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Página principal > Artículos > Artículos publicados > Stable partial nitritation for low-strength wastewater at low temperature in an aerobic granular reactor |
Fecha: | 2015 |
Resumen: | Partial nitritation for a low-strength wastewater at low temperature was stably achieved in an aerobic granular reactor. A bench-scale granular sludge bioreactor was operated in continuous mode treating an influent of 70 mg N-NH₄⁺ L⁻¹ to mimic pretreated municipal nitrogenous wastewater and the temperature was progressively decreased from 30 to 12. 5ºC. A suitable effluent nitrite to ammonium concentrations ratio to a subsequent anammox reactor was maintained stable during 300 days at 12. 5ºC. The average applied nitrogen loading rate at 12. 5 ºC was 0. 7 ± 0. 3 g N L⁻¹ d⁻¹, with an effluent nitrate concentration of only 2. 5 ± 0. 7 mg N--NO₃ L⁻¹. The biomass fraction of nitrite-oxidizing bacteria (NOB) in the granular sludge decreased from 19% to only 1% in 6 months of reactor operation at 12. 5ºC. Nitrobacter spp. where found as the dominant NOB population, whereas Nitrospira spp. were not detected. Simulations indicated that: (i) NOB would only be effectively repressed when their oxygen half-saturation coefficient was higher than that of ammonia-oxidizing bacteria; and (ii) a lower specific growth rate of NOB was maintained at any point in the biofilm (even at 12. 5ºC) due to the bulk ammonium concentration imposed through the control strategy. |
Ayudas: | Ministerio de Economía y Competitividad CTW2011-24745/PPQ Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-815 European Commission 326705 |
Nota: | This study was supported by the AGAUR and ACC1Ó through the ANFIBIO project (2010VALOR0096). J. Pérez acknowledges the mobility fellowship (PRX12/00418, Ministerio de Educación, Cultura y Deporte, through the Programa Nacional de Movilidad de Recursos Humanos del Plan Nacional de I + D + I 2008-2011) provided by the Spanish Government. |
Derechos: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió acceptada per publicar |
Materia: | Mainstream ; NOB repression ; Partial nitritation ; Modeling |
Publicado en: | Water research, Vol. 80 (Sep. 2015) , p. 149-158, ISSN 0043-1354 |
Post-print 36 p, 2.2 MB |