Feasibility of Adjusting the S 2 O 3 2? /NO 3 ? Ratio to Adapt to Dynamic Influents in Coupled Anammox and Denitrification Systems

Yuqian Hou, Shaoju Cheng, Mengliang Wang, Chenyong Zhang and Bo Liu
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Yuqian Hou: State Key Laboratory of Pollution Control and Resource Reuse Research, School of the Environment, Nanjing University, Nanjing 210046, China
Shaoju Cheng: State Key Laboratory of Pollution Control and Resource Reuse Research, School of the Environment, Nanjing University, Nanjing 210046, China
Mengliang Wang: State Key Laboratory of Pollution Control and Resource Reuse Research, School of the Environment, Nanjing University, Nanjing 210046, China
Chenyong Zhang: State Key Laboratory of Pollution Control and Resource Reuse Research, School of the Environment, Nanjing University, Nanjing 210046, China
Bo Liu: State Key Laboratory of Pollution Control and Resource Reuse Research, School of the Environment, Nanjing University, Nanjing 210046, China

IJERPH, 2020, vol. 17, issue 7, 1-15

Abstract: In this study, anammox, sulfur-based autotrophic denitrification, and heterotrophic denitrification (A/SAD/HD) were coupled in an expanded granular sludge bed (EGSB) reactor to explore the feasibility of enhancing denitrification performance by adjusting the S 2 O 3 2−/ NO 3 − (S/N) ratio to accommodate dynamic influents. The results indicated that the optimal influent conditions occurred when the conversion efficiency of ammonium (CEA) was 55%, the S/N ratio was 1.24, and the chemical oxygen demand (COD) was 50 mg/L, which resulted in a total nitrogen removal efficiency (NRE) of 95.0% ± 0.5%. The S/N ratio regulation strategy was feasible when the influent COD concentration was less than 100 mg/L and the CEA was between 57% and 63%. Characterization by 16S rRNA sequencing showed that Candidatus Jettenia might have contributed the most to anammox, while Thiobacillus and Denitratisoma were the dominant taxa related to denitrification. The findings of this study provide insights into the effects of CEA and COD on the performance of the A/SAD/HD system and the feasibility of the S/N ratio regulation strategy.

Keywords: Anammox; coupled denitrification; S/N ratio regulation strategy; total nitrogen removal; competition and cooperation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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