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The main source of electroplating and metal processing industry wastewater is zinc plating or pickling liquid entrainment. Metal contaminants by rinsing process and transferred to the rinse water. Pickling process involves metal (zinc or copper) was first immersed in acid to remove the oxide surface, followed by immersion brightener containing chromic acid were strong credit processing. The wastewater contains large amounts of hydrochloric acid and zinc, copper and other heavy metal ions and organic brighteners, high toxicity, and some also contain carcinogenic, teratogenic, mutagenic, toxic substances, great harm to humans. Therefore, electroplating wastewater treatment must be carefully recycled, so eliminating or reducing its pollution of the environment.
Electroplating wastewater treatment equipment by regulation pool, plus kits, restore the pool, and the reaction tank, pH regulation pool, flocculation, Sedimentation, Van filter, clean water tank, flotation response, activated carbon filters and other components .
Electroplating wastewater treatment using iron inner electrolysis treatment process, the technology is mainly used for industrial scrap iron after activation purify waste water, waste water when in contact with the filler, the electrochemical reaction, chemical reactions and physical effects, including catalysis, oxidation, reduction combined effects, substitutions, coprecipitation, flocculating, adsorption, to various metal ions in waste water removal, wastewater purification.
General electroplating wastewater treatment by the following method: to dosing pharmaceutical wastewater, so that one of the toxic substance converted into non-toxic substances or greatly reduced toxicity of sediment. Chemical method comprising:
And precipitation method
Such as waste water or acid waste water with an alkaline substance dosing alkaline neutralization, a precipitate formed.
In precipitation and coagulation
For example, in addition to chromium ion exchange process, the cation-exchange column regeneration of waste containing heavy metal ions (Zn2 +, Cr3 +, Fe3 +, etc.) strongly acidic waste, can regenerate waste alkali lye or acid radical anion exchange column after removal of the and, so as to form a hydroxide precipitate. Such as polymer flocculant dosing may alter performance settling and separation performance of this precipitate.
A process when wastewater containing cyanide, commonly hypochlorite oxidation under basic conditions wherein the cyanide ions, so that decompose into toxic cyanate, and then further degraded to non-toxic carbon dioxide and nitrogen.
Such as chromium-containing wastewater with sodium bisulfite or ferrous sulfate plus lime treatment, the Cr6 + is reduced to the low toxicity of Cr3 +, and the formation of chromium hydroxide precipitate.
Barium salt method
Such as chromium-containing wastewater treatment with barium salts, making chromate become barium chromate precipitation.
Electroplating wastewater treatment to produce hydrogen through iron or other heavy metal hydroxide precipitation, oxidation by heavy metals into the ferromagnetic ferrite crystals. This method can be used for treatment of wastewater containing chromium. Chemical equipment is simple, less investment, wider application. But often leaving sludge requires further treatment, and electroplating wastewater dispersed sludge easy centralized processing and utilization.
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