Nitrogen removal and nitrogen functional gene abundances in three subsurface wastewater infiltration systems under different modes of aeration and influent C/N ratios. (October 2017)

• Record Type: Journal Article
• Authors: Pan, Jing; Qi, Shiyue; Sun, Yafei; Jiang, Yingying; Zhao, Ning; Huang, Linli; Sun, Yining
• Is Part Of: Bioresource technology. Volume 241(2017)
• Page Start: 1162
• Page End: 1167
• Publication Date: 2017-10
• Subjects: C/N ratio -- Aeration mode -- Nitrogen -- Nitrogen functional gene; 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.2017.05.112
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: C/N ratio and aeration mode significantly affected nitrogen removal. High C/N ratio of 12 and TN removal rate were achieved in the aerated SWIS. Aeration raised amoA, nxrA, narG, napA, nirK, nirS, qnorB and nosZ abundances. Abstract: Matrix DO, nitrogen removal and nitrogen functional gene abundances in non-aerated (NA), continuously aerated (CA) and intermittently aerated (IA) subsurface wastewater infiltration systems (SWISs) under different influent C/N ratios were studied. Aeration created aerobic condition in 50 cm depth and did not change anoxic or anaerobic condition in 80 and 110 cm depths, which enhanced NH4 + -N and TN removal and the enrichment of nitrogen removal functional genes (amoA, nxrA, narG, napA, nirK, nirS, qnorB and nosZ) compared to NA SWIS, especially under high influent C/N ratio. High TN removal rate (89.6%) was obtained in IA SWIS under the influent C/N ratio of 12, which was higher than that in CA SWIS (87.1%). The results suggested that intermittent aeration was a reliable option to achieve high TN removal in SWISs, especially under high influent C/N ratio.