Effect of C/N/S on nitrate reduction process in activated sludge system
ZHANG Peng-cheng1, LI Xiao-ling1,2, WANG Xiao-ting1, ZHANG Yu-hao3, ZHANG Jia-ying1, LIU Xin-yi1, ZHANG Wen-bo1
1. School of Civil Engineering, Chang'an University, Xi'an 710061, China; 2. Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-Rural Development, School of Civil Engineering, Chang'an University, Xi'an 710054, China; 3. Xi'an Zhongjiao Environmental Engineering Co., Ltd., Xi'an 710054, China
Abstract:The effect of different electron donors (organics or S2-) on denitrification and nitrate nitrogen reduction to ammonium (DNRA) was explored by adjusting inlet C/N and S/N ratios in an activated sequencing batch reactor (ASBR). The results showed that higher C/N ratios improved denitrification process, while higher S/N ratios were more beneficial to DNRA process. NH4+-N, the characteristic product of DNRA, greatly yielded when C/N/S were 2:2:3 and 2:2:4, with the highest effluent NH4+-N concentration of 10.65mg/L at C/N/S of 2:2:4. It indicated that when the electron acceptor was limited, the excess electron donor could increase the activity of DNRA and promote the conversion of denitrification to the DNRA process. 16SrRNA microbiological analysis clarified that Proteobacteria, Anaerolineae, Bacteroidia as well as Actinobacteria were closely related with nitrate reduction process, and Actinobacteria was corelated with the DNRA. Overall, this study provided alternative strategies for the simultaneous removal of carbon, nitrogen, and sulfur in the sewage treatment process.
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