Reducing nitrous oxide emission in a sequencing batch reactor operated as static/aerobic/anoxic (SOA) process
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Updated: Jan 21, 2026

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Published on: September 6, 2018
Long Zeng1, Hongbo Chen1, Lin Liu1
1College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
Abstract:
The static/aerobic/anoxic (SOA) activated sludge process was implemented to investigate the nitrous oxide (N2O) emission characteristics with the conventional anaerobic/anoxic/oxic (A2/O) process as a control group. Although the SOA process can achieve substantial biological nutrient removal (BNR), its N2O emission was increased compared with the traditional A2/O process. The improvement of the SOA process was carried out by shortening the static time from 60 min to 15 min. SOA with 30-min static time had an advantage over that with 60-min static time in N2O mitigation with emission factors decreasing from 7.32% to 3.69% of total nitrogen removed and proved more effective in phosphorus removal than the 15-min static time process. 30-min static time induced more eternal carbon sources consumed in the inception of the aerobic phase, which induced less N2O generation in the SOA process. The results demonstrated that the modified SOA could be an alternative process for BNR and N2O mitigation.
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