The effect of various surfactants on the physicochemical parameters (particle size and zeta poten tial) of the disperse phase of copper, nickel, and zinc hydroxides at concentrations of cationic, anionic, and nonionic surfactants of 2, 10, 50, and 100 mg/L at pH of 9.5-10.5 was studied. The efficiency of their elec troflotation extraction into a flotation froth was determined in a laboratory electroflotation module with anti wear oxide electrodes with efficiency of higher than 95% (initial concentration 50 mg/L, in the form of flo tation sludge, processing time no more than 30 min, current density 0.2 A/L).

Manufacturing processes in the electroplating industry employ hazardous chemicals and generate hazardous waste, including hexavalent chromium compounds and heavy metal cyanides. We designed a reagent-based treatment technology that can remove these contaminants and is relatively simple to implement and maintain. The technology features low reagent consumption but high treatment efficiency and simplifies separating precipitates from the treated effluent. The paper presents a detailed description of how to neutralise electroplating shop wastewater. We propose a system of organizational and technological measures to improve chemical safety.

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