BIOLOGICAL WATER TREATMENT BY ALTERNATING CONTINUOUS AND SEQUENTIAL AERATION

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.