System for removing nutrients from wastewater

Details System for removing nutrients from wastewater System for removing nutrients from wastewater

C - Chemistry, Metallurgy

02

F

C02F 3/30 (2006.01)

Patent

CA 2244108

A wastewater treatment system mixes return activated sludge with influent wastewater under anoxic conditions (42) in the presence of luxury uptake microorganisms to cause release of phosphorous compounds into the wastewater. The wastewater is then aerated (44) in the presence of nitrifying microorganisms to convert ammonia into nitrate while the luxury uptake microorganisms take up the phosphorous compounds. The wastewater is then subjected to alternating anoxic and oxic conditions (46a, 46b) to reduce the nitrate to nitrogen gas using denitrifying microorganisms. The resulting effluent is substantially free of nitrogen based and phosphorous based nutrients.

Système de traitement d'eaux usées mélangeant une boue activée avec des eaux usées de pénétration dans des conditions anoxiques (42) en présence de micro-organismes de consommation de luxe, afin de produire un dégagement de composés phosphoreux dans les eaux usées. Les eaux usées sont ensuite aérées (44) en présence de micro-organismes nitrifiants pour convertir l'ammoniac en nitrate, alors que les micro-organismes de consommation de luxe consomment les composé phosphoreux. Les eaux usées sont ensuite soumises alternativement à des conditions anoxiques et oxiques (46a, 46b) en vue de réduire le nitrate en azote à l'aide de micro-organismes de dénitrification. L'effluent résultant est sensiblement dépourvu de nutriments azotés et phosphoreux.

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