基于砂槽电化学-水动力学循环系统氯代烃反应迁移实验与模拟研究

在室内砂槽实验尺度，建立了潜水-微承压含水层中电化学-水动力循环系统下混合氯代烃生物降解的反应迁移模型，求取了混合氯代烃体系中各组分的反应动力学参数，并基于模型探究了含水层性质及工艺参数对该修复过程的影响机制.研究结果表明:（1）增大抽水流量可加快反应速率常数大的污染物降解，同时也会抑制反应速率常数较小的污染物去除.（2）增大电流强度和井内电极对氯代烃的好氧降解和厌氧脱氯过程分别具有促进和抑制作用.（3）含水层非均质性越强，氯代烃降解速率越小，这尤其体现在低渗区，且含水层非均质性对易降解污染物修复效果的影响较小. 

Experimental and Simulation Study on Reaction Migration of Chlorinated Hydrocarbons Based on Electrochemical-Hydrodynamic Circulation System in Sand Tank

Using a subsurface electrochemical-hydrodynamic circulation system as a remediation technology, this study developes a reactive transport model of mixed chlorinated hydrocarbons in laboratory sand box experiments. The reaction kinetic parameters of each typical chlorinated hydrocarbon are estimated, revealing the influence mechanisms of aquifer properties and technological parameters on this remediation performance through the electrochemical-hydrodynamic circulation system installed in the sand tank experiment. The results indicate that: (1) An increasing pumping rate can accelerate the degradation of chlorinated hydrocarbons with large reaction rate, on the contrary, a greater pumping rate inhibits the degradation with small reaction rate. (2) An increasing electric current intensity and the in-well electrode facilitate and inhibit the aerobic degradation and anaerobic dechlorination of chlorinated hydrocarbons, respectively. (3) A stronger heterogeneity of aquifer leads to a worse performance of chlorinated hydrocarbon degradation, especially in the low-permeability region; and the influence of aquifer heterogeneity on the remediation performance of easily degradable pollutants is very slight.