微灌砂滤料的表层过滤和气水反冲洗试验研究
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摘要
采用砂过滤器模型,在3种滤料粒径的条件下进行了过滤和气水反冲洗试验研究。根据在不同的过滤速度、原水颗粒质量分数、粉煤灰粒径条件下测得的滤层表面的压力,判断各因素与发生表层过滤的关系。以出水浊度随时间的变化,对比3种加气模式以及单纯水洗的效果。试验结果表明,原水颗粒质量分数和煤灰粒径是发生表层过滤的主要影响因素,且砂滤料的粒径越小,越容易发生表层过滤,在一定速度范围内过滤速度的影响最小。反冲洗以出水浊度为指标,气冲-气水混冲-水冲与气水混冲-水冲要优于气冲-水冲和单纯水洗的效果。
Using sandy filer model,the experiment of filtration and air-water backwashing were carried out under three different particle sizes.Under different filtration rates,raw water mass fractions and soot particle sizes,the relationship between the factors and surface filtration was determined by surface water pressure tested in the experiment.The effects of three filling patterns and single water backwashing were compared by the change of water turbidity following time.Results showed that raw water mass fraction and soot particle size were major factors leading to surface filtration.The smaller of sandy particle size,the more prone to surface filtration.Filtration rate was not a major factor under a certain speed range.Water turbidity was used as the indicator in the backwashing experiment,finding that air-air water-water and air water-water were superior to air-water and single water backwashing.
Using sandy filer model,the experiment of filtration and air-water backwashing were carried out under three different particle sizes.Under different filtration rates,raw water mass fractions and soot particle sizes,the relationship between the factors and surface filtration was determined by surface water pressure tested in the experiment.The effects of three filling patterns and single water backwashing were compared by the change of water turbidity following time.Results showed that raw water mass fraction and soot particle size were major factors leading to surface filtration.The smaller of sandy particle size,the more prone to surface filtration.Filtration rate was not a major factor under a certain speed range.Water turbidity was used as the indicator in the backwashing experiment,finding that air-air water-water and air water-water were superior to air-water and single water backwashing.
引文
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[2]翟国亮,陈刚,赵武,等.微灌用石英砂滤料的过滤与反冲洗试验[J].农业工程学报,2007,23(12):46-50.
[3]潘建仲,刘绪宗,于超英,等.均质滤床气水反冲洗工艺参数优选[J].中国给水排水,2002,(8):62-63.
[4]张建锋,张娟,王峰慧,等.V型滤池气水反冲洗过程滤料流失影响因素分析[J].给水排水,2009,(10):25-27.
[5]王磊波,杨四宝,高学治.滤池气水反冲洗过程中气与水强度关系的确定[J].供水技术,2010,4(2):15-18.
[6]曹勇锋,张朝升.V型滤池滤砂优选和反冲洗参数确定[J].广州大学学报(自然科学版),2008,7(4):64-67.