有机氯农药污染场地地下水抽水试验

伴随城市化进程和产业结构调整,我国出现许多污染场地亟待修复。通过某典型有机氯农药污染场地抽水试验论证抽出-处理修复方案应用于该污染场地地下水修复的可行性及获取抽出-处理工程设计所需要的参数,同时监测了特征污染物的浓度变化特征。该污染场地的地下水渗透系数为8.03m·d-1,抽水井影响半径为117.1m,长期抽水试验获得的单口井抽水量不低于170m3·d-1,回灌速度达到7m3·h-1。结果表明:该污染场地实施抽水是可行的,地下水量满足后续抽出-处理修复工程,可通过自来水回灌减缓修复过程抽水量下降趋势,但此过程也影响地下水的流动方向。同时,抽水过程可抽出大量的污染物,越靠近污染区域,抽提污染物的效果越明显;随着抽水的进行,污染物的浓度总体显现降低的趋势。此外,自来水回灌可稀释地下水中的污染物。

Conduction of a Pumping Test in a Typical Organo-chlorine Pesticide Contaminated Site

During the process of industrial development and urban restructuring,a lot of contaminated sites evolved,that yield danger for human beings and the environment and therefore need do be remediated.In order to remediate contaminated sites a lot of remediation techniques are available.One of the conventional site remediation is the so called"pump & treat"technique,in which the groundwater is pumped and treated above the ground "on-site".In order to examine the feasibility of pump-treat remediation on a specific site in Changzhou,contaminated with organo-chlorine pesticides and to obtain relative design parameters for the pump-treat remediation,a pumping test was conducted.During the pumping test contaminants concentrations were monitored.According to the pumping test,the permeability coefficient of this contaminated site was 8.03 m·d-1,the radius of influence was 117.1 m,respectively.The amount of single well pumping was not lower than 170 m3·d-1 and the recharging was 7 m3·h-1 at an average.These results indicated that the pump & treat remediation might be used for groundwater remediation at this site.The manner of recharge tap water could be used to slow down the decrease of water budget,but it affected the flow directions of groundwater.At the same time,the contaminants were pump out during the pumping process,and the closer to contaminated area,the more effectively it worked.Altogether,the concentrations of contaminants became lower during the pumping test conduction.