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Advances in Materials Science and Engineering
Volume 2012, Article ID 679206, 6 pages
http://dx.doi.org/10.1155/2012/679206
Research Article

Treatment of Color Filter Wastewater by Fresnel Lens Enhanced Solar Photo-Fenton Process

Department of Safety, Health, and Environmental Engineering, National United University, Miao-Li 36063, Taiwan

Received 17 February 2012; Accepted 27 March 2012

Academic Editor: Yu-Pei Huang

Copyright © 2012 Wen-shiuh Kuo and Chia-ling Wu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Treatment of color filter wastewater using solar photo-Fenton process enhanced by high-concentrating Fresnel lens was investigated in this paper. Optimal reaction conditions based on response surface methodology (RSM) were established as under an initial pH of 5, a [H2O2]0/COD0 ratio of 1~1.35 and a [H2O2]0/[Fe2+]0 ratio of 15 for a reaction time of 60 min, which could reach a readily biodegradable level, that is, the biodegradability (BOD5/COD) of wastewater was more than 0.3. With the assistance of Fresnel lens, the solar photo-Fenton process increased the COD degradation rate and mineralization rate by a factor of 4.5 and 6.5, respectively. In addition, the microtoxicity (TU50) of wastewater was almost diminished after a 60 min of treatment, whereas the microtoxicity of treated wastewater without the assistance of Fresnel lens remained a TU50 value of 1.166. This could be mainly due to the concentrating effect of Fresnel lens for solar energy, resulting in an increase of 2~3 times of solar light intensity and a raising heat irradiation in terms of 15~30 °C of wastewater temperature. These results revealed that solar energy could be concentrated effectively by using Fresnel lens and showed a significant promoting effect on the photo-Fenton reaction for treating color filter wastewater.