Department of Civil and Environmental Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada.
Department of Civil and Environmental Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada.
J Hazard Mater. 2015 Mar 21;285:346-55. doi: 10.1016/j.jhazmat.2014.11.042. Epub 2014 Dec 3.
Self-sustaining treatment for active remediation (STAR) is an innovative soil remediation approach based on smoldering combustion that has been demonstrated to effectively destroy complex hydrocarbon nonaqueous phase liquids (NAPLs) with minimal energy input. This is the first study to explore the smoldering remediation of sand contaminated by a volatile NAPL (trichloroethylene, TCE) and the first to consider utilizing vegetable oil as supplemental fuel for STAR. Thirty laboratory-scale experiments were conducted to evaluate the relationship between key outcomes (TCE destruction, rate of remediation) to initial conditions (vegetable oil type, oil: TCE mass ratio, neat versus emulsified oils). Several vegetable oils and emulsified vegetable oil formulations were shown to support remediation of TCE via self-sustaining smoldering. A minimum concentration of 14,000 mg/kg canola oil was found to treat sand exhibiting up to 80,000 mg/kg TCE. On average, 75% of the TCE mass was removed due to volatilization. This proof-of-concept study suggests that injection and smoldering of vegetable oil may provide a new alternative for driving volatile contaminants to traditional vapour extraction systems without supplying substantial external energy.
自维持主动修复（STAR）是一种基于闷烧的创新土壤修复方法，已被证明可有效破坏复杂碳氢非水相液体（NAPL），只需最小的能量输入。这是首次探索利用闷烧修复受挥发性 NAPL（三氯乙烯，TCE）污染的砂体的研究，也是首次考虑利用植物油作为 STAR 的补充燃料。进行了三十次实验室规模的实验，以评估关键结果（TCE 破坏、修复速度）与初始条件（植物油类型、油：TCE 质量比、纯油与乳化油）之间的关系。几种植物油和乳化植物油配方被证明可通过自维持闷烧来支持 TCE 的修复。发现浓度至少为 14000mg/kg 的菜籽油可用于处理含有高达 80000mg/kg TCE 的砂体。平均而言，由于挥发，75%的 TCE 质量被去除。这项概念验证研究表明，植物油的注入和闷烧可能为驱动挥发性污染物进入传统蒸汽提取系统提供一种新的替代方法，而无需提供大量外部能量。
