通过对洛阳市某 PTA 化工厂进行工程勘察和吸附实验、 生物降解实验、 土柱淋滤实验求取了包气带物质运移 的相关参数, 利用 Hydrus21D 软件对 COD Cr 在蓄水池下包气带中的迁移进行了模拟预测。结果显示, 不采取防渗 措施时, 正常工况、 非正常工况、 一般事故和风险事故 4 种工况下, COD Cr 从蓄水池底部超标迁移至潜水所需要的时 间分别为 514 a、 5 a、 419 a、 3 1 8 a, 该污水蓄水池污染当地地下水风险很高; 若在蓄水池下铺设 215 m 厚的黏性土垫 层, 则四种工况下 COD Cr 从蓄水池底部超标迁移至潜水所需要的时间分别为 12 1 2 a、 1015 a、 9 1 1 a、 6 1 8 a。

Engineering investigation and a series of experiments, including the static adsorption, biodegradation, and dynamic soil column leaching experiments, were conducted at a PTA chemical plant in Luoyang to determine the solute transport parameters in the vadose zone. The migration of COD Cr in the vadose zone of the sewage reservoir was simulated using Hydrus21D. The re 2 sults showed that (1) it takes 5. 4, 5, 4. 9, and 3. 8 years for COD Cr to migrate from the reservoir bottom to water table under the normal, abnormal, ordinary accident, and risk accident conditions respectively without any anti2seepage measures, and the groundwater pollution risk caused by the sewage reservoir is high; and (2) it takes 12 1 2, 10 1 5, 9 1 1, and 6 1 8 years for COD Cr to migrate from the reservoir bottom to water table under the normal, abnormal, ordinary accident, and risk accident conditions re 2 spectively if there is a 2 152m thick clay layer under the sewage reservoir.

国家科技支撑计划课题/ 城市发展中的地质环境风险评估与防控关键技术研究与示范0( 2012BAJ11B04) ; 中国地质调查局地质 调查项目/ 中原城市群城市地质环境地质调查0( 12120113004600)