Integrated multi-zone wastewater treatment system and method

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/30 (2006.01) C02F 1/00 (2006.01) C02F 9/00 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2583752

A wastewater treatment system has two separate but interlinked tanks containing four different zones, namely aerobic, microaerophilic, anoxic and anaerobic, for the biological treatment of the wastewater, as well as two clarification zones and a filtration unit for separation of solids from liquid. The first tank contains the aerobic, microaerophilic and anoxic zone as well as a clarification zone, while the second dank includes the anaerobic zone, a solid-liquid separation zone and a filtration unit. The aerobic zone is an airlift reactor that contains air diffusers at the bottom of the zone to introduce air into the zone. The air bubbles mix the liquid and its content of microorganisms, and provide oxygen for the aerobic biological processes that take place in this zone. Aeration also produces circulation of liquid between the aerobic zone and its adjacent microaerophilic and anoxic zones that are located at the sides and under the aerobic zone, respectively. The aerobic zone contains suspended microorganisms of heterotrophic and autotrophic groups that grow inside the circulating liquid, known as mixed liquor. Within the volume of the aerobic zone, loose carrier material or stationary objects are disposed to support the attachment of microbial biomass and the formation of microbial biofilm.

L'invention concerne un système de traitement d'eaux usées qui comporte deux réservoirs séparés mais reliés contenant quatre zones différentes, de traitement aérobie, microaérophile, anoxique et anaérobie, pour le traitement biologique d'eaux usées, et deux zones de clarification et une unité de filtration pour la séparation solide-liquide. Le premier réservoir comporte les zones aérobie, microaérophile, anoxique et une zone de clarification, et le second réservoir comprend la zone anaérobie, une zone de séparation solide-liquide et une unité de filtration. La zone aérobie est un réacteur à agitation pneumatique qui contient des diffuseurs d'air en fond de zone pour l'introduction d'air dans la zone. Les bulles d'air mélangent le liquide et son contenu de micro-organismes et fournissent l'oxygène aux processus biologiques intervenant dans la zone. En outre, l'aération entraîne une circulation de liquide entre cette zone aérobie et ses zones microaérophile et anoxique adjacentes, qui se trouvent sur les côtés de la zone aérobie et sous elle, respectivement. La zone aérobie contient des micro-organismes en suspension de groupes hétérotrophes et autotrophes se développant dans le liquide en circulation, que l'on appelle liqueur mixte. Le volume de la zone aérobie contient du matériau support libre ou des objets stationnaires servant de supports à la fixation de biomasse microbienne et à la formation de biofilm microbien.

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