A novel simultaneous partial nitrification, anammox, denitrification and fermentation process: Enhancing nitrogen removal and sludge reduction in a single reactor. (February 2023)

• Record Type: Journal Article
• Authors: Ma, Guocheng; Yu, Deshuang; Zhang, Jianhua; Miao, Yuanyuan; Zhao, Xinchao; Li, Jiawen; Zhang, Yu; Dong, Guoqing; Zhi, Jiaru
• Is Part Of: Bioresource technology. Volume 369(2023)
• Publication Date: 2023-02
• Subjects: Mainstream anammox -- Fermentation -- Denitrification -- Single-stage process -- Dissolved oxygen -- Intermittent aeration; 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.2022.128484
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Novel SNADF process with high TN removal of 92.8% was achieved in a single reactor. Advanced nitrogen removal and sludge reduction were simultaneously achieved. Fermentation stopped at acidogenesis stage and promoted partial denitrification. Increased DO promoted nitrogen removal while had negative effect on sludge reduction. Abstract: This study verified the feasibility of simultaneous partial nitrification, anammox, denitrification and fermentation process under intermittent aeration in a single reactor, and explored the impact of dissolved oxygen (DO) on the synergy between fermentation and nitrogen removal. An advanced nitrogen removal efficiency of 92.8 % and a low observed sludge yield of 0.0268–0.1474 kgMLSS/kgCOD were achieved. In-situ test showed that nitrate and ammonium decreased synchronously in the absence of organic matter, indicating the possibility of simultaneous partial denitrification, anammox and fermentation. Additionally, the abundance of functional genes for acetate production was 66, 894 hits, while the key genes relevant to methanogenesis were only 348 hits, which suggested that fermentation might stop at the acid-producing stage and promote partial denitrification-anammox reaction, achieving simultaneous sludge reduction and advanced nitrogen removal performance. When DO increased from 0.1–0.3 to 0.4–0.6 mg/L, the nitrogen removal efficiency was increased (63.9 %→92.8 %) while sludge reduction was negatively affected.