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首页> 外文期刊>Environmental Science & Technology >Enhanced Degradation of TCE on a Superfund Site Using Endophyte-Assisted Poplar Tree Phytoremediation
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Enhanced Degradation of TCE on a Superfund Site Using Endophyte-Assisted Poplar Tree Phytoremediation

机译：内生菌辅助杨树植物修复技术在超级基金场地上提高三氯乙烯的降解

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摘要

Trichloroethylene (TCE) is a widespread environmental pollutant common in groundwater plumes associated with industrial manufacturing areas. We had previously isolated and characterized a natural bacterial endophyte, Enterobacter sp. strain PDN3, of poplar trees, that rapidly metabolizes TCE, releasing chloride ion. We now report findings from a successful three-year field trial of endophyte-assisted phytoremediation on the Middlefield-Ellis-Whisman Superfund Study Area TCE plume in the Silicon Valley of California. The inoculated poplar trees exhibited increased growth and reduced TCE phytotoxic effects with a 32% increase in trunk diameter compared to mock-inoculated control poplar trees. The inoculated trees excreted 50% more chloride ion into the rhizosphere, indicative of increased TCE metabolism in planta. Data from tree core analysis of the tree tissues provided further supporting evidence of the enhanced rate of degradation of the chlorinated solvents in the inoculated trees. Test well groundwater analyses demonstrated a marked decrease in concentration of TCE and its derivatives from the tree-associated groundwater plume. The concentration of TCE decreased from 300 μg/L upstream of the planted area to less than 5 μg/L downstream of the planted area. TCE derivatives were similarly removed with cis-1,2-dichloroethene decreasing from 160 μg/L to less than 5 μg/L and trans-1,2-dichloroethene decreasing from 3.1 μg/L to less than 0.5 μg/L downstream of the planted trees. 1,1-dichloroethene and vinyl chloride both decreased from 6.8 and 0.77 μg/L, respectively, to below the reporting limit of 0.5 μg/L providing strong evidence of the ability of the endophytic inoculated trees to effectively remove TCE from affected groundwater. The combination of native pollutant-degrading endophytic bacteria and fast-growing poplar tree systems offers a readily deployable, cost-effective approach for the degradation of TCE, and may help mitigate potential transfer up the food chain, volatilization to the atmosphere, as well as direct phytotoxic impacts to plants used in this type of phytoremediation.
机译：三氯乙烯（TCE）是广泛的环境污染物，常见于与工业生产区相关的地下水羽流中。我们之前已经分离并鉴定了天然细菌内生菌肠杆菌。杨树的PDN3菌株可快速代谢TCE，释放氯离子。现在，我们报告了在加利福尼亚州硅谷的Middlefield-Ellis-Whisman超级基金研究区域TCE羽流上成功进行的为期三年的内生菌辅助植物修复现场试验的发现。与模拟接种的对照杨树相比，接种的杨树显示出增加的生长和降低的TCE植物毒性作用，树干直径增加了32％。接种的树木将更多的氯离子排入根际，表明植物中TCE代谢增加。来自树木组织的树木核心分析的数据提供了进一步的证据，证明接种树木中氯化溶剂的降解速率提高了。测试井地下水分析表明，与树木相关的地下水羽流中三氯乙烯及其衍生物的浓度显着降低。 TCE的浓度从种植区上游的300μg/ L降至种植区下游的小于5μg/ L。类似地除去了三氯乙烯衍生物，下游的顺式1,2,2-二氯乙烯从160μg/ L降低到小于5μg/ L，反式1,2-二氯乙烯从3.1μg/ L降低到小于0.5μg/ L。种植树木。 1,1-二氯乙烯和氯乙烯的含量分别从6.8和0.77μg/ L降至报告的0.5μg/ L以下，这充分证明了内生接种树有效去除受影响地下水中三氯乙酸的能力。降解天然污染物的内生细菌与快速生长的杨树系统的结合为三氯乙烯的降解提供了一种易于部署，经济高效的方法，并可能有助于减轻食物链上的潜在转移，向大气的挥发以及直接对这种植物修复中使用的植物产生植物毒性影响。

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  • 来源
    《Environmental Science & Technology》 |2017年第17期|10050-10058|共9页
  • 作者

    Sharon L. Doty; John L. Freeman; Christopher M. Cohu; Joel G. Burken; Andrea Firrincieli; Andrew Simon; Zareen Khan; J. G. Isebrands; Joseph Lukas; Michael J. Blaylock;

  • 作者单位

    University of Washington, Seattle, Washington 98195-2100, United States;

    Intrinsyx Technologies Corporation, NASA Ames Research Park, Moffett Field, California 94035-1000, United States;

    Phytoremediation and Phytomining Consultants United, Grand Junction, Colorado 81507, United States;

    Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States;

    Dept. for Innovation in Biological, Agro-Food, and Forest Systems, University of Tuscia, Viterbo, Italy;

    Edenspace Systems Corporation, Purcellville, Virginia 20134, United States;

    University of Washington, Seattle, Washington 98195-2100, United States;

    Environmental Forestry Consultants LLC, New London, Wisconsin 54961, United States;

    Earth Resources Technology, Inc., Moffett Field, California 94035, United States;

    Edenspace Systems Corporation, Purcellville, Virginia 20134, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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