Application of Response Surface Methodology to Optimize Coagulation Treatment Process of Urban Drinking Water Using Polyaluminium Chloride

Many coagulants such as aluminium sulfate, ferric and ferrous sulfate have been investigated in the past, but there is a lack of data on their effectiveness to some specific water quality parameters. This study aimed at investigating efficiency coagulation treatment process remove pollutants total organic carbon (TOC), nitrogen (TN), suspended solids (TSS) from urban drinking water. The polyaluminium chloride (PAC) coagulant was applied determine impact structure diversity these All samples were collected Yangtze River, Baoshan district, Shanghai, China, over period three months which coincided with late summer early winter periods. Specific different characterizations, preliminary test performed other coagulants, namely, polyaluminium, silicate optimal conditions for floc characterization removal efficiencies. In summary, overall performance PAC better than that used pre-treatment sampled obtained results revealed under optimum operating conditions, doses follows: 20, 35, 50, 65, 80 mgL−1, respectively. temperature pH determined by using meter, TOC TN analyzer, TSS following ASTM D2540 method. Furthermore, response surface methodology Box–Behnken optimization analysis dosage, temperature, pH, corresponding dependent factors (TSS, TOC, TN) best performance. To whether or not quadratic model adequately explained predicted during process, an variance performed. Multiple identified treatment, including value 6.9, 20.1 °C, dosage 9.7 mgL−1.