Journal
WATER SCIENCE AND TECHNOLOGY
Volume 71, Issue 6, Pages 823-831Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2015.013
Keywords
operating parameters; photocatalysis; response surface methodology; water disinfection
Funding
- Biochemical and Bioenvironmental Engineering Research Center (BBRC) at Sharif University of Technology
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In this work, the individual and interaction effects of three key operating parameters of the photocatalytic disinfection process were evaluated and optimized using response surface methodology (RSM) for the first time. The chosen operating parameters were: reaction temperature, initial pH of the reaction mixture and TiO2 P-25 photocatalyst loading. Escherichia coli concentration, after 90 minutes irradiation of UV-A light, was selected as the response. Twenty sets of photocatalytic disinfection experiments were conducted by adjusting operating parameters at five levels using the central composite design. Based on the experimental data, a semi-empirical expression was established and applied to predict the response. Analysis of variance revealed a strong correlation between predicted and experimental values of the response. The optimum values of the reaction temperature, initial pH of the reaction mixture and photocatalyst loading were found to be 40.3 degrees C, 5.9 g/L, and 1.0 g/L, respectively. Under the optimized conditions, Escherichia coli concentration was observed to reduce from 10(7) to about 11 CFU/mL during the photocatalytic process. Moreover, all these results showed the great significance of the RSM in developing high performance processes for photocatalytic water disinfection.
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