Elimination of persistent emerging micropollutants in a suspended-bed photocatalytic reactor: influence of operating conditions and combination with aerobic biological treatment
| Autor: | T. Rudenko, I. Kamenev, Anna Moiseev, K. Künnis-Beres, Natalja Pronina, Deniss Klauson, S. Kamenev, Joachim Deubener, Marina Krichevskaya |
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| Rok vydání: | 2016 |
| Předmět: |
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Photochemistry 0211 other engineering and technologies Sulfamethizole Portable water purification 02 engineering and technology 010501 environmental sciences 01 natural sciences Waste Disposal Fluid Catalysis Water Purification Adsorption medicine Bioreactor Physical and Theoretical Chemistry 0105 earth and related environmental sciences Titanium 021110 strategic defence & security studies Chromatography biology Chemistry biology.organism_classification Pseudomonas putida Activated sludge Chemical engineering Photocatalysis Oxidation-Reduction medicine.drug Waste disposal |
| Zdroj: | Photochemicalphotobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology. 15(12) |
| ISSN: | 1474-9092 |
| Popis: | A larger, lab-scale photocatalytic suspended-bed reactor using TiO2 sol-gel-coated expanded clay granules as a bed material was evaluated for oxidative removal of the persistent pharmaceuticals doxycycline, prednisolone, amoxicillin, and sulfamethizole, as well as their mixture, in ppm concentrations. The photocatalytic degradation potential of drug molecules increases as their adsorption affinity increases towards TiO2-containing coatings. The performance of the photocatalytic reactor in the removal of drugs was improved by optimizing the fluidization process parameters. The reactor operation at high bed loadings is determined by the abrasion resistance of the catalyst coating. The long-term stability of the coated bed was enhanced by optimal loading, achieving a higher removal rate while placing moderate mechanical stress on the coated granules. The photocatalytic pretreatment decreased the toxicity of doxycycline solutions to several bacterial strains, including the environmental bacterium Pseudomonas putida and bacterial strains freshly isolated from the activated sludge. The treatment of doxycycline-containing water with a combination of photocatalytic treatment and bio-oxidation resulted in 98% removal of the target in the bioreactor outlet, with no deterioration in the operation of the biological process. |
| Databáze: | OpenAIRE |
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