Biological water treatment by alternating continuous and...

C - Chemistry – Metallurgy – 02 – F

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C02F 3/30 (2006.01) C02F 3/02 (2006.01)

Patent

CA 2669866

A water treatment method using a biological reactor to break down the nitrogen-based pollution contained in said water, said reactor comprising a biomass aerated by aeration means, said treatment comprising simultaneous nitrification/denitrification phases, characterized in that said treatment implements two aeration modes: a continuous aeration mode; a sequential aeration mode in which the aeration interruption is triggered when the ammonia concentration reaches a low predetermined threshold while the aeration is activated when the ammonia concentration reaches a high predetermined threshold, the switching from one aeration mode to the other being activated according to the nitrate concentration in said water, said continuous aeration mode being activated when said nitrate concentration reaches a low predetermined threshold, and said sequential aeration mode being activated when said nitrate concentration reaches a high predetermined threshold.

L'invention a pour objet un procédé de traitement d'eaux à l'aide d'un réacteur biologique en vue d'abattre la pollution azotée contenue dans lesdites eaux, ledit réacteur intégrant une biomasse aérée par des moyens d'aération, ledit traitement comprenant des phases de nitrifîcation/dénitrifïcation simultanées, caractérisé en ce que ledit traitement met alternativement en AEuvre deux modes d'aération : un mode d'aération dit continu; un mode d'aération séquence au cours duquel l'arrêt de l'aération est déclenché quand la concentration en ammoniaque atteint un seuil bas prédéterminé et le déclenchement de l'aération est déclenché quand la concentration en ammoniaque atteint un seuil haut prédéterminé, le passage d'un mode d'aération à l'autre étant déclenché en fonction de la concentration en nitrates dans lesdites eaux, ledit mode d'aération dit continu étant déclenché lorsque ladite concentration en nitrates atteint un seuil bas prédéterminé, et ledit mode d'aération séquence étant déclenché lorsque ladite concentration en nitrates atteint un seuil haut prédéterminé.

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