REPRODUCTION OF WASTE WATER CONTAMINATED BY IONS OF HEAVY METALS
Abstract
The article is devoted to the problem of wastewater treatment from ions of heavy metals. A brief review of methods of wastewater treatment from ions of heavy metals, their advantages and disadvantages is given. We investigated the possibility of extraction from wastewater of heavy metal ions by ultrafiltration-complexation in ultrafiltration mebrane. It is shown that in ultrafiltration the size of hydrated ions of all metals is much less than the diameter of the pore of the used membrane which makes it impossible to extract them from aqueous solutions.
However, if a high molecular weight component that forms a strong complex compound is introduced into the solution, the resulting polymer complex will be much larger than the diameter of membrane pore, which allows for separation on more large-pore and high-performance ultrafiltration membranes.
Instead of expensive synthetic polymers used environmentally friendly complexing agents derived from cheap natural raw materials (peat, brown coal) and having a high selective properties with respect to heavy metal ions. The results of the study are presented. It is concluded that the use of a method of treatment combining ultrafiltration with complexing using cheap chelating agents of natural origin, allows to increase the degree of purification of wastewater from heavy metal ions. To achieve the best results of water purification, this technology must be combined with other physicochemical and biological methods of water purification. These studies are relevant and bring novelty in the process of wastewater treatment.
Keywords: ions of heavy metals, cleaning of effluents, reactive, ion exchange, electrochemical, membrane methods, method of ultrafiltration, complexation.
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