Nitrate removal from low carbon-to-nitrogen ratio wastewater by combining iron-based chemical reduction and autotrophic denitrification. (April 2020)

• Record Type: Journal Article
• Authors: Liu, Xiawei; Huang, Manqi; Bao, Shaopan; Tang, Wei; Fang, Tao
• Is Part Of: Bioresource technology. Volume 301(2020)
• Publication Date: 2020-04
• Subjects: Iron -- Hydrogenophaga -- Autotrophic denitrification -- Nitrate -- Low C/N wastewater; 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.2019.122731
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Nitrate removal from low carbon-to-nitrogen ratio wastewater can be well achieved by a novel system. Iron scraps and extractive bacteria showed a synergistic effect on nitrate removal. Hydrogenophaga may play a key role in nitrate removal. Abstract: Nitrate removal from low carbon-to-nitrogen ratio (C/N) wastewater has always been a knotty problem due to the deficiency of organics. Here, a novel iron-based chemical reduction and autotrophic denitrification (ICAD) system was developed. ICAD system could maintain average nitrate removal efficiency of 97.2% for 131 days with feeding 20.3 mg NO3 – -N/L at hydraulic retention time (HRT) of 24 h. The optimal operational conditions was further explored, and results demonstrated that average nitrate removal efficiency of 85.5% and 98.4% could be achieved at HRT of 12 h and 24 h (influent 20.3 mg NO3 – -N/L), while average nitrate removal efficiency could reach 96.3% at optimal HRT of 12 h (influent 10.3 mg NO3 – -N/L). Hydrogenophaga, which can carry out hydrogenotrophic denitrification, showed a positive correlation with nitrate removal efficiency of the ICAD system. Low cost and simple operation make the ICAD system suitable for large-scale application.