Important effects of temperature on treating real municipal wastewater by a submerged anaerobic membrane bioreactor: Removal efficiency, biogas, and microbial community

Jiayuan Ji, Jialing Ni, Akito Ohtsu, Naoko Isozumi, Yisong Hu, Runda Du, Yujie Chen, Yu Qin, Kengo Kubota, Yu You Li

Research output: Contribution to journalArticlepeer-review

Abstract

A submerged anaerobic membrane bioreactor (SAnMBR) was used in the treatment of real municipal wastewater at operation temperatures ranging from 15 °C to 25 °C and hydraulic retention time (HRT) of 6 h. The treatment process was evaluated in terms of organic removal efficiency, biogas production, sludge growth and membrane filtration. During long-term operation, the SAnMBR achieved chemical oxygen demand removal efficiencies of about 90% with a low sludge yield (0.12–0.19 g-VSS/g-CODrem) at 20–25 °C. Approximately 1.82–2.27 kWh/d of electric energy was generated during the wastewater treatment process at 20–25 °C, 0.67 kWh/d was generated at 15 °C. The microbial community analysis results showed that microbial community was dominated by aceticlastic methanogens, coupled by hydrogenotrophic methanogens and a very small quantity of methylotrophic methanogens. It was also shown that the stabilization of the microbial community could be attributed to the carbohydrate-protein degrading bacteria and the carbohydrate degrading bacteria.

Original languageEnglish
Article number125306
JournalBioresource Technology
Volume336
DOIs
Publication statusPublished - 2021 Sep

Keywords

  • Anaerobic membrane bioreactor
  • Biogas energy
  • Microbial community
  • Operation temperature
  • Real municipal wastewater

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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