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首页> 外文期刊>Environmental toxicology and chemistry >Bioturbation Facilitates DDT Sequestration by Activated Carbon Against Recontamination by Sediment Deposition
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Bioturbation Facilitates DDT Sequestration by Activated Carbon Against Recontamination by Sediment Deposition

机译：生物扰动通过活性炭促进DDT隔离，防止沉积物再污染

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We evaluated bioturbation as a facilitator for in situ treatment with a thin layer of activated carbon to treat dichlorodiphenyltrichloroethane (DDT)-contaminated sediment and contaminant influx by sediment deposition. Using the freshwater worm Lumbriculus variegatus as a bioturbator, microcosm time-series studies were conducted for 4 mo and monitored for DDT flux and porewater concentration profiles by polyethylene passive samplers. With bioturbators present, the thin-layer activated carbon amendment reduced DDT flux by 90% compared with the same simulated scenario without activated carbon amendment. In contrast, a clean sediment cap without activated carbon was ineffective in reducing flux when bioturbation was present. In simulated scenarios with contaminant influx through deposition of contaminated sediment, bioturbation facilitated in situ activated carbon treatment, reducing 4-mo DDT flux by 77% compared with the same scenario without bioturbation. Porewater concentration profiles and activated carbon dose profiles confirmed effective mixing of activated carbon particles down to 1-cm depth. A mass transfer model was developed to predict flux with consideration of bioturbation and sediment deposition processes. Predicted flux values were consistent with experimental results and confirm that bioturbation activity helps reduce DDT sediment-to-water fluxes in activated carbon-treated sediment with recontamination by contaminated sediment deposition. To our knowledge, this is the first study to combine experimental and modeling results showing how bioturbation enhances activated carbon amendment effectiveness against ongoing contaminant influx by sediment deposition. Environ Toxicol Chem 2018;37:2013-2021. (c) 2018 SETAC
机译：我们评估了生物扰动作为活性炭薄层原位处理的便利剂，以处理被二氯二苯基三氯乙烷（DDT）污染的沉积物和通过沉积物沉积引起的污染物涌入。使用淡水蠕虫Lumbriculus variegatus作为生物扰动器，进行了4个月的微观时间序列研究，并通过聚乙烯无源采样器监测了DDT通量和孔隙水浓度分布。与没有活性炭改性剂的相同模拟方案相比，存在生物扰动剂的情况下，薄层活性炭改性剂将DDT通量降低了90％以上。相反，当存在生物扰动时，没有活性炭的干净的沉积物盖在减少通量方面是无效的。在模拟的场景中，污染物通过污染物沉积而大量涌入，生物扰动促进了原位活性炭处理，与没有生物扰动的相同场景相比，4-mo DDT通量降低了77％。孔隙水浓度曲线和活性炭剂量曲线证实了活性炭颗粒有效地混合至1厘米深。考虑到生物扰动和沉积物沉积过程，开发了一种传质模型来预测通量。预测的通量值与实验结果一致，并证实生物扰动活性有助于减少被活性炭处理过的沉积物中的DDT沉积物-水通量，并通过被污染的沉积物沉积再污染。据我们所知，这是第一项结合实验和模拟结果的研究，显示了生物扰动如何增强活性炭的改性效果，以对抗沉积物沉积造成的持续的污染物涌入。 Environ Toxicol Chem 2018; 37：2013-2021。 （c）2018年SETAC

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