CN106542680B - Wastewater treatment method for green and environment-friendly electrophoretic paint production - Google Patents
Wastewater treatment method for green and environment-friendly electrophoretic paint production Download PDFInfo
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- CN106542680B CN106542680B CN201610913428.4A CN201610913428A CN106542680B CN 106542680 B CN106542680 B CN 106542680B CN 201610913428 A CN201610913428 A CN 201610913428A CN 106542680 B CN106542680 B CN 106542680B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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Abstract
The invention discloses a wastewater treatment method for green and environment-friendly electrophoretic paint production, wherein a deionized water cleaning tank is provided with a circulating filter device; the electrophoresis tank adopts two-stage filtration devices of rough filtration and fine filtration, wherein the rough filtration aperture is 50um, and the fine filtration aperture is 25 um; the cleaning tank adopts a multi-stage recovery cleaning mode of two groups of spraying tanks and the cleaning tank, and is provided with an ultrafiltration device; the reservoir is provided with a reverse osmosis device. The recovery and reuse electrophoresis cleaning device has the advantages that the utilization rate of electrophoresis solid materials can reach more than 95%, the reuse rate of deionized cleaning water can reach more than 98%, electrophoresis wastewater discharged from a liquid storage tank of which the content is less than 2% is discharged after simple neutralization, coagulation, precipitation and sand filtration, and the zero discharge of the cleaning wastewater in electrophoresis production is realized.
Description
Technical Field
The invention belongs to the technical field of electrophoretic paint production, and particularly relates to a wastewater treatment method for green and environment-friendly electrophoretic paint production.
Background
At present, the electrophoretic paint adopts water-soluble resin, has low solid content, high material utilization rate and small organic solvent dosage, generates a small amount of VOC, can be cured at low temperature, is energy-saving and environment-friendly, and has wider and wider application.
The metal surface treatment method is multiple, a large amount of toxic wastewater containing heavy metal, chromium, cyanide and the like generated in electroplating production is restricted, the amount of sprayed organic solvent is large, a large amount of VOC is generated in production, the material utilization rate is low, high-temperature curing is required, energy is not saved, and the environment is not protected.
Disclosure of Invention
The invention aims to provide a method for treating waste water generated in production of green and environment-friendly electrophoretic paint, and aims to solve the problems that the existing metal surface treatment method has the defects of high organic solvent consumption, generation of a large amount of VOC, low material utilization rate, high-temperature curing, generation of a large amount of waste water containing resin components, metal ions and salts, which needs to be treated, removal of the metal ions needs a large amount of acid and alkali, secondary water pollution, energy conservation and no environment protection.
The invention is realized in such a way, the wastewater treatment method for the green environment-friendly electrophoretic paint production comprises the following steps: a final deionized water cleaning tank before cathode electrophoresis is provided with a precise filtering device with the filtering precision of 25um, so as to remove solid particles and suspended impurities; the cathode electrophoresis tank is provided with a two-stage filtering device of coarse filtering and fine filtering to remove solid particle impurities in the electrophoresis tank liquid; the electrophoresis tank, the post-electrophoresis cleaning tank and the deionized water cleaning tank are provided with ultrafiltration devices, the ultrafiltration penetrating fluid enters a fluid storage tank, the fluid storage tank is provided with a reverse osmosis device, the reverse osmosis penetrating fluid is used as cleaning water for the post-electrophoresis deionized water cleaning tank, ultrafiltrate in the fluid storage tank is pumped to a cation exchange tank, metal ions are removed by a cation exchange resin device and then used as spraying water for a spraying tank II, the cation exchange resin regeneration adopts a bipolar membrane electrodialysis method, acid and alkali are not needed, metal impurity ions enter a brine chamber, centralized treatment can be realized, alkali is generated at the same time, the alkali can be used as materials for oil removal and alkali cleaning in pre-electrophoresis treatment, and a large amount of acid and alkali materials are saved; spraying and cleaning water after electrophoresis is recycled to an electrophoresis tank by adopting a multi-stage recovery method, and no cleaning wastewater is generated in the whole process of electrophoresis production; the method comprises the steps of arranging special cleaning tanks for a precision filter, an ultrafiltration membrane and a reverse osmosis membrane, needing regular cleaning, cleaning the ultrafiltration membrane and the reverse osmosis membrane, flushing resin back to an equipment using tank by using deionized water to reduce waste of resin materials and discharge of harmful substances, intensively discharging clear bottom water of electrophoresis production process tanks such as equipment cleaning water and a small amount of liquid storage tanks to an electrophoresis wastewater tank, adding lime milk, adjusting the pH to 6.5-7.0, adding a PMA flocculant, slowly stirring, precipitating, pumping out supernatant, discharging through sand filtration, precipitating, feeding a flocculating agent into a sludge tank, performing filter pressing and curing treatment, and completely enabling COD (chemical oxygen demand) of the discharged wastewater to reach the discharge standard specified by the national environmental protection department after treatment.
Another object of the present invention is to provide a wastewater treatment apparatus for green electrophoretic paint production, which is the wastewater treatment method for green electrophoretic paint production, comprising: the device comprises a first deionized water cleaning tank, an electrophoresis tank, a cleaning tank, a spraying tank, a liquid storage tank, a cation exchange tank, a second deionized water cleaning tank, an equipment cleaning tank, a transition tank, a wastewater tank, a reaction tank and a sand filter tank;
cleaning water of 6 production process tanks, namely a first deionized water cleaning tank, a cathode electrophoresis tank, a spraying tank I, a cleaning tank, a spraying tank II and a second deionized water cleaning tank, is finally recycled to the cathode electrophoresis tank by adopting a step-by-step recovery method; the first deionized water cleaning tank filter is circularly filtered through a water inlet pipe and a water outlet pipe; the cathode electrophoresis tank liquid is pumped to a transition tank through rough filtration by a pipeline and pumped back to the cathode electrophoresis tank through fine filtration by a pipeline; the cathode electrophoresis tank liquid is circularly treated by an ultrafilter through a pipeline, and the ultrafiltrate is discharged to a liquid storage tank through a pipeline; the spray water of the spray tank is circulated by a water pump through a pipeline; cleaning water of the cleaning tank circulates through an ultrafilter through a pipeline, and ultrafiltrate is discharged to a liquid storage tank through the pipeline; circulating the second deionized water cleaning tank through an ultrafilter through a pipeline, and discharging ultrafiltrate to a liquid storage tank; the liquid in the liquid storage tank is subjected to reverse osmosis circulation through a pipeline, and the reverse osmosis liquid is discharged to the second deionized water cleaning tank through the pipeline; pumping the liquid in the liquid storage tank to a cation exchange tank through a water pump, circulating through cation exchange resin through a pipeline, removing metal ions, and pumping to a spraying tank II through the water pump for recycling; cleaning water of the equipment cleaning tank is directly discharged to a wastewater tank, the wastewater tank is pumped to a reaction tank by a water pump for treatment, and supernatant is pumped to a sand filter by the water pump and is directly discharged by sand filtration; the sediment and the floc are pumped into a sludge tank by a sludge pump for pressure filtration treatment.
Further, the deionized water washing tank before electrophoresis is provided with a circulating filter with the filtering precision of 25um, and the deionized water washing tank after electrophoresis is provided with an ultrafilter.
Furthermore, the electrophoresis tank is provided with an ultrafilter, and simultaneously adopts a two-stage circulating filter of coarse filtration and fine filtration, wherein the coarse filtration precision is 50um, and the fine filtration precision is 25 um.
Further, the washing tank adopts two sets of spraying tank + washing tank multistage recovery cleaning mode, installs the electrophoresis lacquer ultrafilter.
Further, the reservoir is provided with a reverse osmosis system for electrophoresis production cleaning.
Further, the cation exchange tank is provided with a cation resin exchanger, and the cation exchange resin is provided with a bipolar membrane electrodialysis regeneration device.
Further, the bipolar membrane electrodialysis regeneration device is provided with an anode, the anode is connected with the positive electrode of a power supply, brine is placed in an alkaline water chamber before regeneration, cation exchange resin is placed in the brine between the bipolar membrane and the cation exchange membrane, a cathode is placed in the brine chamber, and the cathode is connected with the negative electrode of the power supply.
According to the method for treating the waste water generated in the production of the green environment-friendly electrophoretic paint, the electrophoretic production adopts technologies such as rough filtration, fine filtration, ultrafiltration, reverse osmosis, cation exchange and the like, so that the cleaning quality of the electrophoretic paint is improved, the performance of an electrophoresis tank liquid is stabilized, the reuse rate of electrophoretic cleaning water is improved, the discharge amount of the waste water generated in the production of the electrophoretic paint is greatly reduced, zero discharge is truly realized, and the electrophoretic paint becomes a new green pollution-free surface treatment technology in the true sense.
The electrophoretic paint disclosed by the invention adopts a green and environment-friendly formula, is low in solid content and VOC (volatile organic compounds), is good in stability of an electrophoretic bath solution, and can be used for a long time in continuous production; the dispersion particle size of the emulsion is 30-60 nm, the dispersion performance is good, layering is not easy, an ultrafiltration and filtration device is not easy to block, the cleaning period is prolonged, and the cleaning frequency is reduced from 2-3 times per month to 1 time per month, so that the generation of electrophoresis cleaning wastewater is greatly reduced; the last deionized water cleaning tank before electrophoresis is additionally provided with a circulating filter device, so that the carrying amount of solid suspended impurities and metal impurity workpieces in the electrophoresis tank is reduced, the replacement period of the deionized water cleaning tank is prolonged, clean water needs to be replaced once a week in the original continuous production, the clean water is replaced at most once a month at present, the use amount of deionized water is reduced, and the generation of electrophoresis wastewater is correspondingly reduced; the electrophoresis tank adopts two-stage filtration devices of rough filtration and fine filtration, the rough filtration aperture is 50um, the fine filtration aperture is 25um, and solid suspended impurities in the tank liquor are removed in a grading way, so that the removal efficiency is improved, the removal rate is improved from the original difficult removal to the removal rate capable of removing more than 95 percent of the solid suspended impurities, the filtration device, the subsequent ultrafiltration membrane and the reverse osmosis membrane are not easy to block, the cleaning period can be prolonged, and the generation of cleaning wastewater is reduced; the post-electrophoresis cleaning adopts a multi-stage recovery cleaning mode of two groups of spraying tanks and a cleaning tank, the cleaning tank is provided with an ultrafiltration device, the solid components such as electrophoresis resin and the like are recovered, the material utilization rate is improved and can reach more than 98%, the utilization rate is at most 70-80% without the cleaning recovery device, and ultrafiltration discharge water enters a liquid storage tank; the reverse osmosis membrane intercepts smaller resin molecules and dissolved salts, the recovery rate of the electrophoretic paint can be improved, the consumption of deionized water is reduced, the material utilization rate can reach nearly 100% after the micromolecule resin is recovered, and the using amount of the deionized water is reduced by half. A final deionized water cleaning tank before cathode electrophoresis is provided with a precise filtering device, the filtering precision is 25 mu m, solid particles and suspended impurities are removed, the carrying amount of impurity workpieces in the electrophoresis tank is reduced, and meanwhile, cleaning water of the cleaning tank is purified, so that deionized water is saved, and the cleaning wastewater amount is reduced; the cathode electrophoresis tank is provided with a two-stage filtering device of rough filtering and fine filtering, so that solid particle impurities in the electrophoresis tank liquid are removed, and the blockage of an ultrafiltration membrane is reduced; the electrophoresis tank, the post-electrophoresis cleaning tank and the deionized water cleaning tank are provided with ultrafiltration devices, ultrafiltration penetrating fluid enters a fluid storage tank, the fluid storage tank is provided with a reverse osmosis device, the reverse osmosis penetrating fluid is used as cleaning water for the post-electrophoresis deionized water cleaning tank, ultrafiltrate in the fluid storage tank is pumped to a cation exchange tank, metal ions are removed through a cation exchange resin device and then used as spraying water for a spraying tank II, the cation exchange resin regeneration bipolar membrane electrodialysis device does not need to use a large amount of acid and alkali, a large amount of acid-base cleaning wastewater cannot be generated due to regeneration, and meanwhile acid-base chemical materials are saved; the spraying and cleaning water after electrophoresis is recycled to the electrophoresis tank by adopting a multi-stage recovery method, and no cleaning wastewater is generated in the whole process of electrophoresis production. The method comprises the steps of arranging special cleaning tanks for a precision filter, an ultrafiltration membrane and a reverse osmosis membrane, needing regular cleaning, cleaning the ultrafiltration membrane and the reverse osmosis membrane, flushing resin back to an equipment using tank by using deionized water to reduce waste of resin materials and discharge of harmful substances, intensively discharging clear bottom water of electrophoresis production process tanks such as equipment cleaning water and a small amount of liquid storage tanks to an electrophoresis wastewater tank, adding lime milk, adjusting the pH to 6.5-7.0, adding a PMA flocculant, slowly stirring and precipitating, pumping supernatant, discharging through sand filtration, precipitating, feeding the flocculent into a sludge tank, performing filter pressing and curing treatment, and completely enabling COD (chemical oxygen demand) of the discharged wastewater to reach the discharge standard specified by the national environmental protection department after treatment.
The recovery and reuse electrophoresis cleaning device has the advantages that the utilization rate of electrophoresis solid materials can reach more than 95%, the reuse rate of deionized cleaning water can reach more than 98%, electrophoresis wastewater discharged from a liquid storage tank of which the content is less than 2% is discharged after simple neutralization, coagulation, precipitation and sand filtration, and the zero discharge of the cleaning wastewater in electrophoresis production is realized.
Drawings
FIG. 1 is a flow chart of a wastewater treatment method for green environmental protection electrophoretic paint production provided by the embodiment of the invention.
FIG. 2 is a schematic structural diagram of a wastewater treatment device for green environmental electrophoretic paint production according to an embodiment of the present invention.
FIG. 3 is a device for regenerating cation exchange resin in a wastewater treatment device for green environmental electrophoretic paint production, which is provided by the embodiment of the invention.
In the figure: 1. an anode; 2. an alkali water chamber; 3. bipolar membrane; 4. a cation exchange resin; 5. a cation exchange membrane; 6. a brine chamber; 7. and a cathode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1, the method for treating wastewater from the production of green environmental electrophoretic paint according to the embodiment of the present invention comprises the following steps:
s101: a final deionized water cleaning tank before cathode electrophoresis is provided with a precise filtering device, the filtering precision is 25 mu m, solid particles and suspended impurities are removed, the carrying amount of impurity workpieces in the electrophoresis tank is reduced, and meanwhile, cleaning water of the cleaning tank is purified, so that deionized water is saved, and the cleaning wastewater amount is reduced;
s102: the cathode electrophoresis tank is provided with a two-stage filtering device of rough filtering and fine filtering, so that solid particle impurities in the electrophoresis tank liquid are removed, and the blockage of an ultrafiltration membrane is reduced; the electrophoresis tank, the post-electrophoresis cleaning tank and the deionized water cleaning tank are provided with ultrafiltration devices, ultrafiltration penetrating fluid enters a fluid storage tank, the fluid storage tank is provided with a reverse osmosis device, the reverse osmosis penetrating fluid is used as cleaning water for the post-electrophoresis deionized water cleaning tank, ultrafiltrate in the fluid storage tank is pumped to a cation exchange tank, metal ions are removed by a cation exchange resin device and then used as spraying water for a spraying tank II, a bipolar membrane electrodialysis device is adopted for cation exchange resin regeneration, a large amount of acid-base regeneration materials are not used, and secondary water pollution caused by acid-base and the like is avoided;
s103: the spraying and cleaning water after electrophoresis is recycled to the electrophoresis tank by adopting a multi-stage recovery method, and no cleaning wastewater is generated in the whole process of electrophoresis production. The precision filter, the ultrafiltration membrane and the reverse osmosis membrane are provided with special cleaning tanks and need to be cleaned regularly, and when the ultrafiltration membrane and the reverse osmosis membrane are cleaned, the resin is firstly washed back to the equipment using tank by deionized water, so that the waste of resin materials and the discharge of harmful substances are reduced;
s104: the method comprises the steps of intensively discharging clear bottom water of electrophoresis production process tanks such as equipment cleaning water and a small amount of liquid storage tanks to an electrophoresis wastewater tank, adding lime milk, adjusting the pH value to 6.5-7.0, adding a PMA flocculant, slowly stirring, precipitating, pumping supernatant, discharging through sand filtration, allowing precipitates and flocculants to enter a sludge tank, performing filter pressing and curing treatment, and completely enabling COD (chemical oxygen demand) of the discharged wastewater to reach the discharge standard specified by the national environmental protection department.
As shown in fig. 2, the wastewater treatment apparatus for green environmental electrophoretic paint production according to the embodiment of the present invention includes: the device comprises a first deionized water cleaning tank, an electrophoresis tank, a cleaning tank, a spraying tank, a liquid storage tank, a cation exchange tank, a second deionized water cleaning tank, a device cleaning tank, a transition tank, a wastewater tank, a reaction tank and a sand filter tank. Cleaning water of 6 production process tanks, namely a first deionized water cleaning tank, a cathode electrophoresis tank, a spraying tank I, a cleaning tank, a spraying tank II and a second deionized water cleaning tank, is finally recycled to the cathode electrophoresis tank by adopting a step-by-step recovery method; the first deionization cleaning tank filter is circularly filtered through a water inlet pipe and a water outlet pipe; the cathode electrophoresis tank liquid is pumped to a transition tank through rough filtration by a pipeline and pumped back to the cathode electrophoresis tank through fine filtration by a pipeline; the cathode electrophoresis tank liquid is circularly treated by an ultrafilter through a pipeline, and the ultrafiltrate is discharged to a liquid storage tank through a pipeline; the spray water of the spray tank is circulated by a water pump through a pipeline; cleaning water of the cleaning tank circulates through an ultrafilter through a pipeline, and ultrafiltrate is discharged to a liquid storage tank through the pipeline; circulating the second deionized water cleaning tank through an ultrafilter through a pipeline, and discharging ultrafiltrate to a liquid storage tank; the liquid in the liquid storage tank is subjected to reverse osmosis circulation through a pipeline, and the reverse osmosis liquid is discharged to the second deionized water cleaning tank through the pipeline; pumping the liquid in the liquid storage tank to a cation exchange tank through a water pump, circulating through cation exchange resin through a pipeline, removing metal ions, and pumping to a spraying tank II through the water pump for recycling; cleaning water of the equipment cleaning tank is directly discharged to a wastewater tank, the wastewater tank is pumped to a reaction tank by a water pump for treatment, and supernatant is pumped to a sand filter by the water pump and is directly discharged by sand filtration; the sediment and the floc are pumped into a sludge tank by a sludge pump for pressure filtration treatment.
The device comprises a deionized water cleaning tank before cathode electrophoresis, a spraying tank I, a cleaning tank, a spraying tank II, a deionized water cleaning tank, a wastewater tank, a reaction tank and a sand filter tank, wherein the deionized water cleaning tank is a tank for cathode electrophoresis production, the wastewater tank is a final treatment device for electrophoresis production discharge wastewater, the filter, rough filtration, fine filtration, a transition tank, an ultrafilter, a liquid storage tank, a cation exchange tank, cation exchange resin, reverse osmosis and an equipment cleaning tank are additionally arranged for electrophoresis production, and the purpose is to reduce the consumption of electrophoresis cleaning deionized water, reduce the discharge amount of cleaning wastewater, realize zero discharge of wastewater, recycle cleaning water to the electrophoresis tank, improve the utilization rate of an electrophoresis material and achieve more than 98%.
As shown in fig. 3, the cation exchange resin regeneration device of the green environmental protection electrophoretic paint production wastewater treatment device of the embodiment of the invention; the anode 1 is connected with the positive pole of a power supply, before regeneration, brine is firstly placed in the brine chamber 2, cation exchange resin 4 is placed in the brine between the bipolar membrane 3 and the cation exchange membrane 5, a cathode 7 is placed in the brine chamber 6, and the cathode 7 is connected with the negative pole of the power supply.
Under the action of the external direct current, water in the middle layer of the bipolar membrane 3 is ionized to generate H required by the regeneration of the cationic resin 4+Ions and regenerated metal impurity ions selectively enter the brine chamber 6 through the cation exchange membrane 5 to be concentrated, and OH generated by ionization-Ions enter an alkaline water chamber to be concentrated and can be used as alkali for pretreatment in electrophoresis production, graphite is used as an anode 1 for electrodialysis, stainless steel is used as a cathode 2, the voltage of a bipolar membrane electrodialysis direct current power supply is 10-40 v, the current is 1.5-4A, dilute brine is added during electrolysis to be used as conductive salt, and the temperature is room temperature. The bipolar membrane electrodialysis device is adopted to regenerate the cation exchange resin, so that the method is economical and environment-friendly.
The application principle of the invention is as follows:
the invention adds a circulating filter device in a deionized water rinse tank before electrophoresis; the electrophoresis tank adopts two-stage filtration devices of rough filtration and fine filtration, the rough filtration aperture is 50um, the fine filtration aperture is 25um, and solid suspended impurities in the tank liquor are removed in a grading way, so that the removal efficiency is improved, the filtration device, a subsequent ultrafiltration membrane and a subsequent reverse osmosis membrane are not easy to block, the cleaning period can be prolonged, and the generation of cleaning wastewater is reduced; the electrophoresis tank adopts an ultrafiltration device, and ultrafiltration discharge water enters a liquid storage tank; the post-electrophoresis cleaning adopts a multi-stage recovery cleaning mode of two groups of spraying tanks and a cleaning tank, the cleaning tank is provided with an ultrafiltration device, the solid components such as electrophoresis resin and the like are recovered, the material utilization rate is improved, and ultrafiltration discharge water enters a liquid storage tank; the deionized water cleaning tank after electrophoresis is provided with an ultrafiltration device, and ultrafiltration discharge water enters a liquid storage tank; collecting water by the liquid storage tank, pumping the water to a cation exchange tank, arranging a cation resin exchange device, removing metal ion impurities, and recycling the water to the spraying tank II; the reservoir is additionally provided with a reverse osmosis device, and the permeation water is recycled to the deionized water cleaning tank.
The ultrafiltration system is cleaned by adding special cellosolve and neutralizer into the pure water, and the operating temperature of the ultrafiltration system is controlled at 25-35 ℃.
The aperture of the reverse osmosis membrane is thinner than that of the ultrafiltration membrane, the reverse osmosis membrane cannot be directly used in electrophoretic coating, ultrafiltrate is treated, smaller resin molecules and dissolved salts are intercepted, the recovery rate of electrophoretic paint can be improved, and the consumption of deionized water is reduced. The working parameters are controlled well in the using process, the reverse osmosis membrane is cleaned regularly, and the using temperature is not more than 50 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The utility model provides a waste water treatment device of waste water treatment method of green electrophoresis lacquer production which characterized in that, waste water treatment device includes: the device comprises a first deionized water cleaning tank, a cathode electrophoresis tank, a cleaning tank, a spraying tank I, a spraying tank II, a liquid storage tank, a cation exchange tank, a second deionized water cleaning tank, a device cleaning tank, a transition tank, a wastewater tank, a reaction tank and a sand filter tank;
cleaning water of 6 production process tanks, namely a first deionized water cleaning tank, a cathode electrophoresis tank, a spraying tank I, a cleaning tank, a spraying tank II and a second deionized water cleaning tank, is finally recycled to the cathode electrophoresis tank by adopting a step-by-step recovery method; the first deionized water cleaning tank filter is circularly filtered through a water inlet pipe and a water outlet pipe; the cathode electrophoresis tank liquid is pumped to a transition tank through rough filtration by a pipeline and pumped back to the cathode electrophoresis tank through fine filtration by a pipeline; the cathode electrophoresis tank liquid is circularly treated by an ultrafilter through a pipeline, and the ultrafiltrate is discharged to a liquid storage tank through a pipeline; the spray water of the spray tank is circulated by a water pump through a pipeline; cleaning water of the cleaning tank circulates through an ultrafilter through a pipeline, and ultrafiltrate is discharged to a liquid storage tank through the pipeline; circulating the second deionized water cleaning tank through an ultrafilter through a pipeline, and discharging ultrafiltrate to a liquid storage tank; the liquid in the liquid storage tank is subjected to reverse osmosis circulation through a pipeline, and the reverse osmosis liquid is discharged to the second deionized water cleaning tank through the pipeline; pumping the liquid in the liquid storage tank to a cation exchange tank through a water pump, circulating through cation exchange resin through a pipeline, removing metal ions, and pumping to a spraying tank II through the water pump for recycling; cleaning water of the equipment cleaning tank is directly discharged to a wastewater tank, the wastewater tank is pumped to a reaction tank by a water pump for treatment, and supernatant is pumped to a sand filter by the water pump and is directly discharged by sand filtration; the sediment and the floc are pumped into a sludge tank by a sludge pump for filter pressing treatment;
the first deionized water cleaning tank before electrophoresis is provided with a circulating filter with the filtering precision of 25 mu m, and the second deionized water cleaning tank after electrophoresis is provided with an ultrafilter;
the cathode electrophoresis tank is provided with an ultrafiltration machine, and two-stage circulating filters of coarse filtration and fine filtration are adopted simultaneously, wherein the coarse filtration precision is 50 mu m, and the fine filtration precision is 25 mu m;
the cleaning tank is provided with an electrophoretic paint ultrafilter;
the reservoir is provided with a reverse osmosis system for electrophoresis production and cleaning;
the cation exchange tank is provided with a cation resin exchanger, and the cation exchange resin is provided with a bipolar membrane electrodialysis method regeneration device;
the bipolar membrane electrodialysis regeneration device is provided with an anode, the anode is connected with the positive electrode of a power supply, brine is placed in an alkaline water chamber before regeneration, cation exchange resin is placed in the brine between the bipolar membrane and the cation exchange membrane, a cathode is placed in the brine chamber, and the cathode is connected with the negative electrode of the power supply.
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| CN108298739A (en) * | 2018-01-31 | 2018-07-20 | 常州市武进天工机械制造有限公司 | Electrophoretic paint waste water processing method |
| CN110129861A (en) * | 2019-06-26 | 2019-08-16 | 吉安特膜分离设备(长春)有限公司 | Bi-membrane method electrophoretic painting cleans Sewage treatment technology |
| CN111056658A (en) * | 2019-12-31 | 2020-04-24 | 枣阳市旺前电泳涂料有限公司 | Method for recycling electrophoresis wastewater |
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| JPH09170098A (en) * | 1995-12-19 | 1997-06-30 | Toyota Motor Corp | Treatment of waste liquid |
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