Department of Civil, Building and Environmental Engineering, Sapienza University of Rome, Via Eudossiana 18, 00184, Rome, Italy,
Environ Sci Pollut Res Int. 2014 Jan;21(2):1514-27. doi: 10.1007/s11356-013-2035-9. Epub 2013 Aug 10.
In this paper, a numerical model is presented that is capable of describing the complex set of biochemical processes that occur in chlorinated aliphatic hydrocarbon (CAH)-contaminated groundwater when an exogenous electron donor is added. The reactive pattern is based on the degradation pathways of both chlorinated ethanes and ethenes, and it includes electron donor production (H2 and acetate) from the fermentation of an organic substrate as well as rate-limiting processes related to electron acceptor competition. Coupling of the kinetic model to a convection-dispersion module is described. The calibration phase was carried out using data obtained at a real CAH-contaminated site in the north of Italy. Model simulations of different application scenarios are presented to draw general conclusions on the effectiveness of reductive dechlorination (RD) as a possible cleanup strategy. Early outcomes indicate that cleanup targets can only be achieved if source longevity is reduced. Therefore, metabolic RD is expected to produce beneficial effects because it is known to induce bioenhanced degradation and transformation of CAHs.
本文提出了一个数值模型，能够描述在添加外源电子供体时，受氯代脂肪烃 (CAH) 污染的地下水中发生的一系列复杂生化过程。该反应模式基于氯代乙烷和乙烯的降解途径，包括有机基质发酵产生的电子供体（H2 和乙酸盐）以及与电子受体竞争相关的限速过程。描述了将动力学模型与对流-弥散模块耦合。使用在意大利北部真实 CAH 污染场地获得的数据进行了校准阶段。提出了不同应用场景的模型模拟，以得出关于还原脱氯 (RD) 作为一种可能的清理策略的有效性的一般结论。早期结果表明，只有降低源的持久性才能实现清理目标。因此，代谢 RD 有望产生有益的效果，因为它已知会诱导 CAHs 的生物增强降解和转化。
