造粒
胞外聚合物
化学
活性污泥
废水
化学工程
颗粒(地质)
成核
制浆造纸工业
色谱法
材料科学
环境工程
复合材料
生物膜
环境科学
细菌
有机化学
生物
遗传学
工程类
作者
Jiaheng Zhou,Hang Zhao,Miao Hu,Huifang Yu,Xiangyang Xu,Julia E. Vidonish,Pedro J. J. Alvarez,Liang Zhu
标识
DOI:10.1016/j.biortech.2015.08.155
摘要
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.
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