Domestic sewage mainly comes from kitchen washing in canteen, toilet washing, toilet washing, etc. The generated domestic sewage generally contains more organic pollutants, such as protein, fat, starch, sugar, etc. Although in recent years, due to the reduction of the amount of detergent containing phosphorus, the phosphorus in the wastewater mainly comes from detergent, accounting for 30-75% of the total phosphorus content, the phosphorus content in the wastewater is greatly reduced due to the reduction of the phosphorus content, and the domestic sewage also contains a variety of microorganisms.

1、 Tradition Electroplating wastewater treatment equipment technology

Traditional electroplating wastewater treatment processes mainly include: chemical method, ion exchange method, membrane treatment method, evaporation concentration method, electrolysis method, etc.

(1) Chemical method: it refers to the addition of chemical agents in electroplating wastewater to remove precipitation. This process is simple in operation and low in cost, so it is widely used in the electroplating industry. Many electroplating wastewater is treated by chemical precipitation method, but chemical precipitation method can only treat some pollution sources, which is likely to cause secondary pollution.

(2) Ion exchange method: ion exchanger is mainly used to exchange and separate harmful substances in waste water. It is simple to operate, can recycle heavy metals, and has less secondary pollution. However, the cost of ion exchanger is high, and the consumption of regenerant is large.

(3) Electrolysis: a method of removing metal ions mainly through direct current. This method has a special effect on the removal of metal ions from electroplating wastewater. However, this technology requires high current and high power consumption.

2、 Electroplating wastewater treatment process

Chemical treatment, membrane treatment and other technologies are selected to ensure stable equipment operation, low energy consumption and high treatment efficiency, and the permeate of online treatment equipment that can improve economic benefits can be returned to the cleaning tank as rinsing water for recycling, and the concentrated solution can be returned to the electroplating tank for recycling and zero discharge of copper, nickel and other gold ions