Efficient nitrogen removal from stormwater runoff by bioretention system: The construction of plant carbon source-based heterotrophic and sulfur autotrophic denitrification process. (April 2022)

• Record Type: Journal Article
• Authors: Li, Haiyan; Liu, Zhaoying; Tan, Chaohong; Zhang, Xiaoran; Zhang, Ziyang; Bai, Xiaojuan; Wu, Liyuan; Yang, Hua
• Is Part Of: Bioresource technology. Volume 349(2022)
• Publication Date: 2022-04
• Subjects: Bioretention system -- Plant carbon source -- Nitrogen removal -- Sulfur autotrophic -- Mixotrophic denitrification; 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.2022.126803
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Synergistic reaction mechanism between plant carbon source and sulfur in upper and lower layer of internal water storage zone. Highlights: The mixotrophic denitrification process was constructed in bioretention systems. The plant carbon source and sulfur established more suitable pH, DO, and ORP. The synergistic effect existed between acetic acid and the generated SO4 2- . Thiobacillus dominated in the upper layer and improved autotrophic denitrification. Abstract: The plant carbon source and sulfur were selected as the denitrification electron donors and filled in the internal water storage zone (IWSZ) of bioretention system to establish excellent mixotrophic denitrification system, which was beneficial to waste recycling and showed very high nitrate nitrogen removal efficiency (approximately 94%). The ammonia nitrogen, total nitrogen, and chemical oxygen demand removal efficiencies could reach 79.41%, 85.89%, and 74.07%, respectively. Mechanism study revealed the synergistic degradation effect was existed between acetic acid released from plant carbon source and the generated sulfate, which improved the S/CH3 COOH mediated nitrate nitrogen removal reactions. Autotrophic denitrification occurred mainly in the upper layer of IWSZ, and the dominant bacteria were Thiobacillus . While in the lower layer, the dominant bacteria were mainly related to organic matter utilization and heterotrophic denitrification. The abundance of narG, nirK, nirS, and nosZ functional genes in the upper layer was significantly higher than the lower layers.