CN214299746U - High recovery rate recycling system for printing and dyeing wastewater - Google Patents
High recovery rate recycling system for printing and dyeing wastewater Download PDFInfo
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- CN214299746U CN214299746U CN202022586658.9U CN202022586658U CN214299746U CN 214299746 U CN214299746 U CN 214299746U CN 202022586658 U CN202022586658 U CN 202022586658U CN 214299746 U CN214299746 U CN 214299746U
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Abstract
The utility model relates to a waste water recycle technical field especially relates to a printing and dyeing wastewater high recovery rate recycling system. The high recovery rate recycling system of printing and dyeing wastewater that this disclosure provides includes: an organic matter/COD abatement system and a membrane treatment system; the organic matter/COD eliminating system comprises an ozone generator, an ozone oxidation tank and an aerobic biofilter, wherein the outlet of the ozone generator is connected with the input pipeline of the ozone oxidation tank, and the outlet of the ozone oxidation tank is connected with the inlet of the aerobic biofilter; the membrane treatment system comprises an ultrafiltration system, a nanofiltration system, an ion exchange system and a reverse osmosis system which are connected in sequence, wherein a water outlet of the ultrafiltration system and a water outlet of the nanofiltration system are respectively connected with an inlet of the ozone oxidation tank, so that the adoption of high-energy-consumption processes such as chemical softening, evaporation, crystallization and the like is avoided, the production cost is saved, and the wastewater is recycled to the greatest extent.
Description
Technical Field
The utility model relates to a waste water recycle technical field especially relates to a printing and dyeing wastewater high recovery rate recycling system.
Background
The recycling and resource utilization of industrial wastewater become new environmental protection requirements in the century, the resource utilization is not only water recycling, but also water recycling and comprehensive utilization of various resources such as salt, acid, alkali or low-concentration materials in water.
At present, the zero discharge technology of the wastewater is often used as a basic route for resource utilization, the zero discharge requires that pollutants in the industrial wastewater are transferred in different forms at different stages, and finally the pollutants are treated in a solid form.
Zero-emission technology requires the comprehensive application of membrane separation, evaporative crystallization, drying and other processes. Aiming at zero discharge of high-salinity wastewater, a reverse osmosis membrane can prepare high-quality desalted water and becomes a preferred technology for treating the salinity wastewater, but the water yield of reverse osmosis is only 75% generally, and the treatment and discharge of the residual concentrated water become outstanding problems. The reverse osmosis concentrated water is highly concentrated strong brine, and the technical difficulty and the economic cost of the reverse osmosis concentrated water are higher for water resource recovery of the reverse osmosis concentrated water and separation of salt in water. At present, typical treatment methods of reverse osmosis concentrated water include surface water discharge, deep well injection, sprinkling irrigation, thermal evaporation and the like. However, the method cannot well utilize reverse osmosis concentrated water, discharge of the concentrated water is not reduced fundamentally, adverse effects are caused to the surrounding environment, and waste of water resources is also caused. In particular, in the industrial production process using water with a certain salt concentration as the water for production, the solid miscellaneous salt is finally prepared by zero discharge, so the investment and production cost are high, and the application of the technology is hindered.
If the strong brine can be recycled, the investment and the production cost can be greatly reduced, but when the strong brine is recycled, the strong brine needs to be purified so that the purity of the strong brine meets the requirements of process production.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a high recycling rate recycling system for printing and dyeing wastewater.
The first aspect of the present disclosure provides a printing and dyeing wastewater high recovery rate recycling system, including: an organic matter/COD abatement system and a membrane treatment system;
the organic matter/COD eliminating system comprises an ozone generator, an ozone oxidation tank and an aerobic biofilter, wherein the outlet of the ozone generator is connected with the input pipeline of the ozone oxidation tank, and the outlet of the ozone oxidation tank is connected with the inlet of the aerobic biofilter;
the membrane treatment system comprises an ultrafiltration system, a nanofiltration system, an ion exchange system and a reverse osmosis system which are connected in sequence, wherein a water outlet of the ultrafiltration system and a water outlet of the nanofiltration system are respectively connected with an inlet of the ozone oxidation tank, the ion exchange system comprises a standard discharge port, and the reverse osmosis system comprises a process water outlet and a strong brine outlet.
Further, a first partition plate and a second partition plate are arranged in the ozone oxidation tank, the first partition plate and the second partition plate are used for dividing the ozone oxidation tank into a first area, a second area and a third area, a first gap is formed between the first partition plate and the bottom wall of the ozone oxidation tank, and the second partition plate is abutted to the bottom wall of the ozone oxidation tank;
the ozone oxidation pond is provided with a sewage inlet, the sewage inlet is communicated with the first area, the input pipeline is arranged at the bottom of the second area, a first filler is arranged above the input pipeline, and an outlet of the ozone oxidation pond is communicated with the third area.
Further, the aerobic biofilter comprises at least one third partition plate and at least one fourth partition plate;
a second gap is formed between the third partition plate and the bottom wall of the aerobic biofilter, and the fourth partition plate is abutted against the bottom wall of the aerobic biofilter;
and a second filler is arranged in the aerobic biofilter.
Furthermore, an aeration component is arranged in the aerobic biofilter;
the aeration component comprises an aeration pipe, the aeration pipe is communicated with the air blower through a pipeline, a valve is arranged on the pipeline, a plurality of aeration holes are formed in the aeration pipe, and the aeration holes are communicated with the inside of the aeration pipe and the outside of the aeration pipe.
Furthermore, the ultrafiltration system comprises an ultrafiltration water supply pump, a self-cleaning filter, an ultrafiltration device and an ultrafiltration water generating tank which are arranged in sequence;
the inlet of the ultrafiltration water supply pump is connected with the outlet of the aerobic biofilter, the outlet of the ultrafiltration water supply pump is connected with the inlet of the self-cleaning filter, the outlet of the self-cleaning filter is connected with the inlet of the ultrafiltration device, and the outlet of the ultrafiltration device is connected with the inlet of the ultrafiltration water production tank;
an ultrafiltration backwashing pump is further arranged between the ultrafiltration water production tank and the ultrafiltration device, the inlet of the ultrafiltration backwashing pump is connected with the ultrafiltration water production tank, and the outlet of the ultrafiltration backwashing pump is connected with the backwashing inlet of the ultrafiltration device through a first pipeline;
and the first pipeline is respectively provided with an acid dosing device, an alkali dosing device and an oxidant dosing device.
Furthermore, the nanofiltration system also comprises a nanofiltration water supply pump, a security filter, a nanofiltration booster pump, a nanofiltration device and a nanofiltration water production tank which are connected in sequence;
the inlet of the nanofiltration water supply pump is connected with the outlet of the ultrafiltration system, the outlet of the nanofiltration water supply pump is connected with the inlet of the security filter through a second pipeline, the outlet of the security filter is connected with the inlet of the nanofiltration booster pump, the outlet of the nanofiltration booster pump is connected with the inlet of the nanofiltration device, and the outlet of the nanofiltration device is connected with the inlet of the nanofiltration water production tank;
and the second pipeline is respectively provided with a scale inhibitor dosing device and a reducing agent dosing device.
Furthermore, the ion exchange system comprises an ion exchange water supply pump and an ion exchange device which are connected in sequence, wherein the inlet of the ion exchange water supply pump is connected with the outlet of the nanofiltration system, and the outlet of the ion exchange water supply pump is connected with the inlet of the ion exchange device.
Furthermore, the reverse osmosis system comprises a precision filter, a reverse osmosis booster pump and a reverse osmosis device which are connected in sequence;
the inlet of the precision filter is connected with the outlet of the ion exchange system, the outlet of the precision filter is connected with the inlet of the reverse osmosis booster pump, and the outlet of the reverse osmosis booster pump is connected with the inlet of the reverse osmosis device;
the concentrated water outlet of the reverse osmosis device is connected with the concentrated water tank, and the clear water outlet of the reverse osmosis device is connected with the reverse osmosis water tank.
Furthermore, a reverse osmosis concentrated water pump is further arranged between the concentrated water tank and the ion exchange equipment, the inlet of the reverse osmosis concentrated water pump is connected with the concentrated water tank, and the outlet of the reverse osmosis concentrated water pump is connected with the regeneration port of the ion exchange equipment.
Further, the reverse osmosis device comprises a first section of reverse osmosis device, a second section of reverse osmosis device and a third section of reverse osmosis device which are connected in sequence;
the first section of reverse osmosis device and the second section of reverse osmosis device respectively comprise brackish water reverse osmosis membranes, and the third section of reverse osmosis device comprises a seawater desalination membrane.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the printing and dyeing wastewater high recovery rate recycling system provided by the embodiment of the disclosure comprises: an organic matter/COD abatement system and a membrane treatment system; the organic matter/COD eliminating system comprises an ozone generator, an ozone oxidation tank and an aerobic biofilter, wherein the outlet of the ozone generator is connected with an input pipeline arranged in the ozone oxidation tank, and the outlet of the ozone oxidation tank is connected with the inlet of the aerobic biofilter. When the device is used, the printing and dyeing wastewater treated by a sewage treatment plant is introduced into an ozone oxidation tank through a pipeline, the chromaticity and partial organic matters/COD in the water are removed by adding ozone generated by an ozone generator, and the biodegradability of the wastewater is improved. The wastewater is treated by the ozone oxidation tank and then flows to the aerobic biofilter, and organic matters/COD are further removed by biodegradation in the aerobic biofilter, so that organic pollution of each membrane in the membrane treatment recycling unit is avoided. After the treatment of the ozone oxidation pond and the aerobic biofilter, the chroma, the turbidity and the organic matters/COD of the water are greatly removed.
The ozone oxidation pond can be called as an ozone contact pond, and is a treatment structure which can diffuse ozone gas into treatment water, make the ozone gas fully contact with the water and complete reaction
The membrane treatment system comprises an ultrafiltration system, a nanofiltration system, an ion exchange system and a reverse osmosis system which are connected in sequence, wherein a water outlet of the ultrafiltration system and a water outlet of the nanofiltration system are respectively connected with an inlet of the ozone oxidation tank, the ion exchange system comprises a standard discharge port, and the reverse osmosis system comprises a process water outlet and a strong brine outlet. The effluent of the aerobic biofilter is conveyed to an ultrafiltration system, suspended particles in the effluent are removed to be used as the pretreatment of a subsequent advanced treatment device, and backwash wastewater and cleaning wastewater of the ultrafiltration system are discharged from a water outlet of the ultrafiltration system and return to a sewage treatment station. The effluent of the ultrafiltration system is conveyed to a nanofiltration system, and the nanofiltration system can remove more than 80 percent of COD, more than 95 percent of sulfate radicals, more than 70 percent of high-valence salts such as hardness and the like in the water. And (4) conveying the outlet water of the nanofiltration system to an ion exchange system, further removing the hardness of the outlet water to ensure that the hardness of the outlet water is less than 1mg/L, and discharging the nanofiltration concentrated water from a water outlet of the nanofiltration system and returning the nanofiltration concentrated water to a sewage treatment station. The effluent of the ion exchange system is conveyed to a reverse osmosis system, the reverse osmosis system can effectively separate chloride and bicarbonate in water to obtain strong brine with the concentration of 1.5-4% and process water with the conductivity of less than 300us/cm, and the process water is discharged from a process water outlet. The strong brine is discharged from the strong brine outlet and can be used for the dyeing process of the printing and dyeing process or for preparing brine and the like, and the process water is used for the whole printing and dyeing process, so that the high-recovery-rate operation of the printing and dyeing wastewater is realized.
The high recovery rate recycling system of printing and dyeing wastewater that this disclosure provided can enough realize that the recovery rate of higher reverse osmosis obtains the reuse water of higher proportion, also can carry out purification treatment to the reverse osmosis strong brine, gets rid of impurity such as hardness, sulfate radical, organic matter/COD, makes the strong brine of reverse osmosis can be used back in the dyeing process of printing and dyeing to make strong brine can be utilized, avoided adopting high energy consumption process routes such as chemical softening, evaporation, crystallization, practiced thrift manufacturing cost, furthest carries out resource utilization to waste water.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a high recovery rate recycling system for printing and dyeing wastewater according to an embodiment of the present disclosure.
Reference numerals:
101-an ozone generator; 102-an ozone oxidation tank; 103-aerobic biofilter; 104-a blower; 105-a first separator; 106-a second separator; 107-third separator plate; 108-a fourth separator; 201-an ultrafiltration device; 202-a nanofiltration device; 203-ion exchange equipment; 204-a reverse osmosis unit; 205-ultrafiltration water supply pump; 206-self-cleaning filter; 207-ultrafiltration water-producing pool; 208-ultrafiltration backwash pump; 209-acid dosing device; 210-an alkali dosing device; 211-oxidant dosing device; 212-nanofiltration water supply pump; 213-cartridge filter; 214-a nanofiltration booster pump; 215-antisludging agent dosing device; 216-reducing agent dosing device; 217-nanofiltration water production tank; 218-ion exchange water supply pump; 219-precision filter; 220-reverse osmosis booster pump; 221-a reverse osmosis water tank; 222-a concentrated water tank; 223-reverse osmosis concentrated water pump; 224-the drainage port of the ultrafiltration system; 225-a water outlet of the nanofiltration system; 226 — standard discharge port; 227-process water outlet; 228-concentrated brine outlet.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
As shown in fig. 1, the system for recycling printing and dyeing wastewater with high recovery rate provided by the embodiment of the disclosure includes: an organic matter/COD abatement system and a membrane treatment system; the organic matter/COD eliminating system comprises an ozone generator 101, an ozone oxidation tank 102 and an aerobic biofilter 103, wherein the outlet of the ozone generator 101 is connected with an input pipeline arranged in the ozone oxidation tank 102, micropores can be arranged on the input pipeline, and the ozone adding mode can adopt a micropore aeration mode. The outlet of the ozone oxidation pond 102 is connected with the inlet of the aerobic biofilter 103. The ozonation cell 102 may be packed with or without catalyst depending on the water quality conditions. When the device is used, the printing and dyeing wastewater treated by a sewage treatment plant is introduced into the ozone oxidation tank 102 through a pipeline, the ozone generated by the ozone generator 101 is added to remove the chromaticity and part of organic matters/COD in the water, and the biodegradability of the wastewater is improved. The wastewater is treated by the ozone oxidation tank 102 and then flows to the aerobic biofilter 103 automatically, and organic matter/COD is further removed by biodegradation in the aerobic biofilter 103, thereby avoiding organic pollution of each membrane in the membrane treatment recycling unit. After being treated by the ozone oxidation pond 102 and the aerobic biofilter 103, the chroma, turbidity and organic matter/COD of the water are greatly removed.
The membrane treatment system comprises an ultrafiltration system, a nanofiltration system, an ion exchange system and a reverse osmosis system which are connected in sequence, a water outlet 224 of the ultrafiltration system and a water outlet 225 of the nanofiltration system are respectively connected with an inlet of the ozone oxidation tank 102, the ion exchange system comprises a standard discharge outlet 226, and the reverse osmosis system comprises a process water outlet 227 and a strong brine outlet 228. The effluent of the aerobic biofilter 103 is conveyed to an ultrafiltration system to remove suspended particles in the water, and the water is used as the pretreatment of a subsequent advanced treatment device, and the backwashing wastewater and the cleaning wastewater of the ultrafiltration system are discharged from a water outlet 224 of the ultrafiltration system and returned to a sewage treatment station. The effluent of the ultrafiltration system is conveyed to a nanofiltration system, and the nanofiltration system can remove more than 80 percent of COD, more than 95 percent of sulfate radicals, more than 70 percent of high-valence salts such as hardness and the like in the water. And (3) conveying the outlet water of the nanofiltration system to an ion exchange system, further removing the hardness of the outlet water to ensure that the hardness of the outlet water is less than 1mg/L, and discharging nanofiltration concentrated water from a water outlet 225 of the nanofiltration system and returning the nanofiltration concentrated water to a sewage treatment station. The effluent of the ion exchange system is conveyed to a reverse osmosis system, the reverse osmosis system can effectively separate chloride and bicarbonate in water to obtain strong brine with the concentration of 1.5-4% and process water with the conductivity of less than 300us/cm, and the process water is discharged from a process water outlet 227. The strong brine is discharged from the strong brine outlet 228 and can be used for the dyeing process of the printing and dyeing process or for preparing brine and the like, and the process water is used for the whole printing and dyeing process, so that the high-recovery-rate operation of the printing and dyeing wastewater is realized.
The high recovery rate recycling system of printing and dyeing waste water that this disclosure provided can enough realize that the recovery rate of higher reverse osmosis obtains the reuse water of higher proportion, also can carry out purification treatment to the reverse osmosis strong brine, gets rid of impurity such as hardness, sulfate radical, organic matter COD, makes the strong brine of reverse osmosis can be used back in the dyeing process of printing and dyeing to make the strong brine can be utilized. Avoids the adoption of high-energy-consumption process routes such as chemical softening, evaporation, crystallization and the like, saves the production cost and furthest performs resource utilization on the wastewater.
In some specific embodiments, a first partition plate 105 and a second partition plate 106 are arranged in the ozone oxidation tank 102, the first partition plate 105 and the second partition plate 106 are used for dividing the ozone oxidation tank 102 into a first area, a second area and a third area, a first gap is arranged between the first partition plate 105 and the bottom wall of the ozone oxidation tank 102, and the second partition plate 106 is abutted against the bottom wall of the ozone oxidation tank 102; the ozone oxidation pond 102 is provided with a sewage inlet, the sewage inlet is communicated with the first area, the input pipeline is arranged at the bottom of the second area, the first filler is arranged above the input pipeline, and the outlet of the ozone oxidation pond 102 is communicated with the third area. The printing and dyeing wastewater is introduced into the first area from the sewage inlet, the printing and dyeing wastewater enters the second area from the bottom of the first partition plate 105, and then the printing and dyeing wastewater enters the third area from the top of the second partition plate 106, so that the printing and dyeing wastewater flows in the S-shaped route after flowing into the ozone oxidation tank 102, the flowing stroke of the printing and dyeing wastewater is prolonged, the mixing uniformity of the printing and dyeing wastewater is effectively promoted, and the printing and dyeing wastewater can be ensured to effectively and fully react in each reaction area.
Optionally, a first filler frame is arranged in the ozone oxidation tank 102, and first fillers are uniformly arranged on the first filler frame and can provide a larger contact area for printing and dyeing wastewater. Optionally, the first filler may be a fibrous filler, or may be a porous material.
The printing and dyeing wastewater treated by the sewage treatment plant is introduced into the ozone oxidation tank 102 through a pipeline, and the chroma and partial organic matters/COD in the water can be removed by adding ozone generated by the ozone generator 101, and the biodegradability of the wastewater can be improved.
In some embodiments, the aerobic biological filter 103 comprises at least one third partition 107 and at least one fourth partition 108; a second gap is arranged between the third partition plate 107 and the bottom wall of the aerobic biofilter 103, and the fourth partition plate 108 is abutted against the bottom wall of the aerobic biofilter 103; a second filler is arranged in the aerobic biofilter 103. In this embodiment, the aerobic biofilter 103 does not need a back-flushing facility, and is divided into a plurality of continuous areas connected in series, and a water distribution manner with up-and-down baffling is adopted, and the aerobic biofilter is divided into a plurality of spaces in the height direction, so that the printing and dyeing wastewater can flow in an S-shaped route after flowing into the aerobic biofilter 103, thereby prolonging the flow stroke of the printing and dyeing wastewater, effectively promoting the mixing uniformity of the printing and dyeing wastewater, and ensuring that the printing and dyeing wastewater can fully contact with the second filler in each reaction zone, thereby carrying out effective and sufficient reaction.
Optionally, a second filler frame is arranged in the aerobic biofilter 103, second fillers are uniformly arranged on the second filler frame, and the second fillers can provide a larger biological contact area for printing and dyeing wastewater. Optionally, the second filler may be a fibrous filler, or may be a porous material. The volume of the second filler is 30-60% of the total volume.
In some specific embodiments, an aeration component is arranged in the aerobic biofilter 103; the aeration component comprises an aeration pipe, the aeration pipe is communicated with the air blower 104 through a pipeline, a valve is arranged on the pipeline and used for adjusting aeration quantity or closing aeration, a plurality of aeration holes are formed in the aeration pipe, and the aeration holes are communicated with the inside of the aeration pipe and the outside of the aeration pipe.
Preferably, the diameter of the aeration holes is 4 mm-6 mm, the distance between the aeration holes is 25 cm-50 cm, and the aeration rate is the air-water ratio: 0.5 to 2.
The wastewater is treated by the ozone oxidation pond 102 and then flows to the aerobic biofilter 103 automatically, organic matters/COD are further removed through biodegradation in the aerobic biofilter 103, organic pollution of each membrane in the membrane treatment recycling unit is avoided, and the chromaticity, turbidity and organic matters/COD of the water are greatly removed through treatment of the ozone oxidation pond 102 and the aerobic biofilter 103.
In some embodiments, the ultrafiltration system comprises an ultrafiltration water supply pump 205, a self-cleaning filter 206, an ultrafiltration device 201, and an ultrafiltration water production tank 207, which are arranged in sequence; the inlet of the ultrafiltration water supply pump 205 is connected with the outlet of the aerobic biofilter 103, the outlet of the ultrafiltration water supply pump 205 is connected with the inlet of the self-cleaning filter 206, the outlet of the self-cleaning filter 206 is connected with the inlet of the ultrafiltration device 201, and the outlet of the ultrafiltration device 201 is connected with the inlet of the ultrafiltration water production tank 207; an ultrafiltration backwashing pump 208 is also arranged between the ultrafiltration water generating tank 207 and the ultrafiltration device 201, the inlet of the ultrafiltration backwashing pump 208 is connected with the ultrafiltration water generating tank 207, and the outlet of the ultrafiltration backwashing pump 208 is connected with the backwashing inlet of the ultrafiltration device 201 through a first pipeline; the first pipeline is respectively provided with an acid dosing device 209, an alkali dosing device 210 and an oxidant dosing device 211. The effluent of the aerobic biofilter 103 is stored in a water inlet tank of the ultrafiltration system, is pressurized and conveyed to the ultrafiltration device 201 through a pump, and is used for removing suspended particles in water as the pretreatment of a subsequent advanced treatment device. The backwash wastewater and the cleaning wastewater of the ultrafiltration device 201 are returned to the sewage treatment station.
The dosing device comprises a metering tank (a medicament storage tank), a metering pump (a dosing pump), a controller, a connecting pipe valve and the like. The combined dosing device is placed in the dosing room, and then the outlet of the metering pump is connected with the first pipeline, so that the dosing pump can be put into operation. The acid dosing device 209 is used for adding backwashing acid to the first pipeline, the alkali dosing device 210 is used for adding alkali to the first pipeline, and the oxidant dosing device 211 is used for adding oxidant to the first pipeline.
In some specific embodiments, the nanofiltration system further comprises a nanofiltration water supply pump 212, a security filter 213, a nanofiltration booster pump 214, a nanofiltration device 202 and a nanofiltration water production tank 217 connected in sequence; an inlet of the nanofiltration water supply pump 212 is connected with an outlet of the ultrafiltration system, specifically, an inlet of the nanofiltration water supply pump 212 is connected with an outlet of the ultrafiltration water production tank 207, an outlet of the nanofiltration water supply pump 212 is connected with an inlet of the security filter 213 through a second pipeline, an outlet of the security filter 213 is connected with an inlet of the nanofiltration booster pump 214, an outlet of the nanofiltration booster pump 214 is connected with an inlet of the nanofiltration device 202, and an outlet of the nanofiltration device 202 is connected with an inlet of the nanofiltration water production tank 217. And the second pipeline is respectively provided with a scale inhibitor dosing device 215 and a reducing agent dosing device 216. The scale inhibitor dosing device 215 is used for adding a scale inhibitor to the second pipeline, and the reducing agent dosing device 216 is used for adding a reducing agent to the second pipeline. The effluent of the ultrafiltration device 201 is pressurized by a pump and is delivered to the nanofiltration device 202, and the nanofiltration device 202 can remove more than 80% of COD, more than 95% of sulfate radicals, more than 70% of high-valence salts such as hardness and the like in the water.
In some specific embodiments, the ion exchange system comprises an ion exchange water supply pump 218 and an ion exchange device 203 which are connected in sequence, wherein an inlet of the ion exchange water supply pump 218 is connected with an outlet of the nanofiltration system, specifically, an inlet of the ion exchange water supply pump 218 is connected with an outlet of a nanofiltration water production tank 217, an outlet of the ion exchange water supply pump 218 is connected with an inlet of the ion exchange device 203, the hardness of the water is further removed, the hardness of the effluent is enabled to be less than 1mg/L, and the concentrated water of the nanofiltration device 202 is returned to the sewage treatment station.
In some embodiments, the reverse osmosis system comprises a precision filter 219, a reverse osmosis booster pump 220, and a reverse osmosis unit 204 connected in series; an inlet of the precision filter 219 is connected with an outlet of the ion exchange system, specifically, an inlet of the precision filter 219 is connected with an outlet of the ion exchange device 203, an outlet of the precision filter 219 is connected with an inlet of the reverse osmosis booster pump 220, and an outlet of the reverse osmosis booster pump 220 is connected with an inlet of the reverse osmosis device 204; a concentrated water outlet of the reverse osmosis device 204 is connected with the concentrated water tank 222, and a clear water outlet of the reverse osmosis device 204 is connected with the reverse osmosis water tank 221; a reverse osmosis concentrated water pump 223 is further arranged between the concentrated water tank 222 and the ion exchange equipment 203, the inlet of the reverse osmosis concentrated water pump 223 is connected with the concentrated water tank 222, and the outlet of the reverse osmosis concentrated water pump 223 is connected with the regeneration port of the ion exchange equipment 203.
In some specific embodiments, the reverse osmosis unit 204 comprises a first stage reverse osmosis unit 204, a second stage reverse osmosis unit 204, and a third stage reverse osmosis unit 204 connected in series; the first section reverse osmosis device 204 and the second section reverse osmosis device 204 respectively comprise brackish water reverse osmosis membranes, and the third section reverse osmosis device 204 comprises a seawater desalination membrane. The reverse osmosis device 204 can effectively separate chloride and bicarbonate in water to obtain concentrated brine with the concentration of 1.5-4% and process water with the conductivity of less than 300 us/cm. The strong brine can be used for the dyeing process of the printing and dyeing process or used for preparing brine and the like, and the process water is used for the whole printing and dyeing process, so that the high-recovery-rate operation of the printing and dyeing wastewater is realized.
The high-recovery-rate recycling method for the printing and dyeing wastewater provided by the embodiment of the disclosure comprises the following steps:
the printing and dyeing wastewater treated by the sewage treatment plant is introduced into an ozone oxidation tank 102, and the ozone generated by an ozone generator 101 is added to remove the chroma and partial organic matters/COD in the water and improve the biodegradability of the wastewater.
The wastewater is treated by the ozone oxidation tank 102 and then flows to the aerobic biofilter 103 automatically, and organic matter/COD is further removed by biodegradation in the aerobic biofilter 103, thereby avoiding organic pollution of each membrane in the membrane treatment recycling unit. After ozone oxidation and aerobic biofilter 103 treatment, the chroma, turbidity and organic matter/COD of the removed water are greatly removed.
The effluent of the aerobic biofilter 103 is pressurized and conveyed to an ultrafiltration system through a pump, suspended particles in the effluent are removed, the effluent is used as the pretreatment of a subsequent advanced treatment device, and backwashing wastewater and cleaning wastewater of the ultrafiltration system return to a sewage treatment station.
The effluent of the ultrafiltration system is pressurized by a pump and is conveyed to the nanofiltration system, the nanofiltration system removes organic matters/COD, sulfate radicals and hardness in water, and the nanofiltration device 202 can remove more than 80% of organic matters/COD, more than 95% of sulfate radicals, more than 70% of hardness and other high-valence salts in water.
The outlet water of the nanofiltration system is pressurized by a pump and is conveyed to an ion exchange system, the hardness of the outlet water is further removed, the hardness of the outlet water is less than 1mg/L, and the concentrated water of the nanofiltration system returns to a sewage treatment station;
the effluent of the ion exchange system is pressurized and then conveyed to a reverse osmosis system, the reverse osmosis system can effectively separate chloride and bicarbonate in water to obtain strong brine with the concentration of 1.5-4% and process water with the conductivity of less than 300us/cm, the strong brine can be used for a dyeing process of a printing and dyeing process or used for preparing brine, and the process water is used for the whole printing and dyeing process, so that the high-recovery-rate operation of the printing and dyeing wastewater is realized.
In the embodiment, the recovery rate of the reverse osmosis device 204 is more than 90%, the salt content of the concentrated water of the reverse osmosis device 204 is more than 1.5%, and the hardness is less than 50 mg/L. Further, the salt rejection rate of the nanofiltration device 202 is less than 15%, and the organic matter/COD removal rate is greater than 85%. Further, the hardness of reverse osmosis inlet water is less than 5mg/L, that is, the hardness of outlet water passing through the nanofiltration device 202 and the ion exchange device 203 is less than 5 mg/L. Further, a catalyst may be added to the ozonation cell 102 to accelerate the reaction and improve the removal effect.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a printing and dyeing wastewater high recovery rate recycling system which characterized in that includes: an organic matter/COD abatement system and a membrane treatment system;
the organic matter/COD eliminating system comprises an ozone generator (101), an ozone oxidation tank (102) and an aerobic biofilter (103), wherein the outlet of the ozone generator (101) is connected with an input pipeline arranged in the ozone oxidation tank (102), and the outlet of the ozone oxidation tank (102) is connected with the inlet of the aerobic biofilter (103);
the membrane treatment system comprises an ultrafiltration system, a nanofiltration system, an ion exchange system and a reverse osmosis system which are connected in sequence, wherein a water outlet (224) of the ultrafiltration system and a water outlet (225) of the nanofiltration system are respectively connected with an inlet of the ozone oxidation tank (102), the ion exchange system comprises a standard discharge outlet (226), and the reverse osmosis system comprises a process water outlet (227) and a strong brine outlet (228).
2. The printing and dyeing wastewater high-recovery-rate recycling system according to claim 1, characterized in that a first partition plate (105) and a second partition plate (106) are arranged in the ozone oxidation pond (102), the first partition plate (105) and the second partition plate (106) are used for dividing the ozone oxidation pond (102) into a first area, a second area and a third area, a first gap is arranged between the first partition plate (105) and the bottom wall of the ozone oxidation pond (102), and the second partition plate (106) abuts against the bottom wall of the ozone oxidation pond (102);
the ozone oxidation pond (102) is provided with a sewage inlet which is communicated with the first area, the input pipeline is arranged at the bottom of the second area, a first filler is arranged above the input pipeline, and an outlet of the ozone oxidation pond (102) is communicated with the third area.
3. The high recycling rate system of printing and dyeing wastewater according to claim 1, characterized in that the aerobic biofilter (103) comprises at least one third partition (107) and at least one fourth partition (108);
a second gap is formed between the third partition plate (107) and the bottom wall of the aerobic biofilter (103), and the fourth partition plate (108) is abutted against the bottom wall of the aerobic biofilter (103);
and a second filler is arranged in the aerobic biofilter (103).
4. The high-recovery-rate recycling system for printing and dyeing wastewater according to claim 3, characterized in that an aeration component is arranged in the aerobic biofilter (103);
the aeration component comprises an aeration pipe, the aeration pipe is communicated with an air blower (104) through a pipeline, a valve is arranged on the pipeline, a plurality of aeration holes are formed in the aeration pipe, and the aeration holes are communicated with the inside of the aeration pipe and the outside of the aeration pipe.
5. The high-recovery-rate recycling system for printing and dyeing wastewater as claimed in claim 1, wherein the ultrafiltration system comprises an ultrafiltration water supply pump (205), a self-cleaning filter (206), an ultrafiltration device (201) and an ultrafiltration water production pool (207) which are arranged in sequence;
the inlet of the ultrafiltration water supply pump (205) is connected with the outlet of the aerobic biofilter (103), the outlet of the ultrafiltration water supply pump (205) is connected with the inlet of the self-cleaning filter (206), the outlet of the self-cleaning filter (206) is connected with the inlet of the ultrafiltration device (201), and the outlet of the ultrafiltration device (201) is connected with the inlet of the ultrafiltration water generating pool (207);
an ultrafiltration backwashing pump (208) is further arranged between the ultrafiltration water generating tank (207) and the ultrafiltration device (201), an inlet of the ultrafiltration backwashing pump (208) is connected with the ultrafiltration water generating tank (207), and an outlet of the ultrafiltration backwashing pump (208) is connected with a backwashing inlet of the ultrafiltration device (201) through a first pipeline;
and the first pipeline is respectively provided with an acid dosing device (209), an alkali dosing device (210) and an oxidant dosing device (211).
6. The high-recovery-rate recycling system for printing and dyeing wastewater according to claim 1, wherein the nanofiltration system further comprises a nanofiltration water supply pump (212), a security filter (213), a nanofiltration booster pump (214), a nanofiltration device (202) and a nanofiltration water production tank (217) which are connected in sequence;
the inlet of the nanofiltration water supply pump (212) is connected with the outlet of the ultrafiltration system, the outlet of the nanofiltration water supply pump (212) is connected with the inlet of the security filter (213) through a second pipeline, the outlet of the security filter (213) is connected with the inlet of the nanofiltration booster pump (214), the outlet of the nanofiltration booster pump (214) is connected with the inlet of the nanofiltration device (202), and the outlet of the nanofiltration device (202) is connected with the inlet of the nanofiltration water generating tank (217);
and the second pipeline is respectively provided with a scale inhibitor dosing device (215) and a reducing agent dosing device (216).
7. The printing and dyeing wastewater high-recovery recycling system according to claim 1, wherein the ion exchange system comprises an ion exchange water supply pump (218) and an ion exchange device (203) which are connected in sequence, an inlet of the ion exchange water supply pump (218) is connected with an outlet of the nanofiltration system, and an outlet of the ion exchange water supply pump (218) is connected with an inlet of the ion exchange device (203).
8. The printing and dyeing wastewater high-recovery-rate recycling system according to claim 7, wherein the reverse osmosis system comprises a precision filter (219), a reverse osmosis booster pump (220) and a reverse osmosis device (204) which are connected in sequence;
the inlet of the precision filter (219) is connected with the outlet of the ion exchange system, the outlet of the precision filter (219) is connected with the inlet of the reverse osmosis booster pump (220), and the outlet of the reverse osmosis booster pump (220) is connected with the inlet of the reverse osmosis device (204);
the concentrated water outlet of the reverse osmosis device (204) is connected with the concentrated water pool (222), and the clear water outlet of the reverse osmosis device (204) is connected with the reverse osmosis water pool (221).
9. The printing and dyeing wastewater high-recovery rate recycling system according to claim 8, characterized in that a reverse osmosis concentrated water pump (223) is further arranged between the concentrated water tank (222) and the ion exchange equipment (203), an inlet of the reverse osmosis concentrated water pump (223) is connected with the concentrated water tank (222), and an outlet of the reverse osmosis concentrated water pump (223) is connected with a regeneration port of the ion exchange equipment (203).
10. The printing and dyeing wastewater high-recovery-rate recycling system according to claim 8, wherein the reverse osmosis device (204) comprises a first section of reverse osmosis device (204), a second section of reverse osmosis device (204) and a third section of reverse osmosis device (204) which are connected in sequence;
the first section of reverse osmosis device (204) and the second section of reverse osmosis device (204) respectively comprise brackish water reverse osmosis membranes, and the third section of reverse osmosis device (204) comprises a seawater desalination membrane.
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