Home > Articles > Published articles > Kinetic and microbiological characterization of aerobic granules performing partial nitritation of a low-strength wastewater at 10ºC |
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. |
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 |
Post-print 40 p, 2.0 MB |