The static/aerobic/anoxic (SOA) activated sludge process was implemented to investigate the nitrous oxide (NO) emission characteristics with the conventional anaerobic/anoxic/oxic (A/O) process as a control group. Although the SOA process can achieve substantial biological nutrient removal (BNR), its NO emission was increased compared with the traditional A/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 NO 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 NO generation in the SOA process. The results demonstrated that the modified SOA could be an alternative process for BNR and NO mitigation.
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| http://dx.doi.org/10.1016/j.scitotenv.2019.133619 | DOI Listing |
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