地下水中污染物的迁移传输及排泄通量研究

以辽宁某化工污染场地为研究对象,结合场地调查结果,应用地下水模型系统软件(GMS)中的MODFLOW和RT3D模型,建立了地下水中污染物的数值模型,探讨其迁移传输及排泄通量。根据模拟结果,地下水中苯、二氯苯和三氯苯的污染羽约在20年后达到动态平衡,污染羽不再随时间变化,污染物的自然衰减速率与污染源释放速率达到平衡。排泄通量估算表明:地下水向河流排泄的量在20年时达到稳定,地下水中苯、二氯苯和三氯苯向河流的排泄通量分别为每天180 g、6 100 g和5.5 g。由于污染物会导致污染生态环境和健康风险,建议从控制污染源、实施污染源区修复和切断迁移传输途径等多种措施控制风险。

Contaminants Transport and Mass Discharge in Groundwater in Contaminated Site

Contaminated site in Liaoning Province was selected to study the contaminants transport and mass discharge using numerical modeling based on site investigation results.The transport model in groundwater was developed using MODFLOWw and RT3D in Groundwater Model System（GMS）.Based on the modeling results, the plume shape of benzene, dichlorobenzene and trichlorobenzene will not be changed significantly after 20 years as the natural attenuation rate and source release rate will reach the steady state at the twentieth year.According to the estimation, the mass discharge will reach the steady state within 20years approximately.At the steady state, the groundwater mass discharges will be 180 g, 6100 g and 5.5 g for benzene, dichloro-benzene and trichlorobenzene, respectively. Considering the ecological and human health risk resulted from these three contami-nants, the recommendations for risk management include sources control, sources remediation and migration pathways control.