Wastewater type
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Industrial wastewater
Many types of pollutants are produced in industrial production, and the types and concentrations of pollutants produced by different industries are significantly different.
A . electroplating wastewater
The main source of zinc in electroplating and metalworking wastewater is electroplated or pickled tow. The contaminants are transferred to the rinse water by a metal rinse process. The pickling process involves first immersing the metal (zinc or copper) in a strong acid to remove oxides from the surface, followed by immersion in a brightener containing strong chromic acid for brightness enhancement.
The wastewater contains a large amount of heavy metal ions such as hydrochloric acid and zinc, copper and organic brighteners, etc., which are highly toxic, and some contain highly toxic substances that are carcinogenic, teratogenic and mutagenic, which are extremely harmful to humans. Therefore, the electroplating wastewater must be carefully recycled to eliminate or reduce its environmental pollution.
Electroplating mixed wastewater treatment equipment consists of conditioning tank, dosing tank, reduction tank, neutralization reaction tank, pH adjustment tank, flocculation tank, inclined tube sedimentation tank, chamber filter press, clear water tank, air flotation reaction, activated carbon filter, etc. composition.
The electroplating wastewater treatment adopts the internal treatment of iron filings. The technology mainly uses the activated industrial waste iron scraps to purify the wastewater. When the wastewater is in contact with the filler, electrochemical reactions, chemical reactions and physical effects, including catalysis, oxidation and reduction, occur. The combination of replacement, co-precipitation, flocculation, adsorption, etc. removes various metal ions in the wastewater to purify the wastewater.