Study on different ultrafiltration-based hybrid pretreatment systems for reverse osmosis desalination
作者： Chen Sun , Lixin Xie , Xiaowei Li , Lei Sun , Haiping Dai
DOI: 10.1016/J.DESAL.2015.05.020
关键词: Filtration 、 Polyvinylidene fluoride 、 Effluent 、 Chromatography 、 Ultrafiltration 、 Seawater 、 Turbidity 、 Reverse osmosis 、 Flocculation 、 Chemistry
摘要: Abstract Performance of different pretreatment systems with ultrafiltration (UF) prior to reverse osmosis (RO) for desalting seawater was assessed in this paper. The pilot trial operated on from Bohai Bay Tianjin using polyvinylidene fluoride (PVDF) hollow fiber UF membrane. During these experiments, membrane specific flux (SF) calculated evaluate the performance UF. Results research showed that a chemical enhanced backwash (CEB) period, combination FeCl3 flocculation helpful controlling decrease SF during operation. Besides, result also flocculation/dual-stage sand filtration/UF performed effectively terms stable CEB period than flocculation/UF alone. In addition, water analysis regularly quantify pollutants effluents hybrid processes. According experiment, can provide product consistently low turbidity (0.07–0.12 NTU) and silt density index (SDI15 less 2) levels regardless quality. Sand filtration good removal (less 0.5 NTU effluent), but limited effect SDI (not below 4). Total organic carbon (TOC) up 28% obtained system.
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