METHOD AND PLANT FOR THE TREATMENT OF EFFLUENTS CONTAINING NITROGEN IN A SEQUENCING BATCH REACTOR 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 substrat e.
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