Process for the treatment of waste water containing ammonia

C - Chemistry – Metallurgy – 02 – F

Patent

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

Patent

CA 2338248

A process is described for the biological treatment of waste water containing ammonia, wherein the waste water is treated with sludge containing nitrifying bacteria in an aerated reactor, applying a sludge retention time in the reactor which favours nitrite-producing bacteria over nitrate-producing bacteria. The process is characterised by applying a hydraulic retention time in a continuously operated reactor, which is shorter than the sludge retention time as a result of part of the sludge being separated from the reactor effluent and being returned to the reactor. The performance of the nitrification is further improved by applying low oxygen and nitrite concentrations.

Procédé de traitement biologique d'eaux usées contenant de l'ammoniaque, selon lequel des eaux usées sont traitées à l'aide de boue contenant des bactéries nitrifiantes dans un réacteur aéré et une durée de rétention de boue qui favorise les bactéries produisant du nitrite par rapport à celles produisant du nitrate est appliquée au réacteur. Ledit procédé est caractérisé par l'application à un réacteur à fonctionnement en continu d'une durée de rétention hydraulique qui est plus courte que la durée de rétention de la boue, du fait qu'une partie de la boue est séparée de l'effluent du réacteur et renvoyée vers ledit réacteur. L'effet de nitrification est encore amélioré par l'application de faibles concentrations d'oxygène et de nitrite.

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