TREATMENT OF EFFLUENTS OF TITANIUM-MAGNESIUM PRODUCTION Russian patent published in 2015 - IPC C02F9/08 C02F1/56 C02F1/62 B01D21/01 C02F103/16 

FIELD: process engineering.

SUBSTANCE: invention may be used for biological cleaning of industrial effluents. Effluents are mixed to separate solid suspensions in sand trap. Obtained effluents are neutralized in two steps by lime milk at calcium oxide concentration therein making at least 100 g/dm³. At first step, lime milk is added to the flow of effluents at flow rate of 5-20 m³/h and mixed by mechanical mixer and bubbler for 1.0-1.5 h. At second step, neutralisation is performed in settler at lime milk flow rate of 0.1-5.0 m³/h. After neutralisation, effluents are processed with aqueous solution of Praestol flocculating agent at feed rate of 2.2-6 m³/h and flocculating agent-to-effluents ratio of 1:(95-110). Suspensions are directed to settler and divided into purified effluents and sludge. Said sludge from settling step is mixed during 1.2-1.5 h with that of neutralisation step and that of processing with Praestol flocculating agent at its weight ratio of 0.5-0.8 wt % and sludge-to-Praestol ratio of (10-20):1. Produced mix is subjected to separation of centrifugation into filtrate and solid residue to be used as a protective material at sites of solid industrial and household wastes, dumps and pits.

EFFECT: better cleaning

7 cl, 1 ex