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государственное бюджетное образовательное учреждение высшего образования «Омский государственный аграрный университет им. П.А. Столыпина», Омск, Россия 4 Федеральное государственное бюджетное научное учреждение «Всероссийский научно-исследовательский институт биологической защиты растений», Краснодар, Россия

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Process of extraction of nickel hydroxide from the nickel containing sludge of "Robert Bosch Saratov" Ltd have been studied. It was established that it can be used as an active component of cathode mass for manufacture of Ni(OH)2electrode of a nickel-cadmium (iron) battery. Conducted tests of the Ni(OH)2 based electrodes showed high electrochemical characteristics at work under conditions of production mode, good stability and duration of discharge: capacity 0,93–1.0 A・h, coefficient of use 83–86 % during 110 charge-discharge cycles. Technological scheme of Ni(OH)2 production is presented. The prevented ecological damage to soils resources of Saratov region is calculated. It is 95.000 rub/h. Evaluation of descending of hazard class of the galvanic sludge for environmental on ecological parameters of safety is conducted. By biotesting (on Chlorella vulgaris Beijer) and calculation methods it was shown that extraction of nickel allows to reduce of hazard class of the galvanic sludge from 2–3 to 4.