Feasibility study on high turbidity and poorly settleable raw water for water supply production by coagulation
1997
Rachadawan Panatampon
Coagulation process has been conducted by the pilot plant lab scale for the high turbidity and poorly settleable raw water. Raw water was tested against 3 coagulants, namely : alum, polyaluminum chloride and ferric chloride in conjunction with 4 coagulant aids, namely : lime, anionic polyelectrolyte, cationic polyelectrolyte and nonionic polyelectrolyte. According to this study, it is feasible to verify the treated water to meet WHO drinking water standard. The most suitable coagulation process has been tested by anionic polyelectrolyte at its optimal dose 0.4 mg/L followed by 70 mg/L of polyaluminum chloride with raw water samples of pH 7.0, it resulted very high turbidity removal efficiency up to 99.68 percent. The settling velocity of floc was maximized at 1.2604 cm/min with minimum sludge volume ratio of 285 ml/L. The total cost of this chemical program is 3.27 baht/cubic meter. However, the pH of clarified water was slightly below the standard, thus, it required pH adjustment with lime prior to the distribution system.
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