活性滤料滤池气提系统影响因素研究

为了研究气量、水深和提砂管规格对活性滤料滤池提砂系统性能的影响,本实验以石英砂作为活性滤料滤池的提升介质,在恒定水头状态下,测量了不同管径下被提升的水和砂的体积和质量随压缩空气流量的变化.结果表明:随着气量的增大,提升系统的提砂量和提砂效率均呈先增大后减小的趋势;提砂管管径是最大提砂量的限制因素,但提升的砂水体积比与管径无关;相同气量条件下,单位空气提砂量与水深呈线性关系.因此,在活性滤料滤池提砂系统的设计应用过程中应选择合适的提砂管径,尽量增加浸水率,并注意控制气量以提升系统能效.

Influence factors in air-lift sand filter (ALF) system with bacteria activity

The performance of the air-lift filtration system in Nordic Water filters is particularly affected by air flow rate, water head and the size of sand-lifting tube. This paper tests the impacts of air flow rate and diameter of tube on the volume of the lifted water and sand at fixed water head in an air-lift sand filter (ALF). It is shown that the amount of lifted sand and lifting efficiency both have an increasing-then-decreasing trend with the increasing air flow. The diameter of sand-lifting tube mainly determines the maximum amount of lifted sand and the lifting efficiency, which has no effect on the ratio of lifted water to sand. There is also a linear relationship between water head and the amount of sand lifted per unit air flow volume under the condition of constant air flow. As a consequence, the diameter of the sand tube and air flow rate are suggested to be well designed in order to maximize the efficiency of the air-lift sand filter (ALF) system.