The treatment of wastewater or wastewater discharged from electroplating production. The wastewater and wastewater discharged from electroplating factories contain a large amount of metal ions such as chromium, pickaxe, nickel, cyanide, acid, alkali, and usually contain organic additives. Metal ions exist in the form of simple cations, acid anions, and complex complex ions. Common chemical methods for the treatment of electroplating wastewater include neutralization precipitation method, mixed coagulation precipitation method, oxidation method, reduction method, barium salt method, ferrite method, etc. The chemical method equipment is simple, low investment, and widely used, but often leaves sludge that needs to be further solved. The wastewater generated by the electroplating industry contains a large amount of harmful substances, causing great harm to the environment. To address this issue, some electroplating wastewater treatment companies have adopted zero discharge processes, which fundamentally reduce the generation and discharge of wastewater.

1. Preprocessing

The zero discharge process adopted by the electroplating wastewater treatment company first carries out pre-treatment of the wastewater, including physical and chemical treatment. Physical treatment usually involves removing suspended substances such as oil, sludge, etc. from wastewater. Chemical treatment is based on the characteristics of different pollutants in wastewater, such as ammonia nitrogen, heavy metals, etc.

2. Photocatalytic oxidation technology

Photocatalytic oxidation technology is an efficient wastewater treatment technology widely used in the field of electroplating wastewater treatment. It can use the energy of sunlight to activate titanium dioxide, generate hydrogen oxygen free radicals and superoxide free radicals, to oxidize and decompose harmful substances in wastewater. Due to its environmental friendliness, high efficiency, and zero emissions, this technology is widely used in the wastewater treatment of electroplating wastewater enterprises.

3. Ion exchange technology

Electroplating wastewater contains a lot of heavy metal ions, which is a difficult problem to solve. Ion exchange technology can effectively remove these ions. Ion exchange technology utilizes the characteristics of electrical grade plastics to exchange some ions with cations or cations in wastewater, thereby achieving the effect of removing heavy metal ions from wastewater.

Membrane separation technology

Electroplating wastewater treatment enterprises can also choose membrane separation technology to achieve zero discharge of wastewater. Membrane separation technology can be divided into microfiltration, ultrafiltration, nanofiltration, and reverse osmosis technologies, which can achieve the separation of solutes in wastewater and the recovery of wastewater. Compared with traditional methods, membrane separation technology has the characteristics of high efficiency, no secondary pollution, and small footprint.

Electroplating wastewater treatment enterprises can achieve zero discharge of wastewater. Based on efficient pre-treatment, photocatalytic oxidation technology, ion exchange technology, and membrane separation technology, the generated wastewater can be treated to meet environmental protection standards for secondary utilization of production and domestic water, achieving the effect of waste resource utilization and resource utilization, greatly saving the company's production costs and slowing down environmental pollution levels.

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