期刊
BIORESOURCE TECHNOLOGY
卷 198, 期 -, 页码 358-363出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.08.155
关键词
Aerobic granular sludge; Flocs-GAC coaggregation; Hydraulic analysis; Granular activated carbon (GAC); Nucleating agent
资金
- National Natural Science Foundation of China [51478416]
- National Key Technologies Research and Development Program of China [2013BAC16B04]
- Public Projects of Zhejiang Province [2014C33017]
- Natural Science Foundation of Zhejiang Province [LY13E080003]
- Fundamental Research Funds for the Central Universities
Initial cell aggregation plays an important role in the formation of aerobic granules. In this study, three parallel aerobic granular sludge reactors treating low-strength wastewater were established using granular activated carbon (GAC) of different sizes as the nucleating agent. A novel visual quantitative evaluation method was used to discern how GAC size affects velocity field differences (GAC versus flocs) and aggregation behavior during sludge granulation. Results showed that sludge granulation was significantly enhanced by addition of 0.2 mm GAC. However, there was no obvious improvement in granulation in reactor amended with 0.6 mm GAC. Hydraulic analysis revealed that increase of GAC size enhanced the velocity field difference between flocs and GAC, which decreased the lifecycle and fraction of flocs-GAC aggregates. Overall, based on analysis of aggregation behavior, GAC of suitable sizes (0.2 mm) can serve as the nucleating agent to accelerate flocs-GAC coaggregation and formation of aerobic granules. (C) 2015 Elsevier Ltd. All rights reserved.
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