Method for controlling oxygen supply for treating...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 3/00 (2006.01) C02F 3/12 (2006.01) C02F 3/30 (2006.01)

Patent

CA 2754873

The invention relates to a method for controlling oxygen supply in a tank (2) for biologically treating wastewater by alternating aeration including consecutive cycles, wherein each cycle comprises a first aeration phase and a second anoxic phase for reducing nitrites and nitrates formed during the preceding aeration phase, the tank is provided with sensors for measuring ammonia nitrogen (4b) and for measuring nitrate (4c) and optionally for measuring oxygen (4a) that is dissolved in the tank liquor or in the liquor thereof exiting the tank, a method according to which the oxygen supply is controlled in the aeration phase when the reduction speed of the nitrate measurement is less than a bottom threshold and the cutoff of the oxygen supply is also controlled in the aeration phase when at least one of the following triggering events occurs: the reduction speed in the measurement of ammonia nitrogen becomes lower than a bottom threshold; the total sum of ammonia nitrogen and nitrate measurements becomes higher than a top threshold, said thresholds may be dependent on time delays and on a top threshold for the dissolved oxygen measurement.

Procédé de régulation de rapport d'oxygène dans un bassin (2) de traitement biologique d'eau résiduaire par aération alternée comprenant des cycles successifs, chaque cycle comportant une première phase d'aération et une seconde phase anoxique pour la réduction des nitrites et des nitrates formés pendant la phase d'aération précédente, le bassin étant équipé de capteurs de mesure de l'azote ammoniacal (4b), et de mesure de nitrate (4c) et éventuellement de mesure d'oxygène dissous (4a) dans la liqueur du bassin ou dans Sa liqueur qui sort du bassin, procédé selon lequel on commande l'apport d'oxygène de la phase d'aération lorsque la vitesse de diminution de la mesure de nitrate est inférieure à un seuil bas et on commande également l'arrêt d'apport d'oxygène de la phase d'aération lorsque l'un au moins des événements déclencheurs suivants se produit : la vitesse de diminution de la mesure d'azote ammoniacal devient inférieure à un seuil bas; Sa somme des mesures d'azote ammoniacal et de nitrate devient supérieure à un seuil haut, ces seuils pouvant être conditionnés par des temporisations et par un seuil haut de la mesure d'oxygène dissous.

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