Brackish water treatment research in pilot scale using dual-stage nano filtration for domestic/ drinking water supply in Thu Bon river basin
Abstract
Due to the impact of climate change, the process of salinity intrusion occurs frequently in coastal areas of Vietnam. Therefore, the main objective of this study is to evaluate the brackish water treatment capacity of different nanofiltration (NF) processes for domestic and drinking water supply for residential areas in Thu Bon river basin, where the salinity varies significantly within seasons. Results have shown that during season change when the river’s salinity increases up to 17.5‰, application of dual-stage NF is most appropriate. The energy costs were 8.28 and 33.4 $/m3 with salt concentrations of 1-6‰ and 6-12.5‰, respectively. This dual-stage NF process not only guarantees the effluent quality to meet National Technical Regulation on potable water (QCVN 01:2009/BYT), but also offers reasonable energy cost and finally can heip to prolong the membrane lifespan.
Keywords: Drinking water treatment, dual-stage nanofiltration, Brackish water, variation of salinity with seasons.
Received: July 13th, 2017; revised: August 10th, 2017; accepted: November 2nd, 2017
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