Multistage facultative wastewater treatment system

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/30 (2006.01) C02F 3/12 (2006.01)

Patent

CA 2332530

A treatment system for wastewater having a tank with a vertically disposed lower anaerobic treatment zone (21), a middle microaerophilic treatment zone (22) and an upper aerobic treatment zone (23). A baffle (101) extends vertically in the tank to define an influent section (1) and an effluent section (E). The heavier biosolids drop to the lower anaerobic zone and the lighter components rise through the effluent section through the microaerophilic and aerobic sections. A lift tube (91) lifts liquid and lighter solid components back into the influent section.

L'invention concerne un système de traitement des eaux usées qui comprend un réservoir incluant une zone de traitement anaérobie inférieure verticale (21), une zone de traitement microaérophile médiane (22) et une zone de traitement aérobie supérieure (23). Une cloison séparative (101) s'étendant verticalement dans le réservoir délimite une partie influente (I) et une partie effluente (E). Les matières solides biodégradables plus lourdes descendent dans la zone anaérobie inférieure et les matières plus légères remontent vers la partie effluente à travers les zones microaérophile et anaérobie. Un tube élévateur (91) fait remonter le liquide et les matières solides plus légères vers la partie influente.

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