The combination of external conditioning and Ca2+ addition prior to the reintroduction of effluent sludge into SBR sharply accelerates the formation of aerobic granules
作者： Jun Liu , Jun Li , Sarah Piché-Choquette
DOI: 10.1016/J.JWPE.2020.101269
关键词:
摘要: Abstract Aerobic granular sludge (AGS) technology has been limited by its long startup time in sequencing batch reactors (SBRs). The objective of this work is to determine if a new amendment the AGS process improves granulation rate and pollutants removal efficiency. This consisted an external conditioning step during which effluent was dried, supplemented with 0.1 g CaCl2 g−1 dried (DS) then gradually reintroduced into SBR. Results have shown that technique can reduce 17 days while ensuring stability AGS. Stable aerobic granules were obtained on day 20, i.e. few after reintroducing 1.75 g·L-1 Ca2+-conditioned SBR for 5 consecutive days. Mixed liquor suspended solids (MLSS), volume index ratio at 30 min (SVI30/SVI5) average granule size reactor maintained 5.7 g·L−1, 1.0 3.5 mm, respectively. led increase extracellular polymers (EPS) production, decrease moisture content, specific oxygen uptake (SOUR) iron precipitation. Altogether, these impacts faster aggregation compared control Furthermore, microbial community analyses enriched Betaproteobacteria (e.g. Thauera genus) aggregates Such outcomes could be linked more efficient degradation.
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