Evaluation of bio-energy recovery from the anaerobic treatment of municipal wastewater by a pilot-scale submerged anaerobic membrane bioreactor (AnMBR) at ambient temperature. (November 2021)

• Record Type: Journal Article
• Authors: Kong, Zhe; Li, Lu; Wu, Jiang; Wang, Tianjie; Rong, Chao; Luo, Zibin; Pan, Yang; Li, Dapeng; Li, Yong; Huang, Yong; Li, Yu-You
• Is Part Of: Bioresource technology. Volume 339(2021)
• Publication Date: 2021-11
• Subjects: AnMBR -- Anaerobic digestion -- Pilot-scale -- Municipal wastewater -- Energy recovery -- Carbon neutrality; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125551
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: A pilot-scale AnMBR with 5 m 3 succeeded in treating municipal wastewater at 25 °C. Stable biogas yield and organic removel are obtained during long-term operation. Theoretical net energy potential was 0.174 kWh/m 3 and bio-energy recovered by 69%. Practical net energy potential was −0.014 kWh/m 3 and bio-energy recovered by −8%. The AnMBR exhibited promising net energy potential compared with the CAS process. Abstract: The potential of bio-energy recovery from real municipal wastewater was investigated using a one-stage pilot-scale submerged anaerobic membrane bioreactor (AnMBR) for a range of HRTs from 24 h to 6 h at ambient temperature around 25 °C. This pilot-scale AnMBR demonstrated a high COD removal efficiency of over 90% during an operation of 217 days for municipal wastewater treatment. The energy balance of the AnMBR was calculated from both theoretical and practical aspects. The theoretical net energy potential was calculated as 0.174 kWh/m 3 by applying operational data to empirical equations, obtaining a bio-energy recovery efficiency of 69.4%. The practical net energy potential was estimated as −0.014 kWh/m 3 using the powers of engines applied in a full-scale wastewater treatment plant. This is considerably lower than that of the conventional activated sludge process. These results are evidence of the potential of the AnMBR and feasibility in the treatment of municipal wastewater treatment.