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Résumé Résumé Le traitement biologique des eaux usées urbaines et industrielles reste une activité ayant un impact négatif sur l'environnement et sur le changement climatique par l'émission des gaz à effet de serre (GES), notamment le CO2. Les changements innovants au niveau des procédés de traitement des eaux usées par l'intégration des flocs de microalgues-bactéries ont abouti à des procédés multitrophiques sans apport d'O2 et sans dégagement du CO2. Il s'agit d'une étude de faisabilité de ces flocs-MaB pour la photobioremédiation des polluants (organiques et minéraux) et pour la production de biomasse valorisable en bioénergie dans le cadre de l'économie circulaire, En présence de la lumière, les flocs-MaB ont été intégrés dans des photobioréacteurs à biomasse fixe afin d'assurer un traitement durable des eaux usées grâce aux échanges symbiotiques entre les micro-oragnismes en terme de nutriments et de gaz, vol.50, pp.83-89, 2010. ,
, Par ailleurs, la biomasse multitrophique immobilisée sur des supports biodégradables d'olive (OPP) et sur des disques en Plexiglace a assuré une meilleure performance des bioréacteurs à lit fluidisé et à disques rotatifs, respectivement, pour la bioremédiation des eaux usées. Les propriétés des supports (porosité, rugosité et structure) et les comportements hydrodynamiques ont été contrôlés pour favoriser l'attachement des biofilms multitrophiques. Le développement de biofilm montre l'effet des interactions multitrophiques entre les microalgues et les bactéries sur l, L'encapsulation des flocs-MaB dans des billes de PVA-alginate a montré l'effet des conditions physico-chimiques et hydrodynamiques sur l'élimination des polluants et l'évolution multicellulaire des flocs au sein des réacteurs à multi-échelles
, Mots clés: Flocs de microalgues-bactéries, bioréacteurs multitrophiques, interactions symbiotiques, support biodégradables, économie circulaire, encapsulation, approche multiéchelle