某化工污染场地土壤与地下水污染特征分析
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摘要
以我国南方某典型化工污染场地为研究对象,通过场地调查确定了研究区的主要污染物为六六六、苯、氯苯和二氯丙烷,并进一步分析了污染物在土壤和地下水中的分布特征。污染物在土壤中浓度主要以生产车间为中心向四周逐渐减小,浓度梯度较大;在垂向上已穿透潜水层,浓度峰值出现在潜水层的中下部。污染物在潜水层中的分布呈现出和土壤中相似的特征,并表现出向南迁移的趋势。污染物在承压水层中的浓度峰值点与土壤和潜水重合,受区域地下水流向的控制,呈现明显向北迁移的趋势。由于地表较厚亚黏土的存在,增强了承压水的防污性能,污染物主要被截留于亚黏土中。
In South China,a typical chemical pollution site as the research object,through the site investigation,the main pollutants in this area were determined including hexachlorocyclohexane two of benzene,chlorobenzene and dichloropropane,and further analysis of the distribution of contaminants in soil and groundwater were carried out.The concentration of pollutants in the soil was gradually reduced from the center of the production workshop to the surroundings in a large gradient.In the vertical direction,the depth of the phreatic water was penetrated.The distribution of pollutants in the phreatic water layer was similar to that in the soil and showed the trend of southward migration.The peak concentration of pollutants in the confined aquifer was coincident with the soil and phreatic water,which was controlled by the direction of groundwater flow in the region,showing the trend of northward migration.Because of the existence of thick clay,the anti-pollution performance of confined water was enhanced.
In South China,a typical chemical pollution site as the research object,through the site investigation,the main pollutants in this area were determined including hexachlorocyclohexane two of benzene,chlorobenzene and dichloropropane,and further analysis of the distribution of contaminants in soil and groundwater were carried out.The concentration of pollutants in the soil was gradually reduced from the center of the production workshop to the surroundings in a large gradient.In the vertical direction,the depth of the phreatic water was penetrated.The distribution of pollutants in the phreatic water layer was similar to that in the soil and showed the trend of southward migration.The peak concentration of pollutants in the confined aquifer was coincident with the soil and phreatic water,which was controlled by the direction of groundwater flow in the region,showing the trend of northward migration.Because of the existence of thick clay,the anti-pollution performance of confined water was enhanced.
引文
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[2]董敏刚,张建荣,罗飞,等.我国南方某典型有机化工污染场地土壤与地下水健康风险评估[J].土壤,2015,47(1):100-106.
[3]李定龙,徐冉,吕浩,等.某典型化工污染场地土壤修复方案研究[J].环境污染与防治,2015,37(7):94-100.
[4]韩春媚,李慧颖,杜晓明,等.化工污染场地土壤不饱和区典型氯代烃化合物的垂向分布特征[J].北京师范大学学报(自然科学版),2009,45(5/6):636-641.
[5]王兰化,李明明,张莺,等.某废弃化工场地地下水有机污染健康风险评价[J].地质调查研究,2012,35(4):293-298.
[6]吕晓立,邵景力,刘景涛,等.某石油化工污染场地地下水中挥发性有机污染特征及成因分析[J].水文地质工程地质,2012,39(6):97-102.