The use of electroflotation for purification of natural waters and sewage and for mineral resources enrichment is discussed. Our aims were to find conditions under which a minimal number of oxidative bactericidal agents is formed, i.e. as opposed to the more common situation of their intensive formation at both electrodes, so as to study the influence of some other factors on the bactericidal processing of liquid media that take place under conditions of direct electrolysis. Investigations of the influence of electroflotation on the content of oxidants in a liquid medium and on pH variations has been carried out on model solutions of Na_2SO_4 and KCl. Vine yeast Sacchoromyces vini cultivated in a standard nutrient was used as the test medium in the experiments. Features of the construction of the electroflotation units used in the experiments (horizontal or vertical arrangement of electrodes, the use of different metals as electrode materials) have been taken into account. The dependence between concentration of oxygen (and chlorine) and the electrolysis duration was determined with and without membrane participation. Changes of pH relative to the specific conditions of electrolysis were also studied. Following tests with model solutions, real potable water was used in tests on the regularities of formation of the active oxidants. The mechanism of the bactericidal effect that takes place under the chosen electroflotation conditions is discussed in detail.
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