文献类型：期刊文献

英文题名：Integration of membrane bioreactor with a weak electric field: Mitigating membrane fouling and improving effluent quality targeting low energy consumption

作者：Niu, Bihui[1];Zhang, Meng[2];Meng, Shujuan[1];Mao, Zhongyuan[1];Liang, Dawei[1];Fan, Wenhong[1];Yang, Linyan[3];Dong, Zhekang[4];Liao, Yuan[5];Wang, Jianyou[5];Liu, Yu[6]

机构：[1]Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China;[2]Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China;[3]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[4]Hangzhou Dianzi Univ, Sch Elect & Informat, Zhejiang Prov Key Lab Equipment Elect, Hangzhou, Peoples R China;[5]Nankai Univ, Coll Environm Sci & Engn, Tianjin Key Lab Environm Technol Complex Transmedi, Tianjin 300071, Peoples R China;[6]Nankai Univ, Coll Environm Sci & Engn, Engn Lab Low Carbon Unconvent Water Resources Util, Tianjin 300350, Peoples R China

年份：2024

卷号：495

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20240184778);WOS:【SCI-EXPANDED(收录号:WOS:001320659900001)】；

基金：This program is supported by the Natural Science Foundation of China (52270019) and Beijing Natural Science Foundation (8222065) .

语种：英文

外文关键词：Weak electric field; Membrane reactor; Membrane fouling; Microbial metabolism; Lower energy consumption

摘要：The electrical assisted MBR (EMBR) has been employed to improve the water quality and solve the fouling problem. However, advanced material-based electrodes or high operation voltage bring difficulties for the practical application of EMBR. Herein, a weak electric field generated by titanium electrodes was employed to establish an EMBR and the fouling mechanism was investigated in detail. The results showed that introduction of a weak electric field at voltage of 0.1 V/cm and current density of 7 mu A/cm(2) efficiently decreased the extra- cellular polymeric substances (EPS) content by over 40 % as such extended the service time of MBR by more than 20 %. Specifically, the weak electric field reduced the relative abundance of Bacteroidetes, , known for secreting proteinaceous EPS, by 38.61 %, and increased relative abundance of Patescibacteria with EPS decomposition by 6.73 times, thus effectively reducing the EPS concentration. Further KEGG pathway analysis revealed that electric field accelerated enzymatic reactions and promoted microbial metabolism of carbohydrate and amino acid. Furthermore, this weak field reduced the sludge deposition on membrane by increase of the electrostatic repulsion and the irreversible fouling was mediated. According to the composition of the fouling layer, a corresponding cleaning scheme was applied. This EMBR consistently produced high-quality effluent in all cycles, with 99.31 % COD, 98.73 % NH4+-N, 85.87 % TP and 92.66 % TN removals. In conclusion, the weak electric field endow EMBR exceptional anti-fouling ability and superior effluent quality under lower energy consumption.