CN115340186A - System and method for treating garbage leachate through multiple stable anaerobic ammonia oxidation process - Google Patents

System and method for treating garbage leachate through multiple stable anaerobic ammonia oxidation process Download PDF

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CN115340186A
CN115340186A CN202211019845.6A CN202211019845A CN115340186A CN 115340186 A CN115340186 A CN 115340186A CN 202211019845 A CN202211019845 A CN 202211019845A CN 115340186 A CN115340186 A CN 115340186A
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reactor
effluent
ammonia oxidation
anaerobic ammonia
storage tank
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王亚宜
刘嘉玮
汪涵
薛昊
王俊杰
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Tongji University
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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
    • C02F3/286—Anaerobic digestion processes including two or more steps
    • 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
    • C02F3/006—Regulation methods for biological treatment
    • 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
    • C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
    • 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
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2

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Abstract

The invention relates to the technical field of high ammonia nitrogen wastewater treatment, in particular to a system and a method for treating garbage leachate by a multiple stable anaerobic ammonia oxidation process. The invention firstly arranges a preorder anaerobic digestion unit to remove most biodegradable organic matters, and couples the sludge of the shortcut nitrification section to adsorb partial organic matters to provide a good autotrophic environment for a subsequent anaerobic ammonia oxidation unit; then regulating and controlling the mixing flow ratio of the effluent of the first regulation and storage tank which is not treated by the shortcut nitrification section and the effluent of the shortcut nitrification reactor based on the nitrogen ratio of the effluent of the shortcut nitrification reactor so as to stabilize the nitrogen ratio of the anaerobic ammonia oxidation inlet water and further ensure the smooth operation of the anaerobic ammonia oxidation reaction; meanwhile, part of the effluent of the anaerobic ammonia oxidation reactor flows back to the first regulation and storage tank for retreatment, which is beneficial to improving the operation stability and the total nitrogen removal rate of the system and has better engineering guiding significance for the denitrification treatment of the waste leachate.

Description

System and method for treating garbage leachate through multiple stable anaerobic ammonia oxidation process
Technical Field
The invention relates to the technical field of high ammonia nitrogen wastewater treatment, in particular to a system and a method for treating garbage leachate by a multiple stable anaerobic ammonia oxidation process.
Background
Since the development of the new technology, along with the continuous acceleration of the urbanization process, the output of municipal solid waste is continuously increased, wherein 45 percent of the waste is treated by incineration to generate a large amount of waste leachate of incineration plants. The waste leachate has the characteristics of high COD and ammonia nitrogen concentration, high content of toxic and harmful pollutants, large fluctuation of water quality and water quantity and the like, and belongs to one of waste water difficult to treat. Generally, the traditional biological treatment method (such as multi-stage nitrification/denitrification (A/O)) is adopted for removing ammonia nitrogen in the waste leachate, the aeration energy consumption is high, an organic carbon source needs to be added, and the requirement of realizing carbon neutralization in a sewage treatment plant is difficult to meet, so that a novel biological denitrification process needs to be urgently found.
Anaerobic ammonia oxidation is a novel denitrification process discovered in recent years, can reduce 100% of external carbon source, 60% of aeration rate and 80% of sludge yield, and is widely applied to denitrification treatment of high-ammonia nitrogen and low-COD/N wastewater. The anaerobic ammonia oxidation process based landfill leachate treatment has a high application prospect, but the following bottleneck problems still exist: 1) The organic matters in the waste leachate have obvious biological inhibition effect on the anammox bacteria; 2) Nitrogen ratio (NO) of water inlet of anaerobic ammonia oxidation section 2 - -N/NH 4 + -N) difficult to stabilize; 3) The total nitrogen removal of the anammox process is limited.
Firstly, the organic matter concentration in the garbage leachate is high, so that the growth rate of the anammox bacteria is lower than that of heterotrophic microorganisms and the anammox bacteria are eliminated, and some toxic and harmful organic matters (such as methanol, antibiotics, humic acid and the like) can also have obvious inhibiting effect on the anammox bacteria. Therefore, a preoperative anaerobic digestion process is usually required to remove organic matters, so that a proper denitrification environment is provided for anaerobic ammonium oxidation bacteria.
Secondly, the theory of anammox reactionTheory of NO 2 - -N/NH 4 + -N ratio 1.32:1, wherein NO 2 - the-N is usually generated by adopting a shortcut nitrification process, namely, the denitrification treatment of the wastewater is realized by a shortcut nitrification-anaerobic ammonia oxidation coupling process, but in the actual operation process, the operation effect of the shortcut nitrification is easily interfered by environmental factors such as fluctuation of the quality of inlet water and the like, so that NO in anaerobic ammonia oxidation inlet water 2 - -N/NH 4 + the-N ratio is difficult to stabilize at the theoretical stoichiometric ratio (1.32 4 + Or NO 2 - And the total nitrogen of the final effluent water quality does not reach the standard after the water is left. The adjustment of parameters such as hydraulic retention time, alkalinity, pH and the like are generally needed for stabilizing NO in anammox inflow water 2 - -N/NH 4 + The ratio of-N to-N and the control of short-cut nitrification have the disadvantages of inconvenient operation, high cost of added medicament and the like.
Furthermore, in addition to being influenced by environmental factors, anammox reactions also produce 11% NO 3 - Affecting the total nitrogen removal. Therefore, how to treat the waste leachate based on the anaerobic ammonia oxidation process, remove organic matters through pretreatment, stabilize the nitrogen ratio of inlet water of anaerobic ammonia oxidation in the running process, provide a good denitrification environment for anaerobic ammonia oxidation bacteria, and remove NO in outlet water 3 - This is of great importance to improve the operational stability of the system and the total nitrogen removal.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a system and a method for treating waste leachate by a multiple stable anaerobic ammonia oxidation process. The invention aims at the obvious biological inhibition effect of organic matters on the anaerobic ammonia oxidizing bacteria and the nitrogen ratio (NO) of water inlet of an anaerobic ammonia oxidizing section when the anaerobic ammonia oxidizing process is used for treating waste leachate 2 - -N/NH 4 + N) bottleneck problem difficult to stabilize, and provides a multiple stabilization strategy based on mixed flow ratio regulationThe ammonia oxidation unit provides a good autotrophic environment; then regulating and controlling the mixing flow ratio of the effluent of the first regulation and storage tank which is not treated by the shortcut nitrification section and the effluent of the shortcut nitrification reactor based on the nitrogen ratio of the effluent of the shortcut nitrification reactor so as to stabilize the nitrogen ratio of the anaerobic ammonia oxidation inlet water and further ensure the smooth operation of the anaerobic ammonia oxidation reaction; meanwhile, part of the effluent of the anaerobic ammonia oxidation reactor flows back to the first regulation and storage tank for retreatment, which is beneficial to improving the operation stability and the total nitrogen removal rate of the system and has better engineering guiding significance for the denitrification treatment of the waste leachate.
The purpose of the invention can be realized by the following technical scheme:
the first object of the invention is to provide a method for treating garbage leachate by a multiple stable anaerobic ammonia oxidation process, which comprises the following steps:
(S1) allowing the garbage leachate to enter an anaerobic digestion reactor for anaerobic digestion to remove organic matters, so as to obtain effluent of the anaerobic digestion reactor, and then allowing the effluent to flow into a first regulation and storage tank;
(S2) allowing the water outlet part of the first storage tank to flow into a short-cut nitrification reactor to remove part of organic matters, realizing stable short-cut nitrification by using a control strategy of coupling high FNA concentration and low DO, and carrying out reaction on NH 4 + Oxidation to NO 2 - The rest part is directly mixed with the effluent of the short-cut nitrification reactor and flows into a second regulating and storing tank;
(S3) the effluent of the second regulation and storage tank flows into an anaerobic ammonia oxidation reactor to synchronously remove NH 4 + And NO 2 - And further removing organic matters;
(S4) returning a part of the effluent of the anaerobic ammonia oxidation reactor to the first regulating storage tank through a return pipe to be mixed with the effluent of the anaerobic nitrification reactor, reducing the inflow load of the later section, improving the total nitrogen removal rate of the system, and discharging the rest of the effluent out of the treatment system.
In one embodiment of the invention, the pH in the short path nitration reactor is between 6.5 and 7.2; the dissolved oxygen concentration is 0.3-0.5mg/L, FNA is more than 0.08mg/L, so as to ensure the stable operation of short-range nitrification and the nitrite nitrogen accumulation rate (NAE) can reach more than 95 percent.
In one embodiment of the invention, the pH in the anammox reactor is in the range of 7.2 to 7.8; the dissolved oxygen concentration is lower than 0.5mg/L, and the total nitrogen removal rate (NRE) can reach more than 75 percent.
In one embodiment of the invention, the mixing ratio of the anaerobic digestion reactor effluent and the anaerobic ammonia oxidation reactor effluent in the first storage tank is more than or equal to 100 percent.
In one embodiment of the invention, in the second storage tank, the mixing flow ratio of the effluent of the first storage tank and the effluent of the short-cut nitrification reactor is 1:1.58-3.80, NO in the second storage tank 2 - -N/NH 4 + -the N ratio stabilizes at the ratio of the theoretical stoichiometries required for anammox, which is 1.32:1.
the second purpose of the invention is to provide a system for treating the waste leachate by a multiple stable anaerobic ammonia oxidation process, which comprises an anaerobic digestion reactor, a first regulating and storing tank, a shortcut nitrification reactor, a second regulating and storing tank and an anaerobic ammonia oxidation reactor,
the effluent of the anaerobic digestion reactor enters a first regulation and storage tank; the water discharged from the first storage tank is divided into two paths, one path enters the short-cut nitrification reactor, and the other path enters the second storage tank; the effluent of the short-cut nitrification reactor enters a second regulating storage tank; the effluent of the second regulation and storage tank enters an anaerobic ammonia oxidation reactor; the effluent of the anaerobic ammonia oxidation reactor is divided into two paths, one path of effluent flows back to the first regulation and storage tank, and the other path of effluent is directly discharged;
the anaerobic digestion reactor is used for removing part of organic matters in the garbage leachate through anaerobic digestion;
the first regulation and storage tank is used for homogenizing water quality and uniformly mixing effluent of the anaerobic digestion reactor and water refluxed by the anaerobic ammonia oxidation reactor;
the short-cut nitration reactor is used for reacting NH 4 + Oxidation to NO 2 - And removing part of organic matters;
the second regulating and storing tank is used for homogenizing water quality and uniformly mixing the effluent of the first regulating and storing tank and the effluent of the short-cut nitrification reactor;
the anammoxReactor for NH removal 4 + 、NO 2 - And further removing organic matters.
In one embodiment of the invention, the anaerobic digestion reactor comprises an anaerobic digestion reactor water inlet pipe, a reaction zone, a settling zone, an exhaust pipe and an anaerobic digestion reactor water outlet pipe, wherein the reaction zone is arranged at the bottom of the settling zone, a water distributor is arranged at the bottom of the reaction zone and is connected with the anaerobic digestion reactor water inlet pipe, a three-phase separator is arranged at the position, close to the reaction zone, of the settling zone, an exhaust pipe is arranged at the top of the three-phase separator, the top of the settling tank is designed as an overflow weir, and an anaerobic digestion reactor outlet is arranged on the side wall of the settling zone above an inlet of the exhaust pipe and below the overflow weir and is connected with the first regulation tank.
In one embodiment of the invention, the anaerobic digestion reactor water inlet pipe is provided with a first water inlet peristaltic pump for controlling the garbage leachate flow.
In one embodiment of the invention, the water distributor is used to more evenly react the waste leachate flowing into the anaerobic digestion reactor.
In one embodiment of the invention, the three-phase separator is used for separating solid-liquid-gas products after anaerobic digestion reaction of the waste leachate, wherein the solid products are precipitated in the reaction zone from the precipitation zone, the liquid products enter the precipitation zone from the reaction zone, and the gaseous products are discharged through the exhaust pipe right above the three-phase separator.
In one embodiment of the invention, the first pre-treatment solution after the waste leachate is treated by the anaerobic digestion reactor is discharged into the first storage tank through a water outlet pipe of the anaerobic digestion reactor after passing through the overflow weir.
In one embodiment of the invention, a first regulating reservoir water outlet pipe is arranged at the first regulating reservoir water outlet, and the first regulating reservoir water outlet end is respectively connected with a short-cut nitrification reactor water inlet pipe and an overrun pipe;
a second water inlet peristaltic pump is arranged on the water inlet pipe of the short-cut nitrification reactor;
and a third water inlet peristaltic pump is arranged on the overrunning pipe.
In one embodiment of the invention, an aeration pipe, a first stirring device and a first pH and dissolved oxygen real-time online monitor are arranged in the short-cut nitrification reactor; the aeration pipe is arranged at the bottom of the short-cut nitrification reactor and is matched with an external air compressor.
In one embodiment of the invention, the air compressor is used for supplying air to the short-cut nitrification reactor through the aeration pipe so as to supply oxygen;
the aeration pipe is used for transferring air provided by the air compressor;
the first stirring device is used for stirring and supplying oxygen on one hand, and is used for uniformly mixing the reaction solution in the short-cut nitrification reactor on the other hand;
the first pH and dissolved oxygen real-time online monitor is used for monitoring the pH and the dissolved oxygen concentration of the reaction solution in the shortcut nitrification reactor in real time.
In one embodiment of the present invention, the pH of the reaction solution in the short-cut nitrification reactor is adjusted by adding an acid or a base, and the dissolved oxygen concentration of the reaction solution in the short-cut nitrification reactor is adjusted by the air supply amount of the air compressor.
In one embodiment of the invention, the outlet of the short-cut nitrification reactor is connected with the water outlet pipe of the short-cut nitrification reactor, and the water outlet pipe of the short-cut nitrification reactor is provided with a first water outlet peristaltic pump and is connected with the water inlet pipe of the second storage tank.
In one embodiment of the invention, the water outlet of the second storage tank is connected with the water inlet pipe of the anaerobic ammonia oxidation reactor; and a fourth water inlet peristaltic pump is arranged on the water inlet pipe of the anaerobic ammonia oxidation reactor.
In one embodiment of the invention, the anaerobic ammonia oxidation reactor is provided with a second stirring device and a second real-time online pH and dissolved oxygen monitor.
In one embodiment of the invention, the second stirring device is used for uniformly mixing the reaction solution in the anaerobic ammonia oxidation reactor;
the second pH and dissolved oxygen real-time on-line monitor is used for monitoring the pH and the dissolved oxygen concentration of the reaction solution in the anaerobic ammonia oxidation reactor in real time.
In one embodiment of the invention, the outlet of the anaerobic ammonia oxidation reactor is connected with the outlet pipe of the anaerobic ammonia oxidation reactor, and the anaerobic ammonia oxidation reactor is respectively connected with a return pipe and an external treatment pipe; the return pipe is connected with the first storage tank; along the backflow direction of backflow water (anaerobic ammonia oxidation reactor effluent), a flow monitor and a backflow pump are arranged on the backflow pipe.
In one embodiment of the invention, the flow monitor is used for detecting the flow of the return water, and the return pump is used for regulating and controlling the flow of the return water.
In one embodiment of the invention, the leachate treatment system connects the first regulation tank, the short-cut nitrification reactor, the second regulation tank and the anaerobic ammonia oxidation reactor into a circulating system through a reflux pump, a flow monitor and a reflux pipe.
In one embodiment of the invention, the anaerobic digestion reactor is carbon-depleted and the pH of the waste leachate is in the range of 7.8 to 8.6.
In one embodiment of the invention, the waste leachate treatment system has an average NRE of approximately 90%.
The technical principle is as follows:
a system and a method for treating waste leachate by a multiple stable anaerobic ammonia oxidation process based on mixed flow ratio regulation and control are disclosed, the waste leachate after pretreatment firstly flows into an anaerobic digestion reactor to remove half of organic matters (mainly organic matters easy to biodegrade), effluent flows into a first regulation and storage tank to be mixed with part of refluxed effluent of the anaerobic ammonia oxidation reactor, and the water inlet load of the rear section is reduced; part of the effluent of the first regulating reservoir flows into the short-cut nitrification reactor, and the rest of the effluent of the first regulating reservoir (the effluent of the first regulating reservoir surpasses) is mixed with the effluent of the short-cut nitrification reactor and flows into a second regulating reservoir; removing part of residual organic matter (mainly refractory macromolecular organic matter such as humic acid) in the short-cut nitrification reactor, and controlling short-cut nitrification by adjusting DO and FNA concentrations to remove NH 4 + Stabilized oxidation to NO 2 - (ii) a NO in effluent based on short-cut nitrification reactor 2 - -N/NH 4 + Regulating and controlling the mixing flow ratio of the surpassed effluent of the first regulation and storage tank and the effluent of the partial nitrification reactor by using the-N ratio to stabilize NO in the influent of the anaerobic ammonia oxidation reactor 2 - -N/NH 4 + N1.32, NH 4 + And NO 2 - The residual organic matters can be further removed simultaneously; one part of the effluent of the anaerobic ammonia oxidation reactor is directly discharged, and the other part of the effluent flows back to the first regulation and storage tank to be mixed with the effluent of the anaerobic digestion reactor, so that the water inlet load of the rear section of the first regulation and storage tank can be reduced, the stable operation of the system is ensured, and meanwhile, the effluent flows back to be further treated, the total nitrogen removal rate of the system can be improved, and the high-efficiency stable treatment of carbon removal and denitrification of the landfill leachate is realized.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention can realize the organic matters and NH in the garbage leachate by coupling three processes of anaerobic digestion, shortcut nitrification and anaerobic ammonia oxidation and refluxing part of the effluent of the anaerobic ammonia oxidation reactor 4 + The high-efficiency removal of the nitrogen is realized, and the operation stability and the total nitrogen removal rate of the system are ensured;
(2) Compared with the traditional leachate decarbonization and denitrification process (anaerobic digestion-multi-stage nitrification and denitrification), the method has the advantages of energy conservation and high efficiency, and can save 25% of aeration amount, 50% of electric energy and 100% of additional carbon source;
(3) The invention reduces the organic matter concentration through anaerobic digestion, partial nitrification and anaerobic ammonia oxidation in multiple stages, and obviously reduces the organic matter concentration and the Biochemical Oxygen Demand (BOD) of the effluent 5 COD) to weaken the influence of organic matters on a subsequent autotrophic nitrogen removal system;
(4) According to the invention, the pH and DO real-time online monitoring equipment is arranged in the short-cut nitrification reactor, so that the pH and DO are monitored in real time to control the FNA and DO concentrations, and the stable operation of short-cut nitrification is ensured;
(5) In the second regulation reservoir of the invention, NO is produced in the effluent based on short-cut nitrification 2 - -N/NH 4 + -N ratio regulation of mixed flow of excess effluent and short-cut nitrification effluent of first regulation and storage tankIn a quantitative ratio to stabilize NO in the feed water of the anammox reactor 2 - -N/NH 4 + N is approximately equal to 1.32, and the method provides a proper nitrogen element ratio for the anammox bacteria, and is favorable for improving the treatment efficiency of the anammox.
In a word, the waste leachate passes through the treatment system of the invention and is treated by means of corresponding multiple stabilization strategies, namely 1) arranging a preorder anaerobic digestion unit to remove most biodegradable organic matters, and coupling a partial organic matter adsorption function of the sludge in the shortcut nitrification section to provide a good autotrophic environment for a subsequent anaerobic ammonia oxidation unit; 2) Regulating and controlling the mixed flow ratio of the excess effluent and the short-cut nitrification effluent of the first regulation and storage tank based on the nitrogen ratio of the short-cut nitrification effluent to stabilize the nitrogen ratio of the anaerobic ammonia oxidation influent; 3) Part of the effluent of the anaerobic ammonia oxidation reactor flows back to the first regulation and storage tank for retreatment, which is favorable for improving the operation stability of anaerobic ammonia oxidation and strengthening the carbon and nitrogen removal efficiency of the system.
Drawings
Fig. 1 is a schematic view of a waste leachate treatment system used in the present invention;
FIG. 2 shows BOD of feed water of an anaerobic digestion reactor in the reaction process of the embodiment of the invention 5 COD, DOC concentration, BOD of effluent 5 COD, DOC concentration, and BOD 5 A COD and DOC removal rate change diagram;
FIG. 3 shows water NH entering the shortcut nitrification reactor in the reaction process of the embodiment of the present invention 4 + -N、BOD 5 COD concentration, effluent NH 4 + -N、NO 2 - -N、NO 3 - -N、BOD 5 COD concentration, and NAE, NRE and BOD 5 A COD removal rate change chart;
FIG. 4 shows the feed water NH of the anammox reactor during the reaction of the example of the present invention 4 + -N、NO 2 - -N、BOD 5 COD concentration, effluent NH 4 + -N、NO 2 - -N、NO 3 - -N、BOD 5 COD concentration, and NRE and BOD 5 A COD removal rate change graph;
the reference numbers in the figures: 1. an anaerobic digestion reactor; 2. a first regulation and storage tank; 3. a short-cut nitrification reactor; 4. a second regulation and storage tank; 5. an anammox reactor; 6. a first water inlet peristaltic pump; 7. a water inlet pipe of the anaerobic digestion reactor; 8. a water distributor; 9. a reaction zone; 10. a three-phase separator; 11. a settling zone; 12. an exhaust pipe; 13. an overflow weir; 14. a water outlet pipe of the anaerobic digestion reactor; 15. a water outlet pipe of the first regulating storage tank; 16. a water inlet pipe of the short-cut nitrification reactor; 17. a second water inlet peristaltic pump; 18. a third water inlet peristaltic pump; 19. a overrunning tube; 20. a first stirring device; 21. a first pH and dissolved oxygen real-time online monitor; 22. an aeration pipe; 23. an air compressor; 24. a first water outlet peristaltic pump; 25. a water outlet pipe of the short-cut nitrification reactor; 26. a water inlet pipe of the second storage tank; 27. a fourth water inlet peristaltic pump; 28. an anaerobic ammonia oxidation reactor water inlet pipe; 29. a second stirring device; 30. a second pH and dissolved oxygen real-time online monitor; 31. a second water outlet peristaltic pump; 32. an anaerobic ammonia oxidation reactor water outlet pipe; 33. a reflux pump; 34. a flow monitor; 35. a return pipe.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
In the present invention, the terms "first" and "second" are used only for descriptive distinction and not for special purposes. In the following examples, all reagents used are commercially available reagents unless otherwise specified; the detection means and the method are conventional detection means and methods in the field.
Example 1
The embodiment provides a system for treating landfill leachate through a multiple-stability anaerobic ammonia oxidation process based on mixed flow ratio regulation, which is shown in fig. 1 and comprises an anaerobic digestion reactor 1, a first regulation and storage tank 2, a shortcut nitrification reactor 3, a second regulation and storage tank 4 and an anaerobic ammonia oxidation reactor 5;
the anaerobic digestion reactor 1 is provided with a first water inlet peristaltic pump 6, an anaerobic digestion reactor water inlet pipe 7, a water distributor 8, a reaction zone 9, a three-phase separator 10, a settling zone 11, an exhaust pipe 12, an overflow weir 13 and an anaerobic digestion reactor water outlet pipe 14;
the first regulation and storage tank 2 is provided with a first regulation and storage tank water outlet pipe 15, a third water inlet peristaltic pump 18 and an overrunning pipe 19;
the short-cut nitrification reactor 3 is provided with a short-cut nitrification reactor water inlet pipe 16, a second water inlet peristaltic pump 17, a first stirring device 20, a first pH and dissolved oxygen real-time online monitor 21, an aeration pipe 22, an air compressor 23, a first water outlet peristaltic pump 24 and a short-cut nitrification reactor water outlet pipe 25;
the regulating storage tank is provided with a second regulating storage tank water inlet pipe 26;
the anaerobic ammonia oxidation reactor 5 is provided with a fourth water inlet peristaltic pump 27, an anaerobic ammonia oxidation reactor water inlet pipe 28, a second stirring device 29, a second pH and dissolved oxygen real-time online monitor 30, a second water outlet peristaltic pump 31, an anaerobic ammonia oxidation reactor water outlet pipe 32, a reflux pump 33, a flow monitor 34 and a reflux pipe 35;
the reaction zone 9 is arranged at the bottom of the sedimentation zone 11, the water distributor 8 is arranged at the bottom of the reaction zone 9 and is connected with a water inlet pipe 7 of the anaerobic digestion reactor, a first water inlet peristaltic pump 6 for controlling the flow of the garbage leachate is arranged on the water inlet pipe 7 of the anaerobic digestion reactor, a three-phase separator 10 is arranged at the position of the sedimentation zone 11 close to the reaction zone 9, an exhaust pipe 12 is arranged at the top of the three-phase separator 10, the top of the sedimentation tank is designed to be an overflow weir 13, an outlet of the anaerobic digestion reactor 1 is arranged above the inlet of the exhaust pipe 12 and on the side wall of the sedimentation zone 11 below the overflow weir 13 and is connected with the first regulation and storage tank 2 through an outlet pipe 14 of the anaerobic digestion reactor;
a water outlet of the first regulation and storage tank 2 is provided with a first regulation and storage tank water outlet pipe 15, and the water outlet end of the first regulation and storage tank 2 is respectively connected with a short-cut nitrification reactor water inlet pipe 16 and an overrun pipe 19; wherein, a second water inlet peristaltic pump 17 is arranged on the water inlet pipe 16 of the short distance nitration reactor, and a third water inlet peristaltic pump 18 is arranged on the surpassing pipe 19;
an aeration pipe 22, a first stirring device 20 and a first pH and dissolved oxygen real-time online monitor 21 are arranged in the short-cut nitrification reactor 3; the aeration pipe 22 is arranged at the bottom of the short-cut nitrification reactor 3 and is matched with an external air compressor 23; the outlet of the short-cut nitrification reactor 3 is connected with a water outlet pipe 25 of the short-cut nitrification reactor, and the water outlet pipe 25 of the short-cut nitrification reactor is provided with a first water outlet peristaltic pump 24 and is connected with a water inlet pipe 26 of a second regulation and storage tank; the water outlet of the second storage tank 4 is connected with the water inlet pipe 28 of the anaerobic ammonia oxidation reactor; a fourth water inlet peristaltic pump 27 is arranged on the water inlet pipe 28 of the anaerobic ammonia oxidation reactor;
the anaerobic ammonia oxidation reactor 5 is provided with a second stirring device 29 and a second pH and dissolved oxygen real-time online monitor 30, the outlet of the anaerobic ammonia oxidation reactor 5 is connected with an anaerobic ammonia oxidation reactor water outlet pipe 32, and the anaerobic ammonia oxidation reactor 5 is respectively connected with a return pipe 35 and an external treatment pipe; the return pipe 35 is connected to the first reservoir 2, and the flow monitor 34 and the return pump 33 are provided on the return pipe 35 in the return direction of the return water.
The leachate treatment system connects the first regulating reservoir 2, the shortcut nitrification reactor 3, the second regulating reservoir 4 and the anaerobic ammonia oxidation reactor 5 into a circulating system through a reflux pump 33, a flow monitor 34 and a reflux pipe 35.
Example 2
The embodiment provides a process flow for treating waste leachate by a multiple-stability anaerobic ammonia oxidation process based on mixed flow ratio regulation, which comprises the following steps of:
(S1) the garbage leachate enters an anaerobic digestion reactor 1 through a first water inlet peristaltic pump 6 and an anaerobic digestion reactor water inlet pipe 7, the garbage leachate carries out anaerobic digestion reaction (carbon treatment is carried out to remove organic matters) in the anaerobic digestion reactor 1 to obtain a solid-liquid-gas product, wherein the solid gradually sinks to a reaction zone 9, the gas is discharged through an exhaust pipe 12, and the liquid level of the effluent of the anaerobic digestion reactor 1 is higher than that of an overflow weir 13 and then flows into a first regulation and storage tank 2 through an anaerobic digestion reactor water outlet pipe 14;
(S2) the effluent of the anaerobic digestion reactor 1 enters a first storage tank 2, the water quality is homogenized for a period of time, a part of the effluent enters a short-cut nitrification reactor 3 through a short-cut nitrification reactor inlet pipe 16 under the action of a second inlet peristaltic pump 17 through a first storage tank outlet pipe 15, in the short-cut nitrification reactor 3, air provided by an external air compressor 23 enters the short-cut nitrification reactor 3 through an aeration pipe 22 and is communicated with a first stirring device 20 to control the dissolved oxygen concentration to be 0.3-0.5mg/L, meanwhile, acid and alkali are added to control the pH of second pretreatment liquid to be 6.5-7.2, FNA is more than 0.08mg/L, the pH and the dissolved oxygen solubility are monitored by a first pH and dissolved oxygen real-time online monitor 21, the first stirring device 20 stirs the effluent of the first storage tank 2 to enable the reaction to be more thorough, the effluent of the short-cut nitrification reactor 3 enters a second storage tank inlet pipe 26 through a short-cut nitrification reactor outlet pipe 25 under the action of a first outlet peristaltic pump 24, and further enters a second storage tank 4 through a second storage tank 26;
(S3) the other part of the waste water enters the second regulating reservoir 4 through the surpassing pipe 19 and the second regulating reservoir water inlet pipe 26 under the action of the third inlet water peristaltic pump 18; the effluent of the first regulation and storage tank 2 and the effluent of the shortcut nitrification reactor 3 are uniformly mixed in a second regulation and storage tank 4, and the effluent of the second regulation and storage tank 4 enters an anaerobic ammonia oxidation reactor 5 through an anaerobic ammonia oxidation reactor water inlet pipe 28 under the action of a fourth water inlet peristaltic pump 27;
(S4) the pH of the fourth pretreatment liquid can be controlled to be 7.2-7.8 by adding acid and alkali, the concentration of dissolved oxygen is lower than 0.5mg/L, the pH and the concentration of dissolved oxygen are monitored by a second pH and dissolved oxygen real-time online monitor 30, the effluent of the second regulation and storage tank 4 is subjected to an anaerobic ammonia oxidation reaction to obtain the effluent of the anaerobic ammonia oxidation reactor 5, a part of the effluent of the anaerobic ammonia oxidation reactor 5 is refluxed to the first regulation and storage tank 2 through a reflux pipe 35 under the action of a reflux pump 33 and is mixed with the effluent of the anaerobic digestion reactor 1 (the flow of the reflux pipe 35 is monitored by a flow monitor 34 in real time), the inflow load of the later stage is reduced, the total nitrogen removal rate is further improved, and the rest part of the effluent is discharged out of the treatment system.
Wherein, the effluent of the anaerobic digestion reactor 1 is mixed with the effluent of the anaerobic ammonia oxidation reactor 5 at the reflux part, and the mixing ratio is more than or equal to 100 percent; NO in effluent of short-cut nitration reactor 3 2 - -N/NH 4 + The N ratio is 2.36-8.17, and the mixing ratio of the effluent of the first regulation and storage tank 2 and the effluent of the short-cut nitrification reactor 3 is regulated and controlled based on the nitrogen ratio of the effluent of the short-cut nitrification reactor 3 (the actual mixing ratio regulation and control range is 1.58-3.80), so as to stabilize NO in the effluent of the second regulation and storage tank 4 2 - -N/NH 4 + -N is 1.14-1.42:1, NRE can reach more than 75 percent.
Example 3
As shown in FIG. 1, the anaerobic reactor of this embodimentThe digestion reactor 1 adopts an up-flow anaerobic sludge bed reactor (UASB) with the effective volume of 6L, the flow rate is 1L/d, the Hydraulic Retention Time (HRT) is 6d, and water is fed into the reactor NH 4 + -N is 1100-2000mg/L, pH is 7.8-8.6, temperature is 36.0 + -2.0 ℃, sludge concentration (MLVSS) in the inoculated anaerobic digestion sludge bed reactor is about 20g/L, and the inoculated anaerobic digestion sludge bed reactor contains a large amount of inorganic particles. The operation effect is shown in figure 2 (1-23 d), the effluent quality of the leachate is stable, the concentration of organic pollutants is obviously reduced, and BOD at the end stage 5 COD and DOC are respectively reduced to 1130mg/L, 3470mg/L and 586mg/L, average BOD 5 The removal rates of COD and DOC are respectively 58.2 +/-5.8%, 49.5 +/-5.5% and 51.1 +/-7.3%. The sludge loss rate is low, and the influence of inorganic particles deposited at the bottom of the anaerobic digestion sludge bed reactor on anaerobic digestion is small. BOD in the effluent 5 COD is 0.40 +/-0.04, COD/NH 4 + the-N is reduced to 3.3 +/-1.0, the concentration of organic matters is lower, the biodegradability of the effluent is further reduced, and the influence on a subsequent autotrophic nitrogen removal system is smaller.
The short-cut nitrification reactor 3 adopts a Sequencing Batch Reactor (SBR) with the effective volume of 2L, the inlet water adopts 50 percent of tap water to dilute the outlet water of the anaerobic digestion reactor 1, the flow rate is 2L/d, the flushing ratio is 50 percent, the single-cycle time length is 12h, the HRT is 24h, the pH value is 6.8-7.2, the temperature is 32.0 +/-2.0 ℃, the MLVSS is 4.10-4.50g/L, the VSS/TSS value is 0.90-0.92, the DO is 0.3-0.5mg/L, FNA>0.08mg/L. The operation effect is shown in FIG. 3 (1-23 d), the average NAE is 95.6 + -1.5%, the NRE is 9.0 + -4.1%, BOD 5 The removal rates of COD and water are respectively 59.1 +/-4.7 percent and 43.8 +/-6.4 percent, and NO in the effluent of the short distance nitration reactor 3 2 - -N/NH 4 + the-N ratio is 2.62 +/-0.26, which shows that the carbon removal and the nitrogen removal are simultaneously realized, the activity of nitrite oxidizing bacteria is obviously inhibited, and the NO in effluent is 2 - -N/NH 4 + the-N comparison is stable.
The anaerobic ammonia oxidation reactor 5 adopts an SBR reactor with the effective volume of 2.5L, and based on the nitrogen ratio of the short-cut nitrification effluent, the mixing ratio of the effluent of the first regulation and storage tank 2 to the effluent of the short-cut nitrification reactor 3 is regulated to be 1:3.5 +/-0.3, inflow rate of 2L/d, flushing ratio of 50%, single-cycle duration of 12h, HRT of 30h, inflow pH of 7.2-7.5 and temperature of34.0 +/-0.5 ℃, 1.65-2.00g/L of MLVSS, 0.80-0.90 of VSS/TSS value 2 - -N/NH 4 + The ratio N is 1.27. + -. 0.10. The operational results are shown in FIG. 4 (1-23 d), with an average NRE of 78.9. + -. 5.1% and an end-of-run NH effluent 4 + -N、NO 2 - -N and NO 3 - The N concentration is 42mg/L, 50mg/L and 26mg/L respectively, which indicates that the anaerobic ammonia oxidation is stable; stoichiometric ratio delta NO 2 - -N/ΔNH 4 + -N and Δ NO 3 - -N/ΔNH 4 + N is 1.33 + -0.17 and 0.13 + -0.03 respectively, and delta NO 2 - -N/ΔNH 4 + N is close to the theoretical stoichiometric ratio of 1.32 of anaerobic ammonia oxidation, delta NO 3 - -N/ΔNH 4 + N is slightly lower than the theoretical stoichiometric ratio of 0.26, and denitrification is presumed to be cooperated with denitrification; average BOD 5 And COD removal rate reaches 42.8 +/-9.5% and 17.4 +/-4.0%, which shows that the concentration of organic matters in the effluent is further reduced on the basis of high-efficiency denitrification in the anaerobic ammonia oxidation section.
Example 4
In addition to example 3, in order to increase the treatment load, the effluent from the anaerobic digestion reactor 1 and the effluent from the anaerobic ammonia oxidation reactor 5 were mixed in the first storage tank 2 in the ratio of 1:1 while reducing the system process flow and extending the reaction time.
The anaerobic digestion reactor 1 of example 4 employed a UASB reactor having an effective volume of 6L, a flow rate of 0.5L/d, an HRT of 12d, and feed water NH 4 + 1100-2000mg/L of N, 7.8-8.6 of pH value, 36.0 +/-2.0 ℃ of temperature and about 20g/L of MLVSS. The operation effect is shown in figure 2 (24-72 d), the effluent leachate has stable water quality, the concentration of organic pollutants is remarkably reduced, the COD at the end stage is reduced to 2090-3224mg/L, and the average BOD 5 The removal rates of COD and DOC are respectively 54.5 +/-3.6%, 42.7 +/-3.2% and 51.9 +/-3.4%. BOD in the effluent 5 COD is 0.40 +/-0.04 4 + the-N is reduced to 2.2 +/-0.2, the concentration of organic matters is lower, the biodegradability of the effluent is further reduced, and the influence on a subsequent autotrophic nitrogen removal system is smaller.
The short-cut nitrification reactor 3 adopts SBR with the effective volume of 2LThe water inlet of the reactor is mixed by refluxing 50 percent of the effluent of the anaerobic digestion reactor 1 and 50 percent of the effluent of the anaerobic ammonia oxidation reactor 5, the flow rate is 1L/d, the flushing ratio is 50 percent, the single-cycle time length is 12h, the HRT is 48h, and the total Nitrogen Load (NLR) is 0.21-0.33 kg-N/(m 3 D), pH 6.8-7.2, temperature 32.0. + -. 2.0 ℃, MLVSS 3.80-4.10g/L, VSS/TSS 0.90-0.92, DO 0.3-0.5mg/L, FNA>0.08mg/L. The operation effect is shown in figure 3 (24-72 d), the average NAE is 97.1 +/-0.7%, the NRE is 6.6 +/-2.0%, the removal rates of BOD and COD are 72.8 +/-4.2% and 54.4 +/-2.0% respectively, and NO in the effluent water 2 - -N/NH 4 + the-N ratio is 7.28 +/-0.89, which shows that the carbon removal and the nitrogen removal are simultaneously realized, the activity of nitrite oxidizing bacteria is obviously inhibited, and the NO in effluent is 2 - -N/NH 4 + the-N comparison is stable.
The anaerobic ammonia oxidation reactor 5 adopts an SBR reactor with the effective volume of 2.5L, and the mixing ratio of the effluent of the first regulation and storage tank 2 to the effluent of the shortcut nitrification reactor 3 is regulated and controlled to be 1 based on the nitrogen ratio of the effluent of the shortcut nitrification reactor 3: 1.78 +/-0.20, water inlet flow of 1L/d, flushing ratio of 50%, single-cycle duration of 12h, HRT of 60h, NLR of 0.19-0.25 kg-N/(m) 3 D), pH 7.2-7.5, temperature 34.0. + -. 0.5 ℃, MLVSS 2.00-2.10g/L, VSS/TSS 0.80-0.90 2 - -N/NH 4 + The N ratio is 1.28. + -. 0.14. The operation effect is shown in figure 4 (24-72 d), the average NRE is 77.8 +/-2.4%, and the anaerobic ammonia oxidation is stable; stoichiometric ratio delta NO 2 - -N/ΔNH 4 + -N and Δ NO 3 - -N/ΔNH 4 + N is 1.34. + -. 0.13 and 0.15. + -. 0.02 respectively, Δ NO 2 - -N/ΔNH 4 + N is close to the theoretical stoichiometric ratio of 1.32 of anaerobic ammonia oxidation, delta NO 3 - -N/ΔNH 4 + N is slightly lower than the theoretical stoichiometric ratio of 0.26, and denitrification is presumed to be cooperated with denitrification; mean BOD 5 And the COD removal rate reaches 27.7 +/-13.1 percent and 11.8 +/-3.7 percent, which shows that the concentration of the organic matters in the effluent is further reduced on the basis of more efficient denitrification in the anaerobic ammonia oxidation section.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. A method for treating garbage leachate by a multiple stable anaerobic ammonia oxidation process is characterized by comprising the following steps:
(S1) allowing the garbage leachate to enter an anaerobic digestion reactor for anaerobic digestion to remove organic matters, so as to obtain effluent of the anaerobic digestion reactor, and then allowing the effluent to flow into a first regulation and storage tank;
(S2) the effluent part of the first regulating storage tank flows into a short distance nitration reactor to remove partial organic matters, and meanwhile, a control strategy of coupling high FNA concentration with low dissolved oxygen is utilized to realize stable short distance nitration, so that NH is generated 4 + Oxidation to NO 2 - The rest part is directly mixed with the effluent of the short-cut nitrification reactor and flows into a second regulating storage tank;
(S3) the effluent of the second regulating storage tank flows into an anaerobic ammonia oxidation reactor to synchronously remove NH 4 + And NO 2 - And further removing organic matters;
(S4) returning a part of the effluent of the anaerobic ammonia oxidation reactor to the first regulating storage tank through a return pipe to be mixed with the effluent of the anaerobic nitrification reactor, reducing the water inlet load of the rear section, improving the total nitrogen removal rate of the system, and discharging the rest of the effluent of the anaerobic ammonia oxidation reactor to the treatment system.
2. The method for the multiple stable anaerobic ammonia oxidation process for the treatment of landfill leachate according to claim 1, wherein the pH in the shortcut nitrification reactor is 6.5-7.2; the concentration of dissolved oxygen is 0.3-0.5mg/L, and FNA is more than 0.08mg/L.
3. The method of claim 1, wherein the anaerobic ammonia oxidation reactor has a pH of 7.2 to 7.8; the dissolved oxygen concentration is less than 0.5mg/L.
4. The method for treating landfill leachate through the multiple stable anaerobic ammonia oxidation process according to claim 1, wherein the mixing ratio of the effluent of the anaerobic digestion reactor to the effluent of the anaerobic ammonia oxidation reactor in the first storage tank is not less than 100%.
5. The method for treating landfill leachate through the multiple stable anaerobic ammonia oxidation process according to claim 1, wherein in the second storage tank, the mixing flow ratio of the effluent of the first storage tank to the effluent of the shortcut nitrification reactor is 1:1.58-3.80, NO in the second storage tank 2 - -N/NH 4 + -the N ratio is stabilized at the ratio of the theoretical stoichiometries required for anammox, which is 1.32:1.
6. a system for treating landfill leachate by a multiple stable anaerobic ammonia oxidation process is characterized by comprising an anaerobic digestion reactor, a first regulation and storage tank, a shortcut nitrification reactor, a second regulation and storage tank and an anaerobic ammonia oxidation reactor,
the effluent of the anaerobic digestion reactor enters a first regulation and storage tank; the water outlet of the first regulating and storing tank is divided into two paths, one path enters the short-cut nitrification reactor, and the other path enters the second regulating and storing tank; the effluent of the short-cut nitrification reactor enters a second regulating storage tank; the effluent of the second regulating storage tank enters an anaerobic ammonia oxidation reactor; the effluent of the anaerobic ammonia oxidation reactor is divided into two paths, one path of effluent flows back to the first regulation and storage tank, and the other path of effluent is directly discharged;
the anaerobic digestion reactor is used for removing part of organic matters in the garbage leachate through anaerobic digestion;
the first regulating and storing tank is used for homogenizing water quality and uniformly mixing effluent of the anaerobic digestion reactor and water refluxed by the anaerobic ammonia oxidation reactor;
the short-cut nitrification and denitrificationThe reactor is used for reacting NH 4 + Oxidation to NO 2 - And removing part of organic matters;
the second regulating and storing tank is used for homogenizing water quality and uniformly mixing the effluent of the first regulating and storing tank and the effluent of the short-cut nitrification reactor;
the anaerobic ammonia oxidation reactor is used for removing NH 4 + 、NO 2 - And further removing organic matters.
7. The system for treating landfill leachate through the multiple stable anammox process according to claim 6, wherein the anaerobic digestion reactor comprises an anaerobic digestion reactor water inlet pipe, a reaction zone, a settling zone, an exhaust pipe and an anaerobic digestion reactor water outlet pipe, the reaction zone is arranged at the bottom of the settling zone, the bottom of the reaction zone is provided with a water distributor and is connected with the anaerobic digestion reactor water inlet pipe, a three-phase separator is arranged at a position of the settling zone close to the reaction zone, the top of the three-phase separator is provided with the exhaust pipe, the top of the settling tank is designed as an overflow weir, and an outlet of the anaerobic digestion reactor is arranged on the side wall of the settling zone above an inlet of the exhaust pipe and below the overflow weir and is connected with the first regulation and storage tank.
8. The system for treating landfill leachate through the multiple stable anaerobic ammonia oxidation process according to claim 6, wherein an aeration pipe, a first stirring device and a first pH and dissolved oxygen real-time online monitor are arranged in the shortcut nitrification reactor; the aeration pipe is arranged at the bottom of the short-cut nitrification reactor and is matched with an external air compressor.
9. The system for multi-stable anaerobic ammonia oxidation process landfill leachate according to claim 6, wherein the anaerobic ammonia oxidation reactor is provided with a second stirring device and a second real-time online pH and dissolved oxygen monitor.
10. The system for treating landfill leachate according to claim 6, wherein the outlet of the anaerobic ammonia oxidation reactor is connected with the outlet pipe of the anaerobic ammonia oxidation reactor, and the anaerobic ammonia oxidation reactor is respectively connected with a return pipe and an external treatment pipe; the return pipe is connected with the first storage tank; along the backflow direction of the backflow water, a flow monitor and a backflow pump are arranged on the backflow pipe.
CN202211019845.6A 2022-08-24 2022-08-24 System and method for treating garbage leachate through multiple stable anaerobic ammonia oxidation process Pending CN115340186A (en)

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