Ammonia oxidizing bacteria: are they different in nitrifying bio-augmentation products than in activated sludge?
Ammonia oxidizing bacteria : sont-elles différentes dans les produits de bio-augmentation et dans les boues activées ?
Résumé
To restore wastewater treatment plant (WWTP) performances after loosing nitrifying activity, commercial solutions of nitrifying bacteria, called Nitrifying Bio-augmentation Products (NBP), can be added in low loaded (i.e. nitrifying) activated sludge plants. Autochthon ammonia oxidizing bacteria (AOB) populations were compared to a specific NBP through 16S rDNA sequences discrimination using DGGE and SSCP techniques. Seasonal stability of WWTP AOB communities was also investigated.