Nitrogen removal from low COD/N interflow using a hybrid activated sludge membrane-aerated biofilm reactor (H-MABR). (October 2022)

• Record Type: Journal Article
• Authors: Liu, Hengyi; Li, Lei; Ye, Wenjie; Ru, Lingyu; Liu, Guotao; Peng, Xuya; Wang, Xiaoming
• Is Part Of: Bioresource technology. Volume 362(2022)
• Publication Date: 2022-10
• Subjects: Hybrid activated sludge membrane-aerated biofilm reactor -- Interflow -- Low COD/N ratio -- Nitrogen removal -- Simultaneous nitrification–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.2022.127855
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: An H-MABR was built to treat low COD/N wastewater. The H-MABR achieved stable operation at COD/N = 4–1.5. SND played an important role in nitrogen removal. High diversity and abundance of denitrification genes maintained high process efficiency. Abstract: A hybrid activated sludge membrane-aerated biofilm reactor based on a two-stage simultaneous nitrification–denitrification (SND) process was built, and its utility for treating interflow with low chemical oxygen demand (COD)/total nitrogen (TN) (COD/N) was explored. The operating performance, functional microbial communities, and functional genes for nitrogen metabolism were evaluated at low COD/N (4–1.3). The reactor could achieve stable operation at COD/N = 4–1.5, and the removal efficiency of COD, TN, and ammonia nitrogen was stable at 90.30 ± 2.36 %, 85.69 ± 2.22 %, and 89.52 ± 6.06 %, respectively. The SND rates were 70.89 % and 50.75 % when influent COD/N was 2.0 and 1.7, respectively, indicating that SND makes an important contribution to nitrogen removal under these two COD/N conditions. Microbial analysis revealed that the sampling sites with a high abundance of denitrification genes in the outer ring experienced aerobic conditions, inferring that aerobic denitrification also plays an important role in denitrification.