细小泥沙对半透膜微润管堵塞的影响

Influences of tiny sediment particles on clogging performance of moistube

为探明半透膜微润管对细小泥沙抗堵塞性能的影响,采用有压连续灌水方式对微润管3种粒径组成小于0.100 0 mm的泥沙颗粒进行了不同质量分数浑水灌溉堵塞试验.分析了泥沙粒径、含沙量以及压力水头对灌水器堵塞的影响,同时探讨了灌水器发生堵塞时的敏感粒径范围和含沙量质量分数值.试验结果表明:随着浑水含沙量的增大堵塞越严重,呈正相关关系;粒径在0.061 0~0.100 0 mm对微润管的堵塞影响最大;相同水质条件下,随着压力水头的增大微润管堵塞程度会降低.研究结果为进一步利用半透膜微润灌溉技术提供了相关的理论基础.

A series of muddy water clogging experiments are carried out under three particle sizes( < 0. 100 0 mm) and different sediment concentrations when a mositub is subject to continuous irrigation to investigate influences of tiny sediment particles in water on clogging performance of moistube.Based on the experimental results,the effects of particle size,concentration and pressure head on the clogging performance are analysed. Meanwhile,the sensitive range of particle size and levels of sediment concentration for clogging are discussed. It is turned out that there is a positive relationship between sediment concentration and clogging degree. Moreover,the moistube is prone to being clogged when particle size is between 0. 061 0 and 0. 100 0 mm. Under the same water quality condition,the clogging degree reduces with increasing pressure head. These findings can provide a relevant theoretical basis for better utilizing moistube irrigation technology.