St. Petersburg Mining University (St. Petersburg, Russia):

Sulimova M. A., Leading Engineer, Laboratory of Theoretical and Applied Chemistry, e-mail: wwlog@ya.ru
Sizyakov V. M., Dr. Eng., Prof., Chair of Metallurgy
Litvinova T. E., Dr. Eng., Ass. Prof., Chair of General and Physical Chemistry, e-mail: viritsa@mail.ru
Vasilyev V. V., Cand. Eng., Ass. Prof., Chair of Metallurgy, e-mail: vovchegv@mail.ru

Possibility of the use of ferromanganese nodules from the Finnish Gulf for sewage treatment at the enterprises of mineral and raw material complex was proved in this paper. The main examples of polluting of waste water by various plants of metallurgical industry with phenols and cyanide compounds are shown. Ferromanganese nodules were studied by the methods of synchronic thermal analysis and Raman spectroscopy. Structure and phase composition of ferromanganese nodules from Finnish Gulf were examined in details. Existence of iron oxide (III) and manganese oxide (IV) in amorphous and semi-amorphous form in these nodules was established, and it distinguishes the structure of ferromanganese nodules from the Finnish Gulf in comparison with oceanic nodules; it also stipulates their high sorption activity regarding to organic substances. Various adsorption mechanism of phenols, cyanide compounds (including their catalytic oxidation on the surface of ferromanganese nodules) and cations of ferrous and heavy non-ferrous metals aloows to provide cleaning of waste water with removal of organic and inorganic impurities as a single process. The kinetic equations of sorption of phenols and cyanide compounds for ferromanganese nodules were obtained. It was also established that cleaning of waste is based on their sorption ability. Thereby, waste water cleaning by ion exchange mechanism can be performed in parallel with the sorption mechanism. The principal schematic diagram of the adsorption unit for waste water cleaning is presented.

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