Synergistic zero discharge method and system for wastewater of household garbage incineration power plant

Abstract

The invention discloses a synergistic zero discharge method and system for waste water of a household garbage incineration power plant, which comprises the steps of waste water classified collection, waste water quality-divided treatment and resource recycling: classifying waste water into high-concentration organic waste water and low-concentration inorganic waste water aiming at CODCr (Chemical Oxygen Demand), and performing quality-divided treatment in a targeted manner; a split type MBR treatment mode is used in the treatment process of high-concentration organic wastewater, DTRO is added to guarantee the treatment effect, concentrated water is subjected to gradient utilization to guarantee the recovery effect, zero emission is achieved, the treatment efficiency is improved, the water quality of recycled water is stabilized, and modularization provides a basis for intelligent control.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment in garbage incineration power plants, and in particular to a coordinated zero-emission method and system for wastewater in a domestic garbage incineration power plant. Background Art

[0002] During the operation of garbage incineration power plants, various wastewaters are generated, including leachate, plant flushing water, chemical water workshop wastewater, boiler wastewater, circulating pool wastewater, integrated water purifier wastewater, initial rainwater and domestic sewage. The amount of these wastewaters fluctuates greatly, and they contain a variety of pollutants of different concentrations, such as heavy metals, salts, organic matter, ammonia nitrogen and suspended solids, with diverse components and complex water quality. If discharged directly, it will cause serious pollution to the surface water and groundwater environment. Therefore, wastewater treatment in garbage incineration power plants has become an important issue in the field of environmental protection.

[0003] At present, wastewater treatment is basically centralized after the whole plant collects it. The treatment technologies used mainly include physical and chemical treatment, biological treatment and membrane treatment. Physical and chemical treatment often uses coagulation, sedimentation, filtration and other methods, which can effectively remove suspended matter and some organic pollutants in wastewater. Biological treatment uses the metabolism of microorganisms to convert organic pollutants into carbon dioxide and water. Membrane treatment separates pollutants and salts in wastewater through membrane technologies such as ultrafiltration, microfiltration and reverse osmosis. Although existing wastewater treatment technologies can effectively remove some pollutants in wastewater, there are still some problems and limitations. First, most of the existing technologies can only treat wastewater in a single way, while the wastewater quality of waste incineration power plants is complex and basically not classified. The treatment is not targeted, resulting in a large area and low treatment efficiency. Secondly, the existing technology still has a certain amount of pollutants and salts in the treated wastewater, which cannot fully meet the standards for reused water, limiting the reuse rate of wastewater. Finally, when treating landfill leachate, existing technologies usually require the addition of a large amount of chemical agents, or the use of membrane concentration or evaporation concentration methods, which not only increases the treatment cost, but also produces a large amount of concentrated liquid that is difficult to dispose of during the treatment process, making it difficult to achieve zero wastewater discharge. Therefore, there is an urgent need for an economical and efficient process system that can achieve zero wastewater discharge. Summary of the invention

[0004] The present invention provides a method and system for coordinated zero-emission of wastewater from a domestic waste incineration power plant. Compared with the existing wastewater treatment method for a waste incineration power plant, the technical solution mainly solves the following technical problems: 1. For the problems of low treatment efficiency, large land occupation and high operating cost caused by unclassified and untargeted wastewater treatment, different pretreatment methods are adopted for different types of wastewater through refined classification to improve the treatment efficiency and facilitate subsequent deep treatment; 2. To address the problem of wastewater that does not meet the standards and cannot be reused, after classified collection, high-concentration wastewater and low-concentration wastewater treatment targets are accurately treated. Combined with the reuse water standards, the treatment water output rate is improved through innovative integration of treatment processes, so that the treated wastewater meets the reuse water standards and can be reused in the entire plant, thereby increasing the reuse rate of wastewater and saving water resources; 3. In view of the high cost of leachate treatment, environmental pollution risks and the inability to achieve zero emission, the thorough harmless treatment and disposal of leachate membrane concentrate is the key to truly achieving "zero emission" for industrial wastewater and leachate in waste incineration power plants. After reduction through integrated process treatment, the membrane concentrate is preferentially used for fly ash stabilization and lime slurry preparation. The concentrate that cannot be reused is incinerated together with the garbage to achieve cascade utilization, breaking through the drawbacks of traditional concentrate evaporation crystallization or landfill treatment methods, reducing energy consumption and achieving zero wastewater emission.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for coordinated zero discharge of wastewater from a domestic waste incineration power plant, comprising the following steps: Wastewater classification and collection: Wastewater is divided into high-concentration organic wastewater and low-concentration inorganic wastewater according to CODCr and collected separately. The high-concentration organic wastewater has a CODCr of 200mg / L<CODCr≤70000mg / L, and the low-concentration inorganic wastewater has a CODCr of ≤200mg / L; Wastewater separation treatment: high-concentration organic wastewater and low-concentration inorganic wastewater are treated separately. High-concentration organic wastewater is passed into the high-concentration wastewater treatment system, and low-concentration inorganic wastewater is passed into the low-concentration wastewater treatment system; High-concentration organic wastewater treatment: The high-concentration organic wastewater is sequentially treated by regulating tank pretreatment, anaerobic reaction treatment, MBR treatment, NF treatment, RO treatment and DTRO treatment to finally form treated clean water and membrane concentrate. Among them, the MBR treatment includes two-stage A / O treatment and UF treatment connected in series; Low-concentration inorganic wastewater treatment: low-concentration inorganic wastewater is sequentially processed through regulating tank pretreatment, softening sedimentation treatment, UF treatment and RO treatment to finally form treated clean water and membrane concentrate; Clean water recycling: The treated clean water formed by high-concentration organic wastewater treatment and low-concentration inorganic wastewater treatment enters the circulating water pool for reuse within the factory; Gradient utilization of membrane concentrate: The membrane concentrate formed by low-concentration inorganic wastewater treatment directly enters the lime slurry preparation system for utilization; The membrane concentrate formed by the treatment of high-concentration organic wastewater is first utilized in the fly ash stabilization system, and the remaining part is then utilized in the lime slurry preparation system, and finally the remaining part is processed by the waste incineration synergistic treatment.

[0006] Preferably, the purified water output rates of the high-concentration organic wastewater treatment and the low-concentration inorganic wastewater treatment are both not less than 80%.

[0007] As a more preferred embodiment, the pretreatment in the high-concentration organic wastewater treatment includes the wastewater in the leachate sedimentation tank reaching the regulating tank by overflow, the hydraulic retention time HRT of the regulating tank is 10d, the sludge in the primary sedimentation tank is transported to the sludge concentration tank for collection by a sludge pump, and the wastewater in the regulating tank is anaerobic treated; Anaerobic treatment in high-concentration organic wastewater treatment includes: the wastewater from the equalization tank is transported to the anaerobic tank through the equalization tank lift pump. Through anaerobic reaction, the organic matter in the wastewater is partially degraded to produce biogas, which is collected and utilized. The hydraulic retention time HRT is 12d, the temperature is controlled at 32~38℃, the pH value is controlled in the range of 6.2~7.8, the sludge concentration MLSS is 60g / L, the effluent CODCr≤12320mg / L, BOD5≤7875mg / L, and NH3-N≤2600mg / L.

[0008] Furthermore, the MBR treatment in the high-concentration organic wastewater treatment adopts a split membrane biochemical reactor, including a bioreactor treatment unit containing two-stage A / O treatment and an ultrafiltration treatment unit containing UF treatment. After the ultrafiltration treatment unit separates and purifies the water, the sludge is returned to the bioreactor treatment unit to make the sludge concentration in the bioreactor reach 10~30g / L.

[0009] Furthermore, the bioreactor treatment unit includes two parts: a nitrification stage and a denitrification stage. In the nitrification stage, a pipeline is provided at the outlet pipe of the UASB water inlet pump, which passes over the UASB reactor and directly enters the denitrification tank, so as to avoid excessive degradation of BOD5 in the UASB reactor, resulting in insufficient carbon source for the nitrification / denitrification system; in the denitrification stage, the ability to reduce nitrate and nitrite to nitrogen gas is improved by refluxing a large amount of the mixed liquid after nitrification.

[0010] Specifically, the parameters of the bioreactor treatment unit are: bioreactor system temperature is 28~35°C, pH is 6.5~8.5, sludge concentration is 6~10g / L, dissolved oxygen above the primary A pool is ≤0.5mg / L, dissolved oxygen above the secondary O pool is 2~4mg / L, primary denitrification residence time is 2.9d, and primary nitrification residence time is 7.1d.

[0011] More specifically, the ultrafiltration treatment unit adopts an organic cross-flow tubular membrane with a pore size of 0.02µm and a maximum pressure of 6bar. The parameters of the ultrafiltration treatment unit are: conductivity ≤15000us / cm, CODCr ≤500mg / L, BOD5 ≤80mg / L, SS ≤70mg / L.

[0012] In detail, the DTRO treatment parameters in the treatment of high-concentration organic wastewater are: the inlet pH is 6~6.5, the scale inhibitor is 5~12 PPM per ton of water, and the high-pressure pump outlet pressure is controlled at 5.2Mpa; the main control indicators of pure water outlet are pH 6~9, CODCr≤50mg / L, NH3-N≤5mg / L, and total dissolved solids≤1000mg / L.

[0013] A wastewater coordinated zero-discharge system for a domestic waste incineration power plant, used for implementing the above-mentioned wastewater coordinated zero-discharge method for a domestic waste incineration power plant, comprising a wastewater classification collection module, a wastewater quality treatment module and a resource utilization module connected in sequence; The wastewater classification and collection module is used to divide the wastewater into high-concentration organic wastewater and low-concentration inorganic wastewater according to CODCr and introduce them into corresponding regulating tanks respectively; The wastewater separation treatment module includes a high-concentration organic wastewater treatment submodule and a low-concentration inorganic wastewater treatment submodule that are independent of each other; The high-concentration organic wastewater treatment submodule comprises a first regulating tank, an anaerobic tank, a membrane bioreactor, a nanofiltration membrane filter, a first reverse osmosis membrane filter and a disc-tube reverse osmosis membrane filter connected in sequence, wherein the membrane bioreactor comprises two-stage A / O tanks and a first ultrafiltration membrane filter connected in series in sequence; The low-concentration inorganic wastewater treatment submodule comprises a second regulating tank, a softening reaction tank, a sedimentation tank, a second ultrafiltration membrane filter and a second reverse osmosis membrane filter which are connected in sequence; The resource utilization module includes a mutually independent clean water recycling submodule and a membrane concentrate gradient utilization submodule. The clean water recycling submodule is used to pass the clean water generated after treatment into a circulating water pool for reuse within the plant, and the membrane concentrate gradient utilization submodule passes the membrane concentrate generated after treatment into a concentrate pool, and transports it in sequence through a concentrate pump in the order of a fly ash stabilization system, a lime slurry preparation system, and a waste incineration boiler concentrate return spray system.

[0014] Preferably, each device in the high-concentration organic wastewater treatment submodule and the low-concentration inorganic wastewater treatment submodule is provided with sensors and instruments for monitoring corresponding key control parameters, each device corresponds to a PLC controller, the device, the sensors and instruments on the device are electrically connected to the corresponding PLC controller, all PLC controllers are connected to the DCS system in the central control room through wireless communication equipment, and various key control parameters are displayed in the central control room to remotely operate the on-site equipment and monitor the working conditions in real time.

[0015] Beneficial effects of the present invention: 1. Provide a good foundation: Wastewater is finely classified and collected according to the source of water quality and pollutant concentration, and divided into high-concentration organic wastewater and low-concentration inorganic wastewater, providing a good foundation for subsequent quality-based treatment and intelligent monitoring; 2. Improve treatment efficiency: Based on the refined classification of wastewater, this technology conducts modular treatment based on different water quality characteristics, such as high-concentration organic matter, ammonia nitrogen and salt content, and low-concentration organic matter and salt content. Targeted treatment processes are used for target pollutants, providing a good foundation for intelligent monitoring. For wastewater with high organic pollutants and heavy pollution, such as leachate, biological treatment is combined with membrane separation, that is, the integrated process "MBR (two-stage A / O + ultrafiltration) + NF (nanofiltration) + RO (reverse osmosis) + DTRO (disc tube reverse osmosis)" is used for treatment, which can significantly improve the effluent quality. The system's purified water output rate is more than 80%, and the effluent meets the standard of reused water for the whole plant. For low-pollution wastewater such as boiler fixed sewage and reverse osmosis concentrated water in the water treatment workshop, the water quality is relatively clean and can be directly transported to the circulating water pool for recycling. The rest enters the low-concentration wastewater treatment station for treatment and reuse. The cascade utilization of differentiated treatment reduces dependence on external water sources, improves treatment efficiency and water output rate, reduces treatment and maintenance costs, and saves land; 3. Collaborative treatment to achieve zero wastewater discharge: The classified collection and quality-based treatment modules work together, the qualified produced water enters the circulating water pool for reuse, and the concentrated liquid is used in a cascade manner to achieve the goal of zero wastewater discharge in the whole plant. This can not only effectively reduce the discharge of wastewater and reduce pollution to the environment, but also save water resources and realize resource recycling; 4. Stabilize the quality of recycled water: This technology aims at the fluctuation of water quality and quantity. In terms of wastewater treatment and reuse, it optimizes the process and adopts a process innovation integrated system. It adopts MBR (membrane bioreactor, two-stage A / O + ultrafiltration) combined process treatment. The ultrafiltration system adopts an external tubular membrane to improve the stability and impact resistance of the system. The NF system adopts a circulating pump to increase the flow rate of the membrane, reduce the risk of pollution and ensure the stability of the effluent. 5. Leachate membrane concentrate achieves cascade reduction and comprehensive utilization: DTRO further reduces the volume of reverse osmosis membrane concentrate to reduce the volume of concentrate. The resulting membrane concentrate has high salt content and high content of difficult-to-degrade organic matter. Its components are monitored and reused in the fly ash stabilization and lime slurry preparation process to promote the solidification and stabilization of heavy metal ions in fly ash by humus-like substances. For membrane concentrate that is difficult to reuse, cascade utilization is achieved through coordinated incineration with garbage, which breaks through the drawbacks of traditional concentrate evaporation crystallization or landfill treatment methods, efficiently integrates wastewater treatment with garbage incineration technology, and completely realizes the "reduction + harmless" treatment of concentrate. The combustible components in the concentrate (such as residual organic matter) are decomposed and release heat in the incinerator to achieve energy recovery, while reducing the risk of secondary pollution of the concentrate, and reducing the cost per ton of water and treatment fees (less than 1 / 2 and 1 / 10 of traditional leachate treatment technology); 6. Realize intelligence: Accurate classification and collection, modular quality-based treatment provide a good foundation for intelligence. Through the collection of process parameters and real-time terminal feedback during the treatment process, it provides visual results of water quality, allowing operators to remotely operate the on-site treatment system in a timely manner, ensuring the sewage treatment effect, ensuring compliance, and reducing environmental pollution risks; the intelligent platform makes the system easy to operate and convenient, and improves system stability and efficiency; In general, compared with existing technologies, this technology has better environmental protection effects, economic benefits and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall system module flow of the present invention; Figure 2 It is a schematic diagram of the process flow of a high-concentration wastewater treatment station of the present invention; DETAILED DESCRIPTION As follows, embodiments are further described with reference to the accompanying drawings.

[0017] like Figure 1~Figure 2 As shown, as a preferred embodiment 1, a method for coordinated zero discharge of wastewater from a domestic waste incineration power plant comprises the following steps: Wastewater classification and collection: Wastewater is divided into high-concentration organic wastewater and low-concentration inorganic wastewater according to CODCr and collected separately. The high-concentration organic wastewater is 200mg / L<CODCr≤70000mg / L, and the low-concentration inorganic wastewater is CODCr≤200mg / L. High-concentration wastewater comes from the garbage pool of the main plant, factory flushing and domestic sewage, etc. Under normal circumstances, CODCr is 30000~70000mg / L, and the salt content is 4000~5000mg / L; low-concentration wastewater is mainly industrial wastewater, which comes from chemical water preparation wastewater, boiler fixed discharge wastewater, circulating water pool sewage and integrated water purifier sewage, etc. The wastewater CODCr≤200mg / L, the concentration of organic pollutants is low, but it contains certain softening agents and salts; Wastewater separation treatment: high-concentration organic wastewater and low-concentration inorganic wastewater are treated separately. High-concentration organic wastewater is introduced into the high-concentration wastewater treatment system, and low-concentration inorganic wastewater is introduced into the low-concentration wastewater treatment system. Targeted treatment processes are used for separation treatment, which saves floor space, improves treatment efficiency, and reduces operating costs. High-concentration organic wastewater treatment: The high-concentration organic wastewater is sequentially treated by regulating tank pretreatment, anaerobic reaction treatment, MBR treatment, NF treatment, RO treatment and DTRO treatment to finally form treated clean water and membrane concentrate. Among them, the MBR treatment includes two-stage A / O treatment and UF treatment connected in series; Low-concentration inorganic wastewater treatment: low-concentration inorganic wastewater is sequentially processed through regulating tank pretreatment, softening sedimentation treatment, UF treatment and RO treatment to finally form treated clean water and membrane concentrate; Clean water recycling: The treated clean water from high-concentration organic wastewater treatment and low-concentration inorganic wastewater treatment is passed into the circulating water pool for reuse within the factory; Gradient utilization of membrane concentrate: The membrane concentrate formed by low-concentration inorganic wastewater treatment directly enters the lime slurry preparation system for utilization; The membrane concentrate formed by the treatment of high-concentration organic wastewater is first utilized in the fly ash stabilization system, and the remaining part is then utilized in the lime slurry preparation system, and finally the remaining part is processed by the waste incineration synergistic treatment.

[0018] After high-concentration wastewater is treated and reaches the water replenishment standard of open circulating cooling water system in "Water Quality for Industrial Water Use in Urban Wastewater Recycling" (GB / T 19923-2005) and the water quality index of recycled water in "Design Specification for Industrial Circulating Cooling Water Treatment" GB50050-2017), it is reused in the factory, and the reuse unit is the circulating water pool. The membrane concentrate is used in a cascade manner, and is first used for fly ash stabilization and lime slurry preparation, and the rest is treated in coordination with waste incineration.

[0019] The membrane concentrate produced by the DTRO process has high salt content and high content of difficult-to-degrade organic matter. Its components are tested and reused in the fly ash stabilization and lime slurry preparation process first, promoting the solidification and stabilization of heavy metal ions in the fly ash by humus-like substances. For the remaining membrane concentrate that is difficult to reuse, it is used in a cascade manner through coordinated incineration with garbage. It breaks through the drawbacks of traditional concentrate evaporation crystallization or landfill treatment methods, efficiently integrates wastewater treatment with garbage incineration technology, and completely realizes the "reduction + harmlessness" treatment of concentrate. The combustible components in the concentrate (such as residual organic matter) are decomposed and release heat in the incinerator to achieve energy recovery, while reducing the risk of secondary pollution of the concentrate, and reducing the cost per ton of water and treatment fees (less than 1 / 2 and 1 / 10 of traditional leachate treatment technology).

[0020] The low-concentration wastewater with good water quality is first reused in the circulating water pool, such as the first-level reverse osmosis concentrated water in the water treatment workshop, and the rest of the wastewater is sent to the low-concentration wastewater station for treatment. After treatment, the effluent meets the open circulating cooling water system supplementary water standard in "Water Quality for Industrial Water Use in Urban Wastewater Recycling" GB / T19923-2005) and is then reused in the circulating water pool, and the membrane concentrate enters the lime slurry preparation for utilization.

[0021] Preferably, the water purification rate of the high-concentration organic wastewater treatment and the low-concentration inorganic wastewater treatment is not less than 80%, ensuring the water purification rate to meet the use needs of the factory.

[0022] As a more preferred embodiment, the pretreatment in the high-concentration organic wastewater treatment includes the wastewater in the leachate sedimentation tank reaching the regulating tank by overflow, the hydraulic retention time HRT of the regulating tank is 10d, the sludge in the primary sedimentation tank is transported to the sludge concentration tank for collection by a sludge pump, and the wastewater in the regulating tank is anaerobic treated; Anaerobic treatment in high-concentration organic wastewater treatment includes: the wastewater from the equalization tank is transported to the anaerobic tank through the equalization tank lift pump. Through anaerobic reaction, the organic matter in the wastewater is partially degraded to produce biogas, which is collected and utilized. The hydraulic retention time HRT is 12d, the temperature is controlled at 32~38℃, the pH value is controlled in the range of 6.2~7.8, the sludge concentration MLSS is 60g / L, the effluent CODCr≤12320mg / L, BOD5≤7875mg / L, and NH3-N≤2600mg / L.

[0023] As a preferred embodiment 2, the MBR treatment in the high-concentration organic wastewater treatment adopts a split membrane biochemical reactor, including a bioreactor treatment unit containing two-stage A / O treatment and an ultrafiltration treatment unit containing UF treatment. After the ultrafiltration treatment unit separates and purifies the water, the sludge is returned to the bioreactor treatment unit to make the sludge concentration in the bioreactor reach 10~30g / L. The microbial flora formed by continuous domestication can also gradually degrade the difficult-to-biodegrade organic matter in high-concentration wastewater. In order to achieve the purpose of denitrification of wastewater, the nitrified mixed liquid in the nitrification tank is returned to the denitrification tank through the UF system, and the organic carbon in the original wastewater is used as an electron donor for denitrification to reduce NOx--N to nitrogen. The bioreactor process has only one sludge system, the mixed flora is alternately in aerobic and anoxic states, and the organic matter concentration is alternating between high and low conditions, which is conducive to controlling sludge expansion.

[0024] The membrane bioreactor does not use a sedimentation tank for solid-liquid separation, but uses a hollow fiber membrane instead of a sedimentation tank. It has high-efficiency solid-liquid separation performance and uses the characteristics of the membrane to prevent the activated sludge from being lost with the effluent. An ultra-high concentration of activated sludge of 8000~12000mg / L is formed in the biochemical pool, which completely decomposes the pollutants. Therefore, the effluent water quality is good and stable, and the effluent bacteria, suspended solids and turbidity are close to zero. It has advantages in sewage treatment that traditional processes do not have.

[0025] Furthermore, the bioreactor treatment unit includes two parts: a nitrification stage and a pre-denitrification stage. In the nitrification stage, a pipe that passes over the UASB reactor is provided at the outlet pipe of the UASB water inlet pump to directly enter the denitrification tank, so as to avoid excessive degradation of BOD5 in the UASB reactor, resulting in insufficient carbon source for the nitrification / denitrification system. In order to improve the utilization rate of oxygen, microporous aeration and forced oxygen supply are adopted; in the denitrification stage, the ability to reduce nitrate and nitrite to nitrogen is improved by refluxing a large amount of the mixed liquid after nitrification. The reflux ratio of this system is 500-800%, and increasing the reflux ratio is conducive to improving the denitrification effect of the system.

[0026] Specifically, the parameters of the bioreactor treatment unit are: bioreactor system temperature is 28~35°C, pH is 6.5~8.5, sludge concentration is 6~10g / L, dissolved oxygen above the primary A pool is ≤0.5mg / L, dissolved oxygen above the secondary O pool is 2~4mg / L, primary denitrification residence time is 2.9d, and primary nitrification residence time is 7.1d.

[0027] More specifically, the ultrafiltration treatment unit adopts an organic cross-flow tubular membrane with a pore size of 0.02µm and a maximum pressure of 6bar. The parameters of the ultrafiltration treatment unit are: conductivity ≤15000us / cm, CODCr ≤500mg / L, BOD5 ≤80mg / L, SS ≤70mg / L.

[0028] Preferably, the UF system is equipped with a cleaning system, which is flushed after each shutdown of the UF loop to prevent sludge from depositing on the membrane tubes and causing blockage of the membrane tubes; in addition, the UF loop must be chemically cycled and cleaned every 15 days of operation to restore the permeability of the UF membrane.

[0029] The MBR (two-stage A / O + ultrafiltration) combined process treats the anaerobic leachate. This technology is an enhancement of the MBR technology in the treatment of landfill leachate. In addition to the general characteristics of MBR, it also enhances the wastewater treatment effect. Its outstanding features are as follows: (1) Improve the effect of denitrification and removal of organic matter: Set up a bioreactor (two-stage A / O) to achieve nitrification and denitrification in different reaction spaces, so that pollutants such as CODCr, NH3-N, and TN in high-concentration wastewater can be greatly removed. In particular, the degradation of TN eliminates the interference of nitrogen in high-concentration wastewater, so that pollutants such as CODCr and BOD5 in the effluent after treatment by the bioreactor can be more thoroughly removed.

[0030] (2) Reduce membrane system pollution: The ultrafiltration system uses an external tubular membrane, which can extend the membrane service life by more than double while ensuring the removal of high-concentration pollutants in the leachate.

[0031] (3) Enhance the stability and impact resistance of the system: Compared with the single-stage A / O system, the two-stage A / O system has a better buffering effect on fluctuations in water quality and water volume. When the inlet water quality or water volume changes suddenly, the two-stage system can adjust through its own treatment process to reduce the impact on the treatment effect of the entire process. Even if the first-stage treatment system is impacted and its efficiency decreases, the second-stage treatment system can continue to treat some pollutants to ensure the final water quality.

[0032] As a preferred embodiment 3, the DTRO treatment parameters in the treatment of high-concentration organic wastewater are: the inlet pH is 6-6.5, the scale inhibitor is 5-12 PPM per ton of water, and the outlet pressure of the high-pressure pump is controlled at 5.2Mpa; the main control indicators of pure water outlet pH are 6-9, CODCr≤50mg / L, NH3-N≤5mg / L, and total dissolved solids≤1000mg / L. The membrane concentrate produced by reverse osmosis is reduced and further deeply concentrated to increase the reuse rate of the whole plant.

[0033] DTRO treatment control process: The disc-tube reverse osmosis process mainly uses the reverse osmosis membrane and the guide plate to form a trickle flow of the leachate membrane concentrate to be treated, so as to improve the permeation rate of the reverse osmosis system. In the disc-tube assembly, the reverse osmosis process is carried out when the water is in motion. The water flows through the membrane surface. The concentration of the raw water gradually increases when it flows through the assembly. The pollutants are blocked by the membrane to form a concentrate. The concentrate is collected in the final concentrate pool and is recycled according to different paths through the concentrate delivery pump. The generated pure water permeate flows into the clear liquid pool and is transported to the circulating water pool for reuse through the lifting pump.

[0034] DTRO treatment features: (1) It can effectively avoid the membrane clogging problem in traditional osmosis treatment processes, has a significant effect on reducing the amount of membrane concentrate, and can meet the membrane concentrate treatment needs generated in the actual high-concentration wastewater treatment process without the need for special pretreatment.

[0035] (2) The operation in actual application is very simple, the service life of the diaphragm can reach more than 3 years, and the overall system is stable.

[0036] (3) Compared with traditional reverse osmosis systems, this system has a higher concentration multiple and recovery rate, and the effluent quality meets the reuse water standards, with a recovery rate greater than 75%.

[0037] As a preferred embodiment 4, the waste incineration power plant is designed to treat wastewater at a scale of: 600 t / d for a high-concentration wastewater treatment station and 600 t / d for a low-concentration wastewater treatment station.

[0038] 1. Wastewater classification and collection Step 1: The leachate generated by the garbage bin flows into the leachate channel for storage. The stored wastewater, domestic sewage and initial rainwater pool water pass through the self-cleaning filter. After the filter intercepts large particles of impurities, it is pumped to the leachate sedimentation tank.

[0039] Step 2: The sewage from the circulating water pool, the wastewater from the water treatment workshop and the muddy water from the integrated water purifier are pumped through pipes to the low-concentration wastewater treatment regulating tank for mixing.

[0040] 2. Wastewater quality treatment (1) High-concentration wastewater treatment station Step 1: Pretreatment. The wastewater in the leachate sedimentation tank reaches the regulating tank (two) by overflow. The hydraulic retention time HRT of the regulating tank is 10 days, and the effective volume of the pretreatment system is 6000m 3 The sludge in the primary sedimentation tank is transported to the sludge thickening tank for collection through the sludge pump.

[0041] Step 2: Anaerobic treatment. The wastewater from the regulating pool is transported to the anaerobic tank through the regulating pool lifting pump. Through anaerobic reaction, the organic matter in the wastewater is partially degraded and biogas is produced. The biogas is collected and used. The effective volume of the anaerobic tank is 6700m 3 The hydraulic retention time HRT is 12d, the temperature is controlled at 32~38℃, the pH value is controlled in the range of 6.2~7.8, the sludge concentration MLSS is 60g / L, the effluent CODCr≤12320mg / L (COD removal rate 88%), BOD5≤7875mg / L, and NH3-N≤2600mg / L.

[0042] Step 3: Membrane bioreactor treatment. The effluent from the anaerobic pool is transported to the MBR (two-stage denitrification / nitrification + ultrafiltration) system through a lifting pump. First, in the biochemical pool, most of the organic matter in the wastewater is effectively removed through denitrification and nitrification. Then the wastewater is lifted to the pre-filter by the ultrafiltration water inlet pump. The filter pore size is <1mm to prevent particles from entering the ultrafiltration membrane and causing damage to the membrane. The ultrafiltration device has a high efficiency interception effect, and the organic matter and ammonia nitrogen in the wastewater are further removed. In the biochemical pool, the nutrient ratio is adjusted to CODCr:N:P=100:5:1, and the pH is between 7.5 and 8.5. When the sludge is well domesticated and the sludge concentration reaches 3000mg / L, the wastewater can be sent to the ultrafiltration device. The model of the ultrafiltration membrane is a 0.02µm organic cross-flow tubular membrane made of PVDF. The effective volume of the biochemical pool is 9132m 3 (The effective volume of the primary denitrification tank is 2462m 3 The effective volume of the primary nitrification tank is 6670m 3 ), the MLSS range of biochemical pool sludge concentration is 6~10g / L, the hydraulic retention time is 10d (the primary denitrification retention time HRT is 2.9d, the primary nitrification retention time is 7.1d), and the temperature control range is 28-35℃. Ultrafiltration device effluent control parameters: conductivity ≤15000us / cm, CODCr ≤500mg / L, BOD5 ≤80mg / L, SS ≤70mg / L.

[0043] Step 4: Nanofiltration membrane treatment. The ultrafiltration water is transported to the nanofiltration system through a lift pump. In order to ensure that the NF membrane is not blocked by particulate matter and cause a large amount of salt leakage, a bag filter is set at the inlet of the NF membrane, which is a 50μm bag filter and a 5μm bag filter, respectively, and runs in series. NF can remove non-biodegradable organic matter and has a good purification effect on high-valent heavy metal ions, but its limitation is that the membrane pore size is small, which makes it easy to clog and has high requirements for water quality pretreatment. The biochemical degradation and filtration of the improved MBR process in this scheme greatly reduce the organic matter concentration in the wastewater, providing good pre-treatment conditions for NF. This system uses acid to adjust the pH value before the nanofiltration system enters the water, and the pH value is controlled at 6.5~7.0. In order to prevent the NF membrane from being contaminated and scaled by bacteria, bactericides and scale inhibitors are added at the inlet of the NF system. The normal operating pressure of the nanofiltration device is 5~10bar, and the outlet water control parameters are: conductivity ≤5000us / cm, CODCr ≤150mg / L, BOD5 ≤80mg / L, SS=0mg / L.

[0044] Step 5: Reverse osmosis membrane treatment. The nanofiltration water is transported to the reverse osmosis system through a lift pump. In order to ensure that the RO membrane is not blocked by particulate matter and cause a large amount of salt leakage, a 5μm bag filter is installed at the inlet of the RO membrane. The reverse osmosis membrane can remove almost all impurities in the water, with a desalination rate of more than 99%, and the removal rate of COD, ammonia nitrogen and total nitrogen can reach more than 90%, ensuring that the effluent meets the standards and the effluent quality is stable. The system operating pressure is 25~30bar. The clear liquid produced after treatment also meets the water quality standards for supplementary water in the intermediate cold open circulating cooling water system of GB19923-2024 "Water Quality of Industrial Water for Urban Wastewater Recycling" (heat exchanger is non-copper) and the "Pollution Control Standard for Municipal Waste Landfill" (GB16889-2024), which are stricter indicators, and are reused throughout the plant.

[0045] Step 6: Advanced treatment. The concentrate produced by nanofiltration and reverse osmosis treatment enters the chemical softening and disc-tube reverse osmosis system for treatment through the concentrate lift pump.

[0046] Step 7: Odor treatment. During the treatment of landfill leachate, the odor generated by the sewage pool system such as the primary sedimentation tank, regulating tank, denitrification tank and nitrification tank is sent to the leachate channel by the deodorizing fan.

[0047] Step 8: Biogas treatment. The biogas produced by the anaerobic system fermentation is transported through pipelines to the biogas torch for incineration or to the No. 1 furnace for incineration.

[0048] Step 9: Sludge treatment. After the leachate is precipitated, a large amount of inorganic sludge is produced. The inorganic sludge is discharged into the sludge thickening tank through the sludge pump for concentration treatment. The anaerobic system and the aerobic system produce a large amount of activated sludge during the biodegradation process, which is discharged into the thickening tank through the sludge pump. The concentrated sludge is pumped to the sludge dewatering machine for dehydration treatment. After dehydration, the sludge is incinerated in the furnace to avoid secondary pollution. The filtrate produced during the sludge dehydration and separation is discharged to the regulating tank and then enters the leachate treatment system for re-treatment.

[0049] (2) Low-concentration wastewater treatment station Step 1: Pretreatment. After the wastewater passes through the filter to intercept large particles of impurities, it enters the industrial wastewater regulating tank with an effective volume of 600m 3 .

[0050] Step 2: Softening treatment. The wastewater is transported to the #1 reaction zone through the regulating tank lift pump. Sodium carbonate and PAC (flocculant) are added to the #1 reaction zone, and sodium hydroxide and PAM (coagulant aid) are added to the #2 reaction zone. The wastewater in the reaction zone is fully contacted with the reagents and reacts under the stirring action of the mixer. The reaction time is 30 minutes.

[0051] Step 3: Sedimentation treatment. After the wastewater flows through the reaction zone, various suspended matter and sediments gradually settle in the sedimentation tank, and most of the suspended particle impurities in the wastewater are removed. The clear liquid at the top of the sedimentation tank overflows to the clean water area for storage. The sludge at the bottom of the sedimentation tank is transported to the industrial wastewater sludge concentration tank by the sludge pump.

[0052] Step 4: Ultrafiltration membrane treatment. The clean water in the clean water area is transported to the ultrafiltration device through the ultrafiltration inlet pump. The inlet water is first filtered through a security filter with a filter pore size of <1mm. The filtration flux of the ultrafiltration device is controlled at 50L / (m 2 ·h), effluent control parameters: conductivity ≤15000us / cm, CODCr ≤500mg / L, BOD5 ≤80mg / L, SS ≤70mg / L.

[0053] Step 5: Reverse osmosis membrane treatment. The nanofiltration water is transported to the reverse osmosis system through a lift pump. In order to ensure that the RO membrane is not blocked by particulate matter, a 5μm bag filter is installed at the inlet of the RO membrane. For normal operation and a reasonable cleaning cycle, the filtration flux of the reverse osmosis membrane assembly is controlled at 12~16L / (m 2 h), cross-flow arrangement. The clear liquid produced after treatment must meet the water quality standard for supplementary water in the intermediate cooling open circulating cooling water system in GB19923-2024 "Water Quality for Industrial Water Use in Urban Wastewater Recycling" (heat exchanger is non-copper) and the more stringent indicators in the "Pollution Control Standard for Domestic Waste Landfill" (GB16889-2024) for reuse.

[0054] Step 6: Sludge treatment. The sewage from the integrated water purifier is transported to the industrial wastewater sludge concentration tank through the sludge pump, and is treated with chemicals and compressed by the sludge concentrator together with the sludge in the sedimentation tank. The generated sludge is sent to the garbage bin and mixed with the fermented garbage for burning; the generated wastewater is sent to the industrial wastewater regulating tank for further purification.

[0055] 3. Resource Utilization Step 1: The clear liquid produced after DTRO treatment in the high-concentration wastewater treatment station goes to the clear liquid tank and is finally reused in the circulating water tank; the concentrated liquid produced goes to the final concentrated liquid tank and is transported to the fly ash solidification system, lime slurry preparation system or boiler concentrated liquid return system through the concentrated water pump for harmless treatment.

[0056] Step 2: The clear liquid produced by reverse osmosis in the low-concentration wastewater treatment station is transported to the reverse osmosis clear liquid pool for storage, and then transported to the circulating water pool through a clear water pump for recycling. The concentrated water produced by reverse osmosis is transported to the reverse osmosis concentrated liquid pool for storage, and then transported to the lime slurry preparation system through a concentrated water pump for disposal.

[0057] As a preferred embodiment 5, a wastewater coordinated zero-emission system for a domestic waste incineration power plant is used for implementing the above-mentioned wastewater coordinated zero-emission method for a domestic waste incineration power plant, comprising a wastewater classification collection module, a wastewater quality treatment module and a resource utilization module connected in sequence; The wastewater classification and collection module is used to divide the wastewater into high-concentration organic wastewater and low-concentration inorganic wastewater according to CODCr and introduce them into corresponding regulating tanks respectively; The wastewater separation treatment module includes a high-concentration organic wastewater treatment submodule and a low-concentration inorganic wastewater treatment submodule that are independent of each other; The high-concentration organic wastewater treatment submodule comprises a first regulating tank, an anaerobic tank, a membrane bioreactor, a nanofiltration membrane filter, a first reverse osmosis membrane filter and a disc-tube reverse osmosis membrane filter connected in sequence, wherein the membrane bioreactor comprises two-stage A / O tanks and a first ultrafiltration membrane filter connected in series in sequence; The low-concentration inorganic wastewater treatment submodule comprises a second regulating tank, a softening reaction tank, a sedimentation tank, a second ultrafiltration membrane filter and a second reverse osmosis membrane filter which are connected in sequence; The resource utilization module includes a mutually independent clean water recycling submodule and a membrane concentrate gradient utilization submodule. The clean water recycling submodule is used to pass the clean water generated after treatment into a circulating water pool for reuse within the plant, and the membrane concentrate gradient utilization submodule passes the membrane concentrate generated after treatment into a concentrate pool, and transports it in sequence through a concentrate pump in the order of a fly ash stabilization system, a lime slurry preparation system, and a waste incineration boiler concentrate return spray system.

[0058] As a preferred embodiment 6, each device in the high-concentration organic wastewater treatment submodule and the low-concentration inorganic wastewater treatment submodule is provided with sensors and instruments for monitoring corresponding key control parameters, each device corresponds to a PLC controller, the device, the sensors and instruments on the device are electrically connected to the corresponding PLC controller, all PLC controllers are connected to the DCS system in the central control room through wireless communication equipment, and various key control parameters are displayed in the central control room for remote monitoring.

[0059] The monitoring parameters and installation locations are shown in Table 1 and Table 2: Table 1 Monitoring table of high-concentration wastewater treatment station

[0060] Table 2 Monitoring table of low-concentration wastewater treatment station

[0061] The DCS system (distributed control system) is used to remotely control multiple distributed PLC control systems, display the process parameters of the entire plant's wastewater treatment process in real time, and timely grasp and understand the operating status of each process of the sewage plant process, the changes and size of process parameters. At the same time, the on-site equipment can be remotely operated on the system interface according to the actual operating conditions, including the start and stop of pumps, fans and other equipment and the flexible switching to different working states when the on-site switch is switched to automatic, so as to realize the remote reverse control of the control room to the on-site monitoring end, and to deal with emergencies to ensure the treatment effect.

[0062] (1) Data collection and processing In the different process monitoring systems of high-concentration wastewater treatment stations and low-concentration wastewater treatment stations, sensors are installed at key locations to monitor key parameters of sewage in real time, including flow, temperature, pressure, liquid level, pH value, dissolved oxygen (DO), chemical oxygen demand (COD) (mainly CODCr), biological oxygen demand (BOD5), ammonia nitrogen (NH3-N), total phosphorus (TP) and conductivity, etc. Including equipment status signals.

[0063] (2) Data transmission and statistical analysis After the sensor collects and processes the on-site data, the real-time data is sent to the 3G network in the form of IP packets through the 3G communication module, and the Internet is connected through the 3G network. Then the decrypted signal data packet is sent from the Internet to the data processing module, including the central processing unit (CPU) and analysis software. The water quality parameters are analyzed in real time to determine whether the set control standards are met.

[0064] (3) Central Control The control system is connected to each unit equipment through a PLC controller. Based on industrial computers and embedded systems, combined with the mathematical model of wastewater treatment and artificial intelligence algorithms, it executes instructions according to the analyzed data and automatically adjusts the operating parameters of related equipment, such as adjusting the opening of the pump, adjusting the dosage of the agent, controlling the aeration intensity, and adjusting the sludge return rate.

[0065] (4) Communication and remote monitoring Through wireless communication (4G) and wired communication, the system can be interconnected with the central monitoring room and mobile devices (such as mobile phones and tablets). Water quality data and the operating status of the control system can be viewed remotely, and parameters can be adjusted in time when necessary.

[0066] (5) Alarm and emergency response The process and water quality parameters are set in the data program. When abnormal water quality (such as excessive pollutant concentration), temperature, liquid level, dissolved oxygen abnormalities and equipment failure are detected, the on-duty personnel are notified through sound and light alarms. The system automatically starts the emergency processing process and switches to backup equipment, increases the dosage of reagents or increases the aeration volume according to different situations.

[0067] (6) Data storage and reporting The system stores operational data on a local server and generates reports regularly to provide support for operational management improvements.

[0068] (7) Regular maintenance and inspection Regularly maintain and inspect wastewater treatment facilities to ensure the normal operation and treatment effect of the facilities and extend the service life of the facilities.

[0069] Through the above steps, zero wastewater discharge from waste incineration power plants can be achieved, the utilization efficiency of water resources can be improved, and pollution can be reduced.

[0070] This technology is advanced and has broad application prospects in the fields of water pollution control, solid waste treatment and recycling, and energy engineering. In the field of water pollution control, the wastewater from waste incineration power plants can be reused throughout the plant to achieve zero wastewater discharge, which can effectively solve the problems of low wastewater treatment efficiency and failure to fully meet the standards for reused water in existing technologies. It will help achieve efficient recovery of water resources, harmless treatment of pollutants, and continuous protection of the environment, and promote the water treatment industry to develop in a more intelligent, green, and sustainable direction.

[0071] In the field of solid waste treatment and recycling, this technology can reduce the use of fresh water and save water resources by realizing the reuse of wastewater from waste incineration power plants. At the same time, since this technology can achieve the cascade reduction and comprehensive utilization of garbage leachate concentrate, it can improve resource utilization. Wastewater zero discharge technology can not only solve the problem of wastewater pollution, but also promote the efficient disposal and resource utilization of solid waste.

[0072] In the field of energy engineering, this technology can reduce the use of fresh water and energy consumption by reusing treated wastewater. At the same time, since this technology can achieve the coordinated treatment of leachate membrane concentrate and garbage, it can improve the combustion efficiency of garbage incinerators and improve energy utilization. With the growth of energy demand and the promotion of environmental protection policies, the demand for high-efficiency and low-emission technologies in the energy field is increasing. In this context, wastewater zero discharge technology is expected to be widely used to promote the transformation of garbage incineration power plants to a more efficient and greener energy production model. Therefore, this technology has broad application prospects in the field of energy engineering.

Claims

1. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant, characterized in that: The following steps are involved: Wastewater classification and collection: Wastewater is divided into high-concentration organic wastewater and low-concentration inorganic wastewater according to CODCr and collected separately. The high-concentration organic wastewater has a CODCr of 200mg / L<CODCr≤70000mg / L, and the low-concentration inorganic wastewater has a CODCr of ≤200mg / L; Wastewater separation treatment: high-concentration organic wastewater and low-concentration inorganic wastewater are treated separately. High-concentration organic wastewater is passed into the high-concentration wastewater treatment system, and low-concentration inorganic wastewater is passed into the low-concentration wastewater treatment system; High-concentration organic wastewater treatment: The high-concentration organic wastewater is sequentially treated by regulating tank pretreatment, anaerobic reaction treatment, MBR treatment, NF treatment, RO treatment and DTRO treatment to finally form treated clean water and membrane concentrate. Among them, the MBR treatment includes two-stage A / O treatment and UF treatment connected in series; Low-concentration inorganic wastewater treatment: low-concentration inorganic wastewater is sequentially processed through regulating tank pretreatment, softening sedimentation treatment, UF treatment and RO treatment to finally form treated clean water and membrane concentrate; Clean water recycling: The treated clean water formed by high-concentration organic wastewater treatment and low-concentration inorganic wastewater treatment enters the circulating water pool for reuse within the factory; Gradient utilization of membrane concentrate: The membrane concentrate formed by low-concentration inorganic wastewater treatment directly enters the lime slurry preparation system for utilization; The membrane concentrate formed by the treatment of high-concentration organic wastewater is first utilized in the fly ash stabilization system, and the remaining part is then utilized in the lime slurry preparation system, and finally the remaining part is processed by the waste incineration synergistic treatment.

2. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant according to claim 1, characterized in that: The purified water output rates of the high-concentration organic wastewater treatment and the low-concentration inorganic wastewater treatment are both not less than 80%.

3. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant according to claim 2, characterized in that: The pretreatment in the high-concentration organic wastewater treatment includes the wastewater in the leachate sedimentation tank reaching the regulating tank by overflow, the hydraulic retention time HRT of the regulating tank is 10d, the sludge in the primary sedimentation tank is transported to the sludge concentration tank for collection by a sludge pump, and the wastewater in the regulating tank is anaerobic treated; Anaerobic treatment in high-concentration organic wastewater treatment includes: the wastewater from the equalization tank is transported to the anaerobic tank through the equalization tank lift pump. Through anaerobic reaction, the organic matter in the wastewater is partially degraded to produce biogas, which is collected and utilized. The hydraulic retention time HRT is 12d, the temperature is controlled at 32~38℃, the pH value is controlled in the range of 6.2~7.8, the sludge concentration MLSS is 60g / L, the effluent CODCr≤12320mg / L, BOD5≤7875mg / L, and NH3-N≤2600mg / L.

4. A method for coordinated zero discharge of wastewater from a domestic waste incineration power plant according to claim 3, characterized in that: The MBR treatment in the high-concentration organic wastewater treatment adopts a split membrane biochemical reactor, including a bioreactor treatment unit with two-stage A / O treatment and an ultrafiltration treatment unit with UF treatment. After the ultrafiltration treatment unit separates and purifies the water, the sludge is returned to the bioreactor treatment unit to make the sludge concentration in the bioreactor reach 10-30g / L.

5. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant according to claim 4, characterized in that: The bioreactor treatment unit includes two parts: a nitrification stage and a denitrification stage. In the nitrification stage, a pipeline is provided at the outlet pipe of the UASB water inlet pump, which passes through the UASB reactor and directly enters the denitrification tank, so as to avoid excessive degradation of BOD5 in the UASB reactor. In the denitrification stage, the ability to reduce nitrate and nitrite to nitrogen gas is improved by refluxing a large amount of the mixed liquid after nitrification.

6. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant according to claim 5, characterized in that: The parameters of the bioreactor treatment unit are: bioreactor system temperature is 28-35°C, pH is 6.5-8.5, sludge concentration is 6-10g / L, dissolved oxygen above the primary A pool is ≤0.5mg / L, dissolved oxygen above the secondary O pool is 2-4mg / L, primary denitrification residence time is 2.9d, and primary nitrification residence time is 7.1d.

7. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant according to claim 6, characterized in that: The ultrafiltration treatment unit adopts an organic cross-flow tubular membrane with a pore size of 0.02µm and a maximum pressure of 6bar. The parameters of the ultrafiltration treatment unit are: conductivity ≤15000us / cm, CODCr ≤500mg / L, BOD5 ≤80mg / L, SS ≤70mg / L.

8. A method for coordinated zero discharge of wastewater from a municipal solid waste incineration power plant according to claim 7, characterized in that: The DTRO treatment parameters in the treatment of high-concentration organic wastewater are: the inlet pH is 6~6.5, the scale inhibitor is 5~12 PPM per ton of water, and the high-pressure pump outlet pressure is controlled at 5.2Mpa; the main control indicators of pure water outlet are pH 6~9, CODCr≤50mg / L, NH3-N≤5mg / L, and total dissolved solids≤1000mg / L.

9. A wastewater coordinated zero-discharge system for a municipal solid waste incineration power plant, characterized in that: Used for implementing a coordinated zero-emission method for wastewater from a domestic waste incineration power plant as claimed in claim 8, comprising a wastewater classification collection module, a wastewater quality treatment module and a resource utilization module connected in sequence; The wastewater classification and collection module is used to divide the wastewater into high-concentration organic wastewater and low-concentration inorganic wastewater according to CODCr and introduce them into corresponding regulating tanks respectively; The wastewater separation treatment module includes a high-concentration organic wastewater treatment submodule and a low-concentration inorganic wastewater treatment submodule that are independent of each other; The high-concentration organic wastewater treatment submodule comprises a first regulating tank, an anaerobic tank, a membrane bioreactor, a nanofiltration membrane filter, a first reverse osmosis membrane filter and a disc-tube reverse osmosis membrane filter connected in sequence, wherein the membrane bioreactor comprises two-stage A / O tanks and a first ultrafiltration membrane filter connected in series in sequence; The low-concentration inorganic wastewater treatment submodule comprises a second regulating tank, a softening reaction tank, a sedimentation tank, a second ultrafiltration membrane filter and a second reverse osmosis membrane filter which are connected in sequence; The resource utilization module includes a mutually independent clean water recycling submodule and a membrane concentrate gradient utilization submodule. The clean water recycling submodule is used to pass the clean water generated after treatment into a circulating water pool for reuse within the plant, and the membrane concentrate gradient utilization submodule passes the membrane concentrate generated after treatment into a concentrate pool, and transports it in sequence through a concentrate pump in the order of a fly ash stabilization system, a lime slurry preparation system, and a waste incineration boiler concentrate return spray system.

10. A wastewater coordinated zero-discharge system for a municipal solid waste incineration power plant according to claim 9, characterized in that: Each device in the high-concentration organic wastewater treatment submodule and the low-concentration inorganic wastewater treatment submodule is equipped with sensors and instruments for monitoring corresponding key control parameters. Each device corresponds to a PLC controller. The device, the sensors and instruments on the device are electrically connected to the corresponding PLC controller. All PLC controllers are connected to the DCS system in the central control room through wireless communication equipment, and various key control parameters are displayed in the central control room to remotely operate the on-site equipment and monitor the working conditions in real time.

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