摘要
用雨洪水进行地下水人工回灌时,水中的悬浮物易造成含水介质物理堵塞,致使回灌效率明显降低。本文在野外调查和采样的基础上,用河底沉积物进行了悬浮颗粒物的自由沉降试验,分别研究了颗粒物粒径、悬浮物浓度及环境温度对水中悬浮物去除的影响。研究表明,当沉降速度为1m/h时,粒径在18.1μm以上的颗粒物可以通过沉降完全去除;当沉降速度为1m/h时,悬浮物的初始浓度分别为115mg/L和516mg/L时,悬浮物的去除率分别为67.7%和81.3%;温度升高可以加快大颗粒物沉降,但当沉降速度为0.33m/h时,温度在18-50℃内变化对于7μm以下颗粒物沉降的影响很小。该研究结果可为人工回灌过程中的雨洪水预处理提供理论依据和技术指导。
The groundwater recharging efficiency will be decreased significantly due to aquifer clogged by the suspended particles in the water when recharging with rain flood.In this paper,based of field investigation and sampling,the sedimentation experiment is conducted using riverbed sediments to evaluate the impact of particle diameter,particle concentration and ambient temperature on the particle removal.The results shows that particles greater than 18.1μm could be removed effectively when sedimentation velocity is 1m /h.At the same sedimentation velocity,the removal rate is 67.7% and 81.3% with the initial concentration of 115 mg /L and 516 mg /L respectively.Increasing temperature could accelerate the sedimentation.However,it has little impact with the temperature ranging from 8℃ to 50℃ on the removal of particles less than 7μm when sedimentation velocity is 0.33 m /h.The study results could provide theoretical and technological support for the pretreatment of rain flood in the process of groundwater recharge.
出处
《工程勘察》
2014年第9期60-64,98,共6页
Geotechnical Investigation & Surveying
基金
国家自然科学基金项目(41172209)"抽咸注淡过程中孔隙含水层堵塞机制与效应研究"
国家公益性行业科技专项(201301090)"大沽河海水入侵监控与治理技术"
"十二五"国家科技计划课题项目(2012BAB12B03)"地热资源的绿色利用技术研究"
关键词
雨洪水
人工回灌
物理堵塞
悬浮物去除
rain flood
artificial recharge
physical clogging
removal of suspended solids
