Performance of short-cut denitrifying phosphorus removal and microbial community structure in the A 2 SBR process

• Published in: Environmental technology p. 1
• Main Authors: Li, Wei, Hou, Yunhe, Ye, Youlin, Bin, Ye, Gao, Yunan, Dong, Zijun
• Format: Journal Article
• Language: English
• Published: England 05.06.2023
• Subjects: microbial community; SDPAOs; metabolic mechanism; A2SBR; low C/N sewage
• ISSN: 1479-487X

Acclimatization of short-cut denitrifying polyphosphate accumulating organisms (SDPAOs), metabolic mechanism, and operating parameters were analyzed to investigate the performance of the anaerobic/anoxic sequencing batch reactor (A SBR) process. The high-throughput sequencing technology was employed to explore the microbial community structures of activated sludge systems. The experimental results illustrated that SDPAOs were successfully enriched with three-phase inoculation for 36 days. The removal rates of TP and NO -N were 93.22% and 91.36%, respectively, under the optimal parameters of a pH of 7.5, an SRT of 26 days, a temperature of 24 ℃ and a COD of 200.00 mg·L using acetate as the carbon source. In the anaerobic stage, 82.20% external carbon source was converted into 88.78 mg·g PHB, and the removal rate of NO -N in the anoxic stage was characterized by ΔNO -N/ΔPHB, anoxic ΔP/ΔPHB was 0.289, which was higher than anaerobic ΔP/ΔCOD of 0.203. and with significant phosphorus removal ability were the dominant bacterial genera. The nitrogen and phosphorus removal could be realized simultaneously in an anaerobic/anoxic sequencing batch reactor. Therefore, this study provided an important understanding of the removal of nitrogen and phosphorus from low-carbon nitrogen wastewater.