Journal
BIORESOURCE TECHNOLOGY
Volume 360, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127409
Keywords
Filamentous bacteria; Pollutant removal; Low strength wastewater; Sphaerotilus; Toxicant degradation
Funding
- Shenzhen Science and Technology Innovation Commission [JCYJ20180306172051662, JCYJ20200109113006046, KCXFZ202002011006362, KCXFZ202012 21173413036]
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In low strength wastewater, aerobic granular sludge (AGS) with filamentous bacteria (FAGS) can be the result of wastewater selection. FAGS showed excellent ammonia nitrogen removal performance, large specific surface area, high extracellular polymeric substances (EPS) content, and strong stability.
In low strength wastewater, aerobic granular sludge (AGS) with filamentous bacteria is often found and regarded as unstable AGS. However, in this study, a new view is proposed that AGS with filamentous bacteria (FAGS) may be the result of low strength wastewater selection. FAGS was found when AGS was cultivated for 30 days. By increasing the settling time, FAGS could keep the mixed liquid suspension (MLSS) at 0.89 g/L. FAGS showed excellent ammonia nitrogen removal performance. The ammonia nitrogen oxidation rate and denitrification rate of FAGS were 1.72 and 1.20 times higher than that of AGS, respectively. FAGS have large specific surface area (15.99 m(2)/g), high extracellular polymeric substances (EPS) content (>200 mg/gVSS), and strong stability (integrity coefficient: 2 similar to 8%). Furthermore, FAGS showed higher potential than AGS in many aspects such as carbon metabolism, nitrogen metabolism, and toxicant degradation.
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