Importance of the combined effects of dissolved oxygen and pH on optimization of nitrogen removal in anammox-enriched granular sludge

The combined effects of dissolved oxygen (DO) and pH on nitrogen removal were investigated in a laboratory-scale sequencing batch reactor (SBR) with anammox-enriched granular sludge obtained from a nitritation/anammox system. The highest specific nitrogen removal rate (SNRR) (1.1 . This is in contra...

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Detalhes bibliográficos
Autores: Yin, Zhixuan, Diniz dos Santos, Carla Eloísa, Vilaplana, Jaime González, Sobotka, Dominika, Czerwionka, Krzysztof, Damianovic, Márcia Helena Rissato Zamariolli, Xie, Lin, Fernández Morales, Francisco Jesús, Makinia, Jacek
Tipo de documento: artigo
Data de publicação:2016
País:España
Recursos:Universidad de Castilla-La Mancha
Repositório:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/29228
Acesso em linha:http://hdl.handle.net/10578/29228
Access Level:Acceso aberto
Palavra-chave:Ingeniería Química
Anammox
Lodo granulado
Oxígeno disuelto
pH
Remoción de nitrógeno
Nitrificación
Desnitrificación endógena
Descrição
Resumo:The combined effects of dissolved oxygen (DO) and pH on nitrogen removal were investigated in a laboratory-scale sequencing batch reactor (SBR) with anammox-enriched granular sludge obtained from a nitritation/anammox system. The highest specific nitrogen removal rate (SNRR) (1.1 . This is in contrast with the directional DO suppression on nitrogen removal in the anammox process, indicating that other nitrogen conversion pathways, such as nitrification and endogenous denitrification, were also active in the studied reactor. The highest SNRRs were obtained within a pH range of 6.5–8.5, characterized by low concentrations of free ammonia (FA) and free nitrous acid (FNA). Oxygen-consuming bacteria (nitrifiers) were implicitly inhibited by the low pH so that less oxygen was utilized. In tests carried out using the optimum pH physiological range (6.5–8.5) for microorganisms, an explicit DO elbow was observed when the ammonium and nitrite were almost completely removed. This finding confirms the occurrence of nitrogen removal by the oxygen-consuming bacteria in the system studied.

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