FIELD: electroplating; metallurgy; leather production.
SUBSTANCE: method includes treatment with an alkaline solution, adding a precipitant and separating the precipitate. Moreover, wastewater is alkalized with a solution of sodium hydroxide to pH=9.5-11, and a solution of chloride or calcium nitrate is used as a precipitant.
EFFECT: increased speed of the cleaning process, improved precipitation of heavy metal hydroxides and amphoteric hydroxides of chromium and zinc, as well as a decrease in the amount of well-filtered sediment.
1 cl, 3 ex
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