AGRO 182 |
| Landfill leachates are complex, heterogeneous mixtures that containing levels of dissolved organic matter (DOM) that far exceed those in domestic wastewaters. On-site advanced oxidation followed by dispersed surface application has been suggested as a treatment option, but little is known about the oxidation potential of the high molecular weight chromorphoric component (CDOM) of leachate. We have used a combination of 3-dimensional excitation-emission matrix fluorescence spectroscopy (EEMS) and ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to characterize the changes in leachate DOM after oxidation by UV irradiation and ozonation. EEMS measurements indicate that about 93% of the fluorescent components of leachates can be removed after 2 hr of ozone or ozone/UV oxidation. High-field (9.4 Tesla) FT-ICR MS was able to resolve fully the individual compounds in the treated leachate DOM and to identify the fluorescesing components that were removed. |
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Environmental Forensics
8:50 AM-11:40 AM, Wednesday, August 20, 2008 Crowne Plaza City Center -- Independence A/B, Oral
Division of Agrochemicals |