Bau und Betrieb einer grosstechnischen Pilotanlage fuer die anaerobe Reinigung von Fruchtsaftabwaessern Abschlussbericht

For the first time wastewater of the fruit juice industry is anaerobically pretreated in a full scale plant. Among others there were the aims to bring down the concentration of the manufacturing wastewater during the campaign cheap and stable to the level of municipal wastewater, to test the co-fermentation of cooler sludge and kieselguhre as well as the composting of these substrates. -In fact of changed boundary conditions all partial wastewater streams were anaerobically treated the whole year. Results: The anaerobic digestion using a UASB-reactor as methane reactor and a separate acidification has successfully been proved to pretreat the wastewater of the fruit juice industy within and also out of the campaign. Based on lab scale experiments one has to dissuade from the co-fermentation of the sludge-kieselguhre mixture in the UASB-reactor because the pellet structure of the biomass gets lost. In contrast to that composting with a structure material is possible. The sulphur in the wastewater is the main reason for odour problems. Biofilter work sufficiently at a surface flow rate of #<=#20 m/h. Semitechnical tests for exhaust air decontamination in a high rate fixed film biology have been effective at a hydraulic retention time of #>=#1,43 hours. - Running expenses (except of capital costs) were 2,52 DM/m"3 during the first year of operation and 0,99 DM/m"3 during the later routine operation in 1993. (orig.)SIGLEAvailable from TIB Hannover: F96B1180+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman