Heavy metal wastewater treatment

- Aug 22, 2018 -

For the pre-treatment washing water and nickel-containing wastewater, the wastewater can be treated by membrane treatment technology and reused in the pre-cleaning water, which effectively reduces the discharge of wastewater and greatly reduces the water consumption of the production line. Membrane separation technology is applied in electroplating wastewater treatment, mainly microfiltration, ultrafiltration and reverse osmosis. Microfiltration and ultrafiltration are screening mechanisms, mainly used for membrane bioreactors and wastewater pretreatment. Reverse osmosis is the introduction of a solvent (such as water) in a solution through a semipermeable membrane that selectively permeates a solvent (such as water) into the low pressure side of the membrane under pressure, while other components (such as salt) in the solution are It is retained on the high pressure side of the membrane to obtain separation and concentration. In the electroplating wastewater treatment, the reverse osmosis membrane is used to intercept heavy metal ions and organic additives (such as brighteners, etc.), and water molecules are allowed to pass through the membrane, thereby achieving the purpose of separation and concentration.

Membrane treatment technology and corresponding membrane treatment equipment, after repeated membrane treatment, the treated water quality can meet the requirements of water quality for cleaning and preparation of plating solution in the production line. It can recover heavy metals and water resources from electroplating wastewater, reduce or eliminate its pollution to the environment, and achieve clean production of electroplating. Membrane separation technology for electroplating wastewater with high added value of gold and nickel can realize closed loop and produce Good economic benefits. For the comprehensive electroplating wastewater, after simple physical and chemical treatment, most of the water can be reused by membrane separation technology, and the recovery rate can reach 60%-80%, reducing the total discharge of sewage and reducing the pollutants discharged into the water body.

The significance of this measure is not only to achieve the reuse of wastewater, but also to mark the era of water recycling.

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