| 活性污泥絮体的分形结构分析 |
| 摘要点击 2738 全文点击 1444 投稿时间：2012-06-02 修订日期：2012-07-19 |
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| 中文关键词 活性污泥 分形结构 小角光散射 Gamma分布 絮团-絮团凝聚 |
| 英文关键词 activated sludge fractal structure small-angle light scattering gamma distribution cluster-cluster aggregation |
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| 中文摘要 |
| 通过小角光散射(small-angle light scattering, SALS)实验确定出活性污泥絮体的分形区域,对絮体粒径分布进行了拟合分析,采用原子力显微镜(AFM)和激光共聚焦扫描显微镜(CLSM)对絮体在不同尺度下的形貌进行了观测. 结果显示,污泥絮体是由一系列的絮团结合而成,絮体表面凹凸不平,有各种"孔洞","缝隙",絮体内部存在一系列的孔隙. 较大尺度的絮体同时存在多种孔道结构,构成絮体中营养物和水流的运输通道; 污泥絮体在0.5~50 μm之间具有明显的分形结构,表明活性污泥絮体在较小的粒径时已经具有一定的分形特征,活性污泥的粒度分布属于Gamma分布方式,证明污泥絮体的成长过程是一种絮团-絮团的凝聚过程. |
| 英文摘要 |
| The small-angle light scattering (SALS) experiment was executed to calculate the fractal region, and the data of particle size distribution was fitted by Gamma equation. Besides, the atomic force microscope (AFM) and confocal laser scanning microscopy (CLSM) were used to observe the morphology of the microstructure of the sludge flocs under different scales. The results showed that the sluge floc was constituted by a series of clusters with different sizes. The surface of the floc was unsmooth with various "holes" and "gaps" and there were a range of pore structures within the sludge floc. For sludge flocs at large scales, a variety of pore texture coexisted, forming a transport channel for the nutrients and water in the sludge. The results also showed that the fractal structure was present in sludge flocs in the size range of 0.5-50 μm and the particle size distribution was fitted to the Gamma equation distribution model, indicating that the sludge floc formation process is a process dominated by Cluster-Cluster flocculation. |
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