WANGJia-xuan,LIZheng-yang,LIUZhe,et al.Rapid Formation and Performance of Aerobic Granular Sludge for Efficient Quinoline Degradation[J].China Water & Wastewater,2022,38(9):8-17.
Rapid Formation and Performance of Aerobic Granular Sludge for Efficient Quinoline Degradation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第9期
Page:
8-17
Column:
Date of publication:
2022-05-01
- Keywords:
- aerobic granular sludge (AGS); sequencing batch reactor (SBR); quinoline; extracellular polymeric substances (EPS); microbial community
- Abstract:
- In sequencing batch reactor (SBR), activated sludge was used to rapidly cultivate aerobic granular sludge (AGS) with high efficiency for degrading quinoline after 34 days， with an average particle size of 0.83 mm, mixed liquor suspended solids (MLSS) of 3.25 g/L, and sludge volume index (SVI30) of 36.92 mL/g. For the mature AGS, the removal rate of quinoline was 91.18%, and it had excellent performance of simultaneous nitrogen and phosphorus removal. During the domestication of AGS, the first addition of 20 mg/L quinoline would cause the deterioration of effluent quality and sludge performance in a short period. Nevertheless, as the sludge adapted to quinoline, these indicators were recovered. When the concentration of quinoline was increased to 40 mg/L, the removal efficiency decreased in a short time, but sludge showed good resistance and with the deepening of granulation, the removal of quinoline was further improved. Additionally, quinoline stimulated sludge microorganisms to secrete a large amount of TB-EPS, mainly protein (PN), thus forming a protective barrier against external stress. High-throughput sequencing results showed that Thauera, Zoogloea and other functional bacteria with the ability for denitrifying and EPS secreting were highly abundant in mature AGS. Moreover, the efficient quinoline-degrading bacteria groups such as Acidovorax and Paracoccus were enriched, thus forming a more stable ecological niche.
Last Update:
2022-05-01