School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China; School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China.
Bioresour Technol. 2017 Nov;243:667-675. doi: 10.1016/j.biortech.2017.06.173. Epub 2017 Jul 1.
Improving the stimulation effect of electric current density (ECD) on microbial community is critical in designing and operating TDE-BAF. This study investigated the effect of ECD at 0.00, 4.08, 6.12, 12.20, 14.25, 16.30 and 20.20A·m on the removal performance, diversity and structure of microbial community in TDE-BAF. Results indicated that the ECD of 14.25A·m exhibited the highest COD, TOC and NH-N average removal rates with 93.33%, 91.26% and 93.87%, respectively; Under high ECD, especially exceeding 14.25A·m, the inhibition of growth and activity because of plasmatorrhexis was in agreement with the sharp biomass decline; there was no significant relation between community richness and diversity and removal efficiency below optimum ECD, while above optimal ECD, it was just the opposite; Microbial communities mainly including Hydrogenophaga, Saprospiraceae_uncultured, Delftia, Enterobacter, Pseudomonas, Pseudoxanthomonas, and Nitrosospira and physicochemical properties well explained the excellent removal performance at the optimum ECD.
提高电流密度（ECD）对微生物群落的刺激效果是设计和运行 TDE-BAF 的关键。本研究考察了 ECD 在 0.00、4.08、6.12、12.20、14.25、16.30 和 20.20A·m 对 TDE-BAF 中微生物群落去除性能、多样性和结构的影响。结果表明，14.25A·m 的 ECD 表现出最高的 COD、TOC 和 NH-N 平均去除率，分别为 93.33%、91.26%和 93.87%；在高 ECD 下，特别是超过 14.25A·m 时，由于质壁分离导致的生长和活性抑制与生物量的急剧下降一致；在最佳 ECD 以下，群落丰富度和多样性与去除效率之间没有显著关系，而在最佳 ECD 以上，则恰恰相反；微生物群落主要包括氢噬菌属、未培养的 Saprospiraceae、德氏菌属、肠杆菌属、假单胞菌属、假单胞菌属、硝化螺旋菌属和理化性质，很好地解释了最佳 ECD 下的优异去除性能。
