URS Corporation, 1600 Perimeter Park Way, Raleigh, NC 27560, USA.
Int J Phytoremediation. 2013;15(10):911-23. doi: 10.1080/15226514.2012.687018.
The results of a pilot-scale phytoremediation study are reported in this paper. Small plots of trees established on a closed municipal waste landfill site were irrigated with recovered groundwater containing 1,4-dioxane (dioxane) and other volatile organic compounds (VOCs). The plots were managed to minimize the leaching of irrigation water, and leaching was quantified by the use of bromide tracer. Results indicated that the dioxane (2.5 microg/L) was effectively removed, probably via phytovolatilization, and that a full-scale phytoremediation system could be used. A system is now in place at the site in which the recovered groundwater can be treated using two different approaches. A physical treatment system (PTS) will be used during the winter months, and a 12 ha phytoremediation system (stands of coniferous trees) will be used during the growing season. The PTS removes VOCs using an air-stripper, and destroys dioxane using a photo-catalytic oxidation process. Treated water will be routed to the local sewer system. The phytoremediation system, located on the landfill, will be irrigated with effluent from the PTS air-stripper containing dioxane. Seasonal use of the phytoremediation system will reduce reliance on the photo-catalytic oxidation process that is extremely energy consumptive and expensive to operate.
本文报告了一项小规模植物修复研究的结果。在一个封闭的城市垃圾填埋场上建立的小树种植区用含有 1,4-二恶烷（二恶烷）和其他挥发性有机化合物（VOCs）的回收地下水进行灌溉。这些种植区的管理旨在最大限度地减少灌溉水的浸出，并通过使用溴化物示踪剂来量化浸出。结果表明，二恶烷（2.5μg/L）被有效地去除，可能是通过植物挥发，并且可以使用全规模的植物修复系统。目前该系统已在该地点投入使用，其中回收的地下水可以使用两种不同的方法进行处理。冬季将使用物理处理系统（PTS），而在生长季节将使用 12 公顷的植物修复系统（针叶林）。PTS 使用空气汽提器去除 VOCs，并使用光催化氧化工艺破坏二恶烷。处理后的水将被输送到当地的污水系统。位于垃圾填埋场上的植物修复系统将用来自 PTS 空气汽提器的含有二恶烷的废水进行灌溉。季节性使用植物修复系统将减少对光催化氧化工艺的依赖，该工艺非常耗能且运营成本高昂。
