Biological nitrogen removal over nitritation/denitritation using phenol as carbon source

Queiroz, Luciano Matos; Aun, Mariana Vivolo; Morita, Dione Mari; Sobrinho, Pedro Além

doi:10.1590/s0104-66322011000200004

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…Fux et al (2006) obtained slightly lower efficiencies of TN removal (85-90 %) in a similar system fed with ethanol as the organic carbon source. Queiroz et al (2011) used phenol as an external carbon source for treating synthetic sludge digester liquors in the process nitritation/denitritation. The removal efficiencies of ammonium nitrogen (NH 4 -N) varied in the range of 89-99 %.…”

Section: Kinetics Of Denitrification During the Acclimation Experimentsmentioning

confidence: 99%

Acclimation of denitrifying activated sludge to a single vs. complex external carbon source during a start-up of sequencing batch reactors treating ammonium-rich anaerobic sludge digester liquors

et al. 2014

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In this study, denitrification of ammonium-reach anaerobic sludge digester liquor was investigated during start-up periods of two laboratory-scale "fill-and-draw" reactors. One reactor was fed with a single carbon source (ethanol), whereas the other reactor was fed with a complex carbon source (fusel oil). During two acclimation experiments, the structure of microbial community involved in denitrification was analyzed using 16S rDNA polymerase chain reaction-denaturing gradient gel electrophoresis fingerprints and fluorescent in situ hybridization. The characteristics of the mixed liquor were additionally supported by regular measurements of nitrate uptake rates. The addition of fusel oil and ethanol resulted in a significant enhancement of the denitrification rate and efficiency combined with the increasing volumetric addition of sludge digester liquor up to 15 % of the reactor volume. The microbiological analyses revealed that the addition of sludge digester liquor as well as both external carbon sources (fusel oil and ethanol) did not affect the structure of microbial communities in a severe way. In both reactors, Curvibacter sp. and Azoarcus sp. were found as the most abundant representatives of denitrifiers.

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Section: Kinetics Of Denitrification During the Acclimation Experimentsmentioning

confidence: 99%

Acclimation of denitrifying activated sludge to a single vs. complex external carbon source during a start-up of sequencing batch reactors treating ammonium-rich anaerobic sludge digester liquors

et al. 2014

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“…In a similar research, aiming at nitrification via nitrite, QUEIROZ et al (2011) worked with an initial free ammonia concentration of approximately 12 mg L −1 , an internal reactor temperature of 35 °C and an initial concentration of ammoniacal nitrogen varying between 200 and 500 mg L −1 . The authors observed that such free ammonia concentration was insufficient to inhibit nitrification, even though within the parameters recommended by the literature.…”

Section: Phase IIImentioning

confidence: 99%

Stability of Partial Nitritation of Poultry Slaughterhouse Wastewater in a Sequential Batch Reactor

et al. 2017

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ABSTRACT:The aim of this study was to monitor the stabilization of a sequential batch reactor (SBR) regarding the partial nitritation of poultry slaughterhouse wastewater, aiming at preparing it for a reactor with bacteria that promote anaerobic ammonia oxidation (anammox). A cylindrical reactor with a useful volume of 3.5 L, mechanical agitation (50 rpm), and suspended biomass was used in the experiment. The strategies adopted for nitrite-oxidizing bacteria (NOB) inhibition were cycle time (CT: 24, 16, 6, 5, 4 h and real-time monitoring), free ammonia accumulation, alkalinity restriction and low concentrations of dissolved oxygen (DO). The ammonification process, observed at all experimental phases, negatively influenced the control of partial nitritation process. Alkalinity restriction under low cycle times (4 and 5 h) conditions, together with low dissolved oxygen concentration, was a key factor for nitrite-oxidizing bacteria inhibition. Stability of partial nitritation was only reached by real-time monitoring, being the cycles stopped when 50% N-NH4 + and 50% N-NO2 − were present in the reactor.

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“…De uma forma geral, a matéria orgânica degradável vai decrescendo em concentração de acordo com a idade do aterro, prevalecendo compostos inertes recalcitrantes, reduzindo desta maneira a razão DBO/DQO (demanda bioquímica de oxigênio/demanda química de oxigênio); sendo por vezes necessária a adição de uma fonte externa de carbono para que o processo de desnitrificação seja realizado completamente (BUTKOVSKYI, 2009;FREITAS, 2009 Ultimamente, tem havido interesse crescente na nitrificação e desnitrificação via nitrito, pois de acordo com o balanço estequiométrico o fornecimento de oxigênio dissolvido para as bactérias autotróficas converterem amônia a nitrito é menor, assim como a quantidade de matéria orgânica doadora de elétrons para a desnitrificação (QUEIROZ et al 2011;ZAFARZADEH et al, 2011). A desnitrificação via nitrito requer um consumo 25% menor de oxigênio dissolvido para a oxidação do nitrogênio amoniacal e 40% menor de fonte de carbono para a desnitrificação do nitrito gerado (SPAGNI; MARSILI-LIBELLI; LAVAGNOLO, 2008 (VON SPERLING, 1997).…”

Section: No Tratamento Biológico O Nitrogênio Amoniacal é Transformadounclassified

Eficiência do melaço como fonte de carbono na remoção de nitrito em lixiviados de aterros sanitários

Zilz

Silva²,

Pinheiro³

2014

Eng. Sanit. Ambient.

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Neste trabalho simulou-se a desnitrificação via nitrito em lixiviado de aterro sanitário, operando-se em escala laboratorial através de um reator em batelada sequencial (RBS) adicionando-se melaço de cana como fonte externa alternativa de carbono. As razões DBOlixiviado+melaço/N-NOx estudadas foram 0,37; 4; 12 e 14 com tempo de reação anóxica de 4,33 h (DBO/N-NOx=0,37; 4 e 14) e 22 h (DBO/N-NOx=12). A taxa específica de desnitritação foi de 0,07 kg nitrito.kg-1 sólidos suspensos voláteis (SSV)*dia após 4,33 h de reação anóxica nos ensaios sem adição de melaço de cana e 0,19 e 0,12 kg nitrito.kg-1 SSV*dia nos ensaios realizados com adição de melaço de cana, fornecendo uma razão DBO/N-NOx de 4 e 14, respectivamente. Ampliando-se o tempo de reação anóxica para 22 h e realizando os ensaios sob razão DBO/N-NOx de 12, a taxa específica de desnitritação foi aumentada para 0,55 kg nitrito.kg-1 SSV*dia.

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Biological nitrogen removal over nitritation/denitritation using phenol as carbon source

Cited by 16 publications

References 10 publications

Acclimation of denitrifying activated sludge to a single vs. complex external carbon source during a start-up of sequencing batch reactors treating ammonium-rich anaerobic sludge digester liquors

Acclimation of denitrifying activated sludge to a single vs. complex external carbon source during a start-up of sequencing batch reactors treating ammonium-rich anaerobic sludge digester liquors

Stability of Partial Nitritation of Poultry Slaughterhouse Wastewater in a Sequential Batch Reactor

Eficiência do melaço como fonte de carbono na remoção de nitrito em lixiviados de aterros sanitários

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