CN110683716A - Wastewater treatment process for wastewater generated by automobile accessory coating production line - Google Patents
Wastewater treatment process for wastewater generated by automobile accessory coating production line Download PDFInfo
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Abstract
A waste water treatment process for waste water generated in an automobile accessory coating production line comprises the treatment of comprehensive waste water and the treatment of phosphating waste water; the comprehensive wastewater treatment comprises sewage treatment and sludge treatment. The waste water treatment process for the waste water generated by the automobile accessory coating production line, provided by the invention, has the advantages that the waste water generated by different working procedures is classified, the effect is better according to local conditions, the comprehensiveness and the accuracy of waste water treatment are reflected, zero pollution and zero emission are realized, the economic benefit and the environmental benefit are extremely high, the operation is convenient, toxic and harmful byproducts are not generated in the treatment engineering, the pollution is avoided, the treated waste water is clear, the treated effluent meets the water quality requirement of production water, the water recovery rate can reach more than 95%, and the prospect is wide.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment process for wastewater generated by an automobile accessory coating production line.
Background
The development of the automobile industry greatly changes the life style of human beings, promotes the development of the world economy and the progress of the human society, and is indispensable. However, human society enjoys automobile civilization and suffers from serious environmental pollution caused by the automobile industry. Facing to the huge pressure of shortage of ecological resources and deterioration of environmental conditions, countries are more and more consciously aware that the improvement of environmental protection level of the automobile industry directly influences the sustainable development of the automobile industry and plays an important role in the sustainable development of human society. In recent years, the automobile industry in China has developed rapidly, and the yield has climbed, and the automobile industry can be called a highly polluted industry in terms of resource occupation, emission to the environment or influence on human health.
Automobile painting is an important link in the automobile manufacturing process. The modern automobile manufacturing process is generally divided into four process links, namely a part stamping process, an automobile body assembling process, an automobile body coating process and an assembly assembling process. In the automobile coating process, the generation and discharge amount of wastes are huge, and the wastes are various, including solid wastes, liquid wastes, gas wastes, waste heat energy and the like. Improper treatment of the waste can cause pollution to air quality, groundwater quality, soil environment, nature, crop environment, and the like.
Therefore, it is a practical subject to which people are confronted to solve the environmental problem of the waste water generated by the automobile part coating line scientifically and reasonably by aiming at the waste water generated by the automobile part coating line. Therefore, a wastewater treatment process for treating wastewater generated by an automobile part coating production line needs to be provided, so as to establish a harmonious society, keep harmonious coexistence between people and nature, and realize sustainable development of society and economy, so as to pursue comprehensive optimization of environmental benefits and economic benefits of enterprises, and realize sustainable development of enterprises.
Chinese patent application No. CN201510715365.7 discloses an automobile manufacturing wastewater treatment system, which is used for separating and recycling automobile manufacturing wastewater to improve the recycling effect of the automobile manufacturing wastewater, mainly plays a role in separation, and does not treat the wastewater.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the waste water treatment process for the waste water generated in the automobile accessory coating production line, the waste water generated in different working procedures is classified and treated, the effect is better according to local conditions, the comprehensiveness and the accuracy of waste water treatment are reflected, zero pollution and zero emission are realized, the process has extremely high economic benefit and environmental benefit, the operation is convenient, toxic and harmful byproducts are not generated in the treatment engineering, no pollution is caused, the treated waste water has clear water quality, the treated effluent meets the water quality requirement of production water, the water recovery utilization rate can reach more than 95 percent, and the prospect is wide.
The purpose of the invention is realized by the following technical scheme:
a wastewater treatment process for wastewater generated by an automobile accessory coating production line is characterized by comprising the steps of treating comprehensive wastewater and treating phosphating wastewater; the treatment of the comprehensive wastewater comprises sewage treatment and sludge treatment; the sewage treatment comprises the following steps:
(1) demulsification pretreatment: collecting waste liquid of a degreasing process, then feeding the waste liquid into a degreasing waste liquid tank, slowly lifting the waste liquid to an oil separation tank by a degreasing waste liquid pump, performing emulsion breaking pretreatment by an acidification method, floating oil floats on the surface of the oil separation tank, manually fishing and collecting the floating oil to an oil collecting barrel, and feeding the remaining waste liquid, degreasing overflow water and pickling process waste water into a waste water regulating tank;
(2) air flotation oil removal: conveying the waste liquid in the waste water adjusting tank into a reaction tank by a corrosion-resistant chemical pump, adding alkali liquor into the reaction tank, adjusting the pH to be neutral, then feeding the waste liquid into a first coagulation tank, adding a demulsifier and a coagulant aid into the first coagulation tank, carrying out first scum separation, then discharging water into an air flotation tank, starting an air flotation oil removing machine, forming a stable scum layer on the liquid surface, and scraping by a scum scraper to carry out second scum separation;
(3) coagulating sedimentation: the effluent of the air flotation tank enters a second coagulation tank, alkali liquor is added into the second coagulation tank, the pH value is adjusted to 8-9, a coagulant is added at the same time to flocculate into a larger combination, the effluent enters a primary sedimentation tank, and a high-efficiency precipitator of the primary sedimentation tank carries out solid-liquid sedimentation separation;
(4) biochemical treatment: and (4) enabling supernatant effluent after precipitation to enter a biochemical system for treatment, adding a glucose solution into the biochemical system to serve as a nutrient source, and adjusting the B/C ratio to be more than 0.4.
The wastewater treatment process for the wastewater generated by the automobile accessory coating production line, provided by the invention, is used for carrying out classification treatment on the wastewater generated in different processes, including comprehensive wastewater treatment and phosphating wastewater treatment. Wherein, the wastewater generated in the acid washing process and the degreasing process is comprehensive wastewater, and the main pollutants in the comprehensive wastewater are emulsified oil, a surfactant, water-soluble resin, pigment, a cosolvent, a degreasing agent, hydrochloric acid and sulfuric acid; the waste water generated in the phosphorization treatment process is phosphorization waste water, and main pollutants in the phosphorization waste water are pollutants such as phosphate, zinc ions, acid and alkali substances, organic matters, surfactants and the like.
The comprehensive wastewater treatment of the invention comprises sewage treatment and sludge treatment, embodies the comprehensiveness of wastewater treatment, has zero pollution and zero discharge, and has extremely high economic benefit and environmental benefit. Wherein, the sewage treatment has reasonable process, convenient operation and good treatment effect. The degreasing waste liquid and the pickling waste water are separately treated according to local conditions, and the effect is better.
The air floatation in the air floatation oil removing machine adopts a mixed flow pump to pump the treated clean water, simultaneously pumps to suck air, mixes the air with the clean water, utilizes an impeller to rotate at a high speed, stirs to form a steam-water mixture, presses the steam-water mixture into an air floatation release bin, and then contacts with scum in sewage; because the scum is hydrophobic, the scum is contacted with the micro bubbles released suddenly to form a stable scum layer which floats to the liquid level and is scraped by a scum scraper after being accumulated to a certain thickness.
Further, in the wastewater treatment process for wastewater generated in the automobile part coating production line, the demulsification pretreatment is to add H into an oil separation tank2SO4The pH is adjusted to 2-3.
The demulsification pretreatment ensures that the anionic surfactant in the degreasing waste liquid is easy to decompose in an acid solution and loses stability, and the original balance of oleophylicity and hydrophilcity is lost, thereby achieving the purpose of demulsification.
Further, in the wastewater treatment process for wastewater generated by the automobile accessory coating production line, the demulsifier in the air floatation oil removal is a mixture of alkyl phenolic resin, polyoxyethylene and polyoxypropylene; the coagulant aid is a mixture of polyacrylamide, activated silicic acid and sodium alginate; the coagulant in the coagulating sedimentation is a mixture of polyacrylamide, polyamide, aluminum sulfate and ferric chloride.
The demulsifier, coagulant aid and coagulant flocculate suspended matter impurities and phosphide produced by Chinese catalytic reaction of waste water into a larger combination body which is convenient to remove.
Further, the biochemical treatment process for the wastewater generated by the automobile accessory coating production line comprises the following steps:
(1) enabling supernatant effluent after precipitation to enter a hydrolysis acidification tank, filling biological filler in the hydrolysis acidification tank, and growing anaerobic microorganisms on the biological filler;
(2) the effluent of the hydrolysis acidification tank enters a contact oxidation tank, an elastic filler is arranged in the contact oxidation tank, aerobic microorganisms grow on the biological filler, and the dissolved oxygen of the contact oxidation tank is controlled to be more than 3.0 g/l;
(3) the effluent of the contact oxidation tank enters a primary sedimentation tank for sedimentation, and the primary sedimentation tank adopts a microporous aeration head for aeration;
(4) conveying the water in the primary sedimentation tank to a pH adjusting tank through a lifting pump, adjusting the pH value to be neutral, then discharging the water into a third coagulation tank, adding a coagulant aid and a coagulant into the third coagulation tank, and allowing the water and the coagulant to enter a secondary sedimentation tank for sedimentation so as to separate mud and water;
(5) and the effluent of the secondary sedimentation tank enters a clean water tank, a pH meter is installed in the clean water tank, a sulfuric acid dosing pipeline is connected, the pH value of the effluent is ensured to be 7-8, finally the effluent is discharged in a qualified mode, the qualified effluent enters a discharge tank, and the effluent is discharged to a plant area drainage pipe network from the discharge tank if the qualified effluent is detected.
The biochemical treatment has good sewage treatment effect, realizes zero discharge of sewage, does not produce toxic and harmful byproducts in treatment engineering, has no pollution, and ensures that the treated waste water has clear water quality. Wherein, the hydrolysis acidification tank is filled with biological filler, and a large amount of anaerobic microorganisms grow on the biological filler and mainly play a role of a carrier for adsorbing and decomposing organic matters. Most of high-concentration organic matters can be degraded by using anaerobic bacteria. Gases such as CH4 and N2 formed by decomposition of organic substances; the contact oxidation pond adopts a biological contact oxidation method, and the method has the advantages of high biomass, large volume load, strong impact load resistance, no sludge expansion, small residual sludge amount, stable treatment effect, convenient operation and management and the like. Novel elastic filler is arranged in the contact oxidation pond and is used as a carrier of aerobic microorganisms, the specific surface area of the filler is large, the filler is easy to hang and release films, and the filler has certain flexibility and elasticity and is not easy to agglomerate. And the effluent of the contact oxidation tank enters a sedimentation tank for sedimentation. The aeration adopts a microporous aeration head, and the aeration head is never blocked, ageing-resistant and corrosion-resistant.
Further, the above-mentioned wastewater treatment process for wastewater produced by the automobile accessory coating production line comprises the following steps: and discharging the precipitated sludge in the primary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank to a sludge tank, pumping the sludge to a plate-and-frame filter press for sludge-water separation, and transporting and treating the sludge cakes outside.
Further, the treatment of the phosphating wastewater by the wastewater treatment process for the wastewater generated by the automobile accessory coating production line comprises the following steps:
(1) flocculating and precipitating, namely collecting the phosphorization wastewater by a wastewater collection tank, adjusting the pH value to 10-11 in the wastewater collection tank, adding a flocculating agent and a coagulant, feeding the effluent into a precipitation tank for sludge-water separation, discharging the sludge at the lower part of the precipitation tank into a sludge tank at regular time, pumping the sludge into a plate-and-frame filter press by a sludge pump, dewatering the sludge, and performing external treatment;
(2) filtering by using multiple media: the outlet water of the clean water tank enters a multi-medium filtering system for filtering;
(3) film treatment: after being filtered by the multi-medium filtering system, the wastewater enters a membrane treatment system, and a scale remover and a bactericide are added into the membrane treatment system;
(4) triple-effect evaporation: and after being treated by the membrane treatment system, the wastewater enters a triple-effect evaporation desalting system, mother liquor and crystals are separated, the mother liquor returns to the triple-effect evaporation desalting system to continue evaporation, and the separated crystals are subjected to solid waste treatment.
The treatment of the phosphating wastewater has reasonable treatment steps and good effect, the finally treated effluent meets the water quality requirement of the process water, and the recovery rate of the water can reach more than 95 percent.
Further, foretell a waste water treatment process for produced waste water of auto-parts coating line, many medium filtration system includes that filter pump, quartz sand filter jar, active carbon filter jar, filter pump, quartz sand filter jar, active carbon filter jar connect gradually.
The water in the clean water tank sequentially enters a quartz sand and active carbon filter tank through a filter pump for filtering, and large particle suspended matters and oils in the water are removed.
Further, the membrane treatment system comprises a UF unit, a UF water production barrel, a primary RO unit, a primary concentrated water barrel and a secondary RO unit, wherein the UF unit, the UF water production barrel, the primary RO unit, the primary concentrated water barrel and the secondary RO unit are sequentially connected.
The main components of the UF unit, the primary RO unit and the secondary RO unit are a UF membrane, a primary RO membrane and a secondary RO membrane. The UF unit is a membrane separation device capable of purifying and separating solution, and the UF membrane is used as a filter medium, and the pressure difference between two sides of the membrane is used as a driving force. The UF membrane only allows the solvent (such as water molecules), inorganic salt and small molecular organic matters in the solution to permeate, but retains suspended substances, colloids, proteins, microorganisms and other macromolecular substances in the solution, thereby achieving the purposes of purification and separation. The RO unit is a membrane separation and filtration device which uses osmotic pressure difference as power, the membrane aperture of the RO membrane is as small as nanometer (1 nanometer =10 x-9 m), under a certain pressure, water molecules can pass through the RO membrane, and impurities such as inorganic salt, heavy metal ions, organic matters, colloid, bacteria, virus and the like in source water cannot pass through the RO membrane, so that permeable pure water and impermeable concentrated water are strictly distinguished.
Further, the treatment process of the membrane treatment system for the wastewater generated by the automobile accessory coating production line comprises the following steps: and the wastewater filtered by the multi-medium filtering system enters the UF unit, a UF water production barrel, a primary RO unit, a primary concentrated water barrel and a secondary RO unit, after filtering and concentrating, the produced water enters a reuse water barrel for reuse, and the secondary concentrated water is discharged into a secondary concentrated water barrel and then enters the triple-effect evaporation desalination system.
Further, in the wastewater treatment process for wastewater generated by the automobile accessory coating production line, the triple-effect evaporation desalting system comprises a triple-effect evaporator, a cooling tower, a discharge pump, a cooling water bucket and a centrifugal machine, wherein the triple-effect evaporator is respectively connected with the cooling tower and the cooling water bucket; the triple-effect evaporator, the discharge pump and the centrifuge are sequentially connected.
The working principle of the triple-effect evaporation desalination system is as follows: the second-stage concentrated water in the second-stage concentrated water bucket enters a triple-effect evaporator for evaporation, the evaporated primary steam enters a first-effect heater of the triple-effect evaporator, the secondary steam enters a second-effect heater and a triple-effect heater of the triple-effect evaporator, the feed liquid is heated and boiled and is continuously sprayed into the evaporator, the feed liquid is reduced by gas-liquid separation and gravity difference, and the feed liquid flows into the heater through a circulating pump to form forced circulation. The tertiary steam generated by the feed liquid in the evaporator is used as the heat source of the triple-effect heater.
The tail gas is condensed by a cooling tower, the condensed water is discharged by a cooling water bucket, the condensed non-condensable gas is pumped away by a vacuum pump of the cooling tower, the vacuum pump controls the vacuum degree of each device by a pipeline and a valve, when the magma material reaching the saturated concentration in the triple-effect evaporator is discharged to a centrifugal machine by a discharge pump, the centrifugal machine separates out crystals, the mother liquor returns to the triple-effect evaporator to continue to evaporate, and the separated crystals are treated by solid waste.
Compared with the prior art, the invention has the following beneficial effects: the waste water treatment process for the waste water generated by the automobile accessory coating production line, disclosed by the invention, has the advantages of reasonable step arrangement, capability of carrying out classification treatment on the waste water generated in different working procedures according to local conditions, better effect and simple process, embodies the comprehensiveness and accuracy of waste water treatment, realizes zero pollution and zero emission of the waste water, does not generate toxic and harmful byproducts in the treatment engineering, is pollution-free, has extremely high economic benefit and environmental benefit, the treated waste water has clear water quality, the treated effluent meets the water quality requirement of production water, the recovery rate of the water can reach more than 95%, and the application prospect is wide.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to specific experimental data, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following embodiment provides a wastewater treatment process for wastewater generated by an automobile part coating production line, which comprises the steps of treating comprehensive wastewater and treating phosphating wastewater; the comprehensive wastewater treatment comprises sewage treatment and sludge treatment.
Further, the biochemical system adds glucose solution as a nutrient source and adjusts the B/C ratio to be more than 0.4.
Further, the demulsifier in the air floatation oil removal is a mixture of alkyl phenolic resin, polyoxyethylene and polyoxypropylene; the coagulant aid is a mixture of polyacrylamide, activated silicic acid and sodium alginate; the coagulant in the coagulating sedimentation is a mixture of polyacrylamide, polyamide, aluminum sulfate and ferric chloride.
Furthermore, multi-media filtration system filters jar, active carbon and filters the jar including filtering pump, quartz sand, filter the jar, filter pump, quartz sand filter the jar, active carbon filters the jar and connects gradually.
Furthermore, the membrane treatment system comprises a UF unit, a UF water production barrel, a primary RO unit, a primary concentrated water barrel and a secondary RO unit, wherein the UF unit, the UF water production barrel, the primary RO unit, the primary concentrated water barrel and the secondary RO unit are sequentially connected.
Further, the triple-effect evaporation desalination system comprises a triple-effect evaporator, a cooling tower, a discharge pump, a cooling water bucket and a centrifugal machine, wherein the triple-effect evaporator is respectively connected with the cooling tower and the cooling water bucket; the triple-effect evaporator, the discharge pump and the centrifuge are sequentially connected.
Examples
(1) Treatment of integrated wastewater
1) Sewage treatment:
demulsification pretreatment: collecting waste liquid of the degreasing process, feeding the waste liquid into a degreasing waste liquid tank, slowly lifting the waste liquid to an oil separation tank by a degreasing waste liquid pump, and performing demulsification pretreatment by an acidification method, wherein the demulsification pretreatment is to add H into the oil separation tank2SO4Adjusting the pH value to 2-3, floating oil floats on the surface of the oil separation tank, the floating oil is collected into an oil collecting barrel through manual salvage, and the remaining waste liquid, degreasing overflow water and pickling process waste water enter a waste water adjusting tank;
air flotation oil removal: conveying the waste liquid in the waste water adjusting tank into a reaction tank by a corrosion-resistant chemical pump, adding alkali liquor into the reaction tank, adjusting the pH to be neutral, then feeding the waste liquid into a first coagulation tank, adding a demulsifier and a coagulant aid into the first coagulation tank, carrying out first scum separation, then discharging water into an air flotation tank, starting an air flotation oil removing machine, forming a stable scum layer on the liquid surface, and scraping by a scum scraper to carry out second scum separation;
coagulating sedimentation: the effluent of the air flotation tank enters a second coagulation tank, alkali liquor is added into the second coagulation tank, the pH value is adjusted to 8-9, a coagulant is added at the same time to flocculate into a larger combination, the effluent enters a primary sedimentation tank, and a high-efficiency precipitator of the primary sedimentation tank carries out solid-liquid sedimentation separation;
biochemical treatment: enabling supernatant effluent after precipitation to enter a hydrolysis acidification pool of a biochemical system, filling biological fillers in the hydrolysis acidification pool, and growing anaerobic microorganisms on the biological fillers; the effluent of the hydrolysis acidification tank enters a contact oxidation tank, an elastic filler is arranged in the contact oxidation tank, aerobic microorganisms grow on the biological filler, and the dissolved oxygen of the contact oxidation tank is controlled to be more than 3.0 g/l; the effluent of the contact oxidation tank enters a primary sedimentation tank for sedimentation, and the primary sedimentation tank adopts a microporous aeration head for aeration; conveying the water in the primary sedimentation tank to a pH adjusting tank through a lifting pump, adjusting the pH value to be neutral, then discharging the water into a third coagulation tank, adding a coagulant aid and a coagulant into the third coagulation tank, and allowing the water and the coagulant to enter a secondary sedimentation tank for sedimentation so as to separate mud and water; and the effluent of the secondary sedimentation tank enters a clean water tank, a pH meter is installed in the clean water tank, a sulfuric acid dosing pipeline is connected, the pH value of the effluent is ensured to be 7-8, finally the effluent is discharged in a qualified mode, the qualified effluent enters a discharge tank, and the effluent is discharged to a plant area drainage pipe network from the discharge tank if the qualified effluent is detected.
2) Treatment of sewage
And discharging the precipitated sludge in the primary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank to a sludge tank, pumping the sludge to a plate-and-frame filter press for sludge-water separation, and transporting and treating the sludge cakes outside.
(2) Treatment of phosphating wastewater
Flocculating and precipitating, namely collecting the phosphorization wastewater by a wastewater collection tank, adjusting the pH value to 10-11 in the wastewater collection tank, adding a flocculating agent and a coagulant, feeding the effluent into a precipitation tank for sludge-water separation, discharging the sludge at the lower part of the precipitation tank into a sludge tank at regular time, pumping the sludge into a plate-and-frame filter press by a sludge pump, dewatering the sludge, and performing external treatment;
filtering by using multiple media: the effluent of the clean water tank sequentially enters a quartz sand and activated carbon filter tank through a filter pump for filtering, and large-particle suspended matters and oils in the water are removed;
film treatment: after being filtered by the multi-medium filtering system, the mixed solution enters the UF unit, a UF water production barrel, a primary RO unit, a primary concentrated water barrel and a secondary RO unit, after being filtered and concentrated, the produced water enters a reuse water barrel for reuse, secondary concentrated water is discharged into a secondary concentrated water barrel and then enters the triple effect evaporation desalination system, and a descaling agent and a bactericide are added into the UF unit;
triple-effect evaporation: and after being treated by the membrane treatment system, the wastewater enters a triple-effect evaporation desalting system, mother liquor and crystals are separated, the mother liquor returns to the triple-effect evaporation desalting system to continue evaporation, and the separated crystals are subjected to solid waste treatment.
According to the wastewater treatment process for the wastewater generated by the automobile accessory coating production line, the finally treated effluent meets the water quality requirement of the production water, the recovery utilization rate of the water can reach 95%, the water quality is clear, the process has the advantages of wide application range and low operation cost, the wastewater is discharged without discharge through repeated reflux treatment until the effluent reaches the discharge standard, the obtained sludge and crystals are recycled, the waste can be changed into valuable, and the process has extremely high economic benefit and environmental benefit.
The preferred embodiments of the present invention have been described in detail with reference to the examples, but the present invention is not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination between the embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the idea of the present invention.
Claims (10)
1. A wastewater treatment process for wastewater generated by an automobile accessory coating production line is characterized by comprising the steps of treating comprehensive wastewater and treating phosphating wastewater; the treatment of the comprehensive wastewater comprises sewage treatment and sludge treatment; the sewage treatment comprises the following steps:
(1) demulsification pretreatment: collecting waste liquid of a degreasing process, then feeding the waste liquid into a degreasing waste liquid tank, slowly lifting the waste liquid to an oil separation tank by a degreasing waste liquid pump, performing emulsion breaking pretreatment by an acidification method, floating oil floats on the surface of the oil separation tank, manually fishing and collecting the floating oil to an oil collecting barrel, and feeding the remaining waste liquid, degreasing overflow water and pickling process waste water into a waste water regulating tank;
(2) air flotation oil removal: conveying the waste liquid in the waste water adjusting tank into a reaction tank by a corrosion-resistant chemical pump, adding alkali liquor into the reaction tank, adjusting the pH to be neutral, then feeding the waste liquid into a first coagulation tank, adding a demulsifier and a coagulant aid into the first coagulation tank, carrying out first scum separation, then discharging water into an air flotation tank, starting an air flotation oil removing machine, forming a stable scum layer on the liquid surface, and scraping by a scum scraper to carry out second scum separation;
(3) coagulating sedimentation: the effluent of the air flotation tank enters a second coagulation tank, alkali liquor is added into the second coagulation tank, the pH value is adjusted to 8-9, a coagulant is added at the same time to flocculate into a larger combination, the effluent enters a primary sedimentation tank, and a high-efficiency precipitator of the primary sedimentation tank carries out solid-liquid sedimentation separation;
(4) biochemical treatment: and (4) enabling supernatant effluent after precipitation to enter a biochemical system for treatment, adding a glucose solution into the biochemical system to serve as a nutrient source, and adjusting the B/C ratio to be more than 0.4.
2. The process of claim 1, wherein the demulsification pretreatment comprises adding H into an oil separation tank2SO4The pH is adjusted to 2-3.
3. The wastewater treatment process for wastewater generated by an automobile accessory coating production line according to claim 1, wherein the demulsifier in the air floatation oil removal is a mixture of alkyl phenolic resin, polyoxyethylene and polyoxypropylene; the coagulant aid is a mixture of polyacrylamide, activated silicic acid and sodium alginate; the coagulant in the coagulating sedimentation is a mixture of polyacrylamide, polyamide, aluminum sulfate and ferric chloride.
4. The process for the treatment of wastewater produced by the coating line of automobile accessories according to claim 1, wherein the biochemical treatment comprises the steps of:
(1) enabling supernatant effluent after precipitation to enter a hydrolysis acidification tank, filling biological filler in the hydrolysis acidification tank, and growing anaerobic microorganisms on the biological filler;
(2) the effluent of the hydrolysis acidification tank enters a contact oxidation tank, an elastic filler is arranged in the contact oxidation tank, aerobic microorganisms grow on the biological filler, and the dissolved oxygen of the contact oxidation tank is controlled to be more than 3.0 g/l;
(3) the effluent of the contact oxidation tank enters a primary sedimentation tank for sedimentation, and the primary sedimentation tank adopts a microporous aeration head for aeration;
(4) conveying the water in the primary sedimentation tank to a pH adjusting tank through a lifting pump, adjusting the pH value to be neutral, then discharging the water into a third coagulation tank, adding a coagulant aid and a coagulant into the third coagulation tank, and allowing the water and the coagulant to enter a secondary sedimentation tank for sedimentation so as to separate mud and water;
(5) and the effluent of the secondary sedimentation tank enters a clean water tank, a pH meter is installed in the clean water tank, a sulfuric acid dosing pipeline is connected, the pH value of the effluent is ensured to be 7-8, finally the effluent is discharged in a qualified mode, the qualified effluent enters a discharge tank, and the effluent is discharged to a plant area drainage pipe network from the discharge tank if the qualified effluent is detected.
5. The process for treating wastewater generated in a coating line of automobile parts according to claim 1, wherein the wastewater treatment comprises the steps of: and discharging the precipitated sludge in the primary sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank to a sludge tank, pumping the sludge to a plate-and-frame filter press for sludge-water separation, and transporting and treating the sludge cakes outside.
6. The process for treating wastewater generated in a coating line for automobile parts according to claim 1, wherein the treatment of the phosphating wastewater comprises the steps of:
(1) flocculating and precipitating, namely collecting the phosphorization wastewater by a wastewater collection tank, adjusting the pH value to 10-11 in the wastewater collection tank, adding a flocculating agent and a coagulant, feeding the effluent into a precipitation tank for sludge-water separation, discharging the sludge at the lower part of the precipitation tank into a sludge tank at regular time, pumping the sludge into a plate-and-frame filter press by a sludge pump, dewatering the sludge, and performing external treatment;
(2) filtering by using multiple media: the outlet water of the clean water tank enters a multi-medium filtering system for filtering;
(3) film treatment: after being filtered by the multi-medium filtering system, the wastewater enters a membrane treatment system, and a scale remover and a bactericide are added into the membrane treatment system;
(4) triple-effect evaporation: and after being treated by the membrane treatment system, the wastewater enters a triple-effect evaporation desalting system, mother liquor and crystals are separated, the mother liquor returns to the triple-effect evaporation desalting system to continue evaporation, and the separated crystals are subjected to solid waste treatment.
7. The wastewater treatment process for wastewater generated by the coating production line of automobile accessories as claimed in claim 6, wherein the multi-media filtration system comprises a filtration pump, a quartz sand filtration tank and an activated carbon filtration tank, and the filtration pump, the quartz sand filtration tank and the activated carbon filtration tank are connected in sequence.
8. The wastewater treatment process for wastewater generated by a coating production line of automobile accessories as claimed in claim 6, wherein the membrane treatment system comprises UF unit, UF water generating tank, primary RO unit, primary concentrated water tank, and secondary RO unit, and the UF unit, UF water generating tank, primary RO unit, primary concentrated water tank, and secondary RO unit are connected in sequence.
9. The wastewater treatment process for wastewater generated by an automobile accessory coating line according to claim 8, wherein the treatment process of the membrane treatment system comprises the following steps: and the wastewater filtered by the multi-medium filtering system enters the UF unit, a UF water production barrel, a primary RO unit, a primary concentrated water barrel and a secondary RO unit, after filtering and concentrating, the produced water enters a reuse water barrel for reuse, and the secondary concentrated water is discharged into a secondary concentrated water barrel and then enters the triple-effect evaporation desalination system.
10. The wastewater treatment process for the wastewater generated by the coating production line of the automobile accessories as claimed in claim 6, wherein the triple-effect evaporation desalting system comprises a triple-effect evaporator, a cooling tower, a discharge pump, a cooling water bucket and a centrifuge, wherein the triple-effect evaporator is respectively connected with the cooling tower and the cooling water bucket; the triple-effect evaporator, the discharge pump and the centrifuge are sequentially connected.
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| CN113429077A (en) * | 2021-06-30 | 2021-09-24 | 浙江斯科能科技股份有限公司 | Biochemical treatment process for treating high-concentration organic wastewater on metal surface |
| CN113929262A (en) * | 2021-10-18 | 2022-01-14 | 包头钢铁（集团）有限责任公司 | Waste emulsion and phosphating wastewater co-treatment system and co-treatment process thereof |
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| CN114835352A (en) * | 2022-06-15 | 2022-08-02 | 苏州苏净环保工程有限公司 | Zero-discharge treatment method for wastewater in automobile manufacturing industry |
| CN115321759A (en) * | 2022-08-29 | 2022-11-11 | 上海环境保护有限公司 | Coating wastewater purification method and purification system |
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| CN115321759A (en) * | 2022-08-29 | 2022-11-11 | 上海环境保护有限公司 | Coating wastewater purification method and purification system |
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