Harmless treatment method of high-pollution-factor mixed inorganic waste liquid

Abstract

The invention discloses a harmless treatment method for high-pollution-factor mixed inorganic waste liquid, and relates to the technical field of wastewater treatment, and the harmless treatment method comprises the following steps: S1, electrolyzing landfill leachate, S2, preliminarily precipitating the waste liquid, S3, decomposing organic matters in the waste liquid, S4, secondarily decomposing the organic matters, S5, mixing domestic sewage, and S6, discharging to reach the water quality. According to the invention, the mixed liquid obtained by compatibility of dangerous waste acid and waste alkali needing to be treated, the landfill leachate and the domestic sewage are collected and treated in a grading manner, so that the removal rate of COD, ammonia nitrogen and heavy metals in the mixed inorganic waste liquid is high, and the problem of treatment of the high-pollution-factor inorganic waste liquid is solved; in the treatment process, waste acid and waste alkali are fully utilized, the adding amount of a large amount of acid and alkali agents is saved, coupling treatment of the landfill leachate and the domestic sewage is achieved, the biodegradability of waste liquid is greatly improved, the wastewater treatment efficiency is improved, and the method is low in operation cost and capable of being used continuously.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a harmless disposal method for high-polluting factor mixed inorganic waste liquid. Background Art

[0002] As waste-producing units in various fields continue to strengthen the refined management of hazardous wastes, the composition of waste liquids disposed by hazardous waste disposal units is becoming more and more complex. The waste liquid shows the characteristics of high organic matter and high ammonia nitrogen, and needs to be systematically treated. The invention patent with publication number CN115367903A discloses "a waste liquid treatment equipment and a waste liquid treatment method, wherein the waste liquid treatment equipment includes: a waste liquid storage unit, a waste liquid treatment unit, a waste liquid conveying unit and a central controller. The waste liquid storage unit is connected to the waste liquid treatment unit through a pipeline provided with a control valve, and the waste liquid stored in the waste liquid storage unit is transmitted to the waste liquid treatment unit via a pipeline, and the waste liquid conveying unit is used to transmit the waste liquid in different waste liquid treatment units. The waste liquid treatment unit performs waste liquid treatment on the waste liquid. The central controller is respectively connected to the waste liquid storage unit, the waste liquid treatment unit and the waste liquid conveying unit, and is used to control the treatment process of the waste liquid. The above-mentioned waste liquid treatment equipment and method have the function of automatically treating the waste liquid generated in the laboratory."

[0003] The above-mentioned existing technology solves the problem of environmental pollution caused by the inability to treat waste liquid in a timely manner. However, during implementation, due to the lack of graded treatment, the system cannot completely solve the disposal problem of inorganic waste liquid with high pollution factors, and cannot be integrated with domestic sewage for treatment during the waste liquid treatment process. The method of treating waste liquid is relatively single. In actual application, this method reduces the efficiency of wastewater treatment and increases operating costs. Summary of the invention

[0004] The purpose of the present invention is to provide a method for harmlessly disposing mixed inorganic waste liquid with high pollution factors, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for harmlessly disposing high-pollution-factor mixed inorganic waste liquid, comprising the following steps: S1. Electrolysis of landfill leachate: The landfill leachate is collected and stored in a waste liquid collection tank, and the waste acid and waste alkali are mixed with the landfill leachate according to a set ratio. The obtained waste liquid is placed in a homogenizing tank through a lifting pump, and then input into a primary iron-carbon electrolysis reaction system after homogenization; S2, preliminary precipitation of waste liquid: the homogenized waste liquid enters the primary iron-carbon electrolysis reaction system, the aeration device in the iron-carbon electrolysis reactor is turned on, the homogenized waste liquid undergoes an oxidation-reduction reaction with the iron-carbon material in the reactor, the reacted waste liquid flows into the delayed aeration neutralization tank, the divalent iron in the water is completely oxidized to trivalent iron, the waste liquid in the neutralization tank flows by gravity into the mixed flocculation reactor, after sufficient reaction, a larger flocculent group is formed, which flows by gravity into the sedimentation tank, the waste liquid is precipitated by gravity, and the filtrate obtained after precipitation enters the post-filtration liquid tank; S3, decomposition of organic matter in waste liquid: after homogenizing and equalizing the filtrate in the filtered liquid pool, the filtrate is sent to the primary multi-media filter tank through a lift pump, and the waste liquid after backwashing treatment in the tank is transferred to the primary ozone oxidation reactor, and ozone and ozone catalyst are added to the reactor to decompose macromolecular organic matter through ozone oxidation reaction to reduce COD and ammonia nitrogen in the waste liquid; S4, secondary decomposition of organic matter: the waste liquid after the ozone oxidation reaction enters the pH regulating water tank, the water quality and water volume are balanced, and the waste liquid is sent to the secondary iron-carbon electrolysis reaction system through the lifting pump, and then passes through the iron-carbon electrolysis reactor, the neutralization coagulation flocculation precipitation reaction tank and the secondary ozone oxidation reactor in sequence. The waste liquid after sufficient reaction enters the secondary ozone production tank, and the waste liquid treated in the secondary ozone production tank is sent to the homogenization tank, and after adding the landfill leachate and balancing the water quality and water volume, it is sent to the evaporation system; S5. Mixed treatment of domestic sewage: After the waste liquid with landfill leachate is added into the evaporation system, the generated condensate enters the condensate pool. After the water quality and quantity are balanced, the waste liquid is sent to the three-stage ozone oxidation reactor through a lifting pump. After sufficient reaction, it is input into the homogenization tank. After the waste liquid and domestic sewage are fully mixed, it is sent to the anaerobic tank through a lifting pump. After anaerobic reaction, it is sent to the anoxic tank and the aerobic tank in turn. After the denitrifying bacteria in the anoxic tank degrade the nitrate nitrogen in the waste liquid, the activated sludge in the aerobic tank performs aerobic biochemical treatment on the waste liquid. After sufficient reaction, it is sent to the MBR membrane system through a lifting pump. S6. Discharge water that meets the quality standards: The mixed waste liquid after aerobic biochemical treatment enters the MBR membrane system and produces water through a self-priming pump. The mixed waste liquid enters the four-stage ozone oxidation reactor from the bottom. After sufficient reaction, it flows by gravity into the reuse water pool. The water is discharged after meeting the quality standards. The physical and chemical sludge and residual sludge generated during the reaction are regularly discharged to the sludge pool.

[0006] Preferably, the step S1 specifically includes the following steps: S101, collecting and storing the landfill leachate in a waste liquid collection tank, and adjusting the water quality and water volume in the waste liquid collection tank according to the specification of processing 20 cubic meters per day; S102, after the waste acid, waste alkali and landfill leachate are mixed in a set ratio, they are placed in a homogenizing tank through a lifting pump, the pH value of the waste liquid after homogenization is controlled within a range of 2 to 3, and the waste liquid is sent into a primary iron-carbon electrolysis reaction system through a lifting pump; S103, after receiving the waste liquid by the iron-carbon electrolysis reactor, the corresponding amount of iron-carbon material is calculated according to the amount of waste liquid, and the iron-carbon material is added into the reactor according to the specified amount of material.

[0007] Preferably, the step S2 specifically includes the following steps: S201, turning on the aeration device in the reactor, causing the waste liquid to undergo an oxidation-reduction reaction with the iron-carbon material in the reactor, and the macromolecular organic matter is oxidized and decomposed into small molecular substances; S202, the reacted substances flow into the delayed aeration neutralization tank, and sodium hydroxide solution is added to adjust the pH to between 8 and 9, and then aeration and stirring are performed to completely oxidize the divalent iron in the water into trivalent iron, and after forming ferric hydroxide, it is allowed to flow by gravity into the mixed flocculation reactor; S203, adding a coagulant and a flocculant into the mixed flocculation reactor and stirring continuously, wherein the dosage range of the coagulant is 100 to 200 mg / L, and the dosage range of the flocculant is 5 to 10 mg / L, and after sufficient reaction, a larger flocculent group is formed, which flows into the sedimentation tank by itself; S204, the waste liquid is precipitated by gravity, and the precipitated sludge at the bottom is pumped into the plate filter press through the sludge feed pump, and the filter press is used to separate the mud and water, and the filtrate enters the post-filtration liquid pool.

[0008] Preferably, the step S3 specifically includes the following steps: S301, after the filtrate is homogenized and equalized in the pool, it is sent to the primary multi-media filter tank through a lift pump, filtered through the quartz sand in the tank, and suspended matter is intercepted; S302, using the backwash system in the primary multi-media filter tank to perform backwashing according to the pressure indication and the actual water output, and the resulting waste liquid enters the primary ozone oxidation reactor from the bottom; S303, adding ozone and ozone catalyst into the reactor, wherein the amount of ozone added is 400 mg / L, decomposing macromolecular organic matter through ozone oxidation reaction, and reducing COD and ammonia nitrogen in waste liquid.

[0009] Preferably, the step S4 specifically includes the following steps: S401, receiving the waste liquid after the ozone oxidation reaction into the pH adjustment water tank, adding hydrochloric acid to control the pH value within the range of 2 to 3, and balancing the water quality and water quantity; S402, after the waste liquid with balanced water quality and water quantity is sent to the secondary iron-carbon electrolysis reaction system through a lifting pump, it passes through the iron-carbon electrolysis reactor and the neutralization coagulation flocculation sedimentation reaction tank in sequence, and then the waste liquid is transferred to the secondary ozone oxidation reactor. After sufficient reaction, the waste liquid enters the secondary ozone water production tank; S403, the waste liquid in the secondary ozone water production tank is sent to the homogenization tank through a lifting pump, and after adding the landfill leachate and balancing the water quality and water quantity, the waste liquid with the landfill leachate is sent to the evaporation system.

[0010] Preferably, the step S5 specifically includes the following steps: S501. After the waste liquid with landfill leachate is added into the evaporation system, the generated condensate enters the condensate pool, the evaporated mother liquid is returned to the homogenization pool, the water is transported into the condensate pool, and after the water quality and quantity are balanced, it is sent into the three-stage ozone oxidation reactor through the lifting pump to remove COD and ammonia nitrogen in the condensate by ozone oxidation; S502, input the waste liquid into the homogenization tank, fully mix it with domestic sewage, balance the water quality and quantity, and then send it into the anaerobic tank through the lifting pump. After the anaerobic reaction, the total nitrogen index of the liquid is reduced, and COD is removed at the same time. The treated waste liquid is sent into the anoxic tank through the lifting pump. The denitrifying bacteria in the anoxic tank degrade the nitrate nitrogen in the waste liquid, reduce the total nitrogen index, and remove COD at the same time. After sufficient reaction, it enters the aerobic tank.

[0011] Preferably, the step S5 specifically further comprises the following steps: S503. The activated sludge in the aerobic tank performs aerobic biochemical treatment on the waste liquid to reduce the concentration of organic matter. When the organic matter content is lower than the threshold, the ammonia nitrogen in the water is converted into nitrate nitrogen, thereby reducing the ammonia nitrogen content. The mixed waste liquid after sufficient reaction is sent into the MBR membrane system through the lifting pump.

[0012] Preferably, the step S6 specifically includes the following steps: S601. The mixed waste liquid after aerobic biochemical treatment enters the MBR membrane system and produces water through a self-priming pump. The remaining effluent is refluxed with the intercepted activated sludge. While denitrification is being carried out, the concentration of the front-end activated sludge is supplemented. The mixed waste liquid enters the four-stage ozone oxidation reactor from the bottom and fully contacts with the filler from bottom to top. The effective combination of ozone and ozone catalyst is used to further reduce the COD and ammonia nitrogen pollutant indicators in the mixed waste liquid, and effectively disinfect and decolorize. S602. After sufficient reaction, the mixed waste liquid in the four-stage ozone oxidation reactor flows by gravity into the reuse water pool. The water in the pool is discharged after reaching the standard. The physical and chemical sludge and residual sludge produced during the reaction process are regularly discharged into the sludge pool and properly disposed of after filter pressing and dehydration. The filtered liquid produced by filter pressing and dehydration flows back to the homogenization tank.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention collects the mixed liquid, garbage leachate and domestic sewage after the hazardous waste acid and alkali to be disposed of after being mixed, and treats them in a graded manner, so that the removal rates of COD, ammonia nitrogen and heavy metals in the mixed inorganic waste liquid are high, which is beneficial to solving the disposal problem of inorganic waste liquid with high pollution factors, and in the disposal process, not only the waste acid and waste alkali are fully utilized, and a large amount of acid and alkali reagents are saved, but also the coupled treatment of garbage leachate and domestic sewage is realized, the biodegradability of the waste liquid is greatly improved, and the efficiency of wastewater treatment is improved. The method has low operating cost, can be used continuously, generates little pollution, reduces the occupation and pollution of land by waste liquid, reduces the consumption of raw material resources, and promotes the sustainable development of the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Provide an overall method flow chart for an embodiment of the present invention; Figure 2 A flow chart of a method for electrolyzing landfill leachate provided in an embodiment of the present invention; Figure 3 A flow chart of a method for preliminary precipitation of waste liquid provided in an embodiment of the present invention; Figure 4 A flow chart of a method for decomposing organic matter in waste liquid provided by an embodiment of the present invention; Figure 5 A flow chart of a method for secondary decomposition of organic matter provided by an embodiment of the present invention; Figure 6 A flow chart of a method for mixed treatment of domestic sewage provided by an embodiment of the present invention; Figure 7 A specific flow chart provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1-Figure 7 The present invention provides a technical solution: a method for harmlessly disposing high-pollution-factor mixed inorganic waste liquid, comprising the following steps: S1. Electrolysis of landfill leachate: The landfill leachate is collected and stored in a waste liquid collection tank, and the waste acid and waste alkali are mixed with the landfill leachate according to a set ratio. The obtained waste liquid is placed in a homogenizing tank through a lifting pump, and then input into a primary iron-carbon electrolysis reaction system after homogenization; S2, preliminary precipitation of waste liquid: the homogenized waste liquid enters the primary iron-carbon electrolysis reaction system, the aeration device in the iron-carbon electrolysis reactor is turned on, the homogenized waste liquid undergoes an oxidation-reduction reaction with the iron-carbon material in the reactor, the reacted waste liquid flows into the delayed aeration neutralization tank, the divalent iron in the water is completely oxidized to trivalent iron, the waste liquid in the neutralization tank flows by gravity into the mixed flocculation reactor, after sufficient reaction, a larger flocculent group is formed, which flows by gravity into the sedimentation tank, the waste liquid is precipitated by gravity, and the filtrate obtained after precipitation enters the post-filtration liquid tank; S3, decomposition of organic matter in waste liquid: after homogenizing and equalizing the filtrate in the filtered liquid pool, the filtrate is sent to the primary multi-media filter tank through a lift pump, and the waste liquid after backwashing treatment in the tank is transferred to the primary ozone oxidation reactor, and ozone and ozone catalyst are added to the reactor to decompose macromolecular organic matter through ozone oxidation reaction to reduce COD and ammonia nitrogen in the waste liquid; S4, secondary decomposition of organic matter: the waste liquid after the ozone oxidation reaction enters the pH regulating water tank, the water quality and water volume are balanced, and the waste liquid is sent to the secondary iron-carbon electrolysis reaction system through the lifting pump, and then passes through the iron-carbon electrolysis reactor, the neutralization coagulation flocculation precipitation reaction tank and the secondary ozone oxidation reactor in sequence. The waste liquid after sufficient reaction enters the secondary ozone production tank, and the waste liquid treated in the secondary ozone production tank is sent to the homogenization tank, and after adding the landfill leachate and balancing the water quality and water volume, it is sent to the evaporation system; S5. Mixed treatment of domestic sewage: After the waste liquid with landfill leachate is added into the evaporation system, the generated condensate enters the condensate pool. After the water quality and quantity are balanced, the waste liquid is sent to the three-stage ozone oxidation reactor through a lifting pump. After sufficient reaction, it is input into the homogenization tank. After the waste liquid and domestic sewage are fully mixed, it is sent to the anaerobic tank through a lifting pump. After anaerobic reaction, it is sent to the anoxic tank and the aerobic tank in turn. After the denitrifying bacteria in the anoxic tank degrade the nitrate nitrogen in the waste liquid, the activated sludge in the aerobic tank performs aerobic biochemical treatment on the waste liquid. After sufficient reaction, it is sent to the MBR membrane system through a lifting pump. S6. Discharge water that meets the quality standards: The mixed waste liquid after aerobic biochemical treatment enters the MBR membrane system and produces water through a self-priming pump. The mixed waste liquid enters the four-stage ozone oxidation reactor from the bottom. After sufficient reaction, it flows by gravity into the reuse water pool. The water is discharged after meeting the quality standards. The physical and chemical sludge and residual sludge generated during the reaction are regularly discharged to the sludge pool.

[0017] Step S1 specifically includes the following steps: S101, collecting and storing the landfill leachate in a waste liquid collection tank, and adjusting the water quality and water volume in the waste liquid collection tank according to the specification of processing 20 cubic meters per day; S102, after the waste acid, waste alkali and landfill leachate are mixed in a set ratio, they are placed in a homogenizing tank through a lifting pump, the pH value of the waste liquid after homogenization is controlled within a range of 2 to 3, and the waste liquid is sent into a primary iron-carbon electrolysis reaction system through a lifting pump; S103, after receiving the waste liquid by the iron-carbon electrolysis reactor, the corresponding amount of iron-carbon material is calculated according to the amount of waste liquid, and the iron-carbon material is put into the reactor according to the specified amount of material; Step S2 specifically includes the following steps: S201, turning on the aeration device in the reactor, causing the waste liquid to undergo an oxidation-reduction reaction with the iron-carbon material in the reactor, and the macromolecular organic matter is oxidized and decomposed into small molecular substances; S202, the reacted substances flow into the delayed aeration neutralization tank, and sodium hydroxide solution is added to adjust the pH to between 8 and 9, and then aeration and stirring are performed to completely oxidize the divalent iron in the water into trivalent iron, and after forming ferric hydroxide, it is allowed to flow by gravity into the mixed flocculation reactor; S203, adding a coagulant and a flocculant into the mixed flocculation reactor and stirring continuously, wherein the dosage range of the coagulant is 100 to 200 mg / L, and the dosage range of the flocculant is 5 to 10 mg / L, and after sufficient reaction, a larger flocculent group is formed, which flows into the sedimentation tank by itself; S204, the waste liquid is precipitated by gravity, and the precipitated sludge at the bottom is sent to the plate filter press by the sludge feed pump, and the filter press is used to separate the mud and water, and the filtrate enters the post-filtration liquid pool, and the sludge is centrally treated; Step S3 specifically includes the following steps: S301, after the filtered liquid is homogenized and equalized in the pool, it is sent to the primary multi-media filter tank through a lift pump, filtered through the quartz sand in the tank, and suspended matter is intercepted; S302, using the backwash system in the primary multi-media filter tank to perform backwashing according to the pressure indication and the actual water output, and the resulting waste liquid enters the primary ozone oxidation reactor from the bottom; S303, adding ozone and ozone catalyst into the reactor, wherein the amount of ozone added is 400 mg / L, decomposing macromolecular organic matter through ozone oxidation reaction, and reducing COD and ammonia nitrogen in waste liquid; Step S4 specifically includes the following steps: S401, receiving the waste liquid after the ozone oxidation reaction into the pH adjustment water tank, adding hydrochloric acid to control the pH value within the range of 2 to 3, and balancing the water quality and water quantity; S402, after the waste liquid with balanced water quality and water quantity is sent to the secondary iron-carbon electrolysis reaction system through a lifting pump, it passes through the iron-carbon electrolysis reactor and the neutralization coagulation flocculation sedimentation reaction tank in sequence, and then the waste liquid is transferred to the secondary ozone oxidation reactor. After sufficient reaction, the waste liquid enters the secondary ozone water production tank; S403, the waste liquid in the secondary ozone water production tank is sent to the homogenization tank through a lifting pump, after adding the landfill leachate and balancing the water quality and water quantity, 0.2 kg to 0.3 kg of acid is added per ton of water to control the pH value within the range of 6 to 6.5, and the treated waste liquid is sent to the evaporation system; Step S5 specifically includes the following steps: S501. After the waste liquid with landfill leachate is added into the evaporation system, the generated condensate enters the condensate water pool, the evaporated mother liquid is returned to the homogenization pool, the water is transported into the condensate water pool, and after the water quality and quantity are balanced, it is sent into the three-stage ozone oxidation reactor through the lifting pump, and the COD and ammonia nitrogen in the condensate are removed by ozone oxidation to improve its biodegradability; S502, the waste liquid is input into the homogenization tank, fully mixed with domestic sewage, and after the water quality and water volume are balanced, it is sent to the anaerobic tank through the lifting pump. The anaerobic tank can effectively reduce the organic load in the wastewater, and can also reduce the concentration of nutrients such as nitrogen and phosphorus in the wastewater. At the same time, the facultative anaerobic part in the anaerobic tank can undergo hydrolysis reaction to improve biodegradability. After the anaerobic reaction, the treated waste liquid is sent to the anoxic tank through the lifting pump, and the denitrifying bacteria in the anoxic tank are used to degrade the nitrate nitrogen in the waste liquid. The dissolved oxygen in the anoxic tank is controlled between 0.2-0.5 mg / L, which mainly plays the role of denitrification to remove nitrate nitrogen, reduce the total nitrogen index, and remove part of COD. After sufficient reaction, it enters the aerobic tank; Step S5 specifically also includes the following steps: S503, the activated sludge in the aerobic tank performs aerobic biochemical treatment on the waste liquid to reduce the concentration of organic matter. When the organic matter content is lower than the threshold, the ammonia nitrogen in the water is converted into nitrate nitrogen, thereby reducing the ammonia nitrogen content. The mixed waste liquid after sufficient reaction is sent into the MBR membrane system through the lifting pump; Step S6 specifically includes the following steps: S601. The mixed waste liquid after aerobic biochemical treatment enters the MBR membrane system and produces water through a self-priming pump. The remaining effluent is refluxed with the intercepted activated sludge. While denitrification is being carried out, the concentration of the front-end activated sludge is supplemented. The mixed waste liquid enters the four-stage ozone oxidation reactor from the bottom and fully contacts with the filler from bottom to top. The effective combination of ozone and ozone catalyst is used to further reduce the COD and ammonia nitrogen pollutant indicators in the mixed waste liquid, and effectively disinfect and decolorize. S602. After sufficient reaction, the mixed waste liquid in the four-stage ozone oxidation reactor flows by gravity into the reuse water pool. The water in the pool is discharged after reaching the standard. The physical and chemical sludge and residual sludge produced during the reaction process are regularly discharged into the sludge pool and properly disposed of after filter pressing and dehydration. The filtered liquid produced by filter pressing and dehydration flows back to the homogenization tank.

[0018] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for harmless disposal of high-pollution mixed inorganic waste liquid, characterized in that: The method comprises the following steps: S1. Electrolysis of landfill leachate: The landfill leachate is collected and stored in a waste liquid collection tank, and the waste acid and waste alkali are mixed with the landfill leachate according to a set ratio. The obtained waste liquid is placed in a homogenizing tank through a lifting pump, and then input into a primary iron-carbon electrolysis reaction system after homogenization; S2, preliminary precipitation of waste liquid: the homogenized waste liquid enters the primary iron-carbon electrolysis reaction system, the aeration device in the iron-carbon electrolysis reactor is turned on, the homogenized waste liquid undergoes an oxidation-reduction reaction with the iron-carbon material in the reactor, the reacted waste liquid flows into the delayed aeration neutralization tank, the divalent iron in the water is completely oxidized to trivalent iron, the waste liquid in the neutralization tank flows by gravity into the mixed flocculation reactor, after sufficient reaction, a larger flocculent group is formed, which flows by gravity into the sedimentation tank, the waste liquid is precipitated by gravity, and the filtrate obtained after precipitation enters the post-filtration liquid tank; S3, decomposition of organic matter in waste liquid: after homogenizing and equalizing the filtrate in the post-filtration liquid pool, the filtrate is sent to the primary multi-media filter tank through a lift pump, and the waste liquid after backwashing treatment in the tank is transferred to the primary ozone oxidation reactor, and ozone and ozone catalyst are added to the reactor to decompose macromolecular organic matter through ozone oxidation reaction to reduce COD and ammonia nitrogen in the waste liquid; S4, secondary decomposition of organic matter: the waste liquid after the ozone oxidation reaction enters the pH regulating water tank, the water quality and water volume are balanced, and the waste liquid is sent to the secondary iron-carbon electrolysis reaction system through the lifting pump, and then passes through the iron-carbon electrolysis reactor, the neutralization coagulation flocculation precipitation reaction tank and the secondary ozone oxidation reactor in sequence. The waste liquid after sufficient reaction enters the secondary ozone production tank, and the waste liquid treated in the secondary ozone production tank is sent to the homogenization tank, and after adding the landfill leachate and balancing the water quality and water volume, it is sent to the evaporation system; S5. Mixed treatment of domestic sewage: After the waste liquid with landfill leachate is added into the evaporation system, the generated condensate enters the condensate pool. After the water quality and quantity are balanced, the waste liquid is sent to the three-stage ozone oxidation reactor through a lifting pump. After sufficient reaction, it is input into the homogenization tank. After the waste liquid and domestic sewage are fully mixed, it is sent to the anaerobic tank through a lifting pump. After anaerobic reaction, it is sent to the anoxic tank and the aerobic tank in turn. After the denitrifying bacteria in the anoxic tank degrade the nitrate nitrogen in the waste liquid, the activated sludge in the aerobic tank performs aerobic biochemical treatment on the waste liquid. After sufficient reaction, it is sent to the MBR membrane system through a lifting pump. S6. Discharge water that meets the quality standards: The mixed waste liquid after aerobic biochemical treatment enters the MBR membrane system and produces water through a self-priming pump. The mixed waste liquid enters the four-stage ozone oxidation reactor from the bottom. After sufficient reaction, it flows by gravity into the reuse water pool. The water is discharged after meeting the quality standards. The physical and chemical sludge and residual sludge generated during the reaction are regularly discharged to the sludge pool.

2. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 1 is characterized in that: The step S1 specifically includes the following steps: S101, collecting and storing the landfill leachate in a waste liquid collection tank, and adjusting the water quality and water volume in the waste liquid collection tank according to the set specifications; S102, after the waste acid, waste alkali and landfill leachate are mixed in a set ratio, they are placed in a homogenizing tank through a lifting pump, the pH range of the waste liquid after homogenization is controlled within a specified range, and the waste liquid is sent to a primary iron-carbon electrolysis reaction system through a lifting pump; S103, after receiving the waste liquid by the iron-carbon electrolysis reactor, the corresponding amount of iron-carbon material is calculated according to the amount of waste liquid, and the iron-carbon material is added into the reactor according to the specified amount of material.

3. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 1 is characterized in that: The step S2 specifically includes the following steps: S201, turning on the aeration device in the reactor, causing the waste liquid to undergo an oxidation-reduction reaction with the iron-carbon material in the reactor, and the macromolecular organic matter is oxidized and decomposed into small molecular substances; S202, the reacted substances flow into the delayed aeration neutralization tank, and sodium hydroxide solution is added to adjust the pH value within the specified range, and then aeration and stirring are performed to completely oxidize the divalent iron in the water into trivalent iron, and after forming ferric hydroxide, it is allowed to flow into the mixed flocculation reactor by gravity; S203, adding coagulant and flocculant into the mixed flocculation reactor and stirring continuously, forming larger flocculent groups after sufficient reaction, and making them flow into the sedimentation tank by gravity; S204, the waste liquid is precipitated by gravity, and the precipitated sludge at the bottom is pumped into the plate filter press through the sludge feed pump, and the filter press is used to separate the mud and water, and the filtrate enters the post-filtration liquid pool.

4. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 1 is characterized in that: The step S3 specifically comprises the following steps: S301, after the filtrate is homogenized and equalized in the pool, it is sent to the primary multi-media filter tank through a lift pump, filtered through the quartz sand in the tank, and suspended matter is intercepted; S302, using the backwash system in the primary multi-media filter tank to perform backwashing according to the pressure indication and the actual water output, and the resulting waste liquid enters the primary ozone oxidation reactor from the bottom; S303, adding ozone and ozone catalyst into the reactor, wherein the amount of ozone added is 400 mg / L, decomposing macromolecular organic matter through ozone oxidation reaction, and reducing COD and ammonia nitrogen in waste liquid.

5. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 1 is characterized in that: The step S4 specifically comprises the following steps: S401, receiving the waste liquid after the ozone oxidation reaction into the pH adjustment water tank, adding hydrochloric acid to control the pH within a specified range, and balancing the water quality and water quantity; S402, after the waste liquid with balanced water quality and water quantity is sent to the secondary iron-carbon electrolysis reaction system through a lifting pump, it passes through the iron-carbon electrolysis reactor and the neutralization coagulation flocculation sedimentation reaction tank in sequence, and then the waste liquid is transferred to the secondary ozone oxidation reactor. After sufficient reaction, the waste liquid enters the secondary ozone water production tank; S403, the waste liquid in the secondary ozone water production tank is sent to the homogenization tank through a lifting pump, and after adding the landfill leachate and balancing the water quality and water quantity, the waste liquid with the landfill leachate is sent to the evaporation system.

6. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 1 is characterized by: The step S5 specifically comprises the following steps: S501. After the waste liquid with landfill leachate is added into the evaporation system, the generated condensate enters the condensate pool, the evaporated mother liquid is returned to the homogenization pool, the water is transported into the condensate pool, and after the water quality and quantity are balanced, it is sent into the three-stage ozone oxidation reactor through the lifting pump to remove COD and ammonia nitrogen in the condensate by ozone oxidation; S502, input the waste liquid into the homogenization tank, fully mix it with domestic sewage, balance the water quality and quantity, and then send it into the anaerobic tank through the lifting pump. After the anaerobic reaction, the total nitrogen index of the liquid is reduced, and COD is removed at the same time. The treated waste liquid is sent into the anoxic tank through the lifting pump. The denitrifying bacteria in the anoxic tank degrade the nitrate nitrogen in the waste liquid, reduce the total nitrogen index, and remove COD at the same time. After sufficient reaction, it enters the aerobic tank.

7. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 6 is characterized by: The step S5 specifically further comprises the following steps: S503. The activated sludge in the aerobic tank performs aerobic biochemical treatment on the waste liquid to reduce the concentration of organic matter. When the organic matter content is lower than the threshold, the ammonia nitrogen in the water is converted into nitrate nitrogen, thereby reducing the ammonia nitrogen content. The mixed waste liquid after sufficient reaction is sent into the MBR membrane system through the lifting pump.

8. The harmless disposal method of a high-polluting factor mixed inorganic waste liquid according to claim 1 is characterized by: The step S6 specifically comprises the following steps: S601. The mixed waste liquid after aerobic biochemical treatment enters the MBR membrane system and produces water through a self-priming pump. The remaining effluent is refluxed with the intercepted activated sludge. While denitrification is being carried out, the concentration of the front-end activated sludge is supplemented. The mixed waste liquid enters the four-stage ozone oxidation reactor from the bottom and fully contacts with the filler from bottom to top. The effective combination of ozone and ozone catalyst is used to further reduce the COD and ammonia nitrogen pollutant indicators in the mixed waste liquid, and effectively disinfect and decolorize. S602. After sufficient reaction, the mixed waste liquid in the four-stage ozone oxidation reactor flows by gravity into the reuse water pool. The water in the pool is discharged after reaching the standard. The physical and chemical sludge and residual sludge produced during the reaction process are regularly discharged into the sludge pool and properly disposed of after filter pressing and dehydration. The filtered liquid produced by filter pressing and dehydration flows back to the homogenization tank.

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