Department of Environmental Engineering, Inha University, 100 Inha-ro, Namgu, Incheon, Republic of Korea.
Environ Sci Pollut Res Int. 2019 Jan;26(2):1061-1071. doi: 10.1007/s11356-017-8527-2. Epub 2017 Feb 11.
Gas sparging is used as a traditional way to control membrane fouling in submerged membrane bioreactors (MBRs) in wastewater treatment. However, the gas sparging accounts for the largest fraction in operational cost to run the MBR systems. In this study, membrane fouling was controlled by integrating scouring media with gas sparging to reduce fouling rate at relatively low operational energy. Comparative study was performed using a fluidized membrane reactor treating synthetic feed solutions between polyethylene terephthalate (PET) scouring media (SM) fluidized by gas sparging (GS), liquid recirculation (LR), and combination of them to control membrane fouling. Addition of PET scouring media reduced the gas flow rate by 67% more with 30% less in fouling rate than gas sparing only. Combined usage of gas sparging and liquid recirculation to fluidize the PET scouring media (LR + GS + SM) showed 37% lower in fouling rate than that obtained by the scouring media fluidized by liquid recirculation (LR + SM) only through the reactor. The LR + GS + SM configuration reduced energy consumption by 90% more than that required by gas sparging alone. Mechanical cleaning driven by fluidizing PET scouring media could reduce membrane fouling due to removing deposit of inorganic particles from membrane surface effectively. However, the PET scouring media was not very effective to reduce membrane fouling caused by organic colloids which are expected to contribute pore fouling significantly.
气体搅拌是一种传统的控制污水处理中浸没式膜生物反应器（MBR）膜污染的方法。然而，气体搅拌占 MBR 系统运行成本的最大部分。在这项研究中，通过将冲刷介质与气体搅拌相结合来控制膜污染，以在相对较低的运行能耗下降低污染速率。通过使用气体搅拌（GS）、液体再循环（LR）和两者结合来流化聚酯纤维（PET）冲刷介质（SM）的流化膜生物反应器处理合成进料溶液，对膜污染进行了比较研究。与仅使用气体搅拌相比，添加 PET 冲刷介质可将气体流量减少 67%，污染速率降低 30%。将气体搅拌和液体再循环联合用于流化 PET 冲刷介质（LR + GS + SM）时，与仅通过反应器进行液体再循环流化的冲刷介质（LR + SM）相比，污染速率降低了 37%。LR + GS + SM 构型比单独使用气体搅拌可节能 90%以上。通过流化 PET 冲刷介质驱动的机械清洗可以有效地去除膜表面的无机颗粒沉积物，从而减少膜污染。然而，PET 冲刷介质对于减少有机胶体引起的膜污染效果不是很好，有机胶体预计会对孔隙污染有显著贡献。
