METHOD AND APPARATUS FOR PURIFYING ACID MINE WATER Russian patent published in 2024 - IPC C02F1/66 C02F1/46 C02F9/00 

FIELD: waste water.

SUBSTANCE: invention relates to treatment of acid mine waste water from suspended particles, ions of pollutants, including heavy metal ions, and can be used in treatment of mine waste water formed during extraction of non-ferrous metal ores by mine and quarry methods. In the ejection unit of the initial water accumulation tank, the supplied acid mine water is subjected to vacuum-ejection treatment using several ejectors. Ionic balance of the treated water in the galvanic softening unit is partially restored due to the action of a galvanic pair of copper and aluminum on it. NaOH solution is dosed from reagent dosing tank, pH is increased to values of not less than 9.5, but not more than 10.5. pH level approaches 7.5–8.5 12–15 hours after treatment. NaCl is dosed from the reagent dosing tank. Complex electromagnetic and electrochemical treatment is carried out in electrolytic cells, which leads to formation of a suspension from a coagulant and a flocculant. Flakes of condensed impurities in the form of aluminum hydroxide and iron hydroxide are obtained in electrolytic cells, which are obtained by dissolving electrodes from aluminium and iron in electrolytic cells under action of electric current. Obtained flakes of condensed contaminants, which include coagulants and flocculants, are directed together with the stream of treated water into a degasser for separation of gases formed during electrolysis. Purified water with weighted contaminants, coagulant and flocculant flakes is directed to the gravity separation unit, in which most of the contaminants are separated, and water with a smaller amount of contaminants is supplied to the clarification unit. In the clarification unit, the remaining impurities are deposited on the bottom of the tank. In the tank of gravitational separation and clarification oxidized and condensed impurities in the form of flakes are used as an additional filtering element. Purified water is filtered on a complex pressure filter.

EFFECT: increased degree of acid mine water treatment.

2 cl, 1 tbl, 1 dwg