CN105776775A - Anaerobic-autotrophic nitrogen removal-ozone oxidation coupling landfill leachate whole flow process zero emission processing process - Google Patents

Abstract

The invention provides a landfill leachate treatment process. The landfill leachate passes through a pretreatment system, a main biological treatment system and an advanced treatment system in sequence. The pretreatment system is composed of a regulating pool, an adsorption pool and a coagulation pool. Pretreatment: the effluent enters the main biological treatment system, the main biological treatment system includes anaerobic EGSB reactor, A/O short-range nitrification reaction tank, anaerobic ammonium oxidation UASB reactor, and the above-mentioned treatment devices are regulated in real time through the PLC control system , carry out denitrification and carbon removal reaction; the effluent enters the advanced treatment system for further treatment. Catalyzed ozone oxidation reaction tank, the organic matter, total nitrogen and ammonia nitrogen in the final effluent all meet the emission standards. The invention has the advantages of high-efficiency denitrification and carbon removal, energy saving and consumption reduction, and stable operation, and at the same time realizes the purpose of zero concentrated liquid generation.

Description

Anaerobic-autotrophic denitrification-ozonation coupled landfill leachate full-process zero-discharge treatment process

technical field

The invention relates to the technical field of environmental protection, in particular to a combined process for treating landfill leachate.

Background technique

The landfill leachate produced by urban waste sanitary landfill contains a large amount of organic pollutants, nitrogenous substances and various heavy metal substances. If it is not handled properly, it will become a huge threat to the surrounding environment. Especially the ammonia nitrogen contained in it is the key factor of leachate stabilization treatment; and too high concentration of ammonia nitrogen will inhibit the normal growth of microorganisms and the effect of biochemical treatment. The "Discharge Standard for Landfill Leachate" (GB16889-2008) promulgated by the state has added the standard for total nitrogen discharge, requiring the mass concentration of total nitrogen in the effluent to be less than 40mg/L. So far, it is still a major problem in the treatment of landfill leachate . At present, the treatment of landfill leachate usually adopts the process combination of "pretreatment + biological treatment + advanced treatment". In the landfill leachate treatment market, relatively mature advanced treatment processes are membrane processes such as ultrafiltration and nanofiltration. Although the supernatant after nanofiltration treatment reaches the standard and can be discharged directly, the concentrated liquid produced after nanofiltration separation has a chromaticity Deep, high salinity, COD is mainly humic acid substances that are difficult to degrade, which is difficult to deal with. It is often disposed of by backspraying, refilling landfill or shipping out, which is easy to cause secondary pollution. This part accounts for about 40% of the total treated water. The process consumes a lot of energy, and the operation and investment costs are high. Therefore, the treatment of the concentrate is another major problem in the process of landfill leachate treatment. In general, the traditional process has defects such as complex treatment process, large consumption of chemicals, high cost, total nitrogen discharge of landfill leachate after treatment is not up to standard, and concentrate treatment is not up to standard.

The short-cut nitrification-ANAMMOX series process is currently one of the most economical and concise processes in the field of wastewater biological nitrogen removal. The short-range nitrification technology is to control the biological nitrification process in the ammonia oxidation stage, so that NH ₄ ⁺ -N will no longer be converted into NO ₃ ^- -N after being converted into NO ₂ ^- -N; the anaerobic ammonium oxidation technology is to convert NH ₄ ⁺ Biological reaction technology for direct conversion of -N and NO ₂ ^- -N into nitrogen. The short-cut nitrification-anammox combination process combines the advantages of the two technologies. Compared with the traditional denitrification process, the process has low oxygen consumption, no organic carbon source, less residual sludge, and high denitrification efficiency. Advanced advantages.

In addition, the strong oxidation of ozone can degrade the refractory organic matter in the landfill leachate into easily biodegradable organic matter, improving its biodegradability, and then through the secondary biological treatment of the MBR process and deep oxidation of ozone, the organic matter in the effluent can reach the standard emission. At the same time achieve the purpose of decolorization and deodorization. The strong ozone oxidation advanced treatment technology can achieve the goal of "zero concentrate" of landfill leachate, and completely solve the problems of difficult and high disposal cost of concentrate in traditional processes.

Therefore, how to apply the above two technologies to the treatment of landfill leachate has become one of the research hotspots.

Contents of the invention

The purpose of the present invention is to provide a combination process for landfill leachate treatment, through the organic combination of anaerobic technology, autotrophic denitrification technology, and ozone advanced oxidation technology, learn from each other's strengths, thereby having high ammonia nitrogen removal rate, high chroma removal rate, It has the advantages of high COD removal rate, stable operation, strong adaptability to water quality changes, low cost, and zero concentrate generation.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A combined process for landfill leachate treatment, comprising the steps of:

(1) Garbage leachate is pretreated through adsorption tanks and coagulation tanks;

(2) After the effluent of the coagulation tank is mixed with the reflux liquid of the anammox reactor, synchronous denitrification and methanation reaction are carried out in the anaerobic EGSB reactor;

(3) 55%-60% of the effluent from anaerobic treatment enters the A/O short-range nitrification reaction tank, and the rest enters the sump II;

(4) After the A/O short-range nitrification effluent is mixed with the anaerobic liquid in the sump II at a volume ratio of 1:1, the denitrification reaction is carried out in the UASB anaerobic ammonium oxidation reactor;

(5) The effluent from the anaerobic ammonium oxidation reactor enters the zero concentrate advanced treatment system, and then undergoes two-stage coagulation treatment, one-stage homogeneous catalytic ozone oxidation treatment, MBR secondary biological treatment, and two-stage homogeneous catalytic ozone oxidation treatment After that, meet the emission standards.

According to the above scheme, the PLC control system performs real-time control on the anaerobic treatment, short-cut nitrification treatment and anammox treatment:

The first liquid flow sensor is installed on the backflow pipeline before the anaerobic EGSB reactor, the first temperature sensor, the liquid flow meter, and the first pH electrode are arranged in the middle of the reactor, and the water inlet of the A/O short-range nitrification reaction tank is provided with The second liquid flow sensor is provided with a second temperature sensor, a DO electrode, a second pH electrode, and a first ammonia nitrogen electrode in the aerobic zone of the A/O short-range nitrification tank, and a gas flow sensor is provided on the aeration pipeline; A third liquid flow sensor is provided on the water inlet pipe connected to the sump II before the anaerobic ammonium oxidation reactor, and a third temperature sensor, a third pH electrode, an ORP electrode, the second NH ₄ ⁺ -N electrode, NO ₂ ^- -N electrode; the above-mentioned online monitors are respectively connected to the PLC control system;

The PLC control system displays the collected signals on the man-machine interface, calculates the real-time control variables according to the operating program, and performs real-time regulation on the pumps, heating devices, aerators, and electric valves connected to the PLC control system.

According to the above plan, the biogas generated by the anaerobic treatment is transported to the biogas storage tank, and after purification, it is burned to heat the short-range nitrification treatment and anaerobic ammonia oxidation treatment unit, and the remaining heat is used for power generation to provide the use of the whole plant electricity to achieve energy self-sufficiency.

According to the above scheme, the advanced treatment is a combined process of MBR secondary biological treatment and ozone oxidation treatment, including secondary coagulation treatment, primary homogeneous catalytic ozone oxidation treatment, MBR secondary biological treatment, secondary homogeneous catalytic ozone Oxidation treatment, truly realize zero concentrate treatment process.

According to the above solution, the catalyst used in the first homogeneous catalytic ozonation treatment is a liquid catalyst containing transition metal ions such as Mn ²⁺ , Ag ⁺ , and the like.

According to the above scheme, the ozone tail gas generated in the advanced treatment is collected and then discharged into the ozone tail gas decomposition device for treatment.

Each technological principle of the present invention is as follows:

a. Adsorption coagulation:

The landfill leachate first enters the regulating tank to adjust the water quality and balance the water volume, and then enters the adsorption tank. A certain amount of adsorbent is added to the adsorption tank. After the reaction is complete, the effluent enters the coagulation tank. Next, the coagulation reaction is carried out, and the sediment in the adsorption tank and the coagulation tank is sent to the sludge thickening tank through pumps and pipelines.

b. Anaerobic treatment (simultaneous denitrification and methanation treatment):

The landfill leachate after adsorption coagulation treatment is mixed with the reflux liquid of the anaerobic ammonium oxidation reaction tank, and then enters the anaerobic reaction tank, the pH is controlled at 7-8, the temperature is 30-35 ° C, and the mixed solution is in contact with the bottom sludge Finally, denitrification is carried out first. Volatile fatty acids such as acetic acid can be used as organic carbon sources for denitrification to remove nitrate nitrogen in the anammox reflux liquid, which improves the total nitrogen removal rate of the system and produces a large amount of alkalinity; Then, under the action of acid-producing bacteria in the expanded granular sludge, the macromolecular organic matter in the leachate is hydrolyzed and acidified into small molecular organic matter, and then decomposed into methane through the combined action of anaerobic and facultative bacteria adsorption, fermentation, and methanogenic Or carbon dioxide; the liquid carrying biogas rises to the top and passes through the three-phase separator, the sludge falls back to the reaction area, the biogas is transported to the biogas storage tank, part of the water is internally refluxed, and part of it flows out as effluent.

c. Short-range nitrification:

Part of the leachate after simultaneous denitrification and methane production enters the anoxic zone of the A/O short-range nitrification reaction tank, further removes organic matter, and then flows into the aerobic zone. The pH in the aerobic zone is controlled at 7.5-8.0 and the temperature is 25-30 ℃, then start the aeration and stirring system, maintain the DO in the reaction process at about 2.0mg/L, stop the nitrification process at the nitrite stage, and monitor the ammonia nitrogen concentration in the reaction tank in real time according to the online ammonia nitrogen electrode, and through the PLC system in time Adjust the ammonia nitrogen load in the influent so that the average FA (free ammonia) in the reaction tank is lower than 10mg/L. Through FA inhibition and real-time control, the short-term nitrification can achieve a nitrite nitrogen accumulation rate of more than 95%.

d. Anammox:

The leachate after short-cut nitrification treatment enters the anaerobic ammonium oxidation UASB reactor, and after mixing with the anaerobic treatment solution in the sump II in a certain proportion, the online NO ₂ ^- -N electrode installed at the water inlet, NH ₄ ⁺ The -N electrode is used for real-time monitoring, so that the influent NO ₂ ^- -N/NH ₄ ⁺ -N=1.32, the operating temperature is controlled at 35°C, and the rising flow rate is 1-2m/h. The reaction can be carried out under low temperature, so that the removal rate of NO ₂ ^- -N and NH ₄ ⁺ -N can reach more than 90%, and the mud and water are separated by the three-phase separator at the top of the reactor.

e. Advanced processing:

The effluent from the anaerobic ammonium oxidation reaction tank enters the zero concentrate advanced treatment system, including the secondary coagulation tank, the first homogeneous catalytic ozone oxidation reaction tank, the MBR membrane reaction tank, and the second ozone oxidation reaction tank. The effluent from the anammox reactor enters the flocculation sedimentation tank, and under the action of coagulants and flocculants, part of the macromolecular refractory organic matter and metal ions are removed in the form of precipitates. After precipitation, the supernatant enters the first-stage homogenizer Phase-catalyzed ozone oxidation reaction tank, under the action of a liquid catalyst, utilizes the strong oxidizing properties of ozone to degrade the refractory organic matter in landfill leachate into easily biodegradable organic matter, improving its biodegradability; the effluent enters the MBR membrane reaction pool , design a submerged MBR membrane treatment device in the MBR reaction tank to carry out nitrification and denitrification reactions, and further remove organic matter, ammonia nitrogen and other pollutants. The built-in or external membrane modules can efficiently separate solids and liquids and reduce the pollution of effluent water Substance concentration; the effluent enters the secondary homogeneous catalytic ozonation reaction tank to degrade a small amount of refractory organic matter remaining in the wastewater, and at the same time has the functions of decolorization and deodorization, so that the effluent can reach the standard stably.

The beneficial effects of the present invention are:

1) The main biological process of the present invention adopts the treatment process of "anaerobic EGSB reactor + A/O short-range nitrification reaction tank + UASB anaerobic ammonium oxidation reactor", which is fully combined with anaerobic EGSB to efficiently remove COD and accumulated nitrous acid in A/O pool The advantages of salt and anaerobic ammonium oxidation to remove total nitrogen make the present invention have the advantages of no need for additional carbon source, low aeration energy consumption, high nitrogen removal efficiency, stable system operation, and less excess sludge output;

2) The advanced treatment process of the present invention adopts the process of "flocculation sedimentation tank + first-level homogeneous catalytic ozone oxidation reaction tank + MBR reaction tank + second-level homogeneous catalytic ozone oxidation reaction tank" to completely realize zero concentrated liquid discharge and solve the problem of traditional Nanofiltration, reverse osmosis and other membrane treatment cannot avoid the problem of difficult disposal of concentrated liquid;

3) The biogas produced by the anaerobic treatment system of the present invention is transported to the biogas storage tank, purified, and burned to heat the short-range nitrification treatment and anammox treatment unit, and the remaining heat is used for power generation to provide the use of the whole plant electricity to achieve energy self-sufficiency;

4) The present invention adopts a PLC control system, which can realize real-time control of the operating conditions of the main biological process and ensure the stable operation of the treatment process;

5) In the first and second catalytic ozonation reaction tanks of the present invention, liquid catalysts (Mn ²⁺ , Ag ⁺ ) are added to promote the decomposition reaction of ozone in water, generate more active free radicals, and greatly increase the penetration rate. The removal rate of COD in the filtrate is greatly reduced, and the amount of ozone consumed is greatly reduced;

6) The ozone tail gas produced by the advanced ozone treatment of the present invention is collected and discharged into an ozone tail gas decomposition device for treatment, thereby avoiding harm to the environment.

Description of drawings

Fig. 1 is a schematic diagram of a process flow of the present invention;

Fig. 2 is the schematic block diagram of the PLC control system of main body biochemical treatment process of the present invention;

Fig. 3 is the PLC online control flowchart of the anaerobic reaction of main body biochemical treatment process of the present invention;

Fig. 4 is the PLC online control flowchart of the short-range nitrification reaction of main body biochemical treatment process of the present invention;

Fig. 5 is a PLC online control flow chart of the anaerobic ammonium oxidation reaction of the main biochemical treatment process of the present invention.

In the figure: 1. Regulating tank; 2. Adsorption tank; 3. Coagulation tank; 4. Water collection tank I; 5. Anaerobic EGSB reactor; 6. A/O short-range nitrification reaction tank; 7. Water collection tank II; 8 , UASB anaerobic ammonium oxidation reactor; 9, coagulation sedimentation tank; 10, the first homogeneous catalytic ozone oxidation reaction tank; 11, MBR membrane reaction tank; 12, the second ozone oxidation reaction tank; F1, biogas storage tank; F2, sludge thickening tank; F3, centrifugal dehydrator; F4, ozone tail gas decomposition device.

detailed description

The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

The present invention provides a combined process for landfill leachate treatment (see Figures 1 to 5), comprising the following specific steps:

1) Adsorption coagulation pretreatment:

The landfill leachate first enters the adjustment tank 1 to adjust the water quality and balance the water volume, and then enters the adsorption tank 2. Add a certain amount of adsorbent (fly ash and other cheap adsorbents) into the adsorption tank, turn on the stirring equipment, and adjust it to a reasonable speed. Carry out adsorption treatment, after the reaction is complete, stop stirring, leave standstill, the effluent of the adsorption tank enters in the coagulation tank 3, and in the coagulation tank 3, add a certain amount of coagulant (high polymerization coagulant such as polyferric sulfate) ) and coagulant PAM, adjust the pH to 7.5-8.5 (pH regulator adopts lime) and adjust the stirring equipment to a reasonable speed, carry out coagulation treatment, after stirring for a certain period of time, stop, open the coagulation tank 3 effluent, the sediment in the adsorption tank 2 and the coagulation tank 3 is sent to the sludge thickening tank through pumps and pipelines, and most of the suspended organic matter and suspended matter can be removed through adsorption coagulation pretreatment, reducing the concentration of heavy metals and improving Biodegradability;

2) Anaerobic treatment (simultaneous denitrification methane treatment):

The landfill leachate after adsorption coagulation treatment is mixed with the reflux liquid of UASB anaerobic ammonium oxidation reactor 8 in sump I4, and then enters the water distribution area of anaerobic EGSB reactor 5, and the lye tank passes through the The lye pipe is connected to the water inlet, and the alkalinity is replenished in time through the PLC system control, and the pH inside the reactor is controlled at 7-8. There is a water bath interlayer outside the reactor, the temperature is maintained at 30-35°C, and the rising flow rate is 1-6m /h, after the mixed solution is in contact with the bottom sludge, denitrification is carried out first, and volatile fatty acids such as acetic acid can be used as organic carbon sources for denitrification to remove nitrate nitrogen in the anammox reflux liquid and increase the total nitrogen of the system At the same time, a large amount of alkalinity is generated; then, under the action of acid-producing bacteria in the expanded granular sludge, the macromolecular organic matter in the leachate is hydrolyzed and acidified into small molecular organic matter, followed by the adsorption of anaerobic and facultative bacteria, fermentation, The joint action of methane production decomposes it into methane or carbon dioxide; the liquid carrying biogas rises to the top and passes through the three-phase separator, the sludge falls back to the reaction area, and the biogas is transported to the biogas storage tank F1, and the water part enters the anaerobic EGSB side The internal return outlet on the wall is used for internal return through the internal return pipe with the internal return pump, and the other part flows out as effluent, and 40-45% of the effluent enters the sump II6;

3) Short-range nitrification treatment:

55-60% of the leachate after synchronous denitrification and methane production enters the anoxic zone of the A/O short-range nitrification reaction pool 6, further removes organic matter and then enters the aerobic zone. The pH in the aerobic zone is controlled at 7.5-8.0, the temperature 25-30 ℃, then turn on the stirring equipment, start the aeration system consisting of aeration head, blower, gas flow sensor and air control valve, maintain the DO in the reaction process at about 2mg/L, according to the real-time monitoring of the online ammonia nitrogen electrode The concentration of ammonia nitrogen in the reaction tank, and the load of ammonia nitrogen in the influent is regulated through the PLC system, so that the average FA in the reaction tank is lower than 10mg/L. Through FA inhibition and real-time control, the short-term nitrification can achieve a nitrite nitrogen accumulation rate of more than 95%. Water is pumped into the UASB anaerobic ammonium oxidation reactor 8;

4) Anammox treatment:

The leachate after the short-cut nitrification treatment enters the UASB anaerobic ammonium oxidation reactor 8, and is mixed with the anaerobic treatment liquid in the sump II7 at a volume ratio of 1:1, and the online NO ₂ ^- -N electrodes, NH ₄ ⁺ -N electrodes for real-time monitoring, so that the influent NO ₂ ^- -N/NH ₄ ⁺ -N=1.32, when NO ₂ ^- -N/NH ₄ ⁺ -N>1.32, pass The PLC system controls to appropriately increase the flow from the sump II7 into the UASB anaerobic ammonium oxidation reactor 8, on the contrary, when NO ₂ ^- -N/NH ₄ ⁺ -N<1.32, appropriately reduce the For the flow rate entering the anammox reactor in pool II7, the operating temperature is controlled at 35°C, the ascending flow rate is 1-2m/h, and the ORP range is -200mV-50mV. The reaction is carried out under the action of anammox bacteria, which can Make the removal rate of NO ₂ ^- -N and NH ₄ ⁺ -N more than 90%, and separate the mud and water through the three-phase separator at the top of the reactor;

5) Deep processing:

The effluent from the anaerobic ammonium oxidation reactor enters the zero concentrate advanced treatment system, including the coagulation sedimentation tank 9, the first-stage homogeneous catalytic ozonation reaction tank 10, the MBR membrane reaction tank 11, and the second-level homogeneous catalytic ozonation reaction tank 12 , the effluent of the UASB anaerobic ammonium oxidation reactor 8 enters the coagulation sedimentation tank 9, in the coagulant (polyaluminum chloride, 50-1000mg/L) and flocculant (PAM, 5-20mg/L) Under the action of the filter, part of the macromolecular refractory organic matter and metal ions are removed in the form of precipitates, which reduces the COD concentration in the leachate and removes the toxicity. Precipitation is carried out in the form of inclined plate precipitation, and the supernatant enters the one The level homogeneous catalytic ozonation reaction tank 10, under the action of a liquid catalyst (generally metal transition ions, Mn ²⁺ , Ag ⁺ , etc.), utilizes the strong oxidizing property of ozone to degrade the refractory organic matter in landfill leachate into Easily biodegradable organic matter, improve its biodegradability; Outlet water enters described MBR membrane reaction tank 11, adopts submerged MBR membrane treatment device in described MBR membrane reaction tank 11, carries out nitrification and denitrification reaction, further removes COD, BOD, ammonia nitrogen, etc., its built-in or external membrane module can efficiently separate solid-liquid; the effluent enters the secondary homogeneous catalytic ozonation reaction tank 12 to degrade a small amount of refractory COD remaining in the wastewater, and has the functions of decolorization, Deodorization and other functions, so that the effluent can stably meet the discharge standards of the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008).

Further, a first liquid flow sensor is installed on the return pipe before the anaerobic EGSB reactor 5, and the middle part of the reactor is provided with a first temperature sensor, a liquid flow meter, a first pH electrode, and an A/O short-range nitrification reaction pool A second liquid flow sensor is provided before the water inlet, and a second temperature sensor, a DO electrode, a second pH electrode, a first ammonia nitrogen electrode, and an aeration pipeline are arranged in the 6 aerobic zones of the A/O short-range nitrification reaction tank. A gas flow sensor is provided on the top; a third liquid flow sensor is provided on the water inlet pipe connecting the sump II before the UASB anaerobic ammonium oxidation reactor 8, and a third liquid flow sensor is provided in the UASB anaerobic ammonium oxidation reactor 8 The third temperature sensor, the third pH electrode, the ORP electrode, the second NH ₄ ⁺ -N electrode, and the NO ₂ ^- -N electrode; the above devices transmit the detected signals to the PLC control system and display them on the man-machine interface, Real-time control variables are calculated according to the operating program, and components such as electric valves and pumps are regulated to ensure the smooth operation of the process. Schematic block diagram of the PLC control system of the main biochemical treatment process, the PLC online control flow chart of the anaerobic reaction of the main biochemical treatment process, the PLC online control flow chart of the short-range nitrification reaction of the main biochemical treatment process, and the anaerobic ammonia reaction of the main biochemical treatment process The PLC online control flow charts of the oxidation reaction are shown in Fig. 2 to Fig. 5 respectively.

Through the above steps, the present invention may produce secondary pollution during the implementation process, including the biogas produced by the anaerobic treatment process, the remaining sludge generated by the system, and the residual ozone from advanced treatment; as mentioned above, the biogas produced by anaerobic transported to the biogas storage tank F1, purified, and burned to heat the short-range nitrification and anaerobic ammonium oxidation treatment units, and the remaining heat can be used for power generation, which can provide the electricity used by the whole plant and realize energy self-sufficiency; The remaining sludge produced by the pool I4, the anaerobic EGSB reactor 5 and the advanced treatment system is pumped into the sludge thickening tank F2, and after being solidified by the centrifugal dehydrator F3, the filtrate is returned to the adsorption tank 2, and the solidified sludge is transported and filled. Buried treatment or incineration treatment; the residual ozone gas after the advanced treatment is collected and enters the ozone tail gas decomposition device F4, and is discharged after catalytic decomposition.

The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the above embodiments have described the present invention in detail, those skilled in the art should understand that the present invention can be modified or replaced without departing from the present invention. Any modifications and partial substitutions in the spirit and scope shall fall within the scope of the claims of the present invention.

Claims (6)

1. a combination process for landfill leachate treatment, is characterized in that, comprises the steps: (1) Garbage leachate is pretreated through adsorption tanks and coagulation tanks; (2) After the effluent of the coagulation tank is mixed with the reflux liquid of the anammox reactor, synchronous denitrification and methanation reaction are carried out in the anaerobic EGSB reactor; (3) 55%-60% of the effluent from anaerobic treatment enters the A/O short-range nitrification reaction tank, and the rest enters the sump II; (4) After the A/O short-range nitrification effluent is mixed with the anaerobic liquid in the sump II at a volume ratio of 1:1, the denitrification reaction is carried out in the UASB anaerobic ammonium oxidation reactor; (5) The effluent from the anaerobic ammonium oxidation reactor enters the zero concentrate advanced treatment system, and then undergoes two-stage coagulation treatment, one-stage homogeneous catalytic ozone oxidation treatment, MBR secondary biological treatment, and two-stage homogeneous catalytic ozone oxidation treatment After that, meet the emission standards. 2. the combined process of landfill leachate treatment according to claim 1, is characterized in that, described PLC control system carries out real-time control to described anaerobic treatment, short-range nitrification treatment, anammox treatment: The first liquid flow sensor is installed on the backflow pipeline before the anaerobic EGSB reactor, the first temperature sensor, the liquid flow meter, and the first pH electrode are arranged in the middle of the reactor, and the water inlet of the A/O short-range nitrification reaction tank is provided with The second liquid flow sensor is provided with a second temperature sensor, a DO electrode, a second pH electrode, and a first ammonia nitrogen electrode in the aerobic zone of the A/O short-range nitrification tank, and a gas flow sensor is provided on the aeration pipeline; A third liquid flow sensor is provided on the water inlet pipe connected to the sump II before the anaerobic ammonium oxidation reactor, and a third temperature sensor, a third pH electrode, ORP electrode, second NH ₄ ⁺ -N electrode, NO ₂ ^- -N electrode; the above-mentioned on-line monitors are respectively connected to the PLC control system; The PLC control system displays the collected signals on the man-machine interface, calculates the real-time control variables according to the operating program, and performs real-time regulation on the pumps, heating devices, aerators, and electric valves connected to the PLC control system. 3. The combined process of landfill leachate treatment according to claim 1, characterized in that the biogas produced by the anaerobic treatment is transported to a biogas storage tank, and after purification, it is burned for heating the short-range nitrification treatment, anaerobic Oxygen ammonium oxidation treatment unit, the remaining heat is used for power generation. 4. The combined process of landfill leachate treatment according to claim 1, characterized in that, the advanced treatment is a combined process of MBR secondary biological treatment and ozone oxidation treatment, including flocculation and sedimentation treatment, one-stage homogeneous catalytic ozone Oxidation treatment, MBR secondary biological treatment, two-stage homogeneous catalytic ozone oxidation treatment, truly realize the advanced treatment process of zero concentrate. 5. The combined process of landfill leachate treatment according to claim 1, characterized in that the catalyst used in the first and second homogeneous catalytic ozonation treatments is a liquid catalyst, which contains Mn ²⁺ , Ag ⁺ and other transition metal ions. 6. The combined process of landfill leachate treatment according to claim 1, characterized in that the ozone tail gas generated in the advanced treatment is collected and then discharged into an ozone tail gas decomposition device for treatment.