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Kinetic and microbiological characterization of aerobic granules performing partial nitritation of a low-strength wastewater at 10ºC
Reino, Clara (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Suárez Ojeda, María Eugenia (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Pérez Cañestro, Julio (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Carrera, Julian (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Date: 2016
Abstract: A granular airlift reactor enriched in ammonia oxidizing bacteria (AOB) was operated at 10 °C performing stable partial nitritation in the long-term. The reactor treated a synthetic low-strength influent during 250 days with an average nitrogen loading rate of 0. 63 ± 0. 06 g N L⁻¹ d⁻¹. Nitrate production was barely detected, being the average concentration in the effluent of 0. 6 ± 0. 3 mg N-NO3 L⁻¹. Furthermore, a suitable effluent for a subsequent reactor performing the anammox process was achieved. A maximum specific growth rate as high as 0. 63 ± 0. 05 d⁻¹ was determined by performing kinetic experiments with the granular sludge in a chemostat and fitting the results to the Monod model. Pyrosequencing analysis showed a high enrichment in AOB (41 and 65% of the population were identified as Nitrosomonas genus on day 98 and 233, respectively) and an effective repression of nitrite oxidizing bacteria in the long-term. Pyrosequencing analysis also identified the coexistence of nitrifying bacteria and heterotrophic psychrotolerant microorganisms in the granular sludge. Some psychrotolerant microorganisms are producers of cryoprotective extracellular polymeric substances that could explain the better survival of the whole consortia at cold temperatures.
Grants: European Commission 326705
Ministerio de Economía y Competitividad CTQ2014-60495-R
Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1255
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, 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. Creative Commons
Language: Anglès
Document: Article ; recerca ; Versió acceptada per publicar
Subject: Partial nitritation ; Mainstream ; Low temperature ; NOB-Repression ; AOB-Enrichment ; Anammox
Published in: Water research, Vol. 101, (Sep. 2016) , p. 147-156, ISSN 0043-1354

DOI: 10.1016/j.watres.2016.05.059


Post-print
40 p, 2.0 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Engineering > GENOCOV
Articles > Research articles
Articles > Published articles

 Record created 2016-10-25, last modified 2022-01-10



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