Electroplating wastewater commonly used treatment methods

Electroplating industry wastewater contains a large number of heavy metals, its wastewater contains a large number of copper, zinc, gold, silver, nickel, lead, iron, chromium and other heavy metal elements, so the treatment of electroplating wastewater is extremely important, the general common electroplating wastewater treatment methods are what?

Because of the complexity of the electroplating industry, usually the wastewater is acidic, a few alkaline, these are mainly related to the items that need to be processed as well as the number of general Electroplating Wastewater Treatment Methods:

Ion-Exchange Method:

Based on the content of wastewater in the The ions of the wastewater content with the exchange resin in the ion exchange, exchange combined with the removal, and finally achieve the effect of wastewater purification.

Reduction method:

According to the wastewater oxidizing substances need to be different to the wastewater into different reductants, common reductants NaHSO3, FeSO4, SO2, etc., reduction method is one of the governance technology used in China, the principle of its operation is simple, but also to deal with large-scale, high concentration of electroplating wastewater.

Neutralization and precipitation method:

Neutralization and precipitation method is the principle of adding alkali to the wastewater so that the neutralization reaction occurs, for the plating wastewater containing cyanide, corrosive, halogens, etc. in the neutralization and precipitation of the wastewater needs to be pre-treated, such as wastewater particles in the wastewater is too small or not easy to precipitate the flocculant needs to add to aid in the precipitation, and finally produce insoluble substances. Precipitation, and finally generate insoluble substances, precipitation separation.

In addition to the above three wastewater treatment methods, there are sulfide precipitation, chemical precipitation, chelating precipitation method can be electroplating wastewater treatment, different wastewater treatment methods are mainly based on the need to deal with the raw water as well as the cost of the water, water requirements set.