High-salt organic wastewater zero-discharge treatment device for hazardous waste treatment plant

Abstract

The utility model discloses a high-salinity organic wastewater zero discharge treatment device for a hazardous waste treatment plant, which relates to the technical field of high-salinity organic wastewater treatment and comprises a chemical hardness removal device for reducing the hardness of wastewater, and a water outlet of the chemical hardness removal device is communicated with an MVR (mechanical vapor recompression) evaporative crystallization device. When the device is used, the hardness of the high-salinity wastewater is firstly improved through the arranged chemical hardness removal device, and then the salt in the water is evaporated, concentrated, crystallized and separated through the MVR evaporative crystallization device, so that solid carnallite is formed and discharged out of the water body; distilled water generated by evaporation is deeply desalted through the integrated biological sewage treatment device and the membrane treatment device, so that the wastewater can reach the factory recycling standard, and the purified wastewater can be recycled in a production process, thereby achieving the purpose of zero-discharge treatment of high-salt and high-organic wastewater in a hazardous waste treatment plant. The leakage of the wastewater in the process of being discharged towards a municipal sewage treatment plant is effectively avoided, and the ecological environment is ensured not to be polluted by the high-salinity wastewater.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial wastewater treatment technical field especially relates to a kind of high-salt organic wastewater zero discharge treatment device of hazardous waste treatment plant. BACKGROUND

[0002] The hazardous waste category of the National Hazardous Waste List includes medical waste, waste medicine, pharmaceutical waste, pesticide waste, waste mineral oil, oil / water, hydrocarbon / water, distillation residue, dye, coating waste, organic resin waste, surface treatment waste, copper-containing waste, organic halide-containing waste, nickel-containing waste, organic solvent waste, waste acid, waste alkali and other waste.

[0003] Different disposal processes are used for different types of waste in hazardous waste treatment plants, for example:

[0004] Industrial sludge: collection-storage-drum drying reduction-transportation;

[0005] Silicone residue: collection-storage-resting-silicone oil recovery-leaching-filtration-extraction-electrolysis-metal products, filter residue-silicon powder, carbon powder recovery-drying-transportation;

[0006] Waste iron drum: collection-washing-sand blasting-paint spraying-regenerated iron drum or collection-cutting-soaking-melting-iron block sale;

[0007] Waste plastic: collection-cutting-washing-melting-regenerated granulation-sale.

[0008] During the treatment of hazardous waste, high-salt, high-organic waste water containing a large amount of heavy metal ions is generated, which is difficult to treat. If it is directly discharged, it will cause serious pollution to the environment and water bodies. At present, most of the hazardous waste treatment wastewater treatment methods are simple coagulation sedimentation primary treatment, and are discharged to municipal sewage treatment plants. This method has certain problems and may cause new pollution. UTILITY MODEL CONTENT

[0009] The utility model aims at providing a kind of high-salt organic wastewater zero discharge treatment device of hazardous waste treatment plant to solve the problems raised in the above background.

[0010] To achieve the above object, the utility model provides the following technical scheme: a kind of high-salt organic wastewater zero discharge treatment device of hazardous waste treatment plant, including the chemical hardness removal device for reducing wastewater hardness and sludge treatment device, the outlet of the chemical hardness removal device is communicated with MVR evaporation crystallization device, the outlet of the MVR evaporation crystallization device is communicated with integrated sewage biological treatment device, the outlet of the integrated sewage biological treatment device is communicated with membrane treatment device, the sludge discharge port of the chemical hardness removal device and the sludge discharge port of integrated sewage biological treatment device are all communicated with sludge treatment device;

[0011] The MVR evaporation crystallization device is used for evaporating and concentrating the salt in water to form solid impurities and distill water.

[0012] The integrated biological wastewater treatment device is used for further purifying the distill water produced by the MVR evaporation crystallization device.

[0013] The membrane treatment device is used for filtering and separating the supernatant produced by the integrated biological wastewater treatment device.

[0014] The sludge treatment device is used for dewatering and drying the sludge produced in the wastewater treatment.

[0015] Preferably, the chemical hardness removal device comprises a first lifting pump, wastewater is sucked into the first lifting pump through the water inlet of the first lifting pump, the water outlet of the first lifting pump is connected with a sequencing batch reactor, the water outlet of the sequencing batch reactor is connected with a hardness removal tank, the chemical hardness removal device further comprises a sodium hydroxide dosing device, a soda ash dosing device, a coagulant dosing device, a coagulant aid dosing device and a heavy metal capture agent dosing device for adding sodium hydroxide, soda ash, coagulant, coagulant aid and heavy metal capture agent into the sequencing batch reactor respectively, and the chemical hardness removal device further comprises an acid dosing device, and the drug outlet of the acid dosing device is connected to the water outlet pipe of the sequencing batch reactor.

[0016] Preferably, the MVR evaporation crystallization device comprises a first water inlet booster pump, the water inlet of the first water inlet booster pump is connected with the water outlet of the hardness removal tank, the water outlet of the first water inlet booster pump is connected with a preheating device, the water outlet of the preheating device is connected with a forced circulation pump for pressurizing wastewater, the water outlet of the forced circulation pump is connected with a forced circulation evaporator, the discharge outlet of the forced circulation evaporator is connected with a separator, the water outlet of the separator is connected with a centrifuge, the salt components in the wastewater discharged from the separator are separated out through the centrifugation operation of the centrifuge, and the water outlet of the centrifuge is used for discharging the wastewater remaining after the centrifugation.

[0017] Preferably, the preheating device comprises a first-stage preheater and a second-stage preheater, the water inlet of the first-stage preheater is connected to the water inlet of the first water inlet booster pump, the water outlet of the first-stage preheater is connected to the water inlet of the second-stage preheater, the water outlet of the second-stage preheater is connected to the water inlet of the forced circulation pump, the heat medium of the first-stage preheater is distilled water, the heat medium of the second-stage preheater is low-pressure saturated steam, the steam inlet of the second-stage preheater is connected to the external steam pipe, the steam outlet of the separator is connected to the secondary steam compressor, the steam outlet of the secondary steam compressor is connected to the steam inlet of the forced circulation evaporator, the secondary steam compressed by the secondary steam compressor enters the forced circulation evaporator as the heat medium, the preheating device further comprises a distilled water tank, the distilled water formed by steam heat exchange in the first-stage preheater and the distilled water condensed by secondary steam heat exchange in the forced circulation evaporator are both transported to the distilled water tank through the water outlet, the water inlet of the distilled water tank is connected to the distilled water pump, the distilled water pump can pressurize the distilled water, and the water outlet of the distilled water pump is connected to the heat medium inlet of the first-stage preheater.

[0018] Preferably, the MVR evaporation crystallization device further comprises a mother liquor tank, the water inlet of the mother liquor tank is connected to the water outlet of the centrifuge, and the water outlet of the mother liquor tank is connected to the mother liquor pump, and the water outlet of the mother liquor pump is connected to the feed inlet of the separator.

[0019] Preferably, the MVR evaporation crystallization device further comprises a vacuum pump, the suction port of the vacuum pump is connected to the condenser, and the air inlet of the condenser is connected to the forced circulation evaporator.

[0020] Preferably, the integrated sewage biological treatment device comprises a cooler, the water inlet of the cooler is connected to the water outlet of the forced circulation evaporator, the water outlet of the cooler is connected to the water inlet of the water inlet pool, the water inlet pool is provided with a biochemical lifting pump, the water outlet of the biochemical lifting pump is connected to the anoxic tank, the integrated sewage biological treatment device further comprises an aerobic tank, the wastewater in the anoxic tank is pumped into the aerobic tank by the biochemical lifting pump arranged in the anoxic tank, the aerobic tank is connected to the secondary sedimentation tank, the secondary sedimentation tank is connected to the inclined tube sedimentation tank, the water outlet of the inclined tube sedimentation tank is connected to the clear water tank, the sludge discharge port of the inclined tube sedimentation tank is connected to the sludge concentration tank, the supernatant water outlet of the sludge concentration tank is connected to the supernatant tank, the supernatant tank is provided with a supernatant pump, the liquid outlet of the supernatant pump is connected to the water inlet pool, and the sludge concentration pump is arranged at the bottom of the sludge concentration tank, and the sludge discharge port of the sludge concentration pump is connected to the sludge treatment device.

[0021] Preferably, the membrane treatment device comprises a pre-filtering device, the water inlet of the pre-filtering device is communicated with the clean water tank, the pre-filtering device is used for removing impurities such as suspended solids, colloids, microorganisms and bacteria in the wastewater, the water outlet of the pre-filtering device is communicated with an ultrafiltration water production tank, the ultrafiltration water production tank is communicated with a reverse osmosis booster pump, the reverse osmosis booster pump is communicated with a security filter, the water outlet of the security filter is communicated with a reverse osmosis high-pressure pump, the water outlet of the reverse osmosis high-pressure pump is communicated with a reverse osmosis circulating pump, the reverse osmosis circulating pump is communicated with a reverse osmosis device, the water outlet of the reverse osmosis device is communicated with a reverse osmosis water production tank, the reverse osmosis water production tank is provided with a reverse osmosis water pump, the water outlet of the reverse osmosis water pump is communicated with a factory area water reuse point, and the concentrated liquid outlet of the reverse osmosis device is communicated with the sewage adjusting tank.

[0022] Preferably, the membrane treatment device further comprises a reducing agent dosing device, a scale inhibitor dosing device and a non-oxidizing bactericide dosing device which are communicated with the inlet pipe of the security filter.

[0023] Preferably, the sludge treatment device comprises a sludge tank, the sludge tank is provided with a sludge pump, the sludge outlet of the sludge pump is communicated with a plate-and-frame filter press, the water outlet of the plate-and-frame filter press is communicated with a press water pump, the water outlet of the press water pump is communicated with a press water tank, a belt conveyor is connected to the dewatered sludge discharge outlet of the plate-and-frame filter press, and the belt conveyor is communicated with a dewatered sludge storage tank.

[0024] In conclusion, the technical effects and advantages of the utility model are as follows:

[0025] In the utility model, the hardness of high-salinity wastewater is first removed by the chemical hardness removal device, then the salt in the water is evaporated, concentrated and crystallized by the MVR evaporation crystallization device, and the solid impure salt is discharged from the water body, and the distilled water generated by evaporation is subjected to deep desalination by the integrated sewage biological treatment device and the membrane treatment device to reach the factory area water reuse standard, so that the purified wastewater can be reused in the production process, thereby achieving the purpose of zero discharge of high-salinity and high-organic wastewater in the hazardous waste treatment plant, effectively avoiding leakage of the wastewater in the process of discharging to the municipal sewage treatment plant, and ensuring that the ecological environment is not polluted by the high-salinity wastewater.

[0026] In the utility model, the membrane treatment device is provided, the membrane treatment device comprises a pre-filtering device, the pre-filtering device can effectively remove suspended solids, colloids, microorganisms and bacteria in the water, so that the reverse osmosis membrane is not impacted by large particle impurities in the filtering process, the service life of the reverse osmosis membrane is prolonged, and the reliability and practicability of the treatment device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0028] Figure 1 It is a schematic diagram of the overall structure of the zero-emission treatment device for high-salt organic wastewater in a hazardous waste treatment plant according to an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the chemical hardness removal device according to an embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the structure of the MVR evaporation crystallization device according to an embodiment of the present application.

[0031] Figure 4 It is a schematic diagram of the structure of the integrated biological wastewater treatment device according to an embodiment of the present application.

[0032] Figure 5 It is a schematic diagram of the structure of the membrane treatment device according to an embodiment of the present application.

[0033] Figure 6 It is a schematic diagram of the structure of the sludge treatment device according to an embodiment of the present application.

[0034] Figure 7 It is a wastewater treatment flowchart of the zero-emission treatment device for high-salt organic wastewater in a hazardous waste treatment plant according to an embodiment of the present application.

[0035] In the figure: 1, sewage conditioning tank; 2, chemical hardness removal device; 21, first lifting pump; 22, sequencing batch reactor; 23, hardness removal tank; 241, caustic soda dosing device; 242, soda ash dosing device; 243, heavy metal capture agent dosing device; 244, coagulant dosing device; 245, coagulant aid dosing device; 246, acid dosing device; 3, MVR evaporation crystallization device; 31, first water inlet booster pump; 33, forced circulation pump; 34, forced circulation evaporator; 35, separator; 351, discharge pump; 36, centrifuge; 37, first-stage preheater; 38, second-stage preheater; 39, secondary steam compressor; 310, distilled water tank; 311, distilled water pump; 312, mother liquor tank; 313, mother liquor pump; 314, vacuum pump; 315, condenser; 4, integrated sewage biological treatment device; 41, cooler; 42, water inlet tank; 43, biochemical lifting pump; 44, anoxic tank; 45, aerobic tank; 451, nitrification liquid reflux pump; 452, fan; 46, secondary sedimentation tank; 47, inclined tube sedimentation tank; 48, clean water tank; 49, sludge thickening tank; 410, supernatant tank; 411, sludge thickening pump; 412, supernatant pump; 413, carbon source adding device; 414, alkali adding device; 415, coagulant dosing device; 5, membrane treatment device; 52, ultrafiltration water tank; 53, reverse osmosis booster pump; 54, security filter; 55, reverse osmosis high-pressure pump; 56, reverse osmosis circulating pump; 57, reverse osmosis device; 58, reverse osmosis water tank; 581, second water inlet booster pump; 582, ultrafiltration backwash pump; 59, reverse osmosis water pump; 5101, reducing agent dosing device; 5102, scale inhibitor dosing device; 5103, non-oxidizing bactericide dosing device; 511, quartz sand filter; 512, bag filter; 513, ultrafiltration device; 6, sludge treatment device; 62, sludge pump; 63, plate-and-frame filter press; 64, press water pump; 641, press water tank; 65, belt conveyor; 66, dewatered sludge storage tank. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Please refer to Figures 1-7The device for zero discharge of high-salt organic wastewater in a hazardous waste treatment plant includes a chemical hardness removal device 2 for reducing the hardness of wastewater and a sludge treatment device 6, the effluent outlet of the chemical hardness removal device 2 is connected to an MVR evaporation crystallization device 3, the effluent outlet of the MVR evaporation crystallization device 3 is connected to an integrated sewage biological treatment device 4, the effluent outlet of the integrated sewage biological treatment device 4 is connected to a membrane treatment device 5, and the sludge discharge outlet of the chemical hardness removal device 2 and the sludge discharge outlet of the integrated sewage biological treatment device 4 are both connected to the sludge treatment device 6. When treating high-salt organic wastewater generated during the hazardous waste treatment process, the wastewater is first discharged through a pipeline or a ditch to a sewage adjusting tank 1, the wastewater in the sewage adjusting tank 1 is lifted to the chemical hardness removal device 2 by a first lifting pump 21, the chemical sludge generated by the chemical hardness removal device 2 is discharged to the sludge treatment device 6, and after dewatering, it is transported to the hazardous waste treatment plant for treatment, the sludge filtrate returns to the sewage adjusting tank 1, the effluent of the chemical hardness removal device 2 enters the MVR evaporation crystallization device 3, the solid impure salt generated is sent to the hazardous waste treatment plant, the distilled water is cooled by a cooler 41 and then sent to the integrated sewage biological treatment device 4, the COD is reduced by biochemical treatment, the effluent of the integrated sewage biological treatment device 4 enters the membrane treatment device 5, the produced reverse osmosis desalinated water is sent to the hazardous waste treatment plant workshop for reuse as process water, the reverse osmosis concentrated liquid returns to the sewage adjusting tank 1 to re-enter the system for the next round of treatment. The whole process realizes zero discharge of wastewater during the hazardous waste treatment process, and achieves the effects of environmental protection and energy saving.

[0038] Reference Figure 2The chemical hardness removal device 2 comprises a first lifting pump 21, sewage is sucked into the first lifting pump 21 through the water inlet of the first lifting pump 21, the water outlet of the first lifting pump 21 is communicated with a sequencing batch reactor 22, the water outlet of the sequencing batch reactor 22 is communicated with a hardness removal tank 23, the chemical hardness removal device 2 further comprises a sodium hydroxide dosing device 241, a soda ash dosing device 242, a coagulant dosing device 243, a coagulant aid dosing device 244 and a heavy metal capture agent dosing device 245 for adding sodium hydroxide, soda ash, coagulant, coagulant aid and heavy metal capture agent into the sequencing batch reactor 22 respectively, which can effectively remove calcium, magnesium and other hardness substances in water to soften the water quality; the chemical hardness removal device 2 further comprises an acid adding device 246, which can further reduce the hardness of water by adding acidic agents. Such design not only can effectively remove the hardness substances in water, but also can prevent the occurrence of high water hardness in the subsequent wastewater treatment process, thereby improving the efficiency and stability of the entire treatment system, and the medicine outlet of the acid adding device 246 is connected to the water outlet pipe of the sequencing batch reactor 22. In the device, high-salt organic wastewater generated in the hazardous waste treatment process is discharged to the sewage conditioning tank 1 through a pipeline or a ditch, is lifted to the sequencing batch reactor 22 through the first lifting pump 21, the sodium hydroxide dosing device 241, the soda ash dosing device 242, the heavy metal capture agent dosing device 243, the coagulant dosing device 244 and the coagulant aid dosing device 245 are started during the water inlet process, and sodium hydroxide, soda ash, heavy metal capture agent, coagulant and coagulant aid are added respectively, and the stirrer is started for sufficient reaction, after the full liquid level of the sequencing batch reactor 22, the first lifting pump 21 and the metering pumps of each dosing device are stopped, the stirring is continued for 15-30 min, then the stirrer is stopped, and the water valve is opened, and the acid adding device 246 is started, the clear water after hardness removal is discharged to the hardness removal tank 23, the acid adding amount is controlled to maintain the PH value at 7-7.5, after the drainage is completed, the water valve is closed, the acid metering pump is stopped, then the sludge valve at the bottom of the sequencing batch reactor 22 is opened, and the chemical sludge is discharged to the sludge tank of the sludge treatment device 6. Through the above series of treatment steps, the hardness substances in the wastewater can be effectively removed, and deep treatment can be carried out to achieve the effect of softening the water quality.

[0039] Reference Figure 3, MVR evaporation crystallization device 3, the MVR evaporation crystallization device 3 includes first water inlet booster pump 31, the water inlet of first water inlet booster pump 31 is connected with the water outlet of hard water tank 23, the water outlet of first water inlet booster pump 31 is communicated with preheating device, preheating device water outlet is communicated with the forced circulation pump 33 for pressurizing waste water, the water outlet of forced circulation pump 33 is communicated with forced circulation evaporator 34, the discharge port of forced circulation evaporator 34 is communicated with separator 35, the water outlet of separator 35 is communicated with centrifuge 36, the salt component in the waste water discharged by separator 35 is separated out by centrifugal operation of centrifuge 36, and the water outlet of centrifuge 36 is used to discharge the waste water remaining after centrifugal separation;

[0040] The preheating device includes primary preheater 37 and secondary preheater 38, the water inlet of primary preheater 37 is communicated with the water inlet of first water inlet booster pump 31, the water outlet of primary preheater 37 and the water inlet of secondary preheater 38 are communicated, the water outlet of secondary preheater 38 is communicated with the water inlet of forced circulation pump 33, the heat medium of primary preheater 37 uses distilled water, the heat medium of secondary preheater 38 uses low-pressure saturated steam, the steam inlet of secondary preheater 38 is communicated with external steam pipe, the steam outlet of separator 35 is communicated with secondary steam compressor 39, the steam outlet of secondary steam compressor 39 is communicated with the steam inlet of forced circulation evaporator 34, and the secondary steam compressed by secondary steam compressor 39 enters forced circulation evaporator 34 as heat medium;

[0041] The preheating device further includes distilled water tank 310, the distilled water formed after steam heat exchange in primary preheater 37 and the distilled water condensed after secondary steam heat exchange in forced circulation evaporator 34 are both transported into distilled water tank 310 through the water outlet, the water inlet of distilled water tank 310 is communicated with distilled water pump 311, the distilled water pump 311 can pressurize distilled water, and the water outlet of distilled water pump 311 is communicated with the heat medium feeding port of primary preheater 37.

[0042] The MVR evaporation crystallization device 3 further includes mother liquor tank 312, the water inlet of mother liquor tank 312 is communicated with the water outlet of centrifuge 36, the water outlet of mother liquor tank 312 is communicated with mother liquor pump 313, the water outlet of mother liquor pump 313 is communicated with the feeding port of separator 35, and the mother liquor pump 313 can pressurize the mother liquor discharged by centrifuge 36.

[0043] In the device, the hard water after pressurization enters the first preheater 37, the first preheater 37 adopts a plate heat exchanger, and the heat medium of the first preheater 37 adopts distilled water. The hard water after the first preheater 37 enters the second preheater 38, the second preheater 38 adopts a shell-and-tube heat exchanger, and the heat medium of the second preheater 38 adopts low-pressure saturated steam. The steam outlet is connected with the external steam pipe. After heat exchange, the steam is liquefied into distilled water and discharged to the distilled water tank 310. The water outlet of the second preheater 38 and part of the water outlet of the separator 35 enter the inlet pipe of the forced circulation pump 33 together, are pressurized, and then enter the forced circulation evaporator 34. The forced circulation evaporator 34 adopts a shell-and-tube heat exchanger, and the heat medium of the forced circulation evaporator 34 adopts secondary steam compressed by the secondary steam compressor 39 to increase the heat content. The water after heat exchange in the forced circulation evaporator 34 reaches the boiling point temperature, enters the separator 35, and the secondary steam is discharged from the separator 35. The water solution is concentrated, and the secondary steam is connected with the inlet of the secondary steam compressor 39.

[0044] During the operation of the forced circulation evaporator 34, the vacuum pump 314 continuously operates to maintain a negative pressure state in the evaporation device to reduce the boiling point of the water solution. The inlet pipe of the vacuum pump 314 is provided with a condenser 315, the condenser 315 adopts a shell-and-tube heat exchanger, and the cold medium adopts plant circulating cooling water to cool the extracted small amount of steam into condensed water.

[0045] When the concentration of the water solution in the separator 35 reaches the supersaturation state, it is discharged by the discharge pump 351 to the centrifuge 36. The solid salt produced by the centrifuge 36 is collected and sent to a hazardous waste treatment plant for treatment. The mother liquor discharged from the centrifuge 36 enters the mother liquor tank 312, is pressurized by the mother liquor pump 313, and then returns to the separator 35. The compressed secondary steam is liquefied into distilled water after heat exchange in the forced circulation evaporator 34, is discharged to the distilled water tank 310, is pressurized by the distilled water pump 311, enters the first preheater 37, and is discharged from the evaporation device after heat exchange, and enters the cooler 41 and the water inlet tank 42 of the integrated sewage biological treatment device 4.

[0046] Through the above treatment, the salt and other solid impurities in the wastewater can be effectively separated.

[0047] Reference Figure 4The integrated sewage biological treatment device 4 comprises a cooler 41, a water inlet of the cooler 41 being communicated with a water outlet of the forced circulation evaporator 34, a water outlet of the cooler 41 being communicated with a water inlet pool 42, a biochemical lifting pump 43 being arranged in the water inlet pool 42, a water outlet of the biochemical lifting pump 43 being communicated with an anoxic pool 44, the integrated sewage biological treatment device 4 further comprising an aerobic pool 45, wastewater in the anoxic pool 44 being sent into the aerobic pool 45 by the biochemical lifting pump 43 arranged in the anoxic pool 44, the aerobic pool 45 being communicated with a secondary sedimentation tank 46, the secondary sedimentation tank 46 being communicated with an inclined tube sedimentation tank 47, a water outlet of the inclined tube sedimentation tank 47 being communicated with a clear water pool 48, a sludge discharge port of the inclined tube sedimentation tank 47 being communicated with a sludge concentration pool 49, a supernatant water outlet of the sludge concentration pool 49 being communicated with a supernatant pool 410, a supernatant pump 412 being arranged in the supernatant pool 410, a liquid outlet of the supernatant pump 412 being communicated with the water inlet pool 42, a sludge concentration pump 411 being arranged at the bottom of the sludge concentration pool 49, a sludge discharge port of the sludge concentration pump 411 being communicated with a sludge treatment device 6.

[0048] The water outlet of the aerobic pool 45 is self-flowing into the secondary sedimentation tank 46, the secondary sedimentation tank 46 is a vertical flow type sedimentation tank, the water outlet of the secondary sedimentation tank 46 is self-flowing into the inclined tube sedimentation tank 47, the water outlet of the inclined tube sedimentation tank 47 is self-flowing into the clear water pool 48, a coagulant is added at the water inlet of the secondary sedimentation tank 46 to improve the sedimentation effect, the secondary sedimentation tank 46 and the inclined tube sedimentation tank 47 regularly discharge the biochemical sludge to the sludge concentration pool 49, the supernatant of the sludge concentration pool 49 is discharged to the supernatant pool 410, and is lifted to the water inlet pool 42 by the supernatant pump 412 for recycling, and the concentrated biochemical sludge at the bottom of the sludge concentration pool 49 is sent to the sludge treatment device 6 by the sludge concentration pump 411.

[0049] Reference Figure 5The membrane treatment device 5 includes a pre-filtering device, the water inlet of the pre-filtering device is connected with the clean water tank 48, the pre-filtering device is used for removing impurities such as suspended solids, colloids, microorganisms and bacteria in the wastewater, the water outlet of the pre-filtering device is connected with an ultrafiltration water tank 52, the ultrafiltration water tank 52 is connected with a reverse osmosis booster pump 53, the reverse osmosis booster pump 53 is connected with a security filter 54, the water outlet of the security filter 54 is connected with a reverse osmosis high-pressure pump 55, the water outlet of the reverse osmosis high-pressure pump 55 is connected with a reverse osmosis circulating pump 56, the reverse osmosis circulating pump 56 is connected with a reverse osmosis device 57, the water outlet of the reverse osmosis device 57 is connected with a reverse osmosis water tank 58, the reverse osmosis water tank 58 is provided with a reverse osmosis water pump 59, the water outlet of the reverse osmosis water pump 59 is connected with a factory area water reuse point, and the concentrated liquid outlet of the reverse osmosis device 57 is connected with the sewage conditioning tank 1.

[0050] The membrane treatment device 5 further includes a reducing agent dosing device 5101, a scale inhibitor dosing device 5102 and a non-oxidizing bactericide dosing device 5103 connected with the inlet pipe of the security filter 54.

[0051] The second water inlet booster pump 581 is connected with the outlet of the clean water tank 48 of the integrated sewage biological treatment device 4, and pressurizes the water into the quartz sand filter 511, the bag filter 512 and the ultrafiltration device 513. The ultrafiltration membrane has a filtering precision of 30 nm, and can effectively remove suspended solids, colloids, microorganisms and bacteria in the water, thereby protecting the reverse osmosis membrane. The quartz sand filter 511 and the bag filter 512 are used for filtering large-particle suspended solids and colloids in the water, thereby protecting the ultrafiltration membrane. The water produced by the ultrafiltration device 513 enters the ultrafiltration water tank 52, is pressurized by the reverse osmosis booster pump 53, enters the security filter 54, the reverse osmosis high-pressure pump 55, the reverse osmosis circulating pump 56 and the reverse osmosis device 57, and the reverse osmosis product water enters the reverse osmosis water tank 58 and is sent to the factory area water reuse point by the reverse osmosis water pump 59.

[0052] The reverse osmosis concentrated liquid returns to the sewage conditioning tank 1. The reducing agent dosing device 5101, the scale inhibitor dosing device 5102 and the non-oxidizing bactericide dosing device 5103 are started during the operation of the reverse osmosis device 57, and relevant agents are added.

[0053] The quartz sand filter 511 and the ultrafiltration device 513 need to be regularly backwashed by the ultrafiltration backwashing water pump 582. The reverse osmosis device 57 needs to be low-pressure flushed when starting or stopping. The backwashing and flushing wastewater is discharged into the sludge concentration tank 49 of the integrated sewage biological treatment device 4 through a ditch.

[0054] Reference Figure 6The sludge treatment device 6 includes a sludge tank, a sludge pump 62 is arranged in the sludge tank, a plate-and-frame filter press 63 is communicated with the sludge outlet of the sludge pump 62, a press water pump 64 is communicated with the water outlet of the plate-and-frame filter press 63, a press water tank 641 is communicated with the water outlet of the press water pump 64, a belt conveyor 65 is connected to the dewatered sludge discharge outlet of the plate-and-frame filter press 63, and a dewatered sludge storage tank 66 is communicated with the belt conveyor 65. The chemical sludge discharged by the sequencing batch reactor 22 of the chemical hardening removal device 2 and the concentrated biochemical sludge discharged by the sludge concentration tank 49 of the integrated sewage biological treatment device 4 are received by the sludge tank, are sent to the plate-and-frame filter press 63 after being pressurized by the sludge pump 62, become sludge cakes after being dewatered and dried, and are unloaded to the dewatered sludge storage tank 66 through the belt conveyor 65 after the water content of the sludge cakes is less than 70%, are transported to a hazardous waste treatment plant, the filtered water of the plate-and-frame filter press 63 is discharged to the sewage adjusting tank 1 for recycling, and water is used for pressing through the press water tank 641 and the press water pump 64.

[0055] Treatment process flow:

[0056] The high-salt organic wastewater generated in the hazardous waste treatment process is discharged to the sewage adjusting tank 1 through a pipeline or a ditch, is lifted to the sequencing batch reactor 22 through the first lifting pump 21, and the following steps are performed: in the water inlet process, the reagents such as caustic soda, soda ash, heavy metal capturing agent, coagulant and coagulant aid are added, and the stirrer is started to fully react; after the sequencing batch reactor 22 is full, the first lifting pump 21 and the various dosing pumps are stopped, the stirring is continued for 15-30 min, then the stirrer is stopped, and the water valve is opened and the acid adding device 246 is started after 30-60 min of standing and precipitation, so that the water after hardening removal is discharged to the hardening removal water tank, the amount of acid added is controlled to maintain the PH value at 7-7.5, after the drainage is completed, the water valve is closed, and the acid adding device 246 is stopped; then the sludge discharge valve at the bottom of the sequencing batch reactor 22 is opened, and the chemical sludge is discharged to the sludge tank of the sludge treatment device 6;

[0057] Except the outlet of hard water pool 23 is connected with the inlet of first water inlet booster pump 31, and after being boosted, it enters the first preheater 37. The first preheater 37 adopts plate heat exchanger, and the heat medium adopts distilled water. The outlet water of the first preheater 37 enters the second preheater 38, which adopts tube-shell heat exchanger, and the heat medium adopts low-pressure saturated steam. The steam inlet is connected with the external steam pipe. After heat exchange, the steam is liquefied into distilled water and discharged to the distilled water tank 310. The outlet water of the second preheater 38 and part of the outlet water of the separator 35 enter the inlet pipe of the forced circulation pump 33 together, and after being boosted, they enter the forced circulation evaporator 34. The forced circulation evaporator 34 adopts tube-shell heat exchanger, and the heat medium adopts secondary steam compressed by the secondary steam compressor 39 to improve the heat content. The water after heat exchange in the forced circulation evaporator 34 reaches the boiling point temperature, enters the separator 35, and the secondary steam is discharged from the separator 35, and the water solution is concentrated. The secondary steam is connected with the inlet of the secondary steam compressor 39. During the working process of the MVR evaporation crystallization device 3, the vacuum pump 314 continuously operates to keep the MVR evaporation crystallization device 3 in a negative pressure state to reduce the boiling point of the water solution. The inlet pipe of the vacuum pump 314 is provided with a condenser 315, which adopts tube-shell heat exchanger, and the cold medium adopts plant circulating cooling water to cool the extracted small amount of steam into condensed water. When the concentration of the water solution in the separator 35 reaches the supersaturated state, it is discharged by the discharge pump 351 to the centrifuge 36 for dehydration. The solid impurity salt produced by the centrifuge 36 contains a high content of organic matter, which is collected and sent to a hazardous waste treatment plant for treatment. The mother liquor discharged from the centrifuge enters the mother liquor tank 312, is boosted by the mother liquor pump 313, and then returns to the separator 35. The secondary steam after compression is liquefied into distilled water after heat exchange in the forced circulation evaporator 34, and is discharged to the distilled water tank 310. The distilled water is boosted by the distilled water pump 311, enters the first preheater 37, is heat exchanged, and is discharged from the MVR evaporation crystallization device 3, enters the cooler 41 in the integrated sewage biological treatment device 4, and the distilled water quality is TDS~1000mg / L, CODCr~500mg / L, and PH 7~8.

[0058] The distilled water cooled by cooler 41 enters the water inlet pool 42, and is lifted to the anoxic pool 44 and the aerobic pool 45 by the biochemical lifting pump 43. The anoxic pool 44 and the aerobic pool 45 adopt the biological contact oxidation method, and the filler adopts the suspended filler. The sewage is in full contact with the biological membrane on the surface of the filler, and the COD, ammonia nitrogen and the like in the sewage are removed through the biological degradation. An aeration device is arranged at the bottom of the aerobic pool, and the aeration is performed by the fan 452 to aerate and oxygenate. According to the water quality of the inlet water / produced water, carbon source and alkali are added. During the operation, the nitrification liquid reflux pump 451 is started to circulate part of the sewage in the aerobic pool 45 to the anoxic pool 44, so as to improve the removal rate of total nitrogen and COD. The outlet water of the aerobic pool 45 flows into the secondary sedimentation tank 46 by itself. The secondary sedimentation tank 46 adopts the vertical flow type sedimentation tank. The outlet water of the secondary sedimentation tank 46 flows into the inclined pipe sedimentation tank 47 by itself. The outlet water of the inclined pipe sedimentation tank 47 flows into the clear water pool 48 by itself. The coagulant is added at the inlet of the secondary sedimentation tank 46 to improve the sedimentation effect. The secondary sedimentation tank 46 and the inclined pipe sedimentation tank 47 regularly discharge the biochemical sludge to the sludge thickening tank 49. The supernatant of the sludge thickening tank 49 is discharged to the supernatant pool 410, and is lifted to the water inlet pool 42 by the supernatant pump 412 for recycling. The concentrated biochemical sludge at the bottom of the sludge thickening tank 49 is sent to the sludge treatment device 6 by the concentrated sludge pump 411. After the biochemical treatment, the water quality is as follows: TDS is about 1000 mg / L, CODCr is less than 50 mg / L, and PH is 7-8.

[0059] The outlet of the clear water pool 48 of the integrated sewage biological treatment device 4 is connected with the inlet of the second water inlet booster pump 581. After being pressurized, the water enters the quartz sand filter 511, the bag filter 512 and the ultrafiltration device 513. The ultrafiltration membrane has a filtration precision of 30 nm, and can effectively remove the suspended matter, colloid, microorganism and bacteria in the water, so as to protect the reverse osmosis membrane. The quartz sand filter 511 and the bag filter 512 filter the large particle suspended matter and colloid in the water, so as to protect the ultrafiltration membrane. The produced water of the ultrafiltration device 513 enters the ultrafiltration produced water tank 52. After being pressurized by the reverse osmosis booster pump 53, the water enters the security filter 54, the reverse osmosis high-pressure pump 55, the reverse osmosis circulating pump 56 and finally enters the reverse osmosis device 57. The reverse osmosis device 57 adopts the operation mode of thick water large flow circulation, increases the water flow velocity on the membrane surface, and compared with the ordinary mode, can reduce the pollution of COD to the membrane. The recovery rate of the reverse osmosis device 57 reaches 90%, that is, the salt concentration of the inlet water is about 10 times. The reverse osmosis product water enters the reverse osmosis produced water tank 58, and is sent to the factory area reuse water point by the reverse osmosis produced water pump 59. The reverse osmosis concentrated liquid returns to the sewage adjusting tank 1. During the operation of the reverse osmosis, the reducing agent, the scale inhibitor and the non-oxidizing bactericide are added. The quartz sand filter 511 and the ultrafiltration device 513 need to be backwashed regularly. The reverse osmosis device 57 needs to be low-pressure flushed when starting / stop. The backwashing and flushing waste water is discharged to the sludge thickening tank 49 of the integrated sewage biological treatment device 4 through the ditch. The water quality of the produced water of the reverse osmosis device 57 is as follows: TDS is less than 20 mg / L, CODCr is less than 5 mg / L, and PH is 6-7.

[0060] The sludge tank of the sludge treatment device 6 receives the chemical sludge discharged by the chemical sludge batch reactor 22 of the integrated sewage biological treatment device 4 and the concentrated biochemical sludge discharged by the sludge concentration tank 49 of the integrated sewage biological treatment device 4, and is pressurized by a sludge pump 62 and then sent to a plate-and-frame filter press 63 for dewatering. After the sludge is dewatered and dried, the moisture content is less than 70%, and the sludge becomes a sludge cake. The sludge cake is transported by a belt conveyor 65 and unloaded into a dewatered sludge storage tank 66. The sludge cake is transported to a hazardous waste treatment plant. The water filtered by the plate-and-frame filter press 63 is discharged to the sewage adjusting tank 1 for recycling. The working steps of the plate-and-frame filter press 63 include pressing the filter plate, feeding, pressing, loosening the filter plate, and unloading the sludge. The pressing is performed by using water, and the water is supplied by a pressing water tank 641 and a pressing water pump 64 for recycling.

[0061] Finally, it should be noted that the above is only the preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device, characterized in that: The application relates to a wastewater treatment device, which comprises a chemical hardness removal device (2) for reducing wastewater hardness and a sludge treatment device (6), a water outlet of the chemical hardness removal device (2) is connected with an MVR evaporation crystallization device (3), a water outlet of the MVR evaporation crystallization device (3) is connected with an integrated sewage biological treatment device (4), a water outlet of the integrated sewage biological treatment device (4) is connected with a membrane treatment device (5), a sludge discharge port of the chemical hardness removal device (2) and a sludge discharge port of the integrated sewage biological treatment device (4) are both connected with the sludge treatment device (6). The MVR evaporation crystallization device (3) is used for evaporating, concentrating and crystallizing salt in water, so that solid impurity salt formed by crystallization is separated from distilled water. The integrated sewage biological treatment device (4) is used for further purifying the distilled water generated by the MVR evaporation crystallization device (3). The membrane treatment device (5) is used for filtering and separating supernatant generated by the integrated sewage biological treatment device (4). The sludge treatment device (6) is used for dewatering and drying sludge generated in the wastewater treatment.

2. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 1, characterized in that: The chemical hardness removal device (2) comprises a first lifting pump (21), wastewater is sucked into the first lifting pump (21) through a water inlet of the first lifting pump (21), a water outlet of the first lifting pump (21) is connected with a sequencing batch reactor (22), a water outlet of the sequencing batch reactor (22) is connected with a hardness removal tank (23), the chemical hardness removal device (2) further comprises a sodium hydroxide dosing device (241), a soda ash dosing device (242), a coagulant dosing device (243), a coagulant aid dosing device (244) and a heavy metal capture agent dosing device (245) for respectively adding sodium hydroxide, soda ash, coagulant and coagulant aid and heavy metal capture agent into the sequencing batch reactor (22), and the chemical hardness removal device (2) further comprises an acid adding device (246), and a medicine outlet of the acid adding device (246) is connected to a water outlet pipe of the sequencing batch reactor (22).

3. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 2, characterized in that: The MVR evaporation crystallization device (3) comprises a first water inlet booster pump (31), a water inlet of the first water inlet booster pump (31) is connected with a water outlet of the hardness removal tank (23), a water outlet of the first water inlet booster pump (31) is connected with a preheating device, a water outlet of the preheating device is connected with a forced circulation pump (33) for pressurizing wastewater, a water outlet of the forced circulation pump (33) is connected with a forced circulation evaporator (34), a discharge port of the forced circulation evaporator (34) is connected with a separator (35), a water outlet of the separator (35) is connected with a centrifugal machine (36), salt components in wastewater discharged from the separator (35) are separated out through centrifugal operation of the centrifugal machine (36), and a water outlet of the centrifugal machine (36) is used for discharging residual wastewater after centrifugal separation.

4. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 3, characterized in that: The preheating device comprises a first-stage preheater (37) and a second-stage preheater (38), the water inlet of the first-stage preheater (37) is communicated with the water inlet of the first water inlet booster pump (31), the water outlet of the first-stage preheater (37) is communicated with the water inlet of the second-stage preheater (38), the water outlet of the second-stage preheater (38) is communicated with the water inlet of the forced circulation pump (33), the heat medium of the first-stage preheater (37) is distilled water, the heat medium of the second-stage preheater (38) is low-pressure saturated steam, the steam inlet of the second-stage preheater (38) is communicated with an external steam pipe, the steam outlet of the separator (35) is communicated with a secondary steam compressor (39), the steam outlet of the secondary steam compressor (39) is communicated with the steam inlet of the forced circulation evaporator (34), the secondary steam compressed by the secondary steam compressor (39) enters the forced circulation evaporator (34) as the heat medium, the preheating device further comprises a distilled water tank (310), the distilled water formed after steam heat exchange in the first-stage preheater (37) and the distilled water condensed after secondary steam heat exchange in the forced circulation evaporator (34) are both transported to the distilled water tank (310) through the water outlets, the water inlet of the distilled water tank (310) is communicated with a distilled water pump (311), the distilled water pump (311) can boost the distilled water, and the water outlet of the distilled water pump (311) is communicated with the heat medium feeding port of the first-stage preheater (37).

5. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 4, characterized in that: The MVR evaporation crystallization device (3) further comprises a mother liquor tank (312), the water inlet of the mother liquor tank (312) is communicated with the water outlet of the centrifuge (36), the water outlet of the mother liquor tank (312) is communicated with a mother liquor pump (313), the water outlet of the mother liquor pump (313) is communicated with the feeding port of the separator (35), and the mother liquor pump (313) can boost the mother liquor discharged by the centrifuge (36).

6. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 5, characterized in that: The MVR evaporation crystallization device (3) further comprises a vacuum pump (314), the suction port of the vacuum pump (314) is communicated with a condenser (315), and the air inlet of the condenser (315) is communicated with the forced circulation evaporator (34).

7. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 6, characterized in that: The integrated sewage biological treatment device (4) comprises a cooler (41), a water inlet of the cooler (41) being communicated with a water outlet of the forced circulation evaporator (34), a water outlet of the cooler (41) being communicated with a water inlet pool (42), the water inlet pool (42) being provided with a biochemical lifting pump (43), a water outlet of the biochemical lifting pump (43) being communicated with an anoxic pool (44), the integrated sewage biological treatment device (4) further comprising an aerobic pool (45), wastewater in the anoxic pool (44) being sent into the aerobic pool (45) by the biochemical lifting pump (43) arranged in the anoxic pool (44), the aerobic pool (45) being communicated with a secondary sedimentation tank (46), the secondary sedimentation tank (46) being communicated with a inclined-tube sedimentation tank (47), a water outlet of the inclined-tube sedimentation tank (47) being communicated with a clear water pool (48), a sludge discharge port of the inclined-tube sedimentation tank (47) being communicated with a sludge concentration tank (49), a supernatant water outlet of the sludge concentration tank (49) being communicated with a supernatant pool (410), the supernatant pool (410) being provided with a supernatant pump (412), a liquid outlet of the supernatant pump (412) being communicated with the water inlet pool (42), the sludge concentration tank (49) being provided with a sludge concentration pump (411) arranged at a bottom of the sludge concentration tank (49), a sludge discharge port of the sludge concentration pump (411) being communicated with a sludge treatment device (6).

8. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 7, characterized in that: The membrane treatment device (5) comprises a pre-filtering device, a water inlet of the pre-filtering device being communicated with the clear water pool (48), the pre-filtering device being used for taking out suspended matters in wastewater, a water outlet of the pre-filtering device being communicated with an ultrafiltration water production tank (52), the ultrafiltration water production tank (52) being communicated with a reverse osmosis booster pump (53), the reverse osmosis booster pump (53) being communicated with a security filter (54), a water outlet of the security filter (54) being communicated with a reverse osmosis high-pressure pump (55), a water outlet of the reverse osmosis high-pressure pump (55) being communicated with a reverse osmosis circulating pump (56), the reverse osmosis circulating pump (56) being communicated with a reverse osmosis device (57), a water outlet of the reverse osmosis device (57) being communicated with a reverse osmosis water production tank (58), the reverse osmosis water production tank (58) being provided with a reverse osmosis water production pump (59), a water outlet of the reverse osmosis water production pump (59) being communicated with a factory area water reuse point, and a concentrated liquid water outlet of the reverse osmosis device (57) being communicated with the sewage conditioning pool (1).

9. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 8, characterized in that: The membrane treatment device (5) further comprises a reducing agent dosing device (5101), a scale inhibitor dosing device (5102) and a non-oxidizing bactericide dosing device (5103) communicated with an inlet pipe of the security filter (54).

10. The hazardous waste treatment plant high-salinity organic wastewater zero discharge treatment device according to claim 9, characterized in that: The sludge treatment device (6) comprises a sludge tank, a sludge pump (62) is arranged in the sludge tank, a plate-and-frame filter press (63) is communicated with a sludge outlet of the sludge pump (62), a press water pump (64) is communicated with a water outlet of the plate-and-frame filter press (63), a press water tank (641) is communicated with a water outlet of the press water pump (64), a belt conveyor (65) is connected to a dewatered sludge discharge outlet of the plate-and-frame filter press (63), and a dewatered sludge storage tank (66) is communicated with the belt conveyor (65).

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