METHOD OF THE LOCAL REACTANT PURIFICATION OF THE SPENT CONCENTRATED SOLUTIONS FROM IONS OF THE HEAVY METALS AND MANGANESE Russian patent published in 2007 - IPC C02F9/04 C02F1/62 C02F1/64 

FIELD: environmental protection; methods of purification of the industrial waste waters containing the concentrated solutions with ions of the heavy metals and manganese.

SUBSTANCE: the invention is pertaining to purification of the industrial waste waters containing the concentrated solutions with ions of the heavy metals and manganese. The method provides for transformation of ions of the heavy metals and manganese into the low-soluble compounds by neutralization of the waste waters using the water solution of the alkaline reactant, settling of these compounds by means of addition of the water solutions of aluminum sulfate - as the coagulant and polyacrilamide - as the flocculant into the neutralized waste waters, settling-out of the neutralized waste waters, filtration of the settlings by means of the filtration material and the subsequent drain in the acidic-alkaline drainage of the purified waste waters with the contents of the ions of the heavy metals and manganese not exceeding the maximum permissible concentrations. In the beginning of the purification cycle conduct activation of the gathered spent waste waters by addition of the water solution of the universal flushing technical mean. The waste waters neutralization is conducted by means of the concentrated 46 % water solutions of alkali up to production of the alkalescent medium in the waste waters containing the ions of the heavy metals, or the alkaline medium in the waste waters containing the ions of manganese. Then introduce the concentrated water solutions of the coagulant (140 g/dm³) and the flocculant (2 g/dm³) in quantity of 100 ml per 100 l into the neutralized waste waters with ions of the heavy metals or in the ratio of 1:60 to the volume into the neutralized waste waters with ions of manganese. As the filtration material apply the chemisorption fiber on the basis of polyacrylonitrile fibers. The given method allows to conduct purification of the concentrated waste waters with the high efficiency and to produce the concentrated slimes as the additional reutilizable products.

EFFECT: the invention allows to conduct purification of the concentrated waste waters with the high efficiency and to produce the concentrated slimes as the additional reutilizable products.

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