Journal
WATER SCIENCE AND TECHNOLOGY
Volume 60, Issue 6, Pages 1419-1424Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2009.208
Keywords
adsorption; catalytic ozonation; methylene blue; ozone
Funding
- FONDECYT [1060304, 1060892]
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This paper compares experimental results on methylene blue (MB) removal systems based on ozone oxidation, zeolite adsorption, and simultaneous adsorption-oxidation using ozone in the presence of natural zeolite. The effect of pH (2-8), and the presence of radical scavengers ( sodium acetate) on process rates and removal efficiencies are assessed at laboratory scale. The experimental system consisted of a 1 L differential circular flow reactor and an ozone generator rated at 5 g O-3/h. Results show that ozone oxidation combined with zeolite adsorption increases the overall MB oxidation rate with respect to ozonation process and zeolite adsorption. In presence of free radical scavenger, only a 25% of reduction on MB removal rate are observed in the simultaneous treatment, as compared with 70% when ozonation treatment is used, suggesting that MB oxidation reactions take mainly place on the zeolite surface.
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