Das Projekt "Treatment of Water and Wastewater by TiO2 Photocatalyzed Prices for Remove of Organsynthetic Contaminations and Metals" wird/wurde gefördert durch: Kommission der Europäischen Gemeinschaften Brüssel. Es wird/wurde ausgeführt durch: Universität Bremen, Fachbereich 2 Biologie,Chemie, Institut für Physikalische Chemie und Umweltchemie.Objectives: In our laboratory at Bremen, we are primarily interested in the aim of the UV mediated photodegradation alone, without the Ti02 catalysis. The aim of our investigation is to contribute to achieving an optimization of selected pesticide photodegradation by H202/UV light, understanding of the photodegradation mechanisms of the organic pollutants in homogeneous system, and acquiring the knowledge of the environmental significance of the pesticide degradation products. A kinetic model will be developed which relates the reaction rate of the target pesticides to the pesticide and hydrogen peroxide concentrations, the incident UV light intensity, and the effective path lengths of the specific photoreaction parameters used. Results so Far: Up to now, the degradation rate of Carbendazim and Carbofuran by ultraviolet radiation has been studied. Most of the experiments leading to the optimization of photocatalytic process with respect to pH, H2O2 addition, and UV source have been finished. With the increase of the initial pesticide concentration, the initial rate of the photodegradation increased correspondingly, and the presence of hydrogen peroxide had a marked effect on the rate of breakdown of the chemicals investigated. The photodegredation process of Carbendazim and Carbofuran followed first order kinetics. In the absence of H202, the degradation rate at pH=7 is larger than that at pH=4 and 10 and a positive trend became apparet with its initial concentration increased. But the effect of the pH on degradation rate disappeared in the presence of H202, because, it was covered by the large effect caused by H202 itself.