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Author |
Belmonte, M.; Hsieh, C.F.; Campos, J.L.; Guerrero, L.; Mendez, R.; Mosquera-Corral, A.; Vidal, G. |
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Title |
Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR |
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2017 |
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Biomed Research International |
Abbreviated Journal |
Biomed Res. Int. |
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7 pp |
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Abstract |
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-) andnitrate (NO3-) generated during oxic phases. The desired NH4+ to NO2- ratioof 1.3gN/gNwas obtained when an Ammonium Loading Rate (ALR) of 0.09 gNH(4)(+)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-2/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 NO(3)(-)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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Address |
[Belmonte, Marisol; Hsieh, Chia-Fang; Vidal, Gladys] Univ Concepcion, Environm Sci Fac, Engn & Environm Biotechnol Grp, POB 160-C, Concepcion, Chile, Email: marisol.belmonte@upla.cl |
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Hindawi Ltd |
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English |
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2314-6133 |
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WOS:000409551200001 |
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UAI @ eduardo.moreno @ |
Serial |
777 |
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