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首页> 外文期刊>Environmental Science & Technology >Modeling Active Capping Efficacy. 1. Metal And Organometal Contaminated Sediment Remediation
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Modeling Active Capping Efficacy. 1. Metal And Organometal Contaminated Sediment Remediation

机译：主动封顶功效建模。 1.金属和有机金属污染的沉积物修复

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Cd, Cr, Pb, Ag, As, Ba, Hg, CH_3Hg, and CN transport through sand, granular activated carbon (GAC), organoclay, shredded tires, and apatite caps was modeled by deterministic and Monte Carlo methods. Time to 10% breakthrough, 30 and 100 yr cumulative release were metrics of effectiveness. Effective caps prevented above-cap concentrations from exceeding USEPA acute criteria at 100 yr assuming below-cap concentrations at solubility. Sand caps performed best under diffusion due to the greater diffusive path length. Apatite had the best advective performance for Cd, Cr, and Pb. Organoclay performed best for Ag, As, Ba, CH_3Hg, and CN. Organoclay and apatite were equally effective for Hg. Monte Carlo analysis was used to determine output sensitivity. Sand was effective under diffusion for Cr within the 50% confidence interval (Cl), for Cd and Pb (75% Cl), and for As, Hg, and CH_3Hg (95% Cl). Under diffusion and advection, apatite was effective for Cd, Pb, and Hg (75% Cl) and organoclay was effective for Hg and CH_3Hg (50% Cl). GAC and shredded tires performed relatively poorly. Although no single cap is a panacea, apatite and organoclay have the broadest range of effectiveness. Cap performance is most sensitive to the partitioning coefficient and hydraulic conductivity, indicating the importance of accurate site-specific measurement for these parameters.
机译：Cd，Cr，Pb，Ag，As，Ba，Hg，CH_3Hg和CN通过沙，粒状活性炭（GAC），有机粘土，切碎的轮胎和磷灰石盖层的传输通过确定性和蒙特卡罗方法进行建模。突破10％的时间，30和100年的累积释放是有效性的指标。假设溶解度低于上限，有效的上限可防止上限浓度在100年后超过USEPA急性标准。由于较大的扩散路径长度，沙帽在扩散下表现最佳。磷灰石对Cd，Cr和Pb的对流性能最佳。有机粘土对Ag，As，Ba，CH_3Hg和CN表现最佳。有机粘土和磷灰石对汞同样有效。蒙特卡洛分析用于确定输出灵敏度。对于Cr，在50％置信区间（Cl），Cd和Pb（75％Cl）以及As，Hg和CH_3Hg（95％Cl）的扩散作用下，砂子都是有效的。在扩散和对流作用下，磷灰石对Cd，Pb和Hg（75％Cl）有效，有机粘土对Hg和CH_3Hg（50％Cl）有效。 GAC和碎轮胎的表现相对较差。尽管灵丹妙药没有一个单一的帽子，但磷灰石和有机粘土的作用范围最广。封盖性能对分配系数和水力传导率最敏感，表明对这些参数进行精确的现场特定测量非常重要。

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