The presence of heavy metal ions in biologically treated municipal and industrial wastewater was analyzed, with their concentrations often exceeding the maximum permissible limits for water bodies of fisheries significance. The results of studies on the extraction of heavy metal ions from a model multicomponent solution using new sorbents based on modified clays from deposits of the Republic of Azerbaijan are presented. The process of thermal modification was investigated. The properties of the new material were studied in the range of low concentrations characteristic of biologically treated wastewater and industrial effluents. Sorbents produced on the basis of clays make it possible to achieve fishery-standard maximum permissible concentrations during the post-treatment of biologically treated municipal and industrial wastewater from copper, iron, manganese, zinc, lead, and aluminum. For deep purification of wastewater from copper, iron, manganese, zinc, and lead ions, the most effective sorbent was the one made from two types of clays and peat in equal proportions, using polyvinyl acetate emulsion as a binder.
Ibadova et al. (Thu,) studied this question.