摘要
以上海市普陀区某1,2-二氯乙烷地下水污染场地为研究对象开展地下水污染相关研究,通过数值模拟分析污染物在自然条件下及抽水条件下的污染扩散趋势。根据场地前期环境调查结果,收集分析污染点位、浓度、深度及场地水文地质信息,利用GMS地下水模型系统中的MODFLOW与MT3DMS模型分别模拟该区域的地下水流场及1,2-二氯乙烷在不同抽提条件下的运移情况,分析污染物的运移规律。研究表明,初始污染浓度为7.2 mg/L的1,2-二氯乙烷在自然流场作用下,污染扩散主要受地下水流方向影响,经10 a扩散,污染点位中心污染物的浓度仍能达到2.7 mg/L,污染物扩散范围不断增大。抽提井的抽水作用能显著影响污染物的自然扩散,随着抽提井数量的增多,经700 d的抽提,污染羽中心污染浓度可降低至0.03 mg/L以下,满足《地下水质量标准》的第Ⅳ类筛选值的要求。
This study focused on groundwater pollution in a contaminated site with 1,2-dichloroethane in Putuo District,Shanghai,and conducted groundwater pollution-related research,employing numerical simulations to analyze the contaminant’s diffusion trends under both natural and pumping conditions.The study collected and analyzed data on pollutant locations,concentrations,depths,and the hydrogeological conditions of the site by the preliminary environment investigation result.The groundwater flow field in the area and the migration of 1,2-dichloroethane under different pumping conditions were simulated using the MODFLOW and MT3DMS models within the groundwater modeling system(GMS).The study indicated that under the influence of the natural groundwater flow field,the diffusion of 1,2-dichloroethane with initial concentration of 7.2 mg/L was primarily affected by the direction of groundwater flow.After a 10-year period,the concentration of pollutant at the center of the contamination site still remained at 2.7 mg/L,and the spread of the pollutant continued to increase.The pumping action of extraction wells had a significant impact on the natural dispersion of pollutants.With increase of extraction wells,the center concentration of the pollutant plume had decreased to below 0.03 mg/L after 700 days of pumping,meeting the requirement of Class IV screening value specified in the Groundwater Quality Standards.
作者
仇奕沁
徐子茜
QIU Yi-qin;XU Zi-qian(Shanghai Chengtou Environment Ecological Remediation Technology Co.,LTD,Shanghai 200232,China)
出处
《环境科学导刊》
2024年第4期37-43,55,共8页
Environmental Science Survey
基金
上海市国资委企业技术创新和能级提升项目-上海固废环保科创中心(一期)建设(CTKY-PTZX-2020-013)。
关键词
1
2-二氯乙烷
数值模拟
GMS
地下水
运移情况
1,2-dichloroethane
numerical
simulation
groundwater modeling system
groundwater
transport
