THE EFFECT OF SALINITY ON THE EFFICIENCY OF WASTEWATER TREATMENT FROM IRON (III) IONS BY ELECTROFLOTOSORPTION METHOD

Abstract

Studies of the effect of sodium chloride, sulfate and nitrate salts on the sorption of iron (III) ions on an industrial powder sorbent of the brand "OU-A" in static mode have been carried out. It has been established that along with the nature of the salt, its concentration affects the sorption mechanism. The isotherm of adsorption of iron (III) ions from sodium nitrate solution can be attributed to type H according to the Gilsa classification, which implies the presence of a specific interaction with the surface of activated carbon. The sorption capacity of coal increases with an increase in the concentration of salts of chloride and sodium nitrate from 1 to 50 g/l, while the full saturation of the adsorbent Fe3+ in a solution of 50 g/l of sodium nitrate is not observed. The process of electroflotation extraction of spent sorbent from salt solutions is investigated. The effectiveness of electroflotation is affected by both the nature of the salt and its concentration in the solution. It was found that with an increase in the concentration of sodium chloride and sodium nitrate salts to 50 g/l, the degree of extraction of the spent sorbent decreases slightly by an average of 1-5%. At the same time, the efficiency of the electroflotation process drops to zero in sodium sulfate solutions with a concentration of more than 5 g/l at pH = 7. However, in acidic solutions (pH = 4) with a salt concentration of 50 g/l Na2SO4, the degree of coal extraction is 71%. Studies have shown that the use of a combined method, including sorption on coals with subsequent extraction of spent sorbent by electroflotation method, can provide high-quality pretreatment of water from iron (III) ions for reliable operation of desalination systems in industrial water purification systems.