微灌石英砂颗粒表面滞纳能力计算与分析

Calculation and Analysis of Surface Retention Capacity of Quartz Sand in Micro-irrigation

微灌砂颗粒的滞纳能力,直接影响到砂滤层过滤性能,从而对滤层过滤效果产生重要影响,分析石英砂颗粒表面对过滤水中杂质颗粒的滞纳能力十分重要。选取3种微灌石英砂滤料的砂颗粒(粒径范围为1.00~1.18、1.18~1.40和1.40~1.70 mm)作为样本,采用三维表面形貌仪对砂颗粒表面轮廓最大高度和与轮廓最大高度对应的波纹宽度进行测量。对砂颗粒滞纳水中杂质颗粒的机理进行分析,建立了砂颗粒表面轮廓的几何模型和砂颗粒表面杂质颗粒受力的数学模型,并计算了砂颗粒对水中杂质颗粒的滞纳能力。适当增加砂滤料的粒径,可以提高砂滤层过滤性能的稳定性。

The retention capacity of sand particles in micro irrigation has a direct impact on the filtration performance of the sand filter,and thus has an important impact on the filtration effect of the filter.So it is very important to analyze the ability of the surface of quartz sand particles to hold the impurities in the filtered water.In this paper,three kinds of quartz sand filter layer with the diameter range 1.00~1.18,1.18~1.40 and 1.40~1.70 mm,respectively,were selected as samples.And the corrugation width corresponding to the maximum height of the surface profile and the maximum height of the profile was measured by the three-dimensional surface topography instrument.On this basis,the mechanism of the sand particles holding the impurities in the filtered water was analyzed and calculated.The results show that properly increasing the particle size of sand filter material can improve the stability of filtration performance of sand filter.