Achieve efficient nitrogen removal from real sewage in a plug-flow integrated fixed-film activated sludge (IFAS) reactor via partial nitritation/anammox pathway. (September 2017)

• Record Type: Journal Article
• Authors: Yang, Yandong; Zhang, Liang; Cheng, Jun; Zhang, Shujun; Li, Baikun; Peng, Yongzhen
• Is Part Of: Bioresource technology. Volume 239(2017)
• Page Start: 294
• Page End: 301
• Publication Date: 2017-09
• Subjects: Sewage -- Partial nitritation/anammox -- Nitrogen removal -- Integrated fixed-film activated sludge -- Residual ammonium; 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.2017.05.041
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Partial nitritation/anammox was established in an IFAS reactor treating sewage. Efficient nitrogen removal (TNeffluent = 7.9 mg/L and 82% TNremoval ) was achieved. Stable PN/A operation was achieved when residual ammonium was higher than 3 mg/L. Nitrate accumulated and PN/A performance declined when residual ammonium <1 mg/L. Abstract: This study tested the feasibility of plug-flow integrated fixed-film activated sludge (IFAS) reactor in applying sewage partial nitritation/anammox (PN/A) process. The IFAS reactor was fed with real pre-treated sewage (C/N ratio = 1.3) and operated for 200 days. High nitrogen removal efficiency of 82% was achieved with nitrogen removal rates of 0.097 ± 0.019 kg N/(m 3 ·d). Therefore, plug-flow IFAS reactor could be an alternative to applying sewage PN/A process. Besides, it was found that the stability of sewage PN/A process was significantly affected by residual ammonium. Nitrate accumulated in effluent and PN/A performance deteriorated when residual ammonium was below 1 mg/L. On the contrary, long-term stable PN/A operation was achieved when residual ammonium was over 3 mg/L.