Reducing nitrous oxide emission in a sequencing batch reactor operated as static/aerobic/anoxic (SOA) process

Long Zeng; Hongbo Chen; Lin Liu; Qiongzhi Zhou; Dongbo Wang

doi:10.1016/j.scitotenv.2019.133619

Reducing nitrous oxide emission in a sequencing batch reactor operated as static/aerobic/anoxic (SOA) process

Sci Total Environ. 2019 Nov 25:693:133619. doi: 10.1016/j.scitotenv.2019.133619. Epub 2019 Jul 26.

Authors

Long Zeng¹, Hongbo Chen², Lin Liu¹, Qiongzhi Zhou¹, Dongbo Wang³

Affiliations

¹ College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
² College of Environment and Resources, Xiangtan University, Xiangtan 411105, China. Electronic address: chenhongbo@hnu.edu.cn.
³ College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.

PMID: 31376759
DOI: 10.1016/j.scitotenv.2019.133619

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.

Keywords: BNR; Nitrous oxide; SOA; Static time.

MeSH terms

Bioreactors*
Nitrous Oxide / analysis*
Waste Disposal, Fluid / methods*

Substances

Nitrous Oxide