Remediation of Contaminated Soil and Groundwater Using Humic Acid in Permeable Reactive Barrier for Pipeline Leakage

摘要

This paper presents the development of a new remediation technology of contaminated soil and groundwater using humic acid (HA) in permeable reactive barrier (PRB) for pipeline leakage. The objective of this study was to use humic acid that could be medium within a PRB to filter complex contaminated soil and groundwater containing chromium.Leakage of pollutants (such as hydrocarbon、 gasoline、 oik wastewater、 heavy metal et al) has a large economic and environmental impact. When a pipeline leak is large or undiscovered for a longer period of time, substantial volumes of gases and liquids can leak into the soil and groundwater, which can develop into dangerous situations involving costly remediation works.Traditional methods for remedying contaminated soil and groundwater from pipeline leakage, such as drilling and geochemical analysis, are destructive, time consuming and expensive. A PRB was determined to be the best option for remedying ground-water that has become contaminated with a wide range of organic contaminants (i.e., benzene, toluene, methylbenzene, xylene and polyaromatic hydrocarbons), heavy metals (i.e., lead and arsenic). The measurements show a significant increase of the adsorption of hexavalent chromium because of the complexion reaction between HA and Cr (Ⅵ) occurred under acidic condition. It could be concluded that HA could be used effectively on remediation of Cr (Ⅵ)-contaminated soil and groundwater in a wide range of pH, with or without sunlight.