Tomczak Wirginia, Gryta Marek
Faculty of Chemical Technology and Engineering, Bydgoszcz University of Science and Technology, 3 Seminaryjna Street, 85-326 Bydgoszcz, Poland.
Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, ul. Pułaskiego 10, 70-322 Szczecin, Poland.
Membranes (Basel). 2021 Dec 17;11(12):988. doi: 10.3390/membranes11120988.
Application of the membrane distillation (MD) process for the treatment of high-salinity solutions contaminated with oil and surfactants represents an interesting area of research. Therefore, the aim of this study is to investigate the effect of low-concentration surfactants in oil-contaminated high-salinity solutions on the MD process efficiency. For this purpose, hydrophobic capillary polypropylene (PP) membranes were tested during the long-term MD studies. Baltic Sea water and concentrated NaCl solutions were used as a feed. The feed water was contaminated with oil collected from bilge water and sodium dodecyl sulphate (SDS). It has been demonstrated that PP membranes were non-wetted during the separation of pure NaCl solutions over 960 h of the module exploitation. The presence of oil (100-150 mg/L) in concentrated NaCl solutions caused the adsorption of oil on the membranes surface and a decrease in the permeate flux of 30%. In turn, the presence of SDS (1.5-2.5 mg/L) in the oil-contaminated high-salinity solutions slightly accelerated the phenomenon of membrane wetting. The partial pores' wetting accelerated the internal scaling and affected degradation of the membrane's structure. Undoubtedly, the results obtained in the present study may have important implications for understanding the effect of low-concentration SDS on MD process efficiency.
采用膜蒸馏（MD）工艺处理受油和表面活性剂污染的高盐溶液是一个有趣的研究领域。因此，本研究的目的是探讨油污染高盐溶液中低浓度表面活性剂对MD工艺效率的影响。为此，在长期MD研究中对疏水性毛细管聚丙烯（PP）膜进行了测试。以波罗的海海水和浓缩NaCl溶液作为进料。进料水被取自舱底水的油和十二烷基硫酸钠（SDS）污染。结果表明，在模块运行960小时以上的纯NaCl溶液分离过程中，PP膜未被润湿。浓缩NaCl溶液中油（100 - 150 mg/L）的存在导致油吸附在膜表面，渗透通量降低了30%。反过来，油污染高盐溶液中SDS（1.5 - 2.5 mg/L）的存在略微加速了膜润湿现象。部分孔隙的润湿加速了内部结垢并影响了膜结构的降解。毫无疑问，本研究获得的结果对于理解低浓度SDS对MD工艺效率的影响可能具有重要意义。
