There is no work reporting the simultaneous oxidation of p-hydroxybenzaldehyde and ammonium in nitrifying reactors.

Up to 200 mg p-hydroxybenzaldehyde-C/Ld, the nitrifying respiratory process was stable with high ammonium conversion into nitrate.

The use of a sequencing batch reactor allowed the metabolic adaptation of the sludge to oxidize p-hydroxybenzaldehyde and p-hydroxybenzoate.

By controlling the culture conditions, the microbial growth was limited and the catabolic pathway was favored (nitrate formation).

The nitrifying consortium physiologically stable was able to perform various biological respiratory processes in a unique reactor.