and the other end is connected to the water inlet end (4 a) of the anaerobic ammoxidation reactor (4).
4. A device for treating landfill leachate according to any of claims 1-3, wherein a return pipe (7) is arranged at the water outlet end (1 b) of the microbial cell reactor (1), one end of the return pipe (7) is connected with the water outlet end (1 b), and the other end is connected with the water inlet end (1 a) of the microbial cell reactor (1).
5. A device for treating waste leachate according to any of claims 1-3, characterized in that the water inlet end (1 a) of the microbial cell reactor (1) is connected to a pre-treatment tank.
6. The garbage leachate treatment device according to claim 5, wherein a water inlet pump is arranged between the water inlet end (1 a) of the microbial electrolytic cell reactor (1) and the pretreatment water tank.
7. A device for treating waste leachate according to any of claims 1-3, wherein one or more of the water inlet end (2 a), the water outlet end (2 b), the water outlet end (2 c), the water outlet end (3 b), the water outlet end (4 b) and the water outlet end (4 c) is/are provided with a water valve.
8. A device for treating landfill leachate according to any of claims 1-3, wherein one or more of the water inlet end (2 a), the water outlet end (2 b), the water outlet end (2 c), the water outlet end (3 b), the water outlet end (4 b) and the water outlet end (4 c) are provided with flow meters.
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| CN111362407A (en) * | 2020-03-20 | 2020-07-03 | 中国城市建设研究院有限公司 | Denitrification device and method for synchronously realizing nitrification and denitrification and anaerobic ammonia oxidation |
| CN112028254A (en) * | 2020-07-07 | 2020-12-04 | 光大环境科技（中国）有限公司 | Anaerobic ammonia oxidation treatment system and method based on self-denitrification waste gas |
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