摘要
化工场地有机污染是地下水污染主要来源之一,对地下含水层生态和环境会造成严重破坏,影响地下水资源质量。基于江苏省某废弃化工厂地下水污染调查资料,采用有限差分法模拟和预测潜水含水层中石油烃的运移过程,探究石油烃在对流、吸附以及用溶解相和吸附相反应速率常数控制的一级动力学反应下的运移转化规律。结果表明,石油烃的运移和衰减速率缓慢,泄漏点石油烃浓度为10.9 mg/L,随着时间衰减,9 100 d后衰减至检测限0.6 mg/L,10 950 d时浓度为0.39 mg/L;石油烃的污染羽随地下水扩散,污染面积达12 773.28 m^(2),并污染水泵房浅层含水层,浓度为1.12 mg/L。此外,吸附相和溶解相反应速率常数以及分配系数的参数敏感性分析结果表明,石油烃污染面积和最大浓度对吸附相反应速率常数最为敏感。根据研究结果,石油烃污染运移和衰减速率缓慢,可以采用抽出处理法进行修复。
Organic pollution of chemical sites is one of the main sources of groundwater pollution,which cause serious damage to the ecology and environment of underground aquifers and affect the quality of groundwater resources.Based on the investigation data of groundwater pollution in an abandoned chemical plant in Jiangsu Province,the finite difference method was used to simulate and predict the migration process of petroleum hydrocarbons in submersible aquifers,and to investigate the migration and transformation rule of petroleum hydrocarbons under convection,adsorption and first-order kinetic reaction controlled by the rate constant of dissolved phase and adsorption reaction.The results showed that the migration and decay rate of petroleum hydrocarbons were slow,the concentration of petroleum hydrocarbons at the leak point was 10.9 mg/L,with time,it decayed to the detection limit of 0.6 mg/L after 9100 days,and the concentration was 0.39 mg/L at 10950 days;The pollution plume of petroleum hydrocarbons spreads with groundwater,and the pollution area reaches 12773.28 m^(2),and polluted the shallow aquifer of the water pump house,the concentration was 1.12 mg/L.In addition,the parameter sensitivity analysis result of adsorption phase,dissolution reaction rate constant and partition coefficient shows that the pollution area and maximum concentration of petroleum hydrocarbons are most sensitive to adsorption reaction rate constant.According to the research results,the migration and decay rate of petroleum hydrocarbon pollution is slow,and it can be repaired by pumping treatment.
作者
姚帅楠
孙洪广
胡韬
Yao Shuainan;Sun Hongguang;Hu Tao(College of Mechanics and Engineering Science,Hohai University,Nanjing 211100,China;Nanjing Jiangnan Small Chemical Industry Centralized Remediation Work Site Command Center,Nanjing 210038,China)
出处
《能源与环保》
2025年第4期67-75,共9页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金项目(U2267218,11972148)。
关键词
地下水污染
数值模拟
石油烃
敏感性分析
groundwater pollution
numerical simulation
petroleum hydrocarbon
sensitivity analysis
