A mainstream anammox fixed-film membrane bioreactor with novel sandwich-structured carriers for fast start-up, effective sludge retention and membrane fouling mitigation. (March 2022)

• Record Type: Journal Article
• Authors: Zhang, Meng; Gu, Jun; Wang, Siyu; Liu, Yu
• Is Part Of: Bioresource technology. Volume 347(2022)
• Publication Date: 2022-03
• Subjects: Mainstream anammox -- Fixed-film membrane bioreactor -- Carriers -- Membrane fouling -- Sludge retention; 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.2021.126370
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A fixed-film MBR with sandwich-structured carrier was developed for mainstream anammox. Fast start-up of anammox with almost no lag phase was achieved in the fixed-film MBR. Anammox biomass was effectively remained in sandwich-structured carrier. Anammox biomass locked in carriers favoured mitigation of membrane fouling. Candidatus Kuenenia as dominant anammox bacteria were successfully enriched. Abstract: Novel sandwich-structured carriers were developed for fast immobilizing anammox sludge, with which a fixed-film membrane bioreactor was further established for treating municipal wastewater. Results showed that fast start-up of the fixed-film reactor with anammox bacteria could be achieved without lag phase, indicated by the respective nitrogen removal efficiency and rate of 70.58 ± 0.66% and 0.12 g N/(L·d). Meanwhile, low membrane fouling 0.0017 bar/hour was also observed. The activity of anammox sludge fixed in the novel carriers gradually stabilized at the level of 6.59 mg N/(g VSS·h), while Candidatus Kuenenia as the dominant anammox bacteria were enriched from the initial abundance of 15.16% to 39.12% after a long-term operation. Consequently, it was demonstrated that the sandwich-structured carriers developed in this study could offer a promising alternative for fast immobilization and start-up of mainstream anammox process.