Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Factors Affecting the Photochemical Treatment of Hazardous Waste (Journal Version).
Author Zepp, R. G. ;
CORP Author Environmental Research Lab., Athens, GA.
Year Published 1988
Report Number EPA/600/J-88/040;
Stock Number PB88-225487
Additional Subjects Waste treatment ; Hazardous materials ; Photochemical reactions ; Adsorption ; Reprints ; Hazardous wastes ; Photochemical treatment
Library Call Number Additional Info Location Last
NTIS  PB88-225487 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/29/1988
Collation 5p
The photochemical treatment of hazardous waste can be optimized by taking into account various factors that influence the rates of photochemical reactions. Physical factors that facilitate photochemical treatment include: (1) maximizing the irradiated surface to volume ratio of the system; (2) selecting a light source with a spectrum that strongly overlaps the absorption spectrum of the chromophore; and (3) vigorously mixing the reaction mixture. Although hazardous wastes are degraded by direct absorption of light, the overall rate of light-induced reactions can usually be accelerated by adding to the treatment system various dissolved or particulate substances that, on light absorption, produce reactive excited states or free radical intermediates that react with the waste. Examples of such additives include ozone, perixides, semiconducting metal oxides such as titanium dioxide, and various organic photosensitizers that efficiently photoproduce excited triplet states.