Performance and microbial community of a novel non-aeration-based up-flow bioelectrochemical filter (UBEF) treating real domestic wastewater

作者：Nuan Yang, Guoqiang Zhan, Daping Li, Xiaohong He, Yanyan Zhang, Qinrui Jiang, Hong Liu, Chuan Wang · 发表于：Chemical Engineering Journal · 年份：2018 · DOI：10.1016/j.cej.2018.04.200 · 被引用次数：57 · 研究领域：Microbial Fuel Cells and Bioremediation、Wastewater Treatment and Nitrogen Removal、Membrane-based Ion Separation Techniques

Domestic wastewater treatment process via the activated sludge is complicated, energy-negative and potentially harmful. In this study, an up-flow bioelectrochemical filter reactor (UBEF) was designed without positive aeration in-priority for treating real domestic wastewater under different hydraulic retention times (HRTs). The removal of chemical oxygen demand (COD), ammonia and total nitrogen was attained at a high efficiency of 89%, 99% and 99% respectively, when HRT was set at h1 of ∼2.53 d. However, with the decreased of HRT from 2.53 to 0.28 d, the removal efficiency of nitrogen and COD decreased to 50% and 40% respectively, but the maximum power density increased from 3.01 to 98.90 mW/m 3 with a low Coulombic efficiency of 0.25–1.51%. The results demonstrated that the UBEF can remove COD and ammonia from real domestic wastewater in an aeration-free energy sustainable process, although its power output was low. Moreover, the functional bacteria were detected using 16S rRNA gene-based pyrosequencing analysis, which showed that the microbial communities were different under varied HRT conditions. The Thauera -dominated consortium was inoculated in order to enhance the removal of pollutants and the generation of electricity from domestic wastewater, it was kept at a relative abundance when continuously feeding the real wastewater. In particular, nitrogen removing bacteria (NRB) including Nitrosomonas , Ignavibacterium , Thiobacillus , Dokdonella , Comamonas, Sterolibacteri...