College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding, 071002, China.
College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China.
Chemosphere. 2021 Jan;262:128405. doi: 10.1016/j.chemosphere.2020.128405. Epub 2020 Sep 24.
This study focused on the fouling characteristics evaluation of the sludge in a membrane bioreactor integrated with microbial fuel cell (MFC-MBR) to reveal the mechanisms of membrane fouling mitigation. The filtration of soluble microbial products (SMPs) in MFC-MBR showed lower flux decline rate than those in the control system (C-MBR). Based on the extended Derjaguin-Landau-Verwey-Overbeek analysis, decreases in free energies of adhesion between the SMPs and clean membrane or SMP-fouled membrane were observed in MFC-MBR. When approaching the clean membrane or SMP-fouled membrane, the SMPs in MFC-MBR had to overcome a higher energy barrier compared to those in C-MBR, indicating the inhibition of adsorption of SMPs on the membrane surface in MFC-MBR. Additionally, sludge flocs in MFC-MBR exhibited lower hydrophobicity and were less negative surface charged in comparison to those in the C-MBR. In MFC-MBR, the sludge flocs approaching the clean membrane, SMP-fouled membrane and cake layer all experienced higher energy barriers and lower secondary energy minimums compared to those in C-MBR, exhibiting the lower potential of cake layer formation. These results confirmed that decreases of the fouling potentials of SMPs and sludge flocs were essential for the membrane fouling mitigation in the MFC-MBR.
本研究聚焦于膜生物反应器与微生物燃料电池（MFC-MBR）集成系统中污泥的污染特性评估，以揭示减轻膜污染的机制。与对照系统（C-MBR）相比，MFC-MBR 中可溶性微生物产物（SMP）的过滤表现出更低的通量下降率。基于扩展的德热那广义 Landau-Verwey-Overbeek 分析，观察到在 MFC-MBR 中，SMP 与清洁膜或 SMP 污染膜之间的粘附自由能降低。当 SMP 接近清洁膜或 SMP 污染膜时，与 C-MBR 相比，MFC-MBR 中的 SMP 必须克服更高的能量障碍，表明 MFC-MBR 中 SMP 在膜表面的吸附受到抑制。此外，与 C-MBR 相比，MFC-MBR 中的污泥絮体表现出较低的疏水性和较少的负表面电荷。在 MFC-MBR 中，与 C-MBR 相比，接近清洁膜、SMP 污染膜和滤饼层的污泥絮体都经历了更高的能量障碍和更低的二次能量最小值，表明滤饼层形成的潜力较低。这些结果证实，降低 SMP 和污泥絮体的污染潜力对于 MFC-MBR 中的膜污染缓解至关重要。
