热强化循环井驱动热量传输及苯胺修复效果  

Study on heat transfer and aniline remediation effect of thermal enhanced circulation well

作　　者：鲁亮 蒲生彦 李博文 LU Liang;PU Sheng-yan;LI Bo-wen(State Key laboratory of Geohazard Prevention and Geoenvironment Protection,State Environmental Protection Key laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution,Chengdu University of Technology,Sicuan Chengdu 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都理工大学国家环境保护水土污染协同控制与联合修复重点实验室,四川成都610059

出　　处：《中国环境科学》2023年第9期4639-4647,共9页China Environmental Science

基　　金：国家重点研发计划项目(2020YFC1808300);国家自然科学基金资助项目(42007167)。

摘　　要：通过耦合原位加热的方法以强化循环井对半挥发性有机污染物的修复效果.重点研究了曝气流量、升温温度以及地下水流速对修复过程中传热规律的影响,并探究了热强化循环井对苯胺污染地下水的修复效果.结果表明:热量的传递主要依靠循环井的水力激发作用并可以用指数函数模拟升温面积随时间的变化规律.在中砂含水层介质中,曝气流量0.3m3/h、升温温度60℃、地下水流速0.2m/d时,传热效果最佳.强化修复苯胺污染地下水过程中,逐渐形成一个以循环井为中心的有机物高效修复区域.累计修复48h后,苯胺的平均浓度由97.95mg/L下降至0.168mg/L.对比单一的循环井技术,修复效果提高了25.8%,有效避免了拖尾现象的发生.In-situ thermal remediation technology was adopted to enhance the remediation effect of circulation well on semi-volatile organic pollutants in this study.The effects of aeration flow rate,heating temperature and groundwater velocity on the heat transfer law of thermal enhanced circulation well were primarily investigated.Additionally,the remediation effect of aniline contaminated groundwater by thermal enhanced circulation well was simulated.The results revealed that the heat transfer law mainly depends on the hydraulic stimulation of the circulation well.The variation of the heating area with time can be accurately represented by an exponential function.In the medium sand aquifer,when the aeration flow rate was 0.3m^(3)/h,the temperature was 60℃,and the groundwater flow rate was 0.2m/d,the heat transfer has the best operation effect.In the process of enhanced remediation of aniline contaminated groundwater,an efficient remediation area centered on the circulating well was gradually formed.After 48h of remediation,the average concentration of aniline decreased from 97.95mg/L to 0.168mg/L.In compared with the single circulating well technology,remediation effect has been improved 25.8%by integrated remediation technology,effectively avoiding the occurrence of tailing phenomena.

关 键 词：循环井 原位热修复 传热规律 苯胺 强化修复效果 

分 类 号：X523[环境科学与工程—环境工程]