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Optimization of mild solar TiO2 photocatalysis as a tertiary treatment for municipal wastewater treatment plant effluents

Prieto-Rodriguez, L., Miralles-Cuevas, S., Oller, I., Fernandez Ibanez, P, Agüera, A., Blanco, J. and Malato, S. (2012) Optimization of mild solar TiO2 photocatalysis as a tertiary treatment for municipal wastewater treatment plant effluents. Applied Catalysis B: Environmental, 128 . pp. 119-125. [Journal article]

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URL: http://dx.doi.org/10.1016/j.apcatb.2012.03.034

DOI: 10.1016/j.apcatb.2012.03.034

Abstract

The appropriate catalyst concentration for industrial wastewater treatment is several hundred milligrams per liter in solar photoreactors. Nonetheless, when the purpose of eliminating emerging contaminants in municipal wastewater treatment plant effluents is for reuse of the water, and they are present at extremely low concentrations, a tertiary treatment with a much lower photocatalyst concentration might be possible. TiO2 concentrations of only tens of mg L−1 were selected to evaluate the influence of catalyst load, initial hydrogen peroxide dose and radiation intensity on the degradation rate of five emerging contaminants (100 g L−1 of ofloxacin, sulfamethoxazole, flumequine, carbamazepine, and 2-hydroxy- biphenyl) spiked in a real municipal wastewater treatment plant effluent. Response surface methodology based on a spherical central composite design was used to optimize the parameters to find the maximal degradation rate. The experiments were carried out using an Evonik P-25 titanium dioxide suspension in a Suntest solar simulator. It has been demonstrated that the use of hydrogen peroxide is highly rec- ommendable for working with TiO2 at low concentrations and high photon flux must be avoided. It has also been demonstrated that too low (less than 40 mg L−1 ) TiO2 concentration is not recommendable.

Item Type:Journal article
Keywords:Emerging contaminants Photocatalysis Solar photoreactors
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:37014
Deposited By: Dr Pilar Fernandez-Ibanez
Deposited On:13 Mar 2017 13:47
Last Modified:17 Oct 2017 16:27

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