The effect of free ammonia (NH or FA), free nitrous acid (HNO 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 (NO) and nitrate (NO) generated during oxic phases. The desired NH to NO ratio of 1.3 g N/g N was obtained when an Ammonium Loading Rate (ALR) of 0.09 g NH-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 O/L during the whole operational period. PN mainly occurred caused by the inhibitory effect of FNA on nitrite oxidizing bacteria (NOB). Once HNO concentration was negligible, NH was fully oxidized to NO 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5606105 | PMC |
| http://dx.doi.org/10.1155/2017/6571671 | DOI Listing |
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