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首页> 外文期刊>Canadian Geotechnical Journal >Examining fly ash as a sorbent for benzene, trichloroethylene, and ethylbenzene in cement-treated soils
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Examining fly ash as a sorbent for benzene, trichloroethylene, and ethylbenzene in cement-treated soils

机译：检查粉煤灰作为水泥处理土壤中苯，三氯乙烯和乙苯的吸附剂

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摘要

The objective of this study was to examine the potential for beneficial reuse of fly ash as a sorbent for benzene, trichloroethylene, and ethylbenzene in soils treated with cement (i. e., cement-based solidification/stabilization (S/S)). Batch testing was performed with soil-cement mixtures containing fly ash and compared with similar samples with humic acid as a source of organic carbon. The experimental batch test results were fit to the Freundlich sorption model assuming both linear and nonlinear behavior. It was found that the level of sorption is low for benzene and trichloroethylene, but relatively higher for ethylbenzene. Cement addition appeared to not only decrease sorption values obtained for fly ash, but also eliminate the nonlinear sorptive behavior, likely due to the blocking-coating of sorption sites. To demonstrate the practical application of the sorption observed, a hypothetical contaminated site is modeled with a one-dimensional contaminant transport program. It iss shown that the addition of fly ash can potentially reduce offsite migration of trichloroethylene (TCE), but is more effective at reducing ethylbenzene migration, for the time frames considered in the modeling.
机译：这项研究的目的是研究粉煤灰作为水泥处理过的土壤中苯，三氯乙烯和乙苯的吸附剂的有益再利用的潜力（即水泥基固化/稳定化（S / S））。使用含有粉煤灰的土壤-水泥混合物进行批处理测试，并将其与类似样品（以腐殖酸为有机碳源）进行比较。假定线性和非线性行为，批次试验的实验结果适合Freundlich吸附模型。发现苯和三氯乙烯的吸附水平较低，而乙苯的吸附水平较高。水泥的加入似乎不仅降低了粉煤灰获得的吸附值，而且消除了非线性吸附行为，这可能是由于吸附位点的封闭涂层所致。为了证明所观察到的吸附的实际应用，使用一维污染物传输程序对假设的污染部位进行建模。结果表明，在建模中考虑的时间范围内，添加粉煤灰可以潜在地减少三氯乙烯（TCE）的异位迁移，但在减少乙苯迁移方面更为有效。

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