Removal of Turbidity, Organic Matter, Coliform and Heterotrophic Bacteria by Coagulants Poly Aluminium Chloride from Karoon River Water in Iran

Abstract

This study was conducted with the aim of investigating turbidity, coliform bacteria, heterotrophic bacteria removal efficiency with poly aluminum chloride from drinking water. The study was carried out at water treatment plant. in order to determine the optimum conditions of poly aluminum chloride performance in turbidity, coliform bacteria and heterotrophic bacteria removal. All the tests were performed based on variables such as coagulant dose (3, 5,8,10,15,20,30,40,50 mg/L), pH (5.5, 6, 6.5, 7, 7.5, 8) and turbidity between 33-100 NTU. The residual turbidity and microbial parameters of samples were measured and coagulant performance in turbidity and microbial parameter removal were determined. The results showed that the most optimal conditions for turbidity removal and microbial parameters efficiency by poly aluminum chloride were pH = 8, flash mixing =120 rpm and the optimal doses of poly aluminum chloride were obtained as 10 and 30 ppm. The turbidity, total coliform, fecal coliform and heterotrophic bacteria removal efficiency under optimum condition of poly aluminum chloride application for dose 10 ppm were, respectively, 96.59, 90, 82.75, 84.17 % while turbidity, total coliform, fecal coliform and heterotrophic bacteria removal efficiency under optimum condition of poly aluminum chloride dose of 30 ppm was 99, 94.65, 88.94, 90.47 %, respectively.