微灌砂滤料的表层过滤和气水反冲洗试验研究  

Surface Filtration and Air-Water Backwashing for Sandy Filter Media in Micro-irrigation

作　　者：张文正[1,2] 翟国亮[2] 邓忠[2,3] 刘杨[2] 陈震[1,2] 

机构地区：[1]中国农业科学院研究生院,北京100081 [2]中国农业科学院农田灌溉研究所,河南新乡453002 [3]西安理工大学水利水电学院,西安710048

出　　处：《灌溉排水学报》2013年第1期86-90,共5页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(50879089);农业科技成果转化资金项目(2011GB23320014)

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 par-tiele sizes, the relationship between the factors and surface filtration was determined by surface water pres- sure tested in the experiment. The effects of three filling patterns and single water backwashing were com- pared 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.

关 键 词：微灌 表层过滤 气水反冲洗 出水浊度 

分 类 号：S275.5[农业科学—农业水土工程]