Department of Environmental Biotechnology, UFZ-Helmholtz Centre for Environmental Research, Permoserstrasse 15, D-04318 Leipzig, Germany.
J Hazard Mater. 2012 Mar 30;209-210:510-5. doi: 10.1016/j.jhazmat.2012.01.067. Epub 2012 Jan 28.
In order to evaluate technology options for the treatment of groundwater contaminated with benzene and MTBE in constructed wetlands (CWs), a scarcely applied plant root mat system and two horizontal subsurface-flow (HSSF) CWs were investigated. The inflow load of benzene and MTBE were 188-522 and 31-90 mg d(-1)m(-2), respectively. Higher removal efficiencies were obtained during summer in all systems. The benzene removal efficiencies were 0-33%, 24-100% and 22-100% in the unplanted HSSF-CW, planted HSSF-CW and the plant root mat, respectively; the MTBE removal efficiencies amounted to 0-33%, 16-93% and 8-93% in the unplanted HSSF-CW, planted HSSF-CW and the plant root mat, respectively. The volatilisation rates in the plant root mat amounted to 7.24 and 2.32 mg d(-1)m(-2) for benzene and MTBE, which is equivalent to 3.0% and 15.2% of the total removal. The volatilisation rates in the HSSF-CW reached 2.59 and 1.07 mg d(-1)m(-2), corresponding to 1.1% and 6.1% of the total removal of benzene and MTBE, respectively. The results indicate that plant root mats are an interesting option for the treatment of waters polluted with benzene and MTBE under moderate temperatures conditions.
为了评估人工湿地（CWs）中受苯和 MTBE 污染地下水的处理技术方案，研究了一种应用较少的植物根垫系统和两个水平潜流（HSSF）CWs。苯和 MTBE 的进水负荷分别为 188-522 和 31-90 mg d(-1)m(-2)。所有系统在夏季均获得了更高的去除效率。在未种植的 HSSF-CW、种植的 HSSF-CW 和植物根垫中，苯的去除效率分别为 0-33%、24-100%和 22-100%；MTBE 的去除效率分别为 0-33%、16-93%和 8-93%。在植物根垫中，苯和 MTBE 的挥发速率分别为 7.24 和 2.32 mg d(-1)m(-2)，相当于总去除量的 3.0%和 15.2%。在 HSSF-CW 中，苯和 MTBE 的挥发速率分别达到 2.59 和 1.07 mg d(-1)m(-2)，分别相当于苯和 MTBE 总去除量的 1.1%和 6.1%。结果表明，在中温条件下，植物根垫是处理受苯和 MTBE 污染水的一种有趣选择。
