SU1354623A1 - Method of processing waste water of galvanic production - Google Patents

Abstract

FIELD: procession of industrial waste water. SUBSTANCE: method comprises steps of mixing acidic and basic regeneration solutions of and burst-type drainings of galvanic bathes and softening them by alkali reagent, including NaOH, up to pH 9-12; separating heavy metal deposit, had been received; concentrating clarified solutions by evaporation at first by 2.5-3.5 times upon their downwards motion in the form of a film and further by 5-7 times; separating the solid phase at ratio of the solid and liquid phases, being 1: 2.5-0.9, and returning the solution to the technological process. A secondary steam, had been received at concentration of the initial solution by 2.5-3.5 times, is being used as heating steam for the second concentration stage. A condensate with the secondary steam, had been received upon concentration of the solution by 5-7 times, is being directed to a rectification tower. The condensate, had been purified in the tower from volatile additives, is being returned to the technological cycle. A degree of the solid phase separation consists 100% a humidity value of the deposit had been received, consists 11.0-15.6%; salt content in the condensate 0.047-0.053%. EFFECT: increased separation degree of the solid phase, lowered humidity value of the solid phase and decreased salt content of the condensate. 1 cl, 1 tbl