摘要
【目的】探究水磁化处理对富含黏性颗粒水肥溶液絮凝沉降过程的影响。【方法】配置5种质量浓度的高岭土悬浮液(0.5、1.0、1.5、3.0、5.0 g/L)和3种质量浓度(0.25、0.5 g/L和0.75 g/L)的硫酸钾、尿素、复合肥混合液共14种,分别在4种不同磁化强度(W0:0 T、W1:0.2 T、W2:0.4 T和W3:0.6 T)下,测定4 h内沉降量筒底端10cm高处的浊度、中值沉速、沉降泥沙机械组成、水样zeta电位、p H值、电导率和黏滞系数等的变化。【结果】与未磁化处理相比,磁化后黏性颗粒的絮凝作用有所增强、沉降速率加快(p<0.01);磁化强度为0.4 T(W2)时,黏性颗粒的絮凝作用最强,沉降泥沙的中值粒径比未磁化处理最高可增加14.7%,其黏粒占比最高可减少25.0%,zeta电位最高可降低68.7%。当水中加入不同肥料时,磁化对沉降泥沙中值粒径、黏粒占比和水样zeta电位值的影响不同,施加硫酸钾肥时磁化的影响效果最大,施加尿素时的影响效果最小。【结论】灌溉水磁化处理可显著促进黏性颗粒的絮凝作用和沉降速率,建议用磁化水灌溉或者输水时,应定期冲洗管网系统,排除管网中的沉降泥沙。
【Objective】Sedimentation and particle clogging is a phenomenon often occurring in irrigation pipe networks. The purpose of this paper is to investigate the feasibility and efficacy of magnetization on enhancing particle flocculation so as to alleviate sedimentation.【Method】We used suspension of kaolin clay at concentration of 0.5, 1, 1.5, 3 and 5 g/L as the testing particles, and mixed them with potassium sulfate at concentration of 0.25 g/L,urea at 0.5 g/L and compounded fertilizer at 0.75 g/L. Each solution was magnetized at strength at 0.2 T(W1), 0.4 T(W2) and 0.6 T(W3), respectively, with non-magnetization taken as the control(CK). We then let the suspension to settle in a cylinder, during which we measured the turbidity and median sedimentation velocity at the height of 10cm, as well as the change in sedimentation composition, zeta potential, pH, conductivity and viscosity of the sample.【Result】Compared with CK, magnetization enhanced flocculation of the kaolin particles and increased its sedimentation as a result(p<0.01). When the magnetization intensity was 0.4 T, the flocculation of the particles peaked and it associated sedimentation maximized. Compared with CK, magnetization also increased the median particle size by 14.7%, reduced the proportion of clay particles by 25.0% and the zeta potential by 68.7%. The efficacy of magnetization on the median size of the sediments, proportion of the clay particles and the zeta potential all varied with fertilizer application, with the impact maximizing after potassium sulfate was applied and minimizing when urea was applied.【Conclusion】Magnetizing irrigation water can significantly promote flocculation and sedimentation of clay particles;it can be used to alleviate clogging of irrigation pipe network by colloids and fine particles.
作者
赵雪
王照熙
张文倩
吕畅
牛文全
ZHAO Xue;WANG Zhaoxi;ZHANG Wenqian;LYU Chang;NIU Wenquan(Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas,Northwest A&F University,Yangling 712100,China;School of Water Conservancy and Civil Engineering,Northwest A&F University,Yangling 712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,China)
出处
《灌溉排水学报》
CSCD
北大核心
2022年第3期114-124,共11页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(52079112,51679205)
山东省重大创新工程项目(2020CXGC010808)。
关键词
磁化
絮凝
沉降
黏性颗粒
肥料
magnetization
flocculation
sedimentation
clay particles
fertilizer
