基于砂箱实验及数学模拟的地下水循环井修复研究进展

Advances in studies about the groundwater pollution remediation through thegroundwater circulation well using sandbox experiments and simulationmethods

针对当前严峻的地下水污染问题,地下水循环井(groundwater circulation well,GCW)作为一种地下水原位修复技术,可在井周形成局部水力环流并将污染物捕获至井内进行处理,弥补了异位修复技术环境扰动大、成本较高等缺陷,可针对非水相有机污染物实现较好的修复效果。该技术可与多项修复技术相结合,例如曝气、吹脱、表面活性剂、生物修复、电化学修复和化学氧化修复等,以达到强化修复地下水污染的目的。相关研究以砂箱实验和数学模拟两类研究方法为主,基于这两类方法,详细介绍了地下水循环井技术的发展过程与研究进展,重点梳理了GCW与其它修复技术联合作用下的修复机理,总结了不同环境及工况条件对修复效果的影响。针对我国GCW技术研究现状,今后可考虑与原位热修复技术结合,进一步拓宽理论研究的范围,并积极开展中试试验,以期为该技术在污染场地的实际应用提供参考。

In terms of the current serious situation of groundwater pollution,the groundwater circulation well(GCW)is a powerful in-situ remediation method,which can trigger a local hydraulic circulation around the well and capture contaminants into the well for subsequent treatments.The GCW covers the shortages of ex-situ remediation technologies such as large environmental disturbances and high costs,and can obtain better remediation performances for non-aqueous organic pollutants.Other remediation techniques like the aeration,blow-off,surfactant,bioremediation,electrochemical remediation,and chemical oxidation were often coupled with the GCW to enhance performances of removing contaminants in groundwater.Researches about the GCW were mainly based on two kinds of methods,the sandbox experiments and simulation methods.According to these two kinds of approaches,the development and research progress of the GCW were described in detail.The mechanism of the GCW coupled with other remediation technologies were emphasized.The influences of different environmental and working conditions on the remediation performance of GCW were also summarized.Considering the current situation of the GCW associated researches in China,coupling with in-situ thermal remediation technologies is promising.Likewise,pilot tests should be conducted with the aim of providing references for the practical application of the GCW in contaminated sites.