The accumulation characteristics of NO and N2O in A/O-SBR for treating ammonium-rich organic wastewater. Issue 1 (1st February 2022)

• Record Type: Journal Article
• Authors: Zhao, Junkai; Zhao, Jianqiang; Huang, Ting; Ma, Xiaoqing; Yan, Chunxiao; Xie, Shuting; Lei, Shuhan
• Is Part Of: IOP conference series. Volume 983:Issue 1(2022)
• Publication Date: 2022-02-01
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/983/1/012099
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: The emissions of NO and N2 O during biological nitrogen removal harm the environment. In this study, a sequencing batch reactor (SBR) was used to treat ammonium-rich organic wastewater. The nitrogen transformation and characteristics of NO and N2 O accumulation in typical cycles under different nitrification conditions were monitored, and the mechanisms of NO and N2 O production in A/O-SBR were analyzed. The results showed that NO accumulated in the anoxic phase under a fixed concentration of organic carbon source during denitrification with nitrite as electron acceptor or nitrate as electron acceptor. NO production in the aerobic phase could be related to hydroxylamine oxidation and nitrite reduction caused by high ammonia nitrogen. The accumulation of N2 O mainly occurred in the aerobic phase, and the cumulative concentration of N2 O at the end of the four typical cycles was above 4.02 mg/L. N2 O accumulation attributed to the inhibition of free nitrous acid (FNA) and NO, and electronic competition, which made N2 O reductase ( N2 OR ) activity insufficient, failing N2 O reduction.