Granular activated carbon as nucleating agent for aerobic sludge granulation: Effect of GAC size on velocity field differences (GAC versus flocs) and aggregation behavior
Granular activated carbon as nucleating agent for aerobic sludge granulation: Effect of GAC size on velocity field differences (GAC versus flocs) and aggregation behavior
复制标题
颗粒活性炭作为好氧污泥颗粒化成核剂：GAC 尺寸对速度场差异（GAC 与絮凝体）和聚集行为的影响
DOI：
10.1016/j.biortech.2015.08.155
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发表时间：
2015
影响因子：
11.4
通讯作者：
Zhu Liang
中科院分区：
文献类型：
--
作者：
Zhou Jia-heng;Zhao Hang;Hu Miao;Yu Hai-tian;Xu Xiang-yang;Vidonish Julia;Alvarez P.J.J;Zhu Liang
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.
