快滤池反冲洗方式试验研究

快滤池反冲洗方式试验研究

摘要：对比气水反冲洗的三种方式进行试验分析，可以看出：方式三（即先单独空气冲洗，再气水同时反冲洗，最后单独水冲洗）的冲洗效果最好，在第15分钟初滤水即降至0.3NTU以下，并且其过滤周期也明显大于另三种方式。其它三种方式初滤水达到要求的时间是在20～30分钟内，并且在过滤运行中发现水头损失较大，过滤周期较短等问题。由试验分析，确定冲洗最佳冲洗参数为：气冲洗强度为15 L/s·m2，时间为2min；气水同时冲洗的气冲强度为15 L/s·m2，水冲强度为8L/s·m2，时间为4min，单独水冲洗强度为8 L/s·m2，时间为4min。

关键词：普通快滤池；气水反冲洗；

Study on the mode of filter backwash

Liu Yanyan1，Fan Shen2

(1．Tianjin Public Utility Design&Research Institute，Tianjin 300100，China；

2．China TianChen Engineering Corporation,，Tianjin 300400)

Abstract：Through comparison of three ways of air-water backwash, we can see: the effect of the third way( firstly is single air backwash, then is air water backwash, finally is water backwash) is the best, which can make the filter water less than 0.3NTU in the initial fifteenth minutes, thus the filtration cycle is longer than the other three methods, as which are in in 20 ~30 minutes to meet the requirements with higher loss of water-head in filtering operation and shorter filtration cycle. By the test analysis, it determines the best flushing parameters: the strength of air flushing is 15 L/s·m2, time is 2min; the strength of air flushing is 15 L/s·m2, water backwash is 8 L/s·m2in air-water backwash, time is 4min; the strength of water flushing is 8 L/s·m2, time is 4min.

Key words: ordinary rapid filter; air-water backwash

普通快滤池在净水工艺中是一种适应广泛、性能稳定、容易操作管理的过滤构筑物，但是要想使它性能稳定、处理水质好、效率高，关键的一个环节就是反冲洗。只有反冲洗彻底，才能保证快滤池的正常运行。滤池冲洗方式通常有水反冲洗及气水反冲洗两种。

1试验材料和方法

1.1试验装置

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