Department of Environmental Engineering, Inha University, Namgu Yonghyun dong 253, Incheon, Republic of Korea.
Department of Environmental Engineering, Inha University, Namgu Yonghyun dong 253, Incheon, Republic of Korea.
Bioresour Technol. 2017 Sep;240:106-114. doi: 10.1016/j.biortech.2017.02.086. Epub 2017 Feb 21.
This study aims to better understand biofouling by algal organic matters (AOM) during seawater pretreatment by microfiltration (MF). To simulate AOM biofouling, sodium alginate (SA) solutions with three different concentrations (2, 20 and 50ppm) were filtered in dead-end mode with MF membrane. A modelling approach with blocking laws was used to identify the fouling mechanisms behind flux decline with time. The effect of SA concentration and cations such as Na (0.6M) and Ca (0.015M) addition to SA solution on fouling mechanisms was studied. While for low SA concentration (2ppm), fouling occurs within two phases: a pore constriction phase followed by cake formation phase, for high SA concentration (50ppm), fouling occurs within only one phase controlled by cake formation. The addition of Na (0.6M) or Ca (0.015M) to SA solution mitigates membrane fouling, however, the addition of both cations enhances fouling by formation of dense cake layer on membrane.
本研究旨在通过微滤（MF）更好地了解海水中预处理过程中藻类有机物质（AOM）引起的生物污垢。为了模拟 AOM 生物污垢，通过死端模式用 MF 膜过滤三种不同浓度（2、20 和 50ppm）的海藻酸钠（SA）溶液。采用具有阻塞定律的建模方法来确定通量随时间下降背后的污垢机理。研究了 SA 浓度以及向 SA 溶液中添加阳离子（例如 Na（0.6M）和 Ca（0.015M））对污垢机理的影响。对于低 SA 浓度（2ppm），污垢发生在两个阶段内：孔堵塞阶段后是滤饼形成阶段，而对于高 SA 浓度（50ppm），污垢仅在由滤饼形成控制的一个阶段内发生。向 SA 溶液中添加 Na（0.6M）或 Ca（0.015M）可以减轻膜的污垢，但是，同时添加两种阳离子会通过在膜上形成致密的滤饼层而加剧污垢。
