Research of combined use of carbon and aluminum compounds for wastewater treatment

Abstract

The study is devoted to studying the adsorption properties of a thermally modified carbon-containing material of schungite in combination with a coagulant aluminum oxychloride for fur-ther operation in a combined wastewater treatment. The carbon sorbent traditionally used in water sorption treatment-hydroanthracite and untreated ground natural mineral shungite has been stud-ied. Its thermal modification in order to increase the specific surface and total pore volume to in-crease the cleaning efficiency was carried out on the basis of the obtained experimental data on adsorption on natural shungite and hydroanthracite. In the course of the experiment, the thermal modification of natural adsorbent based on the schungite from Zazhoginsky deposit in Karelia was studied. A comparative study of the adsorption of iron (III) was made on the following adsorbents: anthracite, natural schungite, thermally modified schungite. The isotherms adsorption of iron (III) as a function of the equilibrium concentration were obtauned. The degree of extraction of the metal cations from standardized test solution using initial and modified natural adsorbents was deter-mined. The use of oxychloride coagulant is suggested to clean the water up to the required indica-tors. On the basis of experimental data, a two-stage wastewater treatment scheme is proposed using the modified schungite and aluminum oxychloride coagulant. Following the results of experiments, it is possible to draw a conclusion that modified shungite adsorbs in comparison with anthracite 1.4 times higher and twice above, then natural shungite without heat treatment. The value of the maximum adsorption is of the great importance for the modified shungite, which almost in 7 times more the maximum adsorption received for anthracite and by 5.6 times-for not processed natural shungite.