石油污染土壤异位修复生物堆建造关键技术研究

Research on Key Technologies for Construction of Bio-pile for Ex-situ Remediation of Petroleum Contaminated Soil

石油污染土壤生物修复技术是未来最具前景的低成本环保治理技术。结合异位生物堆修复关键控制指标,基于土壤多孔介质特性,建立了生物堆通风及灌溉数学模型,数值模拟了强制通风及灌溉过程生物堆内氧气和水的分布规律,给出了通风筛管及注水筛管最优布置方案,分析了通风速度及注水时间对生物堆温度的影响。结果表明:在生物堆建造尺寸确定的情况下,存在最佳的通风筛管及注水筛管布置方案,短时间歇通风对生物堆内温度影响较小,注水灌溉对生物堆内温度有一定影响,堆内温度变化前缘滞后于水相流动前缘。

Oil-contaminated soil bioremediation technology is the most promising low-cost environmental protection technology in the future.Combining the key control indicators of ex-situ biopile restoration,and based on the characteristics of soil porous media,a mathematical model of biopile ventilation and irrigation was established.The distribution of oxygen and water in the biopile during forced ventilation and irrigation was simulated,and the optimal layout of ventilation screens and water injection screens was given,and the influence of ventilation speed and water injection time on the temperature of the biopile was analyzed.The results shown that when the size of the biopilewas determined,therewas an optimal layout of ventilation screens and water injection screens.Short-term intermittent ventilation had little effect on the temperature in the biopile,and water injection irrigation had a certain impact on the temperature in the biopile.The leading edge of temperature change in the stack lagged behind the leading edge of water phase flow.