Research studies of the efficiency of chemical technology for tertiary treatment of plating wastewater

Summary

The purpose of this study was a supplementary estimation of the effectiveness and optimal process parameters of a single-stage filtration technology for removing heavy metal ions and other contaminants from plating wastes. The technology was developed at NSUACE (Sibstrin) over 10 years ago. The results of the research studies conducted with actual wastewater from an operating plating plant are presented. The essence of the proposed tertiary treatment method is the conversion of heavy metal ions and hydroxides remaining in the effluent after neutralization and clarification in settling tanks with sodium sulfide into sulfides with a solubility millions of times lower than that of hydroxides. The experiments were conducted using various types of filter media (albitophyre, Sorbent MS, and Gidroantratsit A), with varying filtration rates, dosages, and chemical types. Optimal purification parameters were determined, as well as the application areas of single- and two-stage systems. Following single-stage treatment the effluent can be freely discharged into municipal sewers and water bodies used for drinking and household or cultural and social purposes, as well as used in the recycling water supply of plating plants. After two-stage filtration through clarification and sorption filters, the MPCs are achieved for discharging the effluent into fishery water bodies.

Key words

wastewater , granular media , filtration , efficiency of treatment , heavy metal ions , plating plant