WUYuan-yuan,Mark van Loosdrecht,HAOXiao-di,et al.A Pilot Study on Stability of Aerobic Granular Sludge at Low Temperature[J].China Water & Wastewater,2022,38(11):56-61.
A Pilot Study on Stability of Aerobic Granular Sludge at Low Temperature
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第11期
Page:
56-61
Column:
Date of publication:
2022-06-01
- Keywords:
- aerobic granular sludge (AGS); low-carbon source sewage; granulation; low temperature; nutrient removal
- Abstract:
- Aerobic granular sludge (AGS) is widely considered as a sustainable technology for wastewater treatment due to the great advantages over conventional activated sludge: low footprint, low energy consumption, low disposed sludge and high tolerance to the fluctuations etc. A pilot reactor (effective volume of 2.5 m3) was operated for 260 days to cultivate the AGS with actual municipal wastewater and investigate the influence of low temperature on the stability of AGS. The reactor was started in summer，and finally a high granulation rate of 94% was realized with a low SVI5/SVI30 of 1.1-1.3, which indicated a mature granular system. However, granulation rate slightly decreased to 80%-91% with SVI5/SVI30 increasing to 1.5-1.8 while Zoogloea ramigera, filamentous grew at low temperature condition. Under low temperature conditions in winter, nitrogen removal efficiency was improved by adjusting influent flow rate, aeration duration and DO concentration. The effluent COD、TP、NH4+-N and TN could meet the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) during the whole experiments, however the TN removal efficiency slightly decreased (almost 6%-9%) which indicated a risk of exceeding the standard.
Last Update:
2022-06-01