Method for evaluating and controlling the biomass contained...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/12 (2006.01) G05D 21/02 (2006.01) G01N 21/35 (2006.01) G01N 27/48 (2006.01)

Patent

CA 2305490

The invention concerns a method characterised in that it uses the stop/start sequences of the aeration system of the treatment basins, imposed by the treating process, to estimate the biomass respiration, the latter being measured during the non-aeration phases, according to the following steps: determining the dissolved oxygen concentration, the evolution of the amount of oxygen contained in the aeration tank, that is its decrease according to the purifying biomass respiration activity; determining the amount of oxygen coming out of the aeration tank, the amount of oxygen entering the tank during a non-aeration phase being considered as nil; determining, on the basis of the data collected during the above steps the purifying biomass respiratory capacity; determining the mass of suspended matters in the purifying biomass and computing, on the basis of the biomass respiratory capacity and the sludge concentration, the amount of oxygen consumed per mass unit of biological sludge and per time unit, that is, the purifying biomass specific respiratory activity.

Ce procédé est caractérisé en ce qu'il utilise les séquences de marche/arrêt du système d'aération des bassins de traitement, imposées par la conduite du processus de traitement, pour estimer la respiration de la biomasse, celle-ci étant mesurée au cours des phases de non-aération, selon les étapes suivantes: détermination de la concentration en oxygène dissous, de l'évolution de la quantité d'oxygène contenue dans le bassin d'aération, c'est-à-dire de sa diminution en fonction de l'activité respiratoire de la biomasse épurante; détermination de la quantité d'oxygène sortant du bassin d'aération, la quantité d'oxygène entrant dans le bassin au cours de la phase de non-aération étant considérée comme nulle; détermination, à partir des informations recueillies lors des étapes ci-dessus de la capacité respiratoire de la biomasse épurante; détermination de la masse de matières en suspension dans la biomasse épurante et calcul, à partir de la capacité respiratoire de la biomasse et de la concentration en boues, de la quantité d'oxygène consommée par unité de masse de boue biologique et par unité de temps, c'est-à-dire de l'activité respiratoire spécifique de la biomasse épurante.

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