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DEVELOPMENT OF THE TECHNOLOGY OF LOCAL MINE WATER TREATMENT AND HIGHLY CONCENTRATED WASTE STREAMS FROM GALVANIC BATHS
Abstract
Hydrochemical studies of mine water on abandoned Nagornaya mine showed that they are weakly alkaline with high color, permanganate demand (PD) and content of iron cations compared to Russian state legislation standards for natural water of a different type. Mine water are polluted with Na, Li, Cu, Ni and Sr cations, while gas chromatography identified some saturated hydrocarbons, mainly from ?22?46 to ?32?66. The study demonstrates a developed technology of local mine water treatment with a high color, PD and iron concentration. The scheme offered includes two basic stages: electrochemical oxidation with industrial ruthenium-titanium oxide electrode comprising 30% RuO2 and 70% TiO2, and electric coagulation on Al-anodes. As per the scheme, the content of easily oxidable organic substances, iron cations and color are reduced to environmental quality standards. Physical-chemical methods of separated decontamination of highly concentrated waste streams from galvanic (electroplating) baths containing nickel, copper, and zinc ions using modified forms of vermiculite have been suggested. At the first stage, decontamination is performed by the method of coagulation using a detergent solution (decontamination degree up to 99 %). Thereafter, the produced low-concentration solutions underwent electrochemical treatment. The third stage of extra adsorption decontamination by vermiculite-based sorbents was introduced for nickel- and copper-containing galvanic waste streams. The highest degree of decontamination from nickel and copper was attained using the vermiculite treated by 12 % hydrochloric acid and cellulose.
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