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Abstract
Partial nitrification (PN) of ammonia to nitrite is investigated in a lab-scale sequencing
batch reactor (SBR) coupled with both a microporous aeration system and a mechanical
agitation system at a moderate temperature of (27 ± 1 °C). The SBR has a high actual
oxygen transfer efficiency (AOTE) of 2.0% and dynamical efficiency (DE) of 20.0%.
Alkalinity consumption declined with the decreasing ratios of HCO3- to NH4+-N in the
influent from 2.57, 1.96, 1.91 to 1.66, while the pH of the effluent is constantly
maintained at 7.5 ± 0.1. The SBR is successfully operated for 195 days at a nitrogen
loading rate (NLR) of up to 2.82 kg·m-3.d-1, achieving a nitrite accumulation rate
(NAR) of over 90%. The high-throughput sequencing shows that the ratio of Nitrosomonas,
the dominant species, is up to 29.83%.