基于MFC电场强化的MBR膜污染控制

Membrane fouling control enhanced by electric field generated by microbial fuel cell

将膜生物反应器(MBR)与微生物燃料电池(MFC)相结合,设计了一种MFC-MBR耦合工艺。对不同运行条件下MFC电场对MBR运行的影响与常规MBR(CMBR)工艺进行了对比。结果表明:以污水为基质的MFC产生的生物弱电场能有效控制膜污染速率,抑制不可逆污染。在不同污泥浓度下,MFC电场对于控制松散胞外聚合物(LB-EPS)中多糖类小分子污染物具有明显的优势,但对紧密胞外聚合物(TB-EPS)的控制并不明显。附加电场后,污泥zeta电位的绝对值分别降低2.7、7.1和4.1 m V,并促进了丝状菌的生长,使污泥絮凝性增强,污泥粒径变大。

A novel microbial fuel cell（MFC） – membrane bioreactor（MBR） integrated process was designed based on the combination of MBR and MFC for the membrane fouling control conducted by the electric field generated from MFC in wastewater treatment. The performances of the integrated process under different operational conditions were investigated and compared with conventional MBR. The results showed that the electric field generated by MFC was conductive to mitigate membrane fouling and prolong membrane filtration interval by controlling the growth of irreversible fouling resistance in the membrane filtration. The electric field had a significant advantage on the suppression of carbohydrate of small formula weight in LB-EPS under various MLSS, while compared with LB-EPS, the concentration of TB-EPS had no significantly change. Under appending electric field, the absolute value of zeta potential was decreased by 2.7, 7.1 and 4.1 m V, respectively, the growth of filamentous bacteria was promoted, and the larger sludge particles were generated through the improved floc aggregation.