Key factors governing the performance and microbial community of one-stage partial nitritation and anammox system with bio-carriers and airlift circulation. (March 2021)

• Record Type: Journal Article
• Authors: Chen, Hong; Wang, Hong; Yu, Guanlong; Xiong, Ying; Wu, Haipeng; Yang, Min; Chen, Rong; Yang, Enzhe; Jiang, Changbo; Li, Yu-You
• Is Part Of: Bioresource technology. Volume 324(2021)
• Publication Date: 2021-03
• Subjects: Key factors -- Bio-carriers -- Partial nitritation and anammox (PNA) -- Airlift -- Brocadia; 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.2021.124668
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A high NRE of 70% was obtained by a PNA-AICB with 50 mg-NH4 /L influent. Control of DO and aeration rate were the key factors for the stable operation. A long time was needed for performance recovery via aeration adjustment. Candidatus Brocadia and Nitrosomonas were dominant after the recovery. Activated AOB, dominated AMX, suppressed NOB & controlled HB were vitally important. Abstract: A one-stage airlift internal circulation biofilm reactor was continuously operated for 668 days to treat 50 mg/L of ammonia wastewater to pursue the long-term stability of partial nitritation and anammox (PNA) process. The operational performance and microbial community structure of the biofilm and the flocs were investigated. A nitrogen removal efficiency (NRE) of 70% was obtained successfully at a dissolved oxygen (DO) of 0.05–0.15 mg/L by regulating aeration rate. The microbial analysis indicated Candidatus Brocadia (29.5%) and Nitrosomonas (6.8%) were dominant in both biofilms and flocs. It was found that DO control and aeration rate were the key factors in performance stability, and a stable performance could be recovered and maintained under oxygen-limiting conditions. Further, the achievement of activated ammonia oxidation bacteria (AOB), dominated anammox bacteria (AMX), suppressed NOB, and controlled heterotrophic bacteria (HB) in the biofilms played a major role in the long-term stable operation.