氯苯在人工回灌过程中的迁移规律研究

Study on Migration of Chlorobenzene During Artificial Recharge

为控制区域地面沉降,计划开展相应的地下水人工回灌,但在拟采用的回灌水源中监测到氯苯等有机组分,因而确定回灌过程中氯苯的环境行为是十分必要的。室内模拟人工回灌过程中氯苯的迁移及氯离子示踪实验,实验结果表明,从回灌点至模拟柱两侧水流速度和渗透系数降低,阻滞系数变大;距回灌点由近及远氯苯浓度依次升高,稳定峰值逐渐降低,对称取样孔中水流下游的峰值高于上游;模拟回灌中存在氯苯的生物降解作用并伴随着Eh值的降低。

In order to control the regional land subsidence, the corresponding groundwater artificial recharge is planned to be conducted in the study area. Because the organic components such as chiorobenzene （CB） are found in the recharging water, it is important to determine the environment behavior of CB during the artificial recharge process. The result of indoor simulation experiment about migration of CB and chloride tracer during artificial recharge shows that from recharge point to the both ends of analog column, the flow velocity and coefficient of permeability is lower and the coefficient of retardation is larger; from the recharge point to the farther, the concentration of CB gradually increases, the stable peak value gradually decreases, and the peak value in downstream of symmetric sampling hole is higher than that in upstream; the biodegradation of CB occurs with the decrease of Eh value in simulated recharge.