Empress Catherine II Saint Petersburg Mining University, Saint-Petersburg, Russia:

Yu. D. Smirnov, Associate Professor, Candidate of Engineering Sciences, smirnov_yud@pers.spmi.ru
V. A. Matveeva, Associate Professor, Candidate of Engineering Sciences
N. M. Yakovlev, Student
E. R. Sakhabutdinova, Student

Galvanic production plays a significant role in many industries, including mining, and at the same time is a strong environmental pollutant, mainly due to the formation of large volumes of wastewater with high concentrations of heavy metals. Currently, electroplating shops are equipped with treatment facilities, in which, in most cases, a chemical method is used to remove heavy metals from wastewater. This method is harmful to human health due to the use of chemically active reagents, and is expensive because of their high cost and high consumption. In modern conditions, the choice of a product for wastewater treatment should be focused on inexpensive and affordable raw materials; therefore, in the course of this work, the experiments were carried out to remove heavy metals from wastewater of galvanic production using agricultural waste. Sedimentation with the help of husks and stalks of agricultural waste occurs due to polyflavonoids. The essence of the experiments was to prepare extracts from the above wastes and add them in various proportions to wastewater samples from the electroplating shop. After a while, a precipitate formed, which was filtered out, and the water was sent for the analysis of the residual content of heavy metals. In the course of the experiments carried out at the Ecosystem Research Center of the Mining University, the most promising method of purification using agricultural waste was identified, which made it possible to remove Cr, Fe, Cu and Zn ions from wastewater at an efficiency of up to 93%, 89%, 69% and 70% respectively.

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