Method and plant for the treatment of effluents containing...

C - Chemistry – Metallurgy – 02 – F

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C02F 3/30 (2006.01) C02F 3/00 (2006.01) C02F 9/14 (2006.01)

Patent

CA 2701786

Method for the treatment of effluents containing nitrogen in the form of ammonium, according to which: a volume of effluent to be treated in a complete cycle is introduced into the batch reactor in successive volume fractions, each volume fraction being treated during a subcycle: each subcycle comprises a phase of feeding with a volume fraction and, in an alternating manner, two treatment stages, i.e. an aerated first stage, during which complete or partial oxidation of the ammonium so as to give nitrites takes place, followed by a nonaerated second stage, during which the nitrites produced and the ammonium are converted to nitrogen gas. During the aerated first stage, the dissolved oxygen concentration in the batch reactor is maintained between 0.1 mgO2/l and 0.6 mgO2/l; the N-NO2: N-NH4 ratio is adjusted so as to be between 0.9 and 1.5 at the beginning of the nonaerated stage; and the nonaerated phase is carried out by deammonification, without the provision of carbon-based substrate.

Procédé de traitement d'effluents contenant de l'azote sous forme d'ammonium, selon lequel : un volume d'effluent à traiter dans un cycle complet est introduit par fractions volumiques successives dans le réacteur biologique, chaque fraction volumique étant traitée auu cours d'un sous-cycle : chaque sous-cycle comprend une phase d'alimentation par une fraction volumique et, de manière alternée, deux étapes de traitement, à savoir, une première étapte aérée, au cours de laquelle a lieu une oxydation totale ou partielle de l'ammonium en nitrites, suivie d'une deuxième étape non aérée au cours de laquelle les nitrites produits et l'ammonium sont convertis en azote gazeux. Pendant la première étape aérée, la concentration en oxygène dissous dans le réacteur biologique est maintenue entre 0.1 mg02/L et 0.6 mgO2/L; le rapport N-NO2 : N-NH4 est ajusté pour être compris entre 0.9 et 1.5 au début de l'étape non aérée; et la phase non aérée est réalisée par déammonification, sans apport de substrat carboné.

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