在各类重力式过滤池中如何防止在滤层中出现负压以免发生气阻现象,是滤池设计和运营管理中的一个重要问题。“关于当前过滤技术发展中几个问题的分析”(发表在本刊1983年第5期)一文中对移动罩滤池的设计提出了许多有益的观点。但文中有些论点还值得商榷,现特提出,共同讨论。该文中指出滤层中某点的压力可按下式计算 It is an important issue in the design and operation management of filter tanks how to prevent negative pressure from occurring in the filter layer in various types of gravity filter tanks to avoid gas resistance. “Analysis of Several Issues in the Development of Current Filtration Technology” (published in the 5th issue of the Journal of the People’s Republic of China in 1983) provides a number of useful ideas for the design of the mobile cap filter. However, some of the arguments in the article are still open to question. They are now proposed and discussed together. The article points out that the pressure in a certain point in the filter layer can be calculated as follows