CN-119735268-B - Pretreatment method of electrophoresis wastewater

Abstract

The invention discloses a pretreatment method of electrophoresis wastewater, which comprises the steps of carrying out electrochemical treatment on the electrophoresis wastewater in an electrochemical reactor to obtain the treated electrophoresis wastewater. The anode plate in the electrochemical reactor is made of at least one of ruthenium iridium titanium, platinum titanium, iridium tantalum titanium, diamond, 316L stainless steel and a titanium plate, and the cathode plate in the electrochemical reactor is made of at least one of 316L stainless steel, foam nickel, a titanium mesh and a titanium plate. The pretreatment method of the electrophoresis wastewater reduces the sludge production amount, has no secondary pollution, has high and stable wastewater treatment effect, and effectively reduces the treatment cost of the electrophoresis wastewater.

Inventors

• ZHANG ZHONGGUO
• SUN HONGFANG
• ZHANG CHENHANG
• GONG CHENHAO
• ZHANG WENHAI

Assignees

• 北京市科学技术研究院资源环境研究所(北京市土地修复工程技术研究中心)

Dates

Publication Date

20260508

Application Date

20241219

Claims (10)

1. 1. A pretreatment method of electrophoresis wastewater is characterized in that electrophoresis deposition is adopted in an electrochemical reactor for coupling electrochemical oxidation of the electrophoresis wastewater to carry out electrochemical treatment, so that the treated electrophoresis wastewater is obtained, wherein the pH value of the electrophoresis wastewater is regulated to be 1.5-2 before the electrochemical treatment, organic matters in the electrophoresis wastewater are positively charged, and electrophoresis deposition occurs on a cathode.
2. 2. The method for pretreating electrophoresis wastewater of claim 1, wherein the anode plate in the electrochemical reactor comprises at least one of ruthenium iridium titanium, platinum gold titanium, iridium tantalum titanium, diamond, 316L stainless steel, and titanium plate.
3. 3. The method for pretreating electrophoresis wastewater of claim 1, wherein the material of the cathode plate in the electrochemical reactor comprises at least one of 316L stainless steel, foam nickel, titanium mesh, and titanium plate.
4. 4. The method for pretreating electrophoresis wastewater according to claim 1, wherein the anode plate in the electrochemical reactor is made of diamond, and the cathode plate is made of 316L stainless steel.
5. 5. The method for pretreating electrophoresis wastewater according to claim 1, wherein a distance between the cathode and the anode in the electrochemical reactor is 3 to 10 mm.
6. 6. The method for pretreating electrophoretic wastewater according to claim 1, wherein the electrochemical treatment voltage is 15-80V.
7. 7. The method for pretreating electrophoresis wastewater according to claim 6, wherein the electrochemical treatment voltage is 20-40V.
8. 8. The method for pretreating electrophoretic wastewater according to claim 1, wherein the electrochemical treatment voltage is a direct current constant voltage.
9. 9. The method for pretreating electrophoresis wastewater according to claim 1, wherein magnetic stirring is performed in the electrochemical reactor by using a magnetic stirrer, and the stirring speed is 600-1000 rpm.
10. 10. The method for pretreating electrophoresis wastewater according to claim 1, wherein the temperature of the electrochemical treatment is 10-30 ℃, and the time of the electrochemical treatment is 30-165 min.

Description

Pretreatment method of electrophoresis wastewater Technical Field The invention belongs to the technical field of wastewater treatment, and particularly relates to a pretreatment method of electrophoresis wastewater. Background The electrophoretic coating is a special coating film forming method developed in recent 30 years, is a construction process with the most practical significance for water-based paint, has the characteristics of water solubility, no toxicity, easy automatic control, uniform coating, high paint film hardness, corrosion resistance, impact resistance and the like, and is rapidly and widely applied in the fields of automobiles, building materials, hardware, household appliances, instruments, agricultural machinery and the like. At present, the automobile industry is rapidly developing, and the electrophoretic coating production process plays an important role in the automobile industry. In the case of electrophoretic coating, the coated vehicle body needs to be washed with a large amount of water to remove floating paint and sediment attached to the vehicle body, and the washed water is called electrophoretic waste water. The large amount of electrophoresis wastewater produced not only increases the production cost, but also causes environmental pollution. The electrophoresis waste water in the automobile industry contains a large amount of resin, pigment, filler, organic solvent and the like, and the substances exist in the waste water in the form of colloid particles or suspended matters, and have the characteristics of high indexes such as COD, SS, chromaticity and the like, various pollutant types, complex waste water components, large discharge amount, larger water quality change, irregular discharge, poor biodegradability, difficult degradation and treatment and the like. Therefore, development of a pretreatment method of electrophoresis wastewater which is low in cost, efficient and stable has been demanded. Disclosure of Invention The invention is based on the discovery and recognition of the fact that the current pretreatment method of the electrophoresis wastewater is to mix the electrophoresis wastewater, the paint spraying wastewater and the like together in proportion and then directly carry out coagulating sedimentation treatment on the mixed wastewater. The process has the characteristics of low energy consumption, moderate operation cost and less investment, but a large amount of agents are needed to be added, a large amount of sludge is generated in the treatment process, the sludge belongs to solid waste, the treatment cost is very high, the effluent quality is unstable, the emission standard is difficult to reach, and the treatment effect is not ideal. The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides the pretreatment method of the electrophoresis wastewater, which reduces the sludge production, has no secondary pollution, has high and stable wastewater treatment effect, and effectively reduces the comprehensive treatment cost of the electrophoresis wastewater. According to the pretreatment method of the electrophoresis wastewater, the electrophoresis wastewater is subjected to electrochemical treatment in the electrochemical reactor, and the treated electrophoresis wastewater is obtained. The pretreatment method of the electrophoresis wastewater provided by the embodiment of the invention has the advantages and technical effects that: 1. According to the pretreatment method provided by the embodiment of the invention, the electrophoresis wastewater is pretreated in the electrochemical reactor, and the organic matters with positive charges in the electrophoresis wastewater undergo a reduction reaction on the cathode, so that electrophoresis is deposited on the cathode, the pretreatment of the electrophoresis wastewater is realized, and the COD (chemical oxygen demand) in the wastewater is reduced; 2. The pretreatment method provided by the embodiment of the invention has the advantages that no flocculant is required to be introduced, no sludge is generated, the pretreatment is carried out on the automobile electrophoresis wastewater by adopting the method of electrophoresis deposition coupling electrochemical oxidation, the treatment method is simple in steps, low in implementation cost and good in treatment effect, the addition of a large amount of chemical agents in the coagulation deposition of the existing pretreatment technology is avoided, the sludge generation amount is greatly reduced, the treatment cost of the automobile electrophoresis wastewater is effectively reduced, and the purpose of pollution reduction and carbon reduction treatment of the electrophoresis wastewater is realized. In some embodiments, the pH of the electrophoretic wastewater after adjustment is between 1.5 and 9. In some embodiments, the material of the anode plate in the electr