• 关键词：过滤  截污能力  毛细管模型  孔隙率

• 基金项目：九·五攻关项目(No.969090302);国家自然科学基金(29977027,50178009)

• 郭瑾珑
• 中国科学院生态环境研究中心环境水化学国家重点实验室,北京 100085

• 王毅力
• 北京林业大学资源与环境学院

• 刘瑞霞
• 中国科学院生态环境研究中心环境水化学国家重点实验室,北京 100085

• 汤鸿霄
• 中国科学院生态环境研究中心环境水化学国家重点实验室,北京 100085

• 摘要：对均质滤料过滤进行了分析,采用毛细管模型研究过滤水流,给出毛细管中剪切应力的分布,通过毛细管中颗粒物的受力分析,求得颗粒与毛细管壁间的物理化学作用力.对颗粒在毛细管中运动的受力平衡进行分析简化,得到了截污饱和时滤床中孔隙率的计算公式,由此可以计算出均质滤床的最大截污能力,即:清洁滤床的孔隙率与饱和孔隙率之差乘以滤床的体积.

• Abstract：Through analyzing the uniform media filtration, the capillary model was used to determine the flow pattern in the packed bed, and then the fluid shear force distribution in the capillary was presented. The physical-chemical forces between a particle and the capillary wall were calculated by analytical equations. By equilibrium analysis of the forces acting on a particle adhered on the capillary wall and appropriate simplification, the analytical equation of the porosity in the saturated filter bed was obtained, from which the maximum entrapment capacity during the filtration process was achieved. Moreover, the filtration capacity under certain operations were also presented and discussed.

• Key words：filtration  entrapment capacity  capillary model  porosity

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