King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Division of Biological & Environmental Science & Engineering (BESE), Thuwal 23955-6900, Saudi Arabia.
King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Division of Biological & Environmental Science & Engineering (BESE), Thuwal 23955-6900, Saudi Arabia.
Water Res. 2016 Oct 1;102:485-493. doi: 10.1016/j.watres.2016.06.055. Epub 2016 Jul 1.
This study investigated the impact of coagulation on the transformation between colloidal and particulate transparent exopolymer particles (TEP) in seawater; and the effectiveness of a combined pretreatment consisting of coagulation and UF on minimizing TEP fouling of seawater reverse osmosis (SWRO) membranes. Coagulation with ferric chloride at pH 5 substantially transformed colloidal TEP (0.1-0.4) into particulate TEP (>0.4) leading to a better membrane fouling control. Both 50 and 100 kDa molecular weight cut-off (MWCO) UF membranes removed most of particulate and colloidal TEP without the assistance of coagulation, but coagulation is still necessary for better UF fouling control. The improvement of combined SWRO pretreatment with coagulation and 50 kDa UF membranes was not that much significant compared to UF pretreatment with 50 KDa alone. Therefore, the minimal coagulant dosage for seawater containing TEP should be based on the UF fouling control requirements rather than removal efficiency.
本研究考察了胶凝作用对海水中胶体和颗粒状透明胞外聚合物颗粒（TEP）之间转化的影响；以及混凝和超滤联合预处理对最小化海水反渗透（SWRO）膜中 TEP 污染的有效性。在 pH 值为 5 时用三氯化铁进行混凝，可将胶体 TEP（0.1-0.4）大量转化为颗粒状 TEP（>0.4），从而更好地控制膜污染。50 和 100 kDa 分子量截止（MWCO）超滤膜可去除大部分颗粒状和胶体状 TEP，而无需混凝的帮助，但为了更好地控制超滤污染，混凝仍很有必要。与单独使用 50 kDa UF 预处理相比，采用混凝和 50 kDa UF 膜的联合 SWRO 预处理的改善程度并不显著。因此，含 TEP 的海水所需的最小混凝剂量应基于超滤污染控制要求，而不是去除效率。
