Solar heterogeneous and homogeneous photocatalysis as a pre-treatment option for biotreatment

Solar heterogeneous and homogeneous photocatalysis as a pre-treatment option for biotreatment 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 treatmen 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. Research on Chemical Intermediates Springer Journals

Solar heterogeneous and homogeneous photocatalysis as a pre-treatment option for biotreatment

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Springer Netherlands
Copyright © 2007 by Springer
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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