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Bioresource Technology
Vol. 220, 2016, Pages: 225–232

Performance of a full-scale modified anaerobic/anoxic/oxic process: High-throughput sequence analysis of its microbial structures and their community functions

Yasong Chen, Zheng Zhao, Yuke Peng, Jie Li, Lin Xiao, Liuyan Yang

School of the Environment, Nanjing University, State Key Laboratory for Pollution Control and Resource Reuse (SKL-PCRR), Nanjing University Xianlin Campus, Xianlin Avenue 163, Nanjing 210023, China.

Abstract

The average COD, TN, TP, and NH4+-N elimination rates in a new wastewater treatment plant (WWTP) based on a modified A2/O process were 83%, 72.4%, 93.5%, and 98.6%, respectively, even under conditions of a low C/N ratio and low temperature. Among the four potential denitrifying units, the post-anoxic unit was the least efficient with respect to the removal efficiency. However, the structures of the bacterial community among samples obtained from the treatment units were similar, as demonstrated using Illumina Miseq high-throughput sequencing. Genera with nitrifying, denitrifying, hydrolyzing, and glycogen-accumulating activities were identified in all units, indicating that functional groups were highly enriched in the active sludges and thus enabled nitrogen removal. The key functional microorganisms responsible for nitrification-denitrification in the WWTP were species belonging to the genera NitrospiraHydrogenophilaceaeComamonasDechloromonasThaueraHaliangium, and Halomonas.

Keywords: WWTP; Microbial community; Denitrification; High-throughput sequencing; Modified A2/O.

 
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