Poroese Biotraeger fuer die Abwasserbehandlung

The availability of an anaerobic reactor is low because of the very long relaxing period in case of a breakdown of the population. Therefore anaerobic systems are limited to few types of industrial and agricultural effluents with high biodegradability. The fixed bed reactor with tower packing is one way to a steady process with a high decomposition rate. Plastic waste products are often used as carrier for bio films because of their low costs, but their characteristics are not optimal and contain the risk of toxic or inhibiting additives. So called high-rate fixed bed reactors use modern contact materials made from special porous glass e.g. Siran and others. The implementation of these systems is combined with high costs concerning the fixed bed and the peripheral equipment. Special granules for waste water treatment process were manufactured and tested at the FILK gGmbH, Freiberg. The efforts aimed at multiple utilisation as well as physical and biological filter as fixed and fluidized bed. Summarizing the expected features: 1. low budget production, 2. adhesion of biological slime, 3. physical/chemical adsorption, 4. nutrient and trace components. Various kinds of test specimens were created by extrusion of foamed polyethylene (PE-LD) and additives. The adsorption depends on pore structure and surface and distribution of pore sizes. Macropores combined with a hydrophilic micro relief speed up the settlement of biological slime and improve the density of colonization. The adhesion of bio film depends on the water sorption. The SEM-analysis showed an open micropore structure of the material. The porosity, adsorption rate and hydrophilic features of the granules were estimated. Various types of aerobic bench-scale reactors were operated some months. The feed was as well as synthetic substrate as industrial effluents from the manufacturing process of automotive upholstery leather. The reactors were modified with application of a co-substrate dosage of enzymes cross-flow filtration and a wet-oxidation process. The biomass in the reactor was measured finally. Account 50% of volatile matter was fixed by the bio film of the bio carrierAvailable from TU Bergakademie, Freiberg (DE)-FILK gGmbH, under shelf-number:9740 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Wirtschaft BMWi, Bonn (Germany); Projektraeger Gesellschaft fuer Wirtschaftsfoerderung und Marktplanung mbH GEWIPLAN, Berlin (Germany)DEGerman