STUDY OF THE EFFECT OF MEDIUM PH ON THE KINETICS OF THE WATER DEMANGANATION PROCESS

Abstract

During the investigation of manganese ions oxidation with the oxygen of the air in an aqueous medium it was established that pH has a significant effect on the process. Studies have shown that within 24 hours of settling the solutions with manganese ions concentrations in the range between 1.0 to 30.0 mg dm-3 under the condition of free contact of solution surface with the oxygen of the air, the efficiency of the oxidation was quite insignificant and was only 10 - 20 %. However, in the case of increasing the pH to 8.5 - 9.5 and passing the air through the solution, an increase in the removal efficiency of manganese ions was achieved, which depended on ions initial concentrations. At pH = 9.5 and a manganese ions concentration in the solution of 1.0 mg dm -3, the degree of removal reached 35.0 %, and at concentrations of ions of 15.0 and 30 mg dm-3, it was possible to achieve removal of 24.0 and 26.7 %, respectively.
Under the same conditions, manganese ions minimum concentration was 0.65 mg dm-3.