某石油化工污染场地地下水中挥发性有机物污染特征及成因分析

Contamination characteristics and causes of volatile organic compounds in the groundwater at a petrochemical contaminated site

为了解典型污染场地浅层地下水微量有机污染特征,对西北某省会城市石油化工场地地下水中的挥发性有机污染物(VOCs)污染情况进行了调查。结果表明,污染场地地下水样品中挥发性有机污染物检出率为100%;检出率较高的是氯代烃和苯系物,检出率分别为60%和40%。超标组分为苯和1,2-二氯丙烷,苯超标率为30%,1,2-二氯丙烷超标率10%,苯最大检出浓度达1515μg/L。场地内的原油储存罐、污水隔油池的渗漏以及石油冶炼、机械加工过程工业废水不合理排放均为该场地地下水VOCs的重要来源;VOCs的理化性质以及污染场地地下水防污性能差是影响该场地地下水环境中VOCs归宿的主要因素。

Volatile organic contaminants（VOCs） pollution in the groundwater of a petrochemical contaminated site in a city of northwestern China was investigated.The results show that VOCs were detected in all groundwater samples,the most frequent detected VOCs are chlorinated hydrocarbons（CHCs） and BTEX.The detection rate of CHCs and BTEX are 60% and 40%,respectively.The concentration of Benzene and 1,2-Dichloropropene exceeds the standard of drinking-water,and thair over-standard rate is 30% and 10%,respectively.The maximum concentration of Benzene is 1515 μg/L,which exceeds the standard of drinking-water over 150 times.VOCs which released from the crude oil tank and wastewater treating pool are important sources of VOCs in groundwater in the contaminative fields.Factors affecting the VOCs concentrations of groundwater in the study area include the chemical and physicochemical properties of VOCs and high vulnerability of groundwater in this site.