Process flow of electroplating wastewater treatment project?

Electroplating industry overview

The electroplating industry is one of the three major polluting industries in the world. The electroplating industry is currently developing rapidly, and the pollution caused by electroplating wastewater to the environment is quite serious. The nation’s electroplating industry produces about 4 billion m³ of wastewater every year, which severely exacerbates the shortage of water sources and restricts the sustainable development of the electroplating industry in my country. Implement cleaner production in the electroplating industry, change the components of the plating solution, and modify the cleaning methods and equipment to reduce waste water discharge and pollutant concentration.

Electroplating wastewater water quality

As long as electroplating wastewater includes plating parts rinse water, waste bath liquid, cooling water, etc., it is generally divided into cyanide wastewater, wastewater (20-70mg/L) containing chromium-containing wastewater (20-100mg/L) and heavy metals, acid and alkali. Waste water system. The flow of wastewater varies with production scale and process.
Electroplating wastewater contains a large amount of toxic and harmful substances such as hydrochloric acid, zinc, copper, heavy metals, organic brighteners, etc., which is mixed with other pretreatments to form comprehensive wastewater. Chemical reaction additives and flocculants (PAV, PAM) are used to remove residues in wastewater. Heavy metals, after biochemical reaction and membrane treatment technology, the effluent reaches the standard discharge process.

Application of membrane technology in electroplating wastewater

Membrane bioreactor treatment of electroplating wastewater has the advantages of low energy consumption, no pollution, high concentration ratio, etc. Membrane integration technology is used for electroplating wastewater treatment inactive, causing secondary pollution, recycling harmful metals in wastewater, and reusing resources.

The benefits of membrane treatment of electroplating wastewater

  1. 1Can be used for metal ions;
  2. Wastewater reuse, reduce the amount of rinsing water to achieve further treatment and discharge, reduce the scale of biochemical, physical and chemical treatment;
  3. Membrane effluent water quality is good, the system is easy to operate, and it occupies a small area;
  4. The investment recovery period is short.

Current status of electroplating wastewater treatment technology

Cyanide-containing wastewater treatment equipment

  1. Alkaline cyanide method: Alkaline cyanide method oxidizes cyanide in two stages. Under alkaline conditions, add oxidant to react cyanide ion into CO2 and N2 through two-stage oxidation, so as to achieve the purpose of removing cyanide ion. ;
  2. Electrolysis method: mainly suitable for high-concentration wastewater containing cyanide. The ferrite method is used to treat chromium-containing wastewater, using FeSO4 as a reducing agent to reduce Cr6+ to Cr3+, adding alkali to co-precipitate Cr3+ and other heavy metal ions to produce liters of M(OH)n.Fe(OH)3, and then pass it through the air , Heating, aging, etc., eventually forming ferrite
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