十二烷基硫酸钠对正向渗透膜污染及其清洗的影响。
Effects of sodium dodecyl sulfate on forward osmosis membrane fouling and its cleaning.
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Zhuoyuan Water-Ecological Environmental Engineering Co., Ltd, Shanghai, 200003, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
出版信息
Chemosphere. 2020 Oct;257:127180. doi: 10.1016/j.chemosphere.2020.127180. Epub 2020 May 25.
Effect of sodium dodecyl sulfate (SDS) on the fouling of a commercial aquaporin based biomimetic forward osmosis (FO) membrane was investigated. Increasing draw solution (DS) concentration and decreasing the cross-flow velocity could aggravate the membrane fouling, and the effect of the latter was greater than the former. SDS as a surfactant could wash away some sodium alginate (SA) and calcium chloride (CaCl) which were adsorbed on the surface of the membrane. However, SA and CaCl tended to form irreversible fouling when SDS had already been on the membrane. When SDS + SA + CaCl was used as the feed solution (FS), SDS was first adsorbed on the membrane surface and then SA and CaCl interact with SDS; irreversible fouling was formed when the hydrophobic tail of the SDS was adsorbed to the SA, and reversible fouling was formed while Ca (bridged with SA) was bound with the hydrophilic head of the SDS. Afterwards, the cleaning effects of HCl and NaOH solutions on the membrane fouling caused by SDS were studied. The initial normalized flux could be recovered to 0.88 using both methods. Cleaning with HCl solution could slow down the formation of membrane fouling, while cleaning with NaOH solution could damage the aquaporin in the active layer of the membrane.
研究了十二烷基硫酸钠（SDS）对商用水通道蛋白仿生正向渗透（FO）膜污染的影响。增加汲取液（DS）浓度和降低错流速度会加剧膜污染，后者的影响大于前者。作为表面活性剂的 SDS 可以冲洗掉一些吸附在膜表面的海藻酸钠（SA）和氯化钙（CaCl）。然而，当 SDS 已经存在于膜上时，SA 和 CaCl 容易形成不可逆的污染。当 SDS+SA+CaCl 用作进料溶液（FS）时，SDS 首先被吸附在膜表面上，然后 SA 和 CaCl 与 SDS 相互作用；当 SDS 的疏水尾被吸附到 SA 上时，形成不可逆的污染，而 Ca（与 SA 桥接）与 SDS 的亲水头结合时形成可逆的污染。随后，研究了 HCl 和 NaOH 溶液对 SDS 引起的膜污染的清洗效果。两种方法都可以将初始归一化通量恢复到 0.88。HCl 溶液清洗可以减缓膜污染的形成，而 NaOH 溶液清洗会损坏膜活性层中的水通道蛋白。
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