Hybrid microfiltration (MF)–ultrafiltration (UF) and hybrid coagulation–ultrafiltration membrane processes were investigated and compared for dissolved organic matter (DOM) reduction in the low turbidity raw water supply from Sri-Trang Reservoir, Thailand. The coagulation process was operated with 20 mg/L polyaluminum chloride (PACl) at pH 7. The MF used had a pore size of 0.1 μm and the UF was of immersible polysulfone hollow fiber membrane with a pore size of 0.008 μm. The hybrid coagulation–UF process could effectively reduce DOM in terms of dissolved organic carbon (DOC) and UV-254 by 64% whereas the hybrid MF–UF membrane process yielded lower efficiency, 58% DOC reduction and 50% UV-254, respectively. In regards to trihalomethane formation potential (THMFP) analysis, the hybrid coagulation–UF membrane process showed slightly higher efficiency in THMFP reduction than that of the hybrid MF–UF process, 87.6 and 87.1%, respectively. The resin adsorption technique using DAX-8 was also employed to fractionate DOM in all water samples into two fractions; hydrophobic (HPO) and hydrophillic (HPI) organic matter. Significantly, HPO was the major fraction of DOM in the raw water source and it was the main precursor of THMFP.
Reduction of dissolved organic matter and trihalomethane formation potential in raw water supply reservoir by hybrid ultrafiltration process
Warintorn Banchapattanasakda, Charongpun Musikavong, Thunwadee Tachapattaworakul Suksaroj, Chaisri Suksaroj; Reduction of dissolved organic matter and trihalomethane formation potential in raw water supply reservoir by hybrid ultrafiltration process. Journal of Water Supply: Research and Technology-Aqua 1 December 2011; 60 (8): 494–501. doi: https://doi.org/10.2166/aqua.2011.001
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