BioMed Research International
BioMed Research International
5 years ago

Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR.

Campos, Guerrero, Vidal, Hsieh, Mosquera-Corral, Belmonte, Méndez
The effect of free ammonia (NH3 or FA), free nitrous acid (HNO2 or FNA), and total alkalinity (TA) on the performance of a partial nitrification (PN) sequencing batch reactor (SBR) treating anaerobically pretreated pig slurry was studied. The SBR was operated under alternating oxic/anoxic (O/A) conditions and was fed during anoxic phases. This strategy allowed using organic matter to partially remove nitrite (NO2(-)) and nitrate (NO3(-)) generated during oxic phases. The desired NH4(+) to NO2(-) ratio of 1.3 g N/g N was obtained when an Ammonium Loading Rate (ALR) of 0.09 g NH4(+)-N/L·d was applied. The system was operated at a solid retention time (SRT) of 15-20 d and dissolved oxygen (DO) levels higher than 3 mg O2/L during the whole operational period. PN mainly occurred caused by the inhibitory effect of FNA on nitrite oxidizing bacteria (NOB). Once HNO2 concentration was negligible, NH4(+) was fully oxidized to NO3(-) in spite of the presence of FA. The use of biomass acclimated to ammonium as inoculum avoided a possible effect of FA on NOB activity.

Publisher URL: http://doi.org/10.1155/2017/6571671

DOI: 10.1155/2017/6571671

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