Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada; Centre for Environmental Health and Engineering (CEHE), Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, United Kingdom.
Bioresour Technol. 2022 Oct;361:127658. doi: 10.1016/j.biortech.2022.127658. Epub 2022 Jul 22.
The feasibility of municipal sewage treatment in laboratory-scale up-flow anaerobic sludge blankets was investigated in this work. Unlike previous studies, granular activated carbon (conductive) or sponge (non-conductive) was introduced to hollow plastic balls as carriers and suspended in the middle and upper layers of the reactors. The two bioreactors were operated at four different hydraulic retention times (stepwise reduced from 24 h to 8 h) for 100 days at ∼18 °C. The conductive-amended treatment was more effective than the non-conductive treatment in enhancing reactor performance. Interestingly, in the reactor containing conductive carriers, microorganisms enriched in the conductive biofilm were also dominant in the suspended sludge. In the reactor containing sponge carriers, the dominant microorganisms differed between the non-conductive biofilm and the suspended sludge. This study underlines that the enrichment of functional microbial communities and the positive impacts of biofilm on suspended sludge are the keys to improving biomethane recovery.
本研究考察了实验室规模上向流厌氧污泥床中城市污水的处理可行性。与以往的研究不同，本研究将颗粒活性炭（导电）或海绵（非导电）引入空心塑料球作为载体，并悬浮在反应器的中上层。两个生物反应器在约 18°C 下以四个不同的水力停留时间（逐步从 24 小时减少到 8 小时）运行了 100 天。导电改性处理比非导电处理更有效地提高了反应器性能。有趣的是，在含有导电载体的反应器中，富集在导电生物膜中的微生物也在悬浮污泥中占主导地位。在含有海绵载体的反应器中，非导电生物膜和悬浮污泥中的优势微生物不同。本研究强调了功能微生物群落的富集以及生物膜对悬浮污泥的积极影响是提高生物甲烷回收的关键。
