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- Title
Solar heterogeneous and homogeneous photocatalysis as a pre-treatment option for biotreatment.
- Authors
Oller, Isabel; Fernández-Ibáñez, Pilar; Maldonado, Manuel I.; Pérez-Estrada, Leonidas; Gernjak, Wolfgang; Pulgarín, César; Passarinho, Paula C.; Malato, Sixto
- Abstract
In this paper, we present pilot-scale solar Photo-Fenton and TiO2 treatment of a model compound (α-methylphenylglycine) dissolved in 500 mg/l concentration in water. Not only contaminant disappearance and mineralisation were evaluated, but also enhancement of biodegradability. The solar photoreactors, composed of 4.16 m2 of compound parabolic collectors, had a total volume of 82 l (44.6 l illuminated). Treatment was successful with both Advanced Oxidation Processes (AOPs) tested, but photo-Fenton was shown to be by far more efficient from the kinetic and practical point of view. To find out the conditions for biocompatibility using the AOPs as a pre-treatment, waste water after certain degradation time, unacclimated municipal sludge and mineral nutrients were placed together and evaluated by the Zahn–Wellens (Z-W) test. Biodegradability was enhanced (70% biodegradable) by both AOPs, but photo-Fenton was demonstrated to be more efficient, requiring a treatment time one order of magnitude shorter than TiO2. Hydrogen peroxide management for reduced consumption and elimination prior to discharging water to the biotreatment step is also discussed in detail.
- Subjects
PHOTOCATALYSIS; TITANIUM dioxide; PHOTOCATALYTIC water purification; TRACE elements in water; CHEMICAL reactors; HYDROGEN peroxide
- Publication
Research on Chemical Intermediates, 2007, Vol 33, Issue 3-5, p407
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1163/156856707779238586