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• 基金项目：

• 李圭白
• 哈尔滨建筑工程学院

• 汤鸿霄
• 中国科学院环境化学研究所

• 摘要：目前,用水和废水处理中滤池反冲洗计算公式,通用的主要有两种类型,即:速比系数式和阻力系数式,本文评述了它们的发展、现状和存在向题。 根据理论推导和实验研究,本文提出改进的石英砂和无烟煤滤层反冲洗计算公式。石英砂滤层的速比系数式为:δ=6.4Re₀^-0.18.无烟煤滤层的速比系数式为:η=5.2Re^-0.75.两种滤层的阻力系数式则统一为:δ=7.2Re₀^-0.18这些改进式能够良好地符合不同来源的实验资料,用于计算可以得到比现在公式更加精确的结果。 实验是以我国常用滤料进行的,所得计算公式可以推荐取代借用的国外公式。

• Abstract：Currently, there are two types of equation for water and wastewater filter bed backwashing: the velocity ratio equation and the drag coefficient equation. Their development, status quo and some drawbacks are discussed here.By a way of theoretical deduction and experimental research, modified backwashing eduations are derived. Velocity ratio equation for sand filter bed is thus: δ=6.4Re₀^-0.18, while for coal filter bed: :δ=7.2Re₀^-0.18. Drag coefficient equation for both sand and coal filter beds are:η=5.2Re^-0.75.The equations so far derived are in good agreement, with the experimental data from different sources. They can be used as alternative method with better accuracy than the current equations.

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