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

Author:

Belmonte Marisol123ORCID,Hsieh Chia-Fang1,Campos José Luis4ORCID,Guerrero Lorna5,Méndez Ramón6,Mosquera-Corral Anuska6,Vidal Gladys1

Affiliation:

1. Engineering and Environmental Biotechnology Group, Environmental Science Faculty & Center EULA-Chile, University of Concepción, P.O. Box 160-C, Concepción, Chile

2. School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, 2362803 Valparaíso, Chile

3. Laboratory of Biotechnology, Environment and Engineering, Faculty of Engineering, University of Playa Ancha, 2340000 Valparaíso, Chile

4. Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, 2503500 Viña del Mar, Chile

5. Department of Chemical and Environmental Engineering, University Federico Santa María, 2390123 Valparaíso, Chile

6. Department of Chemical Engineering, School of Engineering, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain

Abstract

The effect of free ammonia (NH3or FA), free nitrous acid (HNO2or 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 desiredNH4+toNO2-ratio of 1.3 g N/g N was obtained when an Ammonium Loading Rate (ALR) of 0.09 gNH4+-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 HNO2concentration was negligible,NH4+was fully oxidized toNO3-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.

Funder

CONICYT/FONDECYT

Publisher

Hindawi Limited

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine

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