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VOCs污染场地风险管理策略的筛选及评估

钟茂生 姜 林 张丽娜 夏天翔 韩 丹 姚珏君 郑 迪

钟茂生, 姜 林, 张丽娜, 夏天翔, 韩 丹, 姚珏君, 郑 迪. VOCs污染场地风险管理策略的筛选及评估[J]. 环境科学研究, 2015, 28(4): 596-604.
引用本文: 钟茂生, 姜 林, 张丽娜, 夏天翔, 韩 丹, 姚珏君, 郑 迪. VOCs污染场地风险管理策略的筛选及评估[J]. 环境科学研究, 2015, 28(4): 596-604.
ZHONG Maosheng, JIANG Lin, ZHANG Lina, XIA Tianxiang, HAN Dan, YAO Juejun, ZHENG Di. Screening and Evaluation of Risk Management Strategies for a Site Contaminated by VOCs[J]. Research of Environmental Sciences, 2015, 28(4): 596-604.
Citation: ZHONG Maosheng, JIANG Lin, ZHANG Lina, XIA Tianxiang, HAN Dan, YAO Juejun, ZHENG Di. Screening and Evaluation of Risk Management Strategies for a Site Contaminated by VOCs[J]. Research of Environmental Sciences, 2015, 28(4): 596-604.

VOCs污染场地风险管理策略的筛选及评估

基金项目: 国家环境保护公益性行业科研专项(201409047);北京市科学技术委员会重大项目(D08040000360000)

Screening and Evaluation of Risk Management Strategies for a Site Contaminated by VOCs

  • 摘要: 以某VOCs(volatile organic compounds,挥发性有机化合物)污染场地为例,结合实地调查,将健康风险评估用于场地风险管理策略的筛选. 结果表明:①该场地不同深度土壤均受到氯仿、二氯甲烷和苯的污染,污染物垂向迁移特征明显,最大迁移深度达25.8 m,其中深度≤15.0 m的土壤污染较重. ②基于保守的通用场地概念模型对将其规划为居住用地时的健康风险进行评估显示,氯仿、二氯甲烷和苯的致癌风险分别达6.0×10-2、2.9×10-4、7.4×10-5,均超过可接受风险水平(1.0×10-6),三者修复目标分别为0.22、12.00和0.64 mg/kg. 如采取策略一,即将场地内超过修复目标的土壤进行清除,需修复的土壤深度达24.0 m,修复土方量为33.4×104 m3. ③结合污染物垂向分布及场地未来地下空间开发规划,提出策略二,即对0~15.0 m深度范围内重污染土壤进行清除异位修复、>15 m深度范围内土壤采取工程控制措施. 实施策略二后的风险评估结果显示,虽然>15.0 m深度范围内土壤中依然存在w(氯仿)超过修复目标的采样点,但致癌风险(8.3×10-8)远低于可接受水平;概率风险评估显示,该风险值对应的累计频率为99.5%,考虑各参数取值的不确定性后,风险模拟结果最大值也仅为1.06×10-7. 可见,策略二足够保守,能够保障未来居民的身体健康;与策略一相比,策略二可减少修复土方量6.4×104 m3,因此更具经济性,为风险管理策略的优选方案.

     

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