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首页> 外文会议>International Water Association(IWA) Conference; 20050518-20; Xi'an(CN) >Study of cake layer morphology in microfilt ration of activated sludge wastewater treatment by fractal theory
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Study of cake layer morphology in microfilt ration of activated sludge wastewater treatment by fractal theory

机译：分形理论研究活性污泥微滤中滤饼层的形貌

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摘要

The microfiltration of activated sludge wastewater is a very complex process, in which membrane fouling is crucial problem should to be resolved. Cake layer formation can be the dominant membrane fouling mechanisms. Microstructure of cake layer, including volume fraction of the pores, relative location of the pores, geometrical structure of the pores, has not been explored until now, which is a key factor determining membrane permeate flux. In this paper, fractal theory was used to gain knowledge of cake microstructure and its correlation to cake properties. Scanning electron microscope (SEM) and image analyzer were utilized to estimate pore shape and pore area distributions. Two different fractal dimension model, pore area distribution fractal dimension (D_s) pore boundary fractal dimension (D_b), were introduced to illuminate the relationship of cake layer morphology and its permeation. The results indicate that the cake layer had good fractal characteristics, the pore area distribution fractal dimension and the pore boundary fractal dimension were available parameters to estimate cake layer permeability and cake layer microstructure.
机译：活性污泥废水的微滤是一个非常复杂的过程，其中膜污染是关键问题，必须解决。滤饼层的形成可能是主要的膜污染机制。滤饼层的微观结构，包括孔的体积分数，孔的相对位置，孔的几何结构，至今尚未得到探索，这是决定膜渗透通量的关键因素。在本文中，分形理论被用来了解蛋糕的微观结构及其与蛋糕性能的关系。利用扫描电子显微镜（SEM）和图像分析仪估计孔的形状和孔面积分布。介绍了两种不同的分形维数模型，即孔隙面积分布分形维数（D_s），孔边界分形维数（D_b），以阐明滤饼层形态与其渗透性之间的关系。结果表明，滤饼层具有良好的分形特征，孔面积分布分形维数和孔边界分形维数是评价滤饼层渗透性和滤饼层微观结构的有效参数。

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