Description: Das Projekt "Fixed Biomass Municipal Sewage Treatment Application to Treatment of Industrial Wastewater Containing Recalcitrant Compounds" wird/wurde gefördert durch: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung. Es wird/wurde ausgeführt durch: Ecole Polytechnique Federale de Lausanne, Institut de Genie de l'Environnement, Laboratoire de Biotechnologie Environnementale.The aim of the project was to test whether the Biological Filtration Oxygenated Reactor BIOFOR (R) (Degremont) process, originally developed for municipal wastewater treatment, can be applied to treat industrial effluents containing recalcitrant compounds. For this purpose, a pilot plant of two biofilters (0,57 m3 each) of Degremont SA was set up at the wastewater treatment plant of Firmenich SA, a fine chemical industry. Before inoculation, the hydrodynamic behaviour of the biofilter was studied for parameters concerning the pressure drop, the gas and liquid hold-up, the mean residence time and the dispersion coefficient. Oxygen mass transfer coefficient has been determined with an adaptation of the cuprous chloride oxidation method. Pressure drop correlation using macroporosity with liquid and gas velocities (Reynolds numbers) has been determined to follow the biofilm growth on the carrier. The dynamic model of BIOFOR (R) operation has been preliminarily identified. The use of parameters (mass transfer, biokinetic) has allowed to predict correctly the bioreactor operation for organic bad between 2 and 6 kg of Total Organic Carbon (TOC) m -3 d-1. Thus the optimal organic bad corresponding to the maximum substrate removal yield can be theoretically and experimentally calculated. Its value was 3.5 kg TOC m-3 d -1, for industrial effluent with TOC concentration varying between 40 and 300 mg l-1. The experimental study of optimal operating conditions has shown that the operation of two bioreactors in series is beneficial at high organic loads up to 6 COT m-3 d-1 but increase removal efficiency for only 3 percent for medium organic loads. On the other hand, experiments using one column with recycling showed a yield increase from 89 to 85 percent when recycling ratio was varied between 0 and 11. The theoretical and experimental approaches developed in this study are contributions to the efficient use of BIOFOR (R). The techniques used for hydrodynamic and mass transfer characterization can be adapted to other biofilters operating with cocurrent upflow of air and effluent. The results obtained also confirm the BIOFOR (R) potential in industrial wastewater treatment.^Les procedes a biomasse immobilisee, en particulier le procede BIOFOR de la Societe Degremont, ont ete developpes en priorite pour le traitement biologique des eaux residuaires urbaines. Leur transposition, de meme que leur controle et conduite rationnelle sur des effluents industriels contenant des composes xenobiotiques pose de nombreux problemes dont la solution doit etre recherchee pour une epuration biologique efficace de ces projet est de rechercher, par la realisation d'un modele de representation hydrodynamique et biologique, les conditions de fonctionnement optimal du procede BIOFOR sur des effluents industriels, partant des acquis de connaissances de ce procede sur des eaux residuaires urbaines. L'etude experimentale est realisee sur une installation pilote sur des effluents industriels reels englobant les aspects hydrodynamiques, de transferts de masse et les cinetiques biologiques du biosysteme immobilise. (FRA)
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Hydrodynamik ? Biologische Abwasserbehandlung ? Biologische Abwasserreinigung ? Chemische Industrie ? Resistenz ? Biofiltration ? Abwasserbehandlung ? Abwasserbehandlungsanlage ? Betriebsdaten ? Biofilm ? Bioreaktor ? Festbettreaktor ? Industrieabwasser ? Recyclingquote ? Kommunales Abwasser ? Gesamter organischer Kohlenstoff ? Biologischer Abbau ? Abbaubarkeit ? Abwasser ? Biosystem ? Dispersion ? Filtration ? Reinigungsleistung ? Schadstoffimmobilisierung ? Studie ? Verfahrenstechnik ? Wirtschaftlichkeit ? Biomasse ? Kenngröße ? Versuchsanlage ? Anlagenbetrieb ? BIOFOR ? Anlagengröße ? Oxygen-mass-transfer-coefficient ? Betriebsparameter ? Biological-Filtration-Oxygenated-Reactor ? Biologisches Verfahren ? Dispersionskoeffizient ?
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 1993-02-03 - 1997-02-01
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