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摘要

In a specific usecase the task was to treat the cleaning and rinsing solutions of a pharmaceutical production plant in a way that would avoid the need for subsequent incinerations of the wastewater.The critical substance exhibiting fish toxicity occurred in the wastewater with a concentration of only 2 ppm. Besides, due to this little load the heating value is extremely low. Conventional oxidation procedures like the known UV-PEROX method or the PEROXON process were hampered by the presence of biomass in the bioreactor and hence ineffective. VTU Technology has been engaged at the forefront of advanced oxidation process development for many years and the combination of electrochemical, photochemical and catalytic oxidation proved to be a convenient solution for this particular issue. The project started with a laboratory study to test the degradation of the active substance in a synthetic water sample with concentrations identical to the rinsing effluent of the bioreactor. By using standardized screening procedures, an individual process combination based on electrochemical and photochemical reactions supported by a promoter effected complete degradation. The main advantage of this combination setup is the exploitation of both the anodic and the cathodic reactions. By anodic oxidation the structure of the substance becomes amenable for further oxidation by hydroxyl radicals. These radicals - produced by cathodic reaction of hydrogen peroxide activated by the -catalyst and UV irradiation - are the active oxidizing agents and work effectively at ambient conditions.