Traitement des eaux usées dans des bioréacteurs multitrophiques grâce à des flocs de microalgues-bactéries valorisables en biogaz

Abstract : The biological treatment of urban and industrial wastewaters represents a process with a negative impact on the environment and on climate change through the emission of greenhouse gases (GHG), particularly CO2. In the presence of light, microalgae-bacteria flocs (MaB-flocs) have been integrated into photobioreactors with fixed biomass to ensure a sustainable wastewater treatment without O2 supply and CO2 release. The entrapment of flocs in PVA-alginate beads has shown the effect of physicochemical and hydrodynamic conditions on the elimination of pollutants and the multicellularity evolution within multi-scale bioreactors. In addition, the immobilization of biomass on biodegradable olive carriers and on PVC disks provided a better performance of fluidized bed and rotating discs bioreactors, respectively, for the bioremediation of wastewater. The properties of the supports (porosity, roughness, and structure) and the hydrodynamic behaviors have favored the attachment of multitrophic biofilms. Biofilm development shows the effect of multitrophic interactions between microalgae and bacteria on the organic compounds (COD) and nutrients (ammonium and phosphorus) removals. The MaB-flocs biomass was recovered and reused for the treatment of the digestate and to improve the production of biomethane by anaerobic co-digestion. This integrated multitrophic technology makes it possible to obtain zero wastes at the end of the process.
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Olfa Beji. Traitement des eaux usées dans des bioréacteurs multitrophiques grâce à des flocs de microalgues-bactéries valorisables en biogaz. Génie des procédés. Université de Lorraine; Université de Carthage (Tunisie), 2018. Français. ⟨NNT : 2018LORR0289⟩. ⟨tel-02110006⟩

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