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首页> 外文会议>ASCE National Conference on Environmental and Pipeline Engineering Jul 23-26, 2000, Kansas City, Missouri >Degradation and Uptake of Benzene in Laboratory Phytoremediation Studies
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Degradation and Uptake of Benzene in Laboratory Phytoremediation Studies

机译：实验室植物修复研究中苯的降解和吸收

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In whole-plant laboratory studies, hybrid poplar trees were shown to impact a variety of fate and transport mechanisms for benzene. Laboratory experiments investigated the distribution of the contaminant in the plant tissues, degradation in the soil profile, and volatilization from both the soil and leaf tissues. A new testing system was developed that allowed for rapid testing that is more field-representative than earlier studies. Whole plants were utilized in a reactor design that included both a saturated and a vadose zone. The continuous feed reactors were supplied with a steady influent benzene stream to mimic plume conditions. The presence of the poplar trees enhanced the degradation rate of the benzene, and dramatically decreased the effluent mass of benzene. Benzene was also volatilized from the leaf tissues, providing evidence to the extent of plant enhanced volatilization that has not been previously documented. The observed degradation and removal pathways were a result of active/live trees. Reactors with killed controls did not exhibit the removal seen in the live tree replicates. The soil profile maintained higher degradation rates with the trees present. Causes for the higher degradation rates appeared to be larger microbial populations of benzene degraders and preferable redox conditions in the presence of the poplars. These results combined with previous hydroponic and related field scale studies to provide evidence that phytoremediation has potential for effective, efficient, and environmentally friendly application at benzene contaminated sites, and potentially other contaminated sites with biodegradable organics or VOCs.
机译：在整个植物的实验室研究中，杂种杨树显示出影响苯的多种命运和转运机制。实验室实验研究了污染物在植物组织中的分布，土壤剖面的退化以及土壤和叶片组织的挥发。开发了一种新的测试系统，该系统可以进行比以前的研究更具现场代表性的快速测试。整个植物被用于包括饱和区和渗流区的反应器设计中。向连续进料反应器供应稳定的流入苯物流以模拟羽状流条件。杨树的存在提高了苯的降解率，并显着降低了苯的出水量。苯还从叶组织中挥发出来，为植物增强挥发的程度提供了证据，而以前没有记录。观察到的降解和清除途径是活性/活树的结果。具有被杀死的对照的反应器没有表现出在活树复制物中看到的去除。有树木的土壤剖面保持较高的降解率。较高降解速率的原因似乎是苯降解剂的微生物数量较大，并且在存在杨树的情况下存在较好的氧化还原条件。这些结果与以前的水耕法和相关的田间规模研究相结合，提供了证据表明，植物修复技术有可能在苯污染的地点以及可能被生物降解的有机物或VOC污染的其他地点进行有效，高效和环保的应用。

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