Performance evaluation and mechanism of nitrogen removal in a packed bed reactor using micromagnetic carriers at different carbon to nitrogen ratios. (December 2021)

• Record Type: Journal Article
• Authors: Wang, Haiyue; Li, Zhihao; Peng, Ling; Tang, Xi; Lin, Yuan; Yang, Dongli; Geng, Jinju; Ren, Hongqiang; Xu, Ke
• Is Part Of: Bioresource technology. Volume 341(2021)
• Publication Date: 2021-12
• Subjects: Micromagnetic field -- Advanced nitrogen removal -- C/N -- Microbial communities -- Metabolism pathway; 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.2021.125747
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: TN removal was increased by 4.12% with 0.6 mT MMF when C/N = 4. TN removal was increased by 7.06% and 8.06% with 0.3 mT and 0.9 mT MMFs when C/N = 3. Zooglea, Flavobacterium and Denitratisoma proliferated under a micromagnetic field. 0.6 mT enhanced nitrogen metabolism, ABC transporter and two-component system(C/N = 4). 0.3 mT and 0.9 mT increased nitrogen, carbohydrate, and amino acid metabolism(C/N = 3). Abstract: Advanced nitrogen removal of effluent discharged from secondary treatment systems can avoid eutrophication. However, the lack of biodegradable organics limits biodenitrification. Packed bed reactors filled with carriers with different micromagnetic field (MMF) strengths were used to perform tertiary denitrification. The results showed that MMF significantly improved the denitrification performance, especially at low C/N ratios. Total nitrogen (TN) removal was increased by 4.12% with 0.6 mT MMF when C/N = 4 and increased by 7.06% and 8.06% with 0.3 mT and 0.9 mT MMFs when C/N = 3, respectively. Zooglea, Flavobacterium, and Denitratisoma contributed to the advanced denitrification performance under MMF. In addition, 0.6 mT MMF enhanced nitrogen metabolism and ABC transporter protein and two-component system activities of microorganisms under C/N = 4; 0.3 mT and 0.9 mT MMFs increased nitrogen, carbohydrate, and amino acid metabolism and ABC transporter protein activities under C/N = 3. These findings indicate that MMF has great potential for advanced denitrification from secondary effluent.