摘要
为了揭示水肥一体化灌溉过程中肥沙对微孔陶瓷灌水器堵塞的影响和机理,研究了肥沙(质量浓度为3%的尿素和浓度为2 g/L的泥沙)和肥水(质量浓度为3%的尿素)对微孔陶瓷灌水器堵塞的影响,并利用XRD分析灌水器内沉积物的成分。结果表明:以平均相对流量的75%作为堵塞的评判标准,肥沙耦合条件下,在灌溉200 h以后,微孔陶瓷灌水器会发生严重堵塞。肥水灌溉条件下不会发生严重堵塞,泥沙颗粒会在微孔陶瓷灌水器内壁逐渐形成一层泥沙膜,泥沙膜的主要成分为SiO_2、碳酸钙和硅酸钙,在灌溉过程中逐渐沉积在微孔陶瓷灌水器的内壁,并不会进入微孔陶瓷灌水器的微孔中。泥沙膜的形成是引起微孔陶瓷灌水器发生堵塞的主要原因。
The effect of fertilizer sand(quality of 3% urea and sediment of 2g/L) and fertilizer water(quality of 3% urea) on the blocking of microporous ceramic irrigation emitters are studied in order to reveal the mechanism and influence of sand-fertilizer on microporous ceramic irrigation emitters in the process of integrated water and fertilizer irrigation.The composition of the sediment in the emitter is analyzed by XRD.When 75% of the average relative flow rate is used as the criterion for clogging,the results show that:under the condition of fertilizer-sand coupling irrigation,after irrigation for 200 h,the micro porous ceramic irrigation emitters will be seriously blocked,but under the fertilizer and water irrigation condition,the blockage is not serious.During the fertilizer-sand irrigation,the sediment particles will gradually form a sediment film on the inner wall of the micro porous ceramic irrigation emitter and will not enter the micropores of the micro porous ceramic irrigation emitter.The main components of the sediment film are SiO2,calcium carbonate and calcium silicate.The formation of the sediment film is the main cause of blockage of the micro porous ceramic irrigation emitter.
作者
董爱红
蔡耀辉
赵笑
陈玺
张林
DONG Ai-hong;CAI Yao-hui;ZHAO Xiao;CHEN Xi;ZHANG Lin(College of Water Resources and Architectural Engineering of China, Northwest A&F University,Yangling 712100,Shaanxi Province,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi Province,China)
出处
《节水灌溉》
北大核心
2019年第1期32-35,39,共5页
Water Saving Irrigation
基金
陕西省重点研发计划项目(2017NY-118)
杨凌示范区科技计划项目(2017NY-28)
宁夏回族自治区重点研发计划项目(2018BBF02006)
陕西省科技统筹创新工程计划项目(2016KTZDNY-01-03)
关键词
微孔陶瓷灌水器
堵塞
肥水
肥沙
流量
micro porous ceramic emitter
clogging
fertilizer
fertilizer-sand
flow rate
