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

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.