Large pilot-scale submerged anaerobic membrane bioreactor for the treatment of municipal wastewater and biogas production at 25 °C. (January 2021)

• Record Type: Journal Article
• Authors: Kong, Zhe; Wu, Jiang; Rong, Chao; Wang, Tianjie; Li, Lu; Luo, Zibin; Ji, Jiayuan; Hanaoka, Taira; Sakemi, Shinichi; Ito, Masami; Kobayashi, Shigeki; Kobayashi, Masumi; Qin, Yu; Li, Yu-You
• Is Part Of: Bioresource technology. Volume 319(2021)
• Publication Date: 2021-01
• Subjects: Anaerobic digestion -- AnMBR -- Municipal wastewater -- Demonstration, biogas -- Mass balance; 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.2020.124123
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: 5 m 3 large-scale AnMBR realized effluent COD < 50 mg L -1 and BOD5 < 10 mg L -1 . COD and BOD5 removal over 90% with biogas recovered by 0.25–0.27 L g −1 removed COD. An auto-control grille system facilitated AnMBR by removing large-size impurities. 60%-64% of influent COD converted to methane and 20%-26% of that converted to MLSS. Hollow fiber membrane realized an average flux of 0.35 m d -1 at a △TMP of 23.5 kPa. Abstract: The aim of this work was to demonstrate the operation of a large pilot-scale submerged anaerobic membrane bioreactor (5.0 m 3 ) for biogas production from municipal wastewater at ambient temperature of 25 °C. To the best of our knowledge, this is the largest one-stage submerged AnMBR that has ever been reported. This AnMBR realized a hydraulic retention time (HRT) of 6 h and a treatment capacity of 20 m 3 d -1, obtaining excellent effluent quality with COD removal efficiency over 90% and BOD5 removal over 95%. The biogas yield of the AnMBR was 0.25–0.27 L g −1 removed COD and 0.09–0.10 L L -1 raw wastewater. The methane content of the biogas was at the range of 75%-81%. The COD and nitrogen mass balance were also identified based on long-term operation. The hollow-fiber membrane module realized a flux of 2.75–17.83 LMH. An online backwash chemical cleaning system helped to lower the transmembrane pressure timely.