Nitrification processes are well known for certain problems in connection with transient build-up of nitrite ions. Moreover, some works have shown interest in controlling the build-up of this ion, particularly when treatment procedures for nitrogenous pollution are of the nitritation-denitritation type. With this in mind, we have carried out a programme of research to check the main factors responsible for the accumulation of this ion, i.e. [NH4]o, T°, pH, and dissolved O2. The main results highlight the key role played by the free form N-NH3 and by the temperature. This research thus provides answers to a number of practical questions and allows us to envisage setting up new procedures for the treatment of nitrogenous pollution by fixed cultures.

You do not currently have access to this content.