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Electroplating wastewater program

2016-06-21 15:22:57 天工欧凯 Read

Electroplating and metal processing industry wastewater is a major source of pollutants towing plating or pickling liquid. Metal contamination by rinsing process and transferred to the rinse water. Pickling process includes metal (zinc or copper) was first immersed in a strong acid to remove the oxide surface, followed by immersion brightener containing chromic acid and strong credit process is carried out. The wastewater contains large amounts of hydrochloric acid and zinc, copper and other heavy metal ions and organic brighteners, greater toxicity, and some also contain carcinogenic, teratogenic, mutagenic toxic substances, great harm to humans. Therefore, the electroplating wastewater must be taken for recycling, so to eliminate or reduce pollution of the environment.

Electroplating wastewater treatment equipment by the regulation pool, plus kits, restore the pool, and the reaction cell, pH adjusting tank, flocculation tank, Sedimentation, Van filter, clean water tank, flotation response, activated carbon filters and other components .

By the electroplating wastewater by adding chemicals, pollutants in waste water oxidation, reduction, or a chemical reaction to produce coagulation, and then separated from the water, the waste water to be purified, to meet emission standards after discharge. Depending on the pollutants contained in the wastewater, adopt different processes. The processing wastewater containing cyanide (cyanide copper, cadmium plated, silver plated, alloy, etc.) adding an oxidizing agent (optional sodium hypochlorite, bleaching powder, bleaching fine, chlorine, etc.); treatment of wastewater containing chromium reducing agent dosing (optional sodium bisulfite, hydrazine hydrate, ferrous sulfate, etc.); treated galvanized (alkaline zincate) waste water coagulant; treatment of the acid, alkali and water dosing agents and the like. Then the metal hydroxide precipitate separation, flotation, filtration, solid-liquid separation measures from the wastewater out of the waste water discharge standards, the sludge can be separated according to their characteristics, comprehensive utilization or harmless treatment, prevention cause secondary pollution.

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