Coupling anammox with denitrification in a full-scale combined biological nitrogen removal process for swine wastewater treatment

• Published in: Bioresource technology 2021-06, Vol.329, p.124906, Article 124906
• Main Authors: Chen, Yanlin, Zheng, Rui, Sui, Qianwen, Ritigala, Tharindu, Wei, Yuansong, Cheng, Xiangqian, Ren, Jiehui, Yu, Dawei, Chen, Meixue, Wang, Tuo
• Format: Article
• Language: English
• Subjects: Anammox; Animals; Bioreactors; COD/NO– 3-N ratio; Combined biological nitrogen removal; Denitrification; Nitrogen; Oxidation-Reduction; Sewage; Swine; Waste Water; Water Purification
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2021.124906

In order to enhance nitrogen removal through anammox process in the full-scale swine wastewater treatment plant, an innovative regulation strategy of nitrate-based carbon dosage and intermittent aeration was developed to apply the combined biological nitrogen removal process in a full scale anaerobic-anoxic–oxic (A2/O) system. TN removal efficiency reached at 65.5 ± 6.0% in Phase 1 with decreasing external carbon dosage in influent due to the reduction of return nitrate concentration, and it increased to 83.5 ± 6.7% when intermittent aeration was adopted in oxic zone and external carbon source was stopped adding into influent in Phase 2. As a result, the energy consumption for the swine wastewater treatment decreased from 1.93 to 0.9 kW h/m3 and 4.18 to 2.57 kW h/kg N, respectively. Microbial community analysis revealed that the average abundances of Candidatus Brocadia increased from 0.76% to 2.43% and removal of TN through anammox increased from 39% to 77%.