COMPARATIVE STUDY ON PERFORMANCE OF COAGULANTS IN WATER TREATMENT

B.G.Mahendra, Madhusudhan C

Abstract: The study on the performance of different coagulants in water treatment was carried out using coagulants such as alum(C1), Poly aluminium chloride(PAC)(C2) and sodium aluminate(C3). The performance was studied with respect to turbidity removal, concentration of residual aluminium and comparative cost of coagulants for treatment of Bhima river water. The performances of these coagulants were studied separately as well as mixture of two coagulants in equal proportions. C1 and C2 were mixed to get coagulant mixture (CM1), C1 and C3 were mixed to get CM2, C2 and C3 were mixed to get CM3. The study reviews that the coagulants C1 and CM3 were found to be more efficient with 100% removal of turbidity at turbidities up to 50 NTU. For higher turbidities above 50 NTU, the coagulants C1, C2 and CM1 are found to be more efficient with 100% turbidity removal. The concentration of residual aluminium is found to be less in CM1 and C2. For turbidities of 200 NTU and 400 NTU with optimum dosages, the concentrations were 0.02mg/L and 0.04mg/L for CM1 respectively

Keywords: Coagulants, turbidity, residual aluminium

DOI: https://doi.org/10.15623/ijret.2013.0213052