Advanced treatment system for leachate of waste incineration power plant

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a waste incineration power plant leachate advanced treatment system which comprises a membrane softening and filtering unit, a first dosing device, a second dosing device, a third dosing device, a primary reverse osmosis unit and an electrodialysis unit, effluent of the leachate biological treatment system is guided into an inlet of the membrane softening and filtering unit, and an outlet of the membrane softening and filtering unit is connected with an inlet of the primary reverse osmosis unit; the first dosing device, the second dosing device and the third dosing device are respectively connected with the membrane softening and filtering unit; an outlet of the primary reverse osmosis unit is connected with an inlet of the electrodialysis unit; and the treated effluent is discharged from the outlet of the electrodialysis unit. Membrane softening filtration is used as a pretreatment measure of the membrane treatment system, so that the content of impurities such as hardness ions, active silicon, suspended matters and organic matters in inlet water of the membrane system can be effectively reduced, and the water recovery rate of the membrane treatment system is favorably improved; meanwhile, the occupied area and the cost are saved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology and discloses a deep treatment system for leachate from a waste incineration power plant. Background Technology

[0002] Waste-to-energy incineration has gradually become an important way to solve urban waste disposal due to its advantages such as small footprint, large processing capacity, and ability to recover heat and generate electricity. Leachate from waste-to-energy incineration plants refers to the liquid that seeps out during the storage and stockpiling of municipal solid waste in waste storage pits. The quality of leachate is often very complex, generally containing high concentrations of organic matter, salt, suspended solids, ammonia nitrogen, and a certain amount of heavy metals. Improper treatment can not only pollute soil and surface water sources but also potentially pollute groundwater, leading to environmental incidents.

[0003] Currently, a combined process of "pretreatment + biological treatment + advanced treatment" is generally recommended for leachate treatment from waste-to-energy incineration plants. The main purpose of pretreatment is to remove large particulate solids and some ammonia nitrogen, or to improve the biodegradability of the leachate. The biological treatment unit primarily aims to remove organic matter and nutrients such as nitrogen and phosphorus, and currently, a combination of anaerobic biological treatment methods (UASB, UBF, etc.) and aerobic biological treatment methods (MBR) is commonly used. The purpose of advanced treatment is to further remove residual recalcitrant organic matter, suspended solids, and dissolved salts after biological treatment, and advanced treatment currently mainly utilizes membrane treatment methods such as nanofiltration and reverse osmosis.

[0004] However, because landfill leachate typically contains a large amount of hardness ions (CaO)... 2+ Mg 2+ During the membrane concentration process in advanced treatment, scale-forming substances such as ions and activated silica combine with anions like carbonate, hydroxide, and sulfate. If the concentration exceeds their solubility product, precipitates such as calcium carbonate, magnesium hydroxide, calcium sulfate, and silica scale will form and adhere to the membrane surface. Furthermore, even after biological treatment, landfill leachate still retains a certain amount of humic acids, microbial flocs, cell debris, and other organic matter. These substances may adsorb and deposit on the membrane surface in advanced treatment systems, forming organic scale, or combine with inorganic ions, promoting the formation of inorganic scale. Severe scaling problems can cause internal blockage of the membrane treatment equipment, leading to the inability of the leachate treatment system to operate normally. Although adding scale inhibitors or acid can alleviate scaling to some extent, it cannot completely prevent the crystallization and precipitation of scale-forming ions on the membrane surface. Additionally, if the scale inhibitor is of poor quality or incompatible with the leachate water quality, it will not achieve its normal scale-inhibiting effect. Some waste-to-energy plants deliberately lower the recovery rate of their leachate treatment systems to prevent scaling on the membrane surfaces, resulting in low efficiency of the deep treatment systems, overburdened equipment, and a large amount of concentrated wastewater that cannot be disposed of, putting enormous environmental pressure on the power plant's operations. Utility Model Content

[0005] To address existing problems, this utility model provides a deep treatment system for leachate from waste incineration power plants. By using membrane softening filtration as a pretreatment measure for the membrane treatment system, it can effectively reduce the content of impurities such as hardness ions, active silica, suspended solids, and organic matter in the influent of the membrane system, which is conducive to improving the water recovery rate of the membrane treatment system. At the same time, it saves space and costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A deep treatment system for leachate from a waste incineration power plant, used to treat effluent from a biological leachate treatment system, is characterized by comprising a membrane softening filtration unit, a first dosing device, a second dosing device, a third dosing device, a primary reverse osmosis unit, and an electrodialysis unit; the effluent from the biological leachate treatment system is introduced into the inlet of the membrane softening filtration unit, and the outlet of the membrane softening filtration unit is connected to the inlet of the primary reverse osmosis unit; the first, second, and third dosing devices are respectively connected to the membrane softening filtration unit; the concentrate outlet of the primary reverse osmosis unit is connected to the inlet of the electrodialysis unit; and the treated effluent is discharged from the outlet of the electrodialysis unit.

[0008] As a further improvement of this utility model, it also includes a product water tank; the outlet of the first-stage reverse osmosis unit includes a fresh water outlet and a concentrated water outlet; the fresh water outlet of the first-stage reverse osmosis unit is connected to the product water tank; the concentrated water outlet of the first-stage reverse osmosis unit is connected to the inlet of the electrodialysis unit.

[0009] As a further improvement of this utility model, it also includes a concentrate reverse osmosis unit and a final concentrate tank; the outlet of the electrodialysis unit includes a freshwater outlet and a concentrate outlet; the freshwater outlet of the electrodialysis unit is connected to the concentrate reverse osmosis unit; the concentrate outlet of the electrodialysis unit is connected to the final concentrate tank; the freshwater outlet of the concentrate reverse osmosis unit is connected to the freshwater outlet of the first-stage reverse osmosis unit and flows into the product water tank; the concentrate outlet of the electrodialysis unit is connected to the concentrate outlet of the concentrate reverse osmosis unit and flows into the final concentrate tank.

[0010] As a further improvement of this utility model, the membrane softening filtration unit includes an intermittent sludge pump for intermittently discharging sludge and transporting it to the power plant leachate biological treatment system.

[0011] As a further improvement of this utility model, a membrane softening filter is provided inside the membrane softening filtration unit.

[0012] As a further improvement of this utility model, the membrane softening filter is provided with an external pressure membrane assembly, which is a tubular membrane or a bag membrane.

[0013] As a further improvement of this utility model, the material of the external pressure membrane is polytetrafluoroethylene.

[0014] As a further improvement of this utility model, the electrodialysis unit includes alternating anion and cation exchange membranes and alternating concentration and dilute compartment partitions between adjacent ion exchange membranes.

[0015] As a further improvement of this utility model, the anion and cation exchange membranes are heterogeneous membranes or homogeneous membranes.

[0016] As a further improvement of this utility model, the agent added in the first dosing device is a flocculant, the agent added in the second dosing device is a hardness remover, and the agent added in the third dosing device is a silicon remover.

[0017] This utility model has the following beneficial effects:

[0018] This invention efficiently treats the effluent from a leachate biological treatment system. Through the combination of multiple treatment units, it achieves deep purification of the leachate, improves effluent quality, and meets the plant's recycling requirements. Employing a membrane softening filter, it simultaneously realizes softening reaction, coagulation sedimentation, and membrane filtration within a single unit. Compared to the conventional "clarification tank + filter / filter + ultra / microfiltration device" softening process, the membrane softening filter can efficiently remove hardness ions and organic matter, avoiding the use of nanofiltration membranes. This solves the problems of easy clogging and short lifespan of nanofiltration membranes in traditional leachate treatment, which are prone to retaining divalent ions and organic matter. It saves the high cost of frequent nanofiltration membrane replacements and significantly improves the treatment efficiency for leachate with high organic content. Simultaneously, multiple dosing devices are installed, allowing for selective removal of various impurities in the influent to the membrane softening filter based on the characteristics of the raw water and the treatment objectives. This system has a simplified treatment process, a small footprint, a high system water recovery rate, and produces high-quality freshwater, improving the safety of the landfill leachate treatment system and reducing the environmental risks of waste incineration power plants.

[0019] Preferably, the product water tank can store the fresh water treated by the first-stage reverse osmosis unit, which is convenient for subsequent use or further treatment; at the same time, by treating the concentrate and fresh water from the first-stage reverse osmosis unit separately, the wastewater treatment efficiency and the final water resource recovery rate are improved.

[0020] Preferably, the concentrate reverse osmosis unit can further treat the desalination produced by the electrodialysis unit to further improve the desalination quality and meet the power plant's recycling requirements. The final concentrate tank is used to store a small amount of concentrate that cannot be reused, facilitating its subsequent recycling and disposal within the incineration plant.

[0021] Preferably, intermittent sludge discharge using a sludge pump can reduce sludge accumulation and prevent clogging of the membrane softening filter unit or impact on filtration efficiency. Simultaneously, transporting the sludge back to the power plant's leachate biological treatment system enables sludge recycling and reduces sludge treatment costs.

[0022] Preferably, the installation of a membrane softening filter can further improve the softening effect of the leachate, remove hardness ions and organic matter from the water, and provide more favorable conditions for subsequent reverse osmosis and electrodialysis treatment.

[0023] Preferably, external pressure membranes offer higher filtration efficiency and better fouling resistance, making them suitable for treating high-concentration, high-viscosity leachate. The structural design of tubular or bag-type membranes makes membrane modules easier to clean and maintain, extending membrane lifespan.

[0024] Preferably, PTFE material possesses excellent chemical stability and corrosion resistance, enabling it to resist the erosion of the membrane by chemicals in the leachate. Simultaneously, the smooth surface of PTFE material makes it difficult for contaminants to adhere, which helps maintain the membrane's filtration performance.

[0025] Preferably, the electrodialysis unit is designed to achieve selective ion permeation and concentration, enabling high-level concentration of the first-stage reverse osmosis concentrate and reducing the amount of concentrate generated by the system. Alternating anion and cation exchange membranes and concentrate / dilute compartment partitions make the electrodialysis process more efficient and stable.

[0026] Preferably, heterogeneous membranes and homogeneous membranes have different structural and performance characteristics, and can be selected according to actual needs. Heterogeneous membranes have higher ion selectivity and permeability, and are suitable for treating leachates with high salinity and high hardness; while homogeneous membranes have better mechanical strength and chemical stability, and are suitable for long-term operation and harsh environments.

[0027] Preferably, by adding different agents, different pollutants in the leachate can be removed. Flocculants can coagulate suspended solids and colloidal substances in the water, facilitating subsequent filtration; hardness removers can remove hardness ions such as calcium and magnesium from the water, preventing clogging and contamination of subsequent treatment units; and silica removers can remove silicate ions from the water, preventing the formation of silicate scale on the membrane surface. The addition of these agents makes the entire treatment system more complete and efficient. Attached Figure Description

[0028] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a deep treatment system for leachate from a waste incineration power plant according to the present invention.

[0030] The components include: 1. Membrane softening filtration unit; 2. First dosing device; 3. Second dosing device; 4. Third dosing device; 5. First-stage reverse osmosis unit; 6. Electrodialysis unit; 7. Concentrate reverse osmosis unit; 8. Product water tank; and 9. Final concentrate tank. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Example

[0035] like Figure 1 The system shown is a deep treatment system for leachate from a waste incineration power plant, used to treat the effluent from a biological leachate treatment system. It is characterized by comprising a membrane softening filtration unit 1, a first dosing device 2, a second dosing device 3, a third dosing device 4, a first-stage reverse osmosis unit 5, an electrodialysis unit 6, a product water tank 8, a concentrate reverse osmosis unit 7, and a final concentrate tank 9.

[0036] The effluent from the leachate biological treatment system is introduced into the inlet of the membrane softening filtration unit 1, and the outlet of the membrane softening filtration unit 1 is connected to the inlet of the first-stage reverse osmosis unit 5. The membrane softening filtration unit 1 adopts intermittent sludge discharge, and the discharged sludge is transported to the power plant leachate biological treatment system. A membrane softening filter is installed inside the membrane softening filtration unit 1. The intermittent sludge discharge of the membrane softening filter can also be automatically controlled. The sludge concentration discharged by the membrane softening filtration unit 1 is 5-10%, which is more than twice the sludge concentration of a conventional clarifier softening system, and can be treated together with the sludge from the leachate biological treatment unit.

[0037] The membrane softening filter is equipped with an external pressure membrane module, which can be a tubular or bag-type membrane. The external pressure membrane is made of polytetrafluoroethylene (PTFE), a high-molecular-weight material known for its high strength, fouling resistance, and resistance to strong acids, alkalis, and oxidizing agents. Water permeates through the membrane under the influence of gravity and static pressure, completing the filtration process without the need for a centrifugal pump or negative pressure suction. The external pressure membrane offers higher filtration efficiency and better fouling resistance, making it suitable for treating high-concentration, high-viscosity leachate. The tubular or bag-type membrane design facilitates cleaning and maintenance, extending the membrane's lifespan. The filtration accuracy of the external pressure membrane can reach 0.1~0.2μm. After filtration, the permeate turbidity is less than 0.3 NTU, and the sediment density index (SDI) is less than 5, meeting the feed water quality requirements of reverse osmosis systems.

[0038] The membrane softening filtration unit 1 is also connected to the first dosing device 2, the second dosing device 3, and the third dosing device 4, respectively. The first dosing device 2 can use a flocculant as the added agent, mainly used to remove suspended solids, colloidal substances, and some dissolved organic matter in the water. Through coagulation and flocculation, these substances are formed into larger particles, facilitating subsequent filtration or sedimentation removal. Common types are polyaluminum chloride (PAC) and polyacrylamide (PAM). The second dosing device 3 can use a hardness remover as the added agent, used to remove hardness ions in the water, mainly calcium and magnesium ions. These ions easily form scale in water, affecting the operating efficiency and lifespan of the equipment. Common types are lime, sodium carbonate, and sodium hydroxide, which can react with calcium and magnesium ions to form insoluble precipitates. The third dosing device 4 can use a silicon remover as the added agent, used to remove silicon compounds in the water, especially silicon dioxide. Silicon compounds can also form scale in water, affecting the performance of the equipment. Common types are poly(magnesium oxide), magnesium chloride, and sodium aluminate, which can react with silicates to form insoluble precipitates. Using flocculants first removes suspended solids and colloidal substances from the water, providing better treatment conditions for hardness removers and silica removers. Using hardness removers and silica removers later reduces the content of other impurities in the water when removing ions from the residual liquid after the precipitation of suspended solids and colloidal substances.

[0039] The membrane softening filter integrates multiple processes—softening reaction, coagulation sedimentation, and membrane filtration—into a single unit. Compared to the conventional "clarification tank + filter / filter + ultra / microfiltration device" softening process, the membrane softening filter achieves highly efficient removal of hardness ions and organic matter, eliminating the need for nanofiltration membranes. This solves the problems of easy clogging and short lifespan of nanofiltration membranes in traditional leachate treatment, which are prone to retaining divalent ions and organic matter. It also saves the high cost of frequent nanofiltration membrane replacements and significantly improves the treatment efficiency of leachate with high organic content.

[0040] The outlet of the first-stage reverse osmosis unit 5 includes a freshwater outlet and a concentrated water outlet; the freshwater outlet of the first-stage reverse osmosis unit 5 is connected to the product water tank 8; the concentrated water outlet of the first-stage reverse osmosis unit 5 is connected to the inlet of the electrodialysis unit 6.

[0041] The outlet of the electrodialysis unit 6 includes a freshwater outlet and a concentrated water outlet; the freshwater outlet of the electrodialysis unit 6 is connected to the concentrated water reverse osmosis unit 7; the concentrated water outlet of the electrodialysis unit 6 is connected to the final concentrated water tank 9; the freshwater outlet of the concentrated water reverse osmosis unit 7 is connected to the freshwater outlet of the first-stage reverse osmosis unit 5 and flows into the product water tank 8. The recovered liquid stored in the product water tank 8 can be used as a concentrated liquid for the water produced by the deep treatment system, and can be used for flue gas deacidification and pulping or fly ash solidification systems in waste incineration power plants; the concentrated water outlet of the electrodialysis unit 6 is connected to the concentrated water outlet of the concentrated water reverse osmosis unit 7 and flows into the final concentrated water tank 9.

[0042] The electrodialysis unit 6 includes alternating anion and cation exchange membranes and alternating concentrate and dilute compartment partitions between adjacent ion exchange membranes. The anion and cation exchange membranes are heterogeneous membranes or homogeneous membranes.

[0043] The working process of this utility model is as follows:

[0044] After pretreatment and biological treatment, the leachate from waste incineration power plants has significantly reduced the levels of solid impurities, organic matter, nitrogen, phosphorus, and other pollutants, but it still cannot meet the plant's recycling requirements. Therefore, the permeate from the biological treatment system is first introduced into membrane softening filtration unit 1. The membrane softening filter has a steel internal corrosion-resistant structure and combines multiple functions such as softening reaction, coagulation sedimentation, and membrane filtration.

[0045] The first dosing device 2, the second dosing device 3, and the third dosing device 4 are introduced from the top of the equipment. Hardness ions, active silica, suspended solids, colloids, and other substances in the influent react with the added chemical agents to generate precipitates such as calcium carbonate, magnesium hydroxide, calcium silicate, magnesium silicate, and sodium aluminosilicate. At the same time, these precipitates are entrained and adsorbed together with the coagulated suspended solids and colloids, and settle inside the equipment.

[0046] The membrane softening filtration equipment has external pressure tubular or bag-type membrane modules arranged vertically inside. The influent water passes through the membrane under the action of gravity static pressure difference and becomes the product water. Large particles of sediment and flocs, because their diameter is larger than the membrane filtration pore size, are trapped on the outer surface of the membrane, thus completing the solid-liquid separation and purification process. The softening filter has a sludge accumulation area at the bottom, and the sludge is automatically discharged at timed intervals and treated together with the sludge of the biological treatment system.

[0047] The permeate from the membrane softening filtration unit 1 is introduced into the first-stage reverse osmosis unit 5. Due to the deep filtration and softening treatment, the recovery rate of the first-stage reverse osmosis system can reach up to 85%. After reverse osmosis desalination treatment, the salinity of the permeate is about 300~500mg / L, and it directly enters the product water tank 8.

[0048] The main components of the primary reverse osmosis concentrate are concentrated sodium chloride, sodium sulfate, and a small amount of organic matter. This is because the electrodialysis system has a high COD content in the feed water. Cr The requirements are relatively lenient; reverse osmosis concentrate can be directly introduced into electrodialysis unit 6. The core equipment of electrodialysis unit 6 is the electrodialyzer, which consists of alternating anion and cation exchange membranes and concentrate and dilute chamber partitions. The ion exchange membranes can be homogeneous or heterogeneous membranes. Under the action of an applied DC electric field, the selective permeability of the ion exchange membranes allows the anions and cations to move toward the anode and cathode, respectively, simultaneously achieving water desalination and salt concentration.

[0049] After circulation and concentration, the final concentrated water discharged from electrodialysis unit 6 has a salt content of over 200,000 mg / L. The overall freshwater recovery rate of the electrodialysis system is approximately 75%, but the salt content is still too high. Therefore, it is introduced into the concentrated water reverse osmosis unit 7 for secondary desalination treatment. The concentrated water reverse osmosis unit 7 has a system recovery rate of approximately 50%, and the product water has a salt content ≤500 mg / L, which can be recycled into the product water tank 8. The concentrated water produced by the concentrated water reverse osmosis unit 7 and the concentrated water from electrodialysis unit 6 are discharged together into the final concentrated water tank 9.

[0050] After the above combined process, the total water recovery rate of the leachate deep treatment system can reach more than 90%. Fresh water can be recycled and used as supplementary water for power plant circulating water. About 10% of the concentrate can be reused in the power plant flue gas desulfurization system for lime slurry preparation or as fly ash solidification water, ultimately achieving zero discharge of leachate from the waste incineration plant.

[0051] The above embodiments are merely one of the implementation methods for achieving the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that are easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A leachate advanced treatment system for a waste incineration power plant, for further treating effluent from a leachate biological treatment system, characterized by, The system comprises a membrane softening filter unit (1), a first dosing device (2), a second dosing device (3), a third dosing device (4), a first reverse osmosis unit (5) and an electrodialysis unit (6); the leachate biological treatment system effluent is introduced into the inlet of the membrane softening filter unit (1), the outlet of the membrane softening filter unit (1) is connected with the inlet of the first reverse osmosis unit (5); the first dosing device (2), the second dosing device (3) and the third dosing device (4) are connected with the membrane softening filter unit (1) respectively; the outlet of the first reverse osmosis unit (5) is connected with the inlet of the electrodialysis unit (6); the outlet of the electrodialysis unit (6) discharges the treated effluent.

2. The leachate deep treatment system of a waste incineration power plant according to claim 1, characterized in that, The system further comprises a product water tank (8); the outlet of the first reverse osmosis unit (5) comprises a fresh water outlet and a concentrated water outlet; the fresh water outlet of the first reverse osmosis unit (5) is connected with the product water tank (8); the concentrated water outlet of the first reverse osmosis unit (5) is connected with the inlet of the electrodialysis unit (6).

3. The leachate advanced treatment system of a waste incineration power plant according to claim 2, characterized in that, The system further comprises a concentrated water reverse osmosis unit (7) and a final concentrated water tank (9); the outlet of the electrodialysis unit (6) comprises a fresh water outlet and a concentrated water outlet; the fresh water outlet of the electrodialysis unit (6) is connected with the concentrated water reverse osmosis unit (7); the concentrated water outlet of the electrodialysis unit (6) is connected with the final concentrated water tank (9); the fresh water outlet of the concentrated water reverse osmosis unit (7) is connected with the fresh water outlet of the first reverse osmosis unit (5) and is merged into the product water tank (8); the concentrated water outlet of the electrodialysis unit (6) is connected with the concentrated water outlet of the concentrated water reverse osmosis unit (7) and is merged into the final concentrated water tank (9).

4. The leachate advanced treatment system of a waste incineration power plant according to claim 1, characterized in that, The membrane softening filter unit (1) comprises an intermittent sludge discharge pump for intermittently discharging sludge and delivering to the leachate biological treatment system of the power plant.

5. The leachate advanced treatment system of a waste incineration power plant according to claim 4, characterized in that, The membrane softening filter unit (1) is internally provided with a membrane softening filter.

6. The leachate advanced treatment system of a waste incineration power plant according to claim 5, characterized in that, The membrane softening filter is internally provided with an external pressure type membrane assembly, and the external pressure type membrane is a tubular membrane or a bag type membrane.

7. The leachate advanced treatment system of a waste incineration power plant according to claim 6, characterized in that, The material of the external pressure type membrane is polytetrafluoroethylene. 8.The leachate deep treatment system of a waste incineration power plant according to claim 1, characterized in that, The electrodialysis unit (6) comprises alternatingly arranged cation and anion exchange membranes and alternatingly arranged concentrated and dilute chamber separators between adjacent ion exchange membranes.

9. The leachate advanced treatment system of a waste incineration power plant according to claim 8, characterized in that, The cation and anion exchange membranes are heterogeneous membranes or homogeneous membranes.

10. The leachate advanced treatment system of a waste incineration power plant according to claim 1, characterized in that, The agent added in the first dosing device (2) is a flocculating agent, the agent added in the second dosing device (3) is a hardness removal agent, and the agent added in the third dosing device (4) is a silicon removal agent.

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