3 years ago

High-Performance Forward Osmosis Membranes Used for Treating High-Salinity Oil-Bearing Wastewater

High-Performance Forward Osmosis Membranes Used for Treating High-Salinity Oil-Bearing Wastewater
Qingshan Niu, Yunxia Hu, Like Zhong, Xiaochan An, Shanshan Xu, Zhenbo Wang, Pengfei Lin
Forward osmosis (FO), which is an emerging osmotic driving membrane separation process, can be directly used in high-salinity oil-bearing (HSOB) wastewater treatment. In this study, the thin film composite (TFC) polyamide FO membranes were fabricated for HSOB wastewater treatment. The impacts of the draw solution (DS) concentration, cross-flow rate, stirring rate, and membrane orientation on membrane performances were researched. The results indicated that the FO operation mode was better to achieve a stable water flux of TFC membranes as 29 L/(m2 h) under a cross-flow rate of 15 cm/s and 3 M NaCl as the DS, which was 61% higher than the water flux in the unoptimized operating conditions (18 L/(m2 h)). The rejection rate of salt and oil was 99% and 96%. In addition, the effect of different oil concentrations of HSOB wastewater was studied, and the results showed that FO performed well to treat HSOB wastewater when the oil concentration was <700 mg/L.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02917

DOI: 10.1021/acs.iecr.7b02917

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