Application of Submerged Nanofiltration Membrane for Treating Natural Organic Matter from Reservoir Water
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Abstract
Surface water quality continues to be compromised by expanding residential and industrial activities. Chlorine is widely used in conventional treatment systems due to its low cost and availability; however, its reaction with natural organic matter (NOM) generates disinfection by-products (DBPs), particularly trihalomethanes, which are known as human carcinogens. Despite the increasing interest in nanofiltration (NF) membranes, studies on the application of submerged NF systems for treating real surface water without pretreatment remain limited, especially regarding trihalomethane precursor removal, ion rejection, and permeate stability. Comparative data with conventional treatment systems is also insufficient. This study investigates the performance of a submerged NF membrane relative to a conventional treatment system in a previous study for NOM removal. Water samples were collected every three days from Ang Kaew Reservoir, and the NF system was operated at a constant flux of 11 L/m²·h. All samples were analyzed at the Environmental Engineering Laboratory, Chiang Mai University. The NF membrane achieved significant reductions in turbidity (93-98%), electrical conductivity and total dissolved solids (36-65%), UV254 (74-89%), dissolved organic carbon (68-80%), and trihalomethane formation potential (66.54%). In contrast, the conventional system exhibited limited ion removal and, in some cases, increased ion concentrations. These results indicate that submerged NF membranes offer superior ion rejection and effective control of DBP precursors, demonstrating their potential for producing high-quality drinking water from surface water under stable operating conditions.
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