| 英文摘要 |
The objective of this study is to assess the potential of combining three different treatment processes to clean up fuel oil contaminated sites. In this study, a concept of “treatment train” has been proposed. The first remedial phase applies surfactant flushing to remove the major amount of petroleum hydrocarbons in the soils. Thus, more than 50 to 60% of the total petroleum hydrocarbons (TPH) can be reduced in soils.The second phase is the chemical oxidation process applying Fenton-like technique. Approximately 20 to 30% of the remaining TPH could be reduced after the oxidation process. The residual 10 to 20% of the TPH would be appropriate for the third natural bioremediation or natural attenuation process. Results from the bench-scale study indicate that 5 wt% of the applied surfactant (Simple Green) is able to remove 60% of the initial TPH (10,000 and 50,000 mg/kg). Results from the Fenton-like study also reveal that approximately 60% of the initial TPH (5,000 mg/kg) can be reduced via the oxidation process.Results from the column experiment indicate that approximately 70 to 90% of TPH could be removed after the water and surfactant flushing. The Fenton-like oxidation is able to remove 17% of the remaining TPH. Thus, more than 90% of initial TPH could be removed using the three-stage treatment scheme. Results of this study will aid in designing a system for field application.The proposed treatment scheme would be expected to provide a more efficient and cost-effective alternative to remediate fuel-oil contaminated sites.This developed remedial scheme can also be applied for other non-aqueous phase liquid contaminated sites.Because the developed integrated remediation system is able to remediate the fuel-oil contaminated soil and groundwater effectively, this system would be accepted as a sound technology in the remediation market. Moreover, this system would not cause any adverse impact on the subsurface environment, and thus, it would be a more environmentally friendly technology compared to other technologies currently in use.
|