Leachate treatment system for waste ecological landfill

Abstract

The leachate treatment system for an ecological landfill includes a landfill area, emergency municipal solid waste leachate treatment equipment, fly ash leachate treatment equipment, and a shared reverse osmosis unit. The landfill area includes an emergency municipal solid waste storage area and a fly ash storage area. Several dividing dams are interspersed within the emergency municipal solid waste storage area, forming several reusable storage areas. Through the redesign of a traditional fly ash landfill, an emergency disposal solution is provided for excess municipal solid waste generated due to sudden equipment failure and reduced incineration capacity. This allows the landfill to flexibly convert the reserved emergency municipal solid waste landfill area into a fly ash landfill area after emergency disposal of municipal solid waste and filling of the fly ash storage area to the designated elevation. A complete treatment system for municipal solid waste leachate and fly ash leachate is designed, utilizing shared equipment to reduce system costs and improving the overall treatment process accordingly.

Description

Technical Field

[0001] This invention relates to the field of landfill leachate treatment technology, specifically to a leachate treatment system for eco-friendly landfills. Background Technology

[0002] Fly ash from the incineration of municipal solid waste, sludge, and hazardous waste can be disposed of in landfills after undergoing various technical treatments and solidification. The heavy metals, dioxins, and other harmful substances contained in the fly ash can be fixed in a relatively stable form after appropriate stabilization and solidification treatment, reducing potential threats to the environment and human health.

[0003] Landfill leachate (also known as landfill effluent or leachate water) is a high-concentration wastewater generated during the landfill process. It is mainly produced by environmental precipitation, the water content of the waste itself, and waste degradation. Effective treatment of landfill leachate ensures that the effluent quality meets the current national emission standards and minimizes the negative impact of leachate on the surrounding environment.

[0004] The problem with the existing technology is that, taking the applicant's plant operation experience as an example, under normal circumstances and with the normal maintenance schedule of the incineration equipment, the municipal solid waste can be completely incinerated.

[0005] However, in the event of a sudden malfunction in the incineration equipment, the incineration capacity is reduced, and during periods when the incineration volume is reduced or suspended, the raw municipal solid waste accumulates beyond the incineration plant's inventory.

[0006] The excess waste during this period requires a temporary emergency disposal facility to be used after the incineration plant resumes operation. Two points need to be considered: first, it cannot be directly transferred to sanitary landfill; second, the leachate problem generated during the emergency disposal of municipal solid waste needs to be addressed.

[0007] Setting up additional temporary emergency disposal sites for municipal solid waste not only occupies land, but also presents challenges because the treatment process for leachate from municipal solid waste dumps differs from that for fly ash leachate. For example, fly ash leachate is typically high-salt, low-COD, requiring the removal of various heavy metals such as hexavalent chromium and total chromium. Municipal solid waste leachate, however, necessitates an additional set of equipment, incurring significant costs.

[0008] Therefore, if the fly ash landfill can be redesigned and modified, under normal circumstances and with the regular maintenance schedule of the incineration equipment, the main function will be to landfill and solidify the fly ash. At the same time, in case of emergency, the corresponding municipal solid waste will need to be landfilled in the fly ash landfill. The two sets of leachate treatment equipment can be integrated and the equipment can be shared, which will make more efficient use of land and reduce equipment costs. Summary of the Invention

[0009] To address the shortcomings of the aforementioned technologies, this invention provides a leachate treatment system for ecological landfills.

[0010] The technical solution of the present invention: a leachate treatment system for an ecological landfill, comprising a landfill area, emergency domestic waste leachate treatment equipment, fly ash leachate treatment equipment, and a shared reverse osmosis device. The landfill area includes an emergency domestic waste storage area and a fly ash storage area. Several dividing dams are set at intervals within the emergency domestic waste storage area to form several repurpose storage areas.

[0011] The emergency domestic waste leachate treatment equipment includes a domestic waste equalization tank, a water quality equalization tank, a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank, a UF ultrafiltration device, an NF nanofiltration device, a coagulation sedimentation device, a first high-efficiency jet ozone reactor, a second high-efficiency jet ozone reactor, and a sludge dewatering device.

[0012] The domestic waste equalization tank is connected to the pipelines of each transfer storage area, and the pipeline opening and closing are controlled separately. The domestic waste equalization tank collects leachate from domestic waste and pumps it to the water quality equalization tank. Then it flows through the primary denitrification tank, the primary nitrification tank, the secondary denitrification tank, and the secondary nitrification tank in sequence, and performs aeration, carbon source addition, denitrification reflux, and heat exchange and temperature regulation between each nitrification tank and the denitrification tank.

[0013] The effluent from the secondary nitrification tank enters the UF ultrafiltration unit, the ultrafiltration concentrate produced by the UF ultrafiltration unit is fed into the primary denitrification tank, the excess sludge produced is introduced into the sludge dewatering unit, and the clear liquid produced enters the NF nanofiltration unit.

[0014] The concentrated liquid produced by the NF nanofiltration device is introduced into the coagulation sedimentation device, the sludge produced by the coagulation sedimentation device is introduced into the sludge dewatering system, and the clear liquid produced is treated by the second high-efficiency jet ozone reactor and then returned to the tank.

[0015] The clarified liquid produced by the NF nanofiltration device is tested and then either introduced into the first high-efficiency jet ozone reactor for treatment to meet emission standards, or introduced into a shared reverse osmosis device.

[0016] The fly ash leachate treatment equipment includes a combined equalization tank, a reduction reaction tank, a neutralization reaction tank, a flocculation tank, an inclined tube sedimentation tank, a sand filter, a carbon filter, a reclaimed water tank, a temporary storage tank, a reclaimed neutralization tank, an activated carbon filter, and an effluent pipeline.

[0017] The combined equalization tank is connected to the fly ash storage area and each transfer storage area via pipelines, and the pipelines are controlled to open and close separately. After the fly ash leachate is collected and homogenized in the combined equalization tank, it is pumped to the reduction reaction tank for acidification and reduction reaction, and then introduced into the neutralization reaction tank for oxidation reaction and acid-base neutralization reaction. After that, it is introduced into the flocculation tank to add flocculants and coagulants. After flocculation, it is introduced into the inclined tube sedimentation tank to separate the heavy metal sludge and wastewater, and complete the sedimentation. The heavy metal sludge is introduced into the sludge tank for concentration and off-site treatment.

[0018] The clarified liquid from the inclined tube sedimentation tank is introduced into a sand filter and a carbon filter for deep treatment, and then enters a recycled water tank. The temporary storage tank is connected to the recycled water tank, the shared reverse osmosis unit, and the recycled neutralization tank.

[0019] The shared reverse osmosis unit selectively connects to the clarified liquid produced by the NF nanofiltration unit or to the temporary storage tank according to the processing volume and processing time period.

[0020] The water in the temporary storage tank is filtered and pressurized through a multi-stage reverse osmosis unit and then pumped to a reuse neutralization tank for pH adjustment. The water effluent from the reuse neutralization tank is diverted to the effluent pipeline after clarity detection, or it passes through an activated carbon filter before entering the effluent pipeline.

[0021] The outlet pipeline is equipped with a pH detection device, a first return pipe, a standard discharge outlet, a heavy metal detection device, a second return pipe, an ammonia nitrogen detection device, a third return pipe, a booster pump, and several electric valves. The first return pipe connects the outlet pipeline and the temporary storage tank and is controlled by the pH detection device. The second return pipe connects the standard discharge outlet and the combined regulating tank and is controlled by the heavy metal detection device. The third return pipe connects the standard discharge outlet and the recycled water tank and is controlled by the ammonia nitrogen detection device.

[0022] Using the above technical solution, municipal solid waste leachate is pumped into a homogenization tank, then pumped again into a biological treatment tank group, where it sequentially undergoes primary denitrification, primary nitrification, secondary denitrification, and secondary nitrification. Subsequently, it undergoes sludge-water separation via an ultrafiltration system. The ultrafiltration clarified liquid enters a nanofiltration system for further treatment. The nanofiltration permeate is treated in an ozone reactor and discharged after meeting emission standards; the nanofiltration concentrate, after coagulation and sedimentation, enters the ozone reactor and is reinjected into the storage area. The sludge treatment system uses centrifuges to dewater the biological sludge, which is then landfilled; odors are discharged after passing through an odor removal system to meet emission standards.

[0023] After collection, the leachate from the fly ash storage area enters the leachate equalization tank, where homogenization is completed. The effluent from the equalization tank directly enters the reduction tank for acidification and reduction reactions to remove oxidizing toxic substances, including hexavalent chromium, while also removing color. The effluent from the reduction tank enters the oxidation neutralization tank for oxidation and acid-base neutralization reactions, primarily involving the addition of NaOH and other reagents to induce the precipitation of heavy metals from the wastewater. The effluent then enters the flocculation tank where flocculants and coagulants are added to destabilize and flocculate the precipitated heavy metal pollutant particles. In the inclined tube sedimentation tank, heavy metal sludge and wastewater are separated, completing the sedimentation process. The effluent from the sedimentation tank enters the intermediate water tank to provide water flow regulation for subsequent filtration equipment. The effluent from the intermediate water tank enters a sand filter and carbon filter for advanced treatment. To ensure compliance with GB16889-2008 Table 2 standards, a shared reverse osmosis unit is installed as a safety device (shared with the emergency municipal solid waste leachate treatment system) to guarantee effective removal of heavy metals. Sludge from the inclined tube sedimentation tank is pumped into a sludge storage tank. Reverse osmosis concentrate enters the fly ash leachate equalization tank. Heavy metal sludge is directly transported off-site, while the supernatant is returned to the equalization tank. Bypass pipelines are installed in all stages, including the reduction tank, oxidation-neutralization tank, flocculation tank, sand filter, carbon filter, and reverse osmosis unit. Because the heavy metal content of the sludge in the fly ash leachate exceeds design requirements, deep sedimentation and secondary stratification are performed in addition to the primary inclined tube sedimentation tank, resulting in supernatant overflowing to the sand and carbon filters. A breakpoint chlorination deep oxidation tank is added to the existing process to reduce ammonia nitrogen and total nitrogen levels, which could not be removed in the previous stages, to within the limits. The effluent is treated in a pH adjustment tank for recycled water to achieve pH stability before being discharged in compliance with regulations.

[0024] A further feature of the present invention is that the fly ash leachate treatment equipment is provided in parallel with two sets of inclined tube sedimentation tanks, a sand filter, a carbon filter, and a recycled water tank. The flocculation tank is connected to the two sets of inclined tube sedimentation tanks by a branch pipe and is equipped with a manual valve for controlling the on / off state. The two sets of recycled water tanks are respectively connected to a temporary storage tank.

[0025] The above technical solution involves the parallel connection of two sets of equipment, which are activated based on the increase in leachate volume in the fly ash storage area.

[0026] A further feature of the present invention is that the temporary storage tank is connected to a shared reverse osmosis device or an NF nanofiltration concentration tank.

[0027] A further feature of the present invention is that the combined regulating tank is connected to the fly ash storage area and each transfer storage area by a municipal solid waste regulating tank.

[0028] A further feature of the invention is that the system also includes an evaporation / distillation device.

[0029] The above-mentioned technical solution utilizes evaporation / distillation, a technique that uses high temperature to remove volatile components (recalcitrant organic matter) from the leachate membrane treatment concentrate with steam, thereby reducing the volume of the original liquid. The installation of evaporation / distillation equipment significantly improves compliance with four indicators (ammonia nitrogen, total nitrogen, COD, and hexavalent chromium). The beneficial effects of this invention are: through the redesign of traditional fly ash landfills, an emergency disposal solution is provided for excess municipal solid waste generated due to reduced incineration capacity in the event of a sudden equipment failure. This allows the landfill to flexibly convert reserved emergency municipal solid waste landfill areas into fly ash landfill areas after emergency disposal of municipal solid waste and fly ash storage to the designated elevation. A complete treatment system for municipal solid waste leachate and fly ash leachate is designed, utilizing shared equipment to reduce system costs and improving the overall treatment process accordingly. Attached Figure Description

[0030] Figure 1 The process flow of this invention is as follows: Figure 1 .

[0031] Figure 2 The process flow of this invention is as follows: Figure 2 .

[0032] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual size of the product. Furthermore, the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Detailed Implementation

[0033] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0034] like Figure 1-2 As shown, the leachate treatment system of the landfill includes a landfill area, emergency domestic waste leachate treatment equipment, fly ash leachate treatment equipment, and a shared reverse osmosis unit. The landfill area includes an emergency domestic waste storage area and a fly ash storage area. Several dividing dams are set at intervals in the emergency domestic waste storage area to form several repurpose storage areas.

[0035] The emergency domestic waste leachate treatment equipment includes a domestic waste equalization tank, a water quality equalization tank, a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank, a UF ultrafiltration device, an NF nanofiltration device, a coagulation sedimentation device, a first high-efficiency jet ozone reactor, a second high-efficiency jet ozone reactor, and a sludge dewatering device.

[0036] The domestic waste equalization tank is connected to the pipelines of each transfer storage area, and the pipeline opening and closing are controlled separately. The domestic waste equalization tank collects leachate from domestic waste and pumps it to the water quality equalization tank. Then it flows through the primary denitrification tank, the primary nitrification tank, the secondary denitrification tank, and the secondary nitrification tank in sequence, and performs aeration, carbon source addition, denitrification reflux, and heat exchange and temperature regulation between each nitrification tank and the denitrification tank.

[0037] The effluent from the secondary nitrification tank enters the UF ultrafiltration unit, the ultrafiltration concentrate produced by the UF ultrafiltration unit is fed into the primary denitrification tank, the excess sludge produced is introduced into the sludge dewatering unit, and the clear liquid produced enters the NF nanofiltration unit.

[0038] The concentrated liquid produced by the NF nanofiltration device is introduced into the coagulation sedimentation device, the sludge produced by the coagulation sedimentation device is introduced into the sludge dewatering system, and the clear liquid produced is treated by the second high-efficiency jet ozone reactor and then returned to the tank.

[0039] The clarified liquid produced by the NF nanofiltration device is tested and then either introduced into the first high-efficiency jet ozone reactor for treatment to meet emission standards, or introduced into a shared reverse osmosis device.

[0040] The fly ash leachate treatment equipment includes a combined equalization tank, a reduction reaction tank, a neutralization reaction tank, a flocculation tank, an inclined tube sedimentation tank, a sand filter, a carbon filter, a reclaimed water tank, a temporary storage tank, a reclaimed neutralization tank, an activated carbon filter, and an effluent pipeline.

[0041] The combined equalization tank is connected to the fly ash storage area and each transfer storage area via pipelines, and the pipelines are controlled to open and close separately. After the fly ash leachate is collected and homogenized in the combined equalization tank, it is pumped to the reduction reaction tank for acidification and reduction reaction, and then introduced into the neutralization reaction tank for oxidation reaction and acid-base neutralization reaction. After that, it is introduced into the flocculation tank to add flocculants and coagulants. After flocculation, it is introduced into the inclined tube sedimentation tank to separate the heavy metal sludge and wastewater, and complete the sedimentation. The heavy metal sludge is introduced into the sludge tank for concentration and off-site treatment.

[0042] The clarified liquid from the inclined tube sedimentation tank is introduced into a sand filter and a carbon filter for deep treatment, and then enters a recycled water tank. The temporary storage tank is connected to the recycled water tank, the shared reverse osmosis unit, and the recycled neutralization tank.

[0043] The shared reverse osmosis unit selectively connects to the clarified liquid produced by the NF nanofiltration unit or to the temporary storage tank according to the processing volume and processing time period.

[0044] The water in the temporary storage tank is filtered and pressurized through a multi-stage reverse osmosis unit and then pumped to a reuse neutralization tank for pH adjustment. The water effluent from the reuse neutralization tank is diverted to the effluent pipeline after clarity detection, or it passes through an activated carbon filter before entering the effluent pipeline.

[0045] The outlet pipeline is equipped with a pH detection device, a first return pipe, a standard discharge outlet, a heavy metal detection device, a second return pipe, an ammonia nitrogen detection device, a third return pipe, a booster pump, and several electric valves. The first return pipe connects the outlet pipeline and the temporary storage tank and is controlled by the pH detection device. The second return pipe connects the standard discharge outlet and the combined regulating tank and is controlled by the heavy metal detection device. The third return pipe connects the standard discharge outlet and the recycled water tank and is controlled by the ammonia nitrogen detection device.

[0046] Municipal solid waste leachate is pumped into a homogenization tank, then pumped again into a biological treatment tank group, where it sequentially undergoes primary denitrification, primary nitrification, secondary denitrification, and secondary nitrification. Subsequently, it undergoes sludge-water separation via an ultrafiltration system. The ultrafiltration clarified liquid is then further treated in a nanofiltration system. The nanofiltration permeate is treated in an ozone reactor and discharged after meeting emission standards; the nanofiltration concentrate, after coagulation and sedimentation, is returned to the ozone reactor and reinjected into the storage area. The sludge treatment system uses centrifuges to dewater the biological sludge, which is then landfilled; odors are treated by a deodorization system to meet emission standards.

[0047] After collection, the leachate from the fly ash storage area enters the leachate equalization tank, where homogenization is completed. The effluent from the equalization tank directly enters the reduction tank for acidification and reduction reactions to remove oxidizing toxic substances, including hexavalent chromium, while also removing color. The effluent from the reduction tank enters the oxidation neutralization tank for oxidation and acid-base neutralization reactions, primarily involving the addition of NaOH and other reagents to induce the precipitation of heavy metals from the wastewater. The effluent then enters the flocculation tank where flocculants and coagulants are added to destabilize and flocculate the precipitated heavy metal pollutant particles. In the inclined tube sedimentation tank, heavy metal sludge and wastewater are separated, completing the sedimentation process. The effluent from the sedimentation tank enters the intermediate water tank to provide water flow regulation for subsequent filtration equipment. The effluent from the intermediate water tank enters a sand filter and carbon filter for advanced treatment. To ensure compliance with GB16889-2008 Table 2 standards, a shared reverse osmosis unit is installed as a safety device (shared with the emergency municipal solid waste leachate treatment system) to guarantee effective removal of heavy metals. Sludge from the inclined tube sedimentation tank is pumped into a sludge storage tank. Reverse osmosis concentrate enters the fly ash leachate equalization tank. Heavy metal sludge is directly transported off-site, while the supernatant is returned to the equalization tank. Bypass pipelines are installed in all stages, including the reduction tank, oxidation-neutralization tank, flocculation tank, sand filter, carbon filter, and reverse osmosis unit. Because the heavy metal content of the fly ash leachate exceeds design requirements, deep sedimentation and secondary stratification are performed in addition to the primary inclined tube sedimentation tank, resulting in supernatant overflowing to the sand and carbon filters. A breakpoint chlorination deep oxidation tank is added to the existing process to reduce ammonia nitrogen and total nitrogen levels, which cannot be removed in the previous stages, to within limits. The effluent is then pH-adjusted in a reclaimed water pH equalization tank until pH stability is achieved before final compliant discharge.

[0048] A further feature of the present invention is that the fly ash leachate treatment equipment is provided in parallel with two sets of inclined tube sedimentation tanks, a sand filter, a carbon filter, and a recycled water tank. The flocculation tank is connected to the two sets of inclined tube sedimentation tanks by a branch pipe and is equipped with a manual valve for controlling the on / off state. The two sets of recycled water tanks are respectively connected to a temporary storage tank.

[0049] The system is activated by connecting two sets of equipment in parallel, based on the increase in leachate volume in the fly ash storage area.

[0050] The temporary storage tank is connected to a shared reverse osmosis unit or an NF nanofiltration concentration tank.

[0051] The combined regulating tank is connected to the fly ash storage area and each transfer storage area by a municipal solid waste regulating tank.

[0052] The system also includes evaporation / distillation equipment.

[0053] Using the above technical solution, the evaporation / distillation method utilizes high temperature to remove volatile components (recalcitrant organic matter) from the leachate membrane treatment concentrate with steam, thereby reducing the volume of the original liquid. Installing evaporation / distillation equipment significantly improves four indicators (ammonia nitrogen, ...).

[0054] The standards for total nitrogen, COD, and hexavalent chromium were met. The table below shows a comparison of the test data before and after testing.

[0055] Table 1. Results of two distillation experiments at the landfill (at room temperature)

[0056] 2019 / 5 / 10 Original solution (effluent from the equalization tank) distillate Leachate treatment system effluent distillate Limit Hexavalent chromium (mg / L) ND 0.0129 0.05 Total nitrogen (mg / L) 12.01 9.83 40 Ammonia nitrogen (mg / L) 14.94 2.48 25 COD (mg / L) 17.55 47.42 100 TDS (mg / L) 28.6 49.1 - Chloride ions (mg / L) 11.00 0.811 - Electrical conductivity (μs / cm) 56.70 97.7 - 2019 / 5 / 15 Original solution (effluent from the equalization tank) distillate Leachate treatment system effluent distillate Limit Hexavalent chromium (mg / L) 0.065 0.013 0.05 Total nitrogen (mg / L) 6.52 9.24 40 Ammonia nitrogen (mg / L) 6.908 18.97 25 COD (mg / L) 10.32 8.48 100 TDS (mg / L) 20.6 24.6 - Chloride ions (mg / L) 1.32 10.8 - Electrical conductivity (μs / cm) 41.2 49.3 -

[0057] The beneficial effects of this invention are as follows: By redesigning traditional fly ash landfills, an emergency disposal solution is provided for the excess municipal solid waste generated when incineration capacity is reduced due to sudden equipment failure. This allows the landfill to flexibly convert the reserved emergency municipal solid waste landfill area into a fly ash landfill area after emergency disposal of municipal solid waste and fly ash storage area to the required elevation. Furthermore, a complete treatment system for municipal solid waste leachate and fly ash leachate is designed for the landfill. The use of shared devices reduces the cost of the treatment system, and the overall treatment process is improved accordingly.

[0058] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for treating leachate from a waste ecological landfill, characterized in that: It includes a landfill area, emergency domestic waste leachate treatment equipment, fly ash leachate treatment equipment and a shared reverse osmosis unit. The landfill area includes an emergency domestic waste storage area and a fly ash storage area. The emergency domestic waste storage area is equipped with several dividing dams at intervals to form several repurpose storage areas. The emergency domestic waste leachate treatment equipment includes a domestic waste equalization tank, a water quality equalization tank, a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank, a UF ultrafiltration device, an NF nanofiltration device, a coagulation sedimentation device, a first high-efficiency jet ozone reactor, a second high-efficiency jet ozone reactor, and a sludge dewatering device. The domestic waste equalization tank is connected to the pipelines of each transfer storage area, and the pipeline opening and closing are controlled separately. The domestic waste equalization tank collects leachate from domestic waste and pumps it to the water quality equalization tank. Then it flows through the primary denitrification tank, the primary nitrification tank, the secondary denitrification tank, and the secondary nitrification tank in sequence, and performs aeration, carbon source addition, denitrification reflux, and heat exchange and temperature regulation between each nitrification tank and the denitrification tank. The effluent from the secondary nitrification tank enters the UF ultrafiltration unit, the ultrafiltration concentrate produced by the UF ultrafiltration unit is fed into the primary denitrification tank, the excess sludge produced is introduced into the sludge dewatering unit, and the clear liquid produced enters the NF nanofiltration unit. The concentrated liquid produced by the NF nanofiltration device is introduced into the coagulation sedimentation device, the sludge produced by the coagulation sedimentation device is introduced into the sludge dewatering system, and the clear liquid produced is treated by the second high-efficiency jet ozone reactor and then returned to the tank. The clarified liquid produced by the NF nanofiltration device is tested and then either introduced into the first high-efficiency jet ozone reactor for treatment to meet discharge standards or introduced into a shared reverse osmosis device. The fly ash leachate treatment equipment includes a combined equalization tank, a reduction reaction tank, a neutralization reaction tank, a flocculation tank, an inclined tube sedimentation tank, a sand filter, a carbon filter, a reclaimed water tank, a temporary storage tank, a reclaimed neutralization tank, an activated carbon filter, and an effluent pipeline. The combined equalization tank is connected to the fly ash storage area and each transfer storage area via pipelines, and the pipelines are controlled to open and close separately. After the fly ash leachate is collected and homogenized in the combined equalization tank, it is pumped to the reduction reaction tank for acidification and reduction reaction, and then introduced into the neutralization reaction tank for oxidation reaction and acid-base neutralization reaction. After that, it is introduced into the flocculation tank to add flocculants and coagulants. After flocculation, it is introduced into the inclined tube sedimentation tank to separate the heavy metal sludge and wastewater, and complete the sedimentation. The heavy metal sludge is introduced into the sludge tank for concentration and off-site treatment. The clarified liquid from the inclined tube sedimentation tank is introduced into a sand filter and a carbon filter for deep treatment, and then enters a recycled water tank. The temporary storage tank is connected to the recycled water tank, a shared reverse osmosis unit, and a recycled neutralization tank. The shared reverse osmosis unit selectively connects to the clarified liquid produced by the NF nanofiltration unit or to the temporary storage tank according to the processing volume and processing time period. The water in the temporary storage tank is filtered and pressurized through a multi-stage reverse osmosis unit and then pumped to a reuse neutralization tank for pH adjustment. The water effluent from the reuse neutralization tank is diverted to the effluent pipeline after clarity detection, or it passes through an activated carbon filter before entering the effluent pipeline. The outlet pipeline is equipped with a pH detection device, a first return pipe, a standard discharge outlet, a heavy metal detection device, a second return pipe, an ammonia nitrogen detection device, a third return pipe, a booster pump, and several electric valves. The first return pipe connects the outlet pipeline and the temporary storage tank and is controlled by the pH detection device. The second return pipe connects the standard discharge outlet and the combined regulating tank and is controlled by the heavy metal detection device. The third return pipe connects the standard discharge outlet and the recycled water tank and is controlled by the ammonia nitrogen detection device.

2. The method for treating leachate from an ecological landfill according to claim 1, characterized in that: The fly ash leachate treatment equipment is equipped with two sets of inclined tube sedimentation tanks, a sand filter, a carbon filter, and a recycled water tank connected in parallel. The flocculation tank is connected to the two sets of inclined tube sedimentation tanks by a branch pipe and is equipped with a manual valve to control the on / off state. The two sets of recycled water tanks are respectively connected to a temporary storage tank.

3. The method for treating leachate from an ecological landfill according to claim 2, characterized in that: The combined regulating tank is connected to the fly ash storage area and each transfer storage area by a municipal solid waste regulating tank.

4. The method for treating leachate from an ecological landfill according to claim 3, characterized in that: The system also includes evaporation / distillation equipment.

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