Humic acid enhanced remediation of an emplaced diesel source in groundwater. 1. laboratory-based pilot scale test

摘要

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. 2×5.5×1.8-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/ 1.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).