Treatment of electroplating wastewater

The manufacturer of high voltage electrostatic circulating water will explain the treatment of electroplating wastewater to you.

(1) The automation of wastewater treatment facilities is not high

Strengthening the automatic control and automatic monitoring of wastewater treatment can ensure the stability of operation parameters and ensure the sewage discharge standard.

The wastewater treatment control and dosing system, using automatic technology to control, can save a lot of labor, reduce the incidence of human error, prevent the occurrence of problems that should not occur, and strictly control the sewage discharge. However, due to the capital and the scale of the plant, the automation level is not high, which seriously affects the treatment of electroplating wastewater.

(2) The amount of alkali used is relatively large

When electroplating companies deal with wastewater by chemical precipitation, the amount of alkali input is relatively large, one part is used in acid neutralization, the other part is used in heavy metal precipitation. The reasons for excessive use of alkali include: in some processes with large amount of acid, the acid is directly discharged into the wastewater without separate treatment, which increases the cost of wastewater treatment; the heavy metals in wastewater are not treated by recycling, but precipitated by adding alkali directly, resulting in the increase of alkali consumption and the production of sludge; There is no automatic dosing system, resulting in insufficient or excessive dosage of chemicals. In order to ensure the water quality of discharge, many enterprises will put in chemicals, which not only wastes the chemicals, but also increases the difficulty of sewage treatment.

(3) Heavy metals are not recovered

Because the electroplating wastewater contains nickel, gold and silver and other heavy metal ions, and the content of heavy metal ions in some wastewater is relatively high, if the recovery is carried out directly, it is easy to cause economic losses and increase the content of heavy metals. In addition, because electroplating sludge is a hazardous waste, sludge treatment has always been a difficulty. In the actual treatment process, many heavy metal ions are not recovered.