摘要
研究以再生水(二级处理出水)为灌溉水源时,3种滴头(单翼迷宫式滴头、内镶式滴头和压力补偿孔口式滴头)的流量、灌水均匀度和堵塞的变化过程及规律,并和自来水灌溉条件下的结果进行对比,分析了滴头堵塞的主要原因。研究结果显示:再生水灌溉条件下3种滴头的流量和灌水均匀度都要明显小于自来水条件下的结果,其中单翼迷宫式滴头的流量和灌水均匀度下降最大,而压力补偿孔口式滴头的变化最小。水质和滴头内沉淀物质的分析显示,化学沉淀(主要成分为CaCO3和MgCO3)是引起滴头堵塞的主要方式,滴头流量小、流道尺寸小和流态指数偏高也增加了滴头堵塞的风险。建议实际中利用再生水灌溉的滴灌系统,可选用压力补偿孔口式滴头。
A laboratory experiment was conducted to investigate the mean discharge,distribution uniformity coefficient and clogging pattern of the single wing labyrinth emitter,the integral labyrinth emitter and the pressure-compensation emitter with the application of tape water and reclaimed water.Main reasons of emitter clogging were analyzed.Results indicated that the mean discharge and Christiansen uniformity coefficient of the three types of emitters were obviously lower for reclaimed water in comparison with those for tap water. The reduction percentages of the mean discharge and distribution uniformity coefficient were the greatest for the single wing labyrinth emitter, while the least were for the pressure-compensation emitter. Chemical precipitation （main parts： CaCO3 and MgCO3） was the main reason for emitter clogging, which was partially due to higher ions concentration and pH value for the reclaimed water in comparison with the tap water. Emitters with low discharge, small flow-path dimension and higher emitter discharge exponent were also subject to clogging. The pressure-compensation emitter is recommended for drip irrigation system with the application of reclaimed water.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第9期15-20,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(50639040
50509025)
北京市科技计划项目(D07050601510000)
关键词
灌溉
污水回用
水力学
再生水
滴灌
滴头堵塞
滴头流量
均匀度
irrigation
wastewater reclamation
hydraulic
reclaimed water
drip irrigation
emitter clogging
emitter discharge
uniformity
