Evaluation of efficiency of coagulant obtained from elaborated red sludge from alumina plant

Abstract

In document, the effectiveness of reducing the chromaticity and turbidity of the Dnipro river water was investigated and estimated by means of existing coagulants Al2(SO4)3·18H2O and FeCl3·6H2O and synthesized coagulant from the red sludge of alumina plants - SC. During the experimental part of the work in the laboratory, the following optimal dosages of coagulants were chosen, namely, 0, 1, 2, 5, 10 mg/dm3 based on Al2O3 and Fe2O3. The volume of samples of the solutions, which were subjected to the study, reached 200 ml. Model solutions of bentonite with a concentration of 100 mg/dm3, sodium humate with a concentration of 16.8 mg/dm3, kaolin concentration of 100 mg/dm3 and natural water of the Dnipro River were used. Based on the analysis of the experimental data obtained, it was found that the alternative coagulant is not inferior to the existing and widely used coagulants. During clearing and discoloration of the Dnipro river waters, the SC showed better results. Therefore, it can be said that obtaining "alternative" coagulants from waste products is a very promising and economically viable direction of research and development of new reagents for water purification and water treatment.

Keywords

• coagulant
• chromaticity
• turbidity
• filtration
• waste sludge
• discoloration