Van Stempvoort D R, Lesage S, Novakowski K S, Millar K, Brown S, Lawrence J R
National Water Research Institute, Burlington, ON, Canada.
J Contam Hydrol. 2002 Feb;54(3-4):249-76. doi: 10.1016/s0169-7722(01)00182-6.
The enhanced solubility of petroleum-derived compounds in humic acid solutions is the basis for a new groundwater remediation technology. In this unique pilot-scale test, a stationary contaminant source consisting of diesel fuel was placed below the water table in a model sand aquifer (1.2 x 5.5 x 1.8-m deep) and flushed with water at a flow rate of 2 cm/h over 5 years. At 51 days, laboratory grade humic acid was added to the water and maintained at a level of approximately 0.8 g/l. The addition of humic acid had only a small impact on the aqueous transport of the BTEX components, which were rapidly dissolved from the diesel, but had a large effect on the flushing of PAHs, including methylated naphthalenes (MNs). Binding to aqueous humic acid enhanced the solubilization of MNs two- to tenfold. During aqueous transport, biodegradation of the BTEX and PAHs occurred, limiting the lateral and longitudinal extent of the diesel contaminant plume in the model aquifer. It appears that through enhanced solubilization, the overall biodegradation rate of the MNs was increased. As the various MNs were depleted from the diesel source, the MN plume shrank and then disappeared.
石油衍生化合物在腐殖酸溶液中溶解度的提高是一种新型地下水修复技术的基础。在这个独特的中试规模试验中，一个由柴油组成的固定污染源被放置在一个模拟砂质含水层（1.2×5.5×1.8米深）的地下水位以下，并在5年的时间里以2厘米/小时的流速用水冲洗。在第51天，将实验室级腐殖酸添加到水中，并维持在约0.8克/升的水平。腐殖酸的添加对从柴油中迅速溶解的BTEX组分的水相迁移只有很小的影响，但对包括甲基萘（MNs）在内的多环芳烃的冲洗有很大影响。与水相腐殖酸的结合使MNs的溶解度提高了两到十倍。在水相迁移过程中，BTEX和多环芳烃发生了生物降解，限制了模型含水层中柴油污染物羽流的横向和纵向范围。似乎通过增强溶解作用，MNs的总体生物降解率提高了。随着各种MNs从柴油源中耗尽，MN羽流缩小然后消失。
