Water Science and Technology Vol 35 No 4 pp 149–156 © IWA Publishing 1997
Detoxification and recycling of wastewater by solar-catalytic treatment
H. Freudenhammer*, D. Bahnemann**, L. Bousselmi***, S.-U. Geissen*, A. Ghrabi***, F. Saleh****, A. Si-Salah*****, U. Siemon** and A. Vogelpohl*
*Institut für Thermische Verfahrenstechnik der TU Clausthal, Leibnizstraße 15 38678 Clausthal-Zellerfeld Germany
**Institut für Solarenergieforschung GmbH Hameln/Emmerthal, Sokelantstr. 5 30165 Hannover Germany
***Institut National de Recherche Scientifique et Technique, 43, Av. Charles Nicolles 1082 Cité Mahrajène Tunis Tunisia
****University of Damascus, Dept. of Chemistry, Faculty of Sciences Damascus Syria
*****Institut Algérien du Pétrole 35000 Boumerdes Algeria
ABSTRACT
An introduction to a joint research project is given which deals with the technical application of solar photocatalysis for wastewater detoxification. A non-concentrating thin-film fixed-bed reactor (TFFBR) is used to study applications and areas where a solar-catalytic treatment or recycling of wastewater is possible. This reactor excels by its low cost and an easy-to-build construction using molecular oxygen in air as the oxidising agent. The design parameters of the reactor as well as the process itself have been determined from the reaction kinetics of a model substance, the hydrodynamics and the mass transfer. The treatment of different real wastewaters was successfully carried out, and biologically pre-treated textile wastewater maximum solar degradation rate was about 3 g COD h-1 m-2. A comparison of reaction rates with artifical and solar illumination shows the necessity of outdoor experiments. Due to the reaction rates observed, photocatalysis is suitable as the final stage of purification of biologically or physically pretreated wastewater and will offer a great opportunity for sunrich areas.
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