Insight into how high dissolved oxygen favors the startup of nitritation with aerobic granules
نویسندگان
چکیده
To elucidate how high dissolved oxygen (DO) favors the startup of nitritation with aerobic granular sludge, two reactors were operated under low (1–2 mg O2·L−1) and DO (3–5 conditions similar effluent ammonium concentrations (>20 N·L−1). The results showed that though an average nitrite accumulation ratio above 95% was finally achieved in both reactors, a five-fold start-up time (eleven weeks) required for reactor compared to reactor. Moreover, performance positively correlated extent nitrifiers stratification granules. faster mainly resulted from formation well-stratified nitrifiers, oxidizing bacteria (AOB) dominating granule surface. High operation combined sufficient supply ensured growth AOB, which should provide competitive advantage AOB competing habitable space (i.e., surface). Besides, lower porosity, larger size, more active extracellular polymeric substances (particularly proteins) production granules observed condition. Overall, these findings supported proposition switch mixed stratified distribution primarily driven by their competition rather than oxygen-limitation.
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ژورنال
عنوان ژورنال: Chemosphere
سال: 2021
ISSN: ['0045-6535', '1879-1298']
DOI: https://doi.org/10.1016/j.chemosphere.2020.128643