Hong M S, Farmayan W F, Dortch I J, Chiang C Y, McMillan S K, Schnoor J L
Department of Civil & Environmental Engineering, The University of Iowa, Iowa City 52242, USA.
Environ Sci Technol. 2001 Mar 15;35(6):1231-9. doi: 10.1021/es001911b.
The feasibility of phytoremediation to both remediate and hydraulically contain a methyl tert-butyl ether (MTBE)-contaminated groundwater plume was investigated in a three-phase study that included the following elements: (i) a laboratory bioreactor study that examined the fate and transport of 14C-radiolabeled MTBE in hybrid poplar trees, (ii) a novel approach for a mathematical modeling study that investigated the influence of deep-rooted trees on unsaturated and saturated groundwater flow, and (iii) a field study at a Houston site with MTBE-contaminated groundwater where hybrid poplar trees were planted. In the laboratory study, the predominant fate pathway was uptake and evapotranspiration of [14C]-MTBE from leaves and stems of poplar cuttings rooted in hydroponic solution. The modeling study demonstrates that phytohydraulic containment of MTBE in groundwater by deep-rooted trees can be achieved. The field study demonstrated significant groundwater uptake of groundwater by deep-rooted trees via direct measurement in the first three seasons. The use of vegetation may provide a cost-effective in-situ alternative for containment and remediation of MTBE-contaminated groundwater plumes.
在一项分三个阶段的研究中,对植物修复技术修复并水力控制甲基叔丁基醚(MTBE)污染的地下水羽状物的可行性进行了调查,该研究包括以下内容:(i)一项实验室生物反应器研究,考察了14C放射性标记的MTBE在杂交杨树中的归宿和迁移;(ii)一种数学建模研究的新方法,研究深根树木对非饱和和饱和地下水流的影响;(iii)在休斯顿一个MTBE污染地下水场地进行的实地研究,在那里种植了杂交杨树。在实验室研究中,主要的归宿途径是[14C]-MTBE从水培溶液中生根的杨树插条的叶子和茎中被吸收和蒸发蒸腾。建模研究表明,深根树木可以实现对地下水中MTBE的植物水力控制。实地研究通过在前三个季节的直接测量表明,深根树木对地下水有显著的吸收。植被的使用可能为控制和修复MTBE污染的地下水羽状物提供一种经济有效的原位替代方法。