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首页> 外文期刊>Environmental Science & Technology >Measuring and Modeling Organochlorine Pesticide Response to Activated Carbon Amendment in Tidal Sediment Mesocosms
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Measuring and Modeling Organochlorine Pesticide Response to Activated Carbon Amendment in Tidal Sediment Mesocosms

机译：测量和建模潮汐沉积过程中有机氯农药对活性炭修正的响应

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摘要

Activated carbon (AC) sediment amendment for hydrophobic organic contaminants (HOCs) is attracting increasing regulatory and industrial interest. However, mechanistic and well-vetted models are needed. Here, we conduct an 18 month field mesocosm trial at a site containing dichlorodiphenyltrichloroethane (DDT) and chlordane. Different AC applications were applied and, for the first time, a recently published mass transfer model was field tested under varying experimental conditions. AC treatment was effective in reducing DDT and chlordane concentration in polyethylene (PE) samplers, and contaminant extractability by Arenicola brasiliensis digestive fluids. A substantial AC particle size effect was observed. For example, chlordane concentration in PE was reduced by 93% 6 months post-treatment in the powdered AC (PAC) mesocosm, compared with 71% in the granular AC (GAC) mesocosm. Extractability of sediment-associated DDT and chlordane by A brasiliensis digestive fluids was reduced by at least a factor of 10 in all AC treatments. The model reproduced the relative effects of varying experimental conditions (particle size, dose, mixing time) on concentrations in polyethylene passive samplers well, in most cases within 25% of experimental observations. Although uncertainties such as the effect of long-term AC fouling by organic matter remain, the study findings support the use of the model to assess long-term implications of AC amendment.
机译：疏水性有机污染物（HOC）的活性炭（AC）沉积物改良剂正引起越来越多的法规和工业兴趣。但是，需要机械和经过严格审查的模型。在这里，我们在一个包含二氯二苯基三氯乙烷（DDT）和氯丹的地点进行了为期18个月的田间试验。应用了不同的AC应用，并且首次在不同的实验条件下对最近发布的传质模型进行了现场测试。交流处理可有效减少聚乙烯（PE）采样器中的滴滴涕和氯丹浓度，以及巴西棕榈油菌消化液的污染物提取能力。观察到明显的AC粒径效应。例如，粉末状AC（PAC）中型膜在处理后6个月，PE中的氯丹浓度降低了93％，而粒状AC（GAC）中型膜中的氯丹浓度降低了71％。在所有交流处理中，巴西利亚消化液对沉积物相关滴滴涕和氯丹的可萃取性至少降低了10倍。该模型很好地再现了各种实验条件（粒径，剂量，混合时间）对聚乙烯无源采样器中浓度的相对影响，在大多数情况下，实验观察值的误差在25％以内。尽管仍然存在诸如有机物对长期AC结垢的影响等不确定性，但研究结果支持使用该模型评估AC修正的长期影响。

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  • 来源
    《Environmental Science & Technology》 |2016年第9期|4769-4777|共9页
  • 作者

    Jay M. Thompson; Ching-Hong Hsieh; Thomas P. Hoelen; Donald P. Weston; Richard G. Luthy;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-5080, United States;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-5080, United States;

    Chevron Energy Technology Company, Richmond, California 94801, United States;

    Department of Integrative Biology, University of California, Berkeley, California 94720-3140, United States;

    Stanford University, Room 191, Yang & Yamazaki Environment & Energy Building, 473 Via Ortega, Stanford, California 94305-4020,Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-5080, 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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