Effect of sulfide concentration on autotrophic denitrification from nitrate and nitrite in vertical fixed-bed reactors


Autoria(s): Moraes, Bruna de Souza; Souza, T. S. O.; Foresti, Eugenio
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

05/11/2013

05/11/2013

2012

Resumo

Autotrophic denitrification coupled with sulfide oxidation represents an interesting alternative for the simultaneous removal of nitrate/nitrite and sulfide from wastewaters. The applicability of such bioprocess is especially advantageous for the post treatment of effluents from anaerobic reactors, since they usually produce sulfides, which can be used as endogenous electron donor for autotrophic denitrification. This study evaluated the effect of sulfide concentration on this bioprocess using nitrate and nitrite as electron acceptors in vertical fixed-bed reactors. The results showed that intermediary sulfur compounds were mainly produced when excess of electron donor was applied, which was more evident when nitrate was used. Visual evidences suggested that elemental sulfur was the intermediary compound produced. There was also evidence that the elemental sulfur previously formed was being used when sulfide was applied in stoichiometric concentration relative to nitrate/nitrite. Nitrite was more readily consumed than nitrate. For both electron acceptors and sulfide concentrations tested, autotrophic denitrification was not affected by residual heterotrophic denitrification via endogenic activity, occurring as a minor additional nitrogen removal process. (C) 2012 Elsevier Ltd. All rights reserved.

FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)

CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)

Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

Identificador

PROCESS BIOCHEMISTRY, OXFORD, v. 47, n. 9, pp. 1395-1401, SEP, 2012

1359-5113

http://www.producao.usp.br/handle/BDPI/41269

10.1016/j.procbio.2012.05.008

http://dx.doi.org/10.1016/j.procbio.2012.05.008

Idioma(s)

eng

Publicador

ELSEVIER SCI LTD

OXFORD

Relação

PROCESS BIOCHEMISTRY

Direitos

closedAccess

Copyright ELSEVIER SCI LTD

Palavras-Chave #AUTOTROPHIC DENITRIFICATION #NITRATE #NITRITE #SULFIDE #INTERMEDIARY SULFUR COMPOUNDS #DENITRIFYING CONDITIONS #ELECTRON-ACCEPTOR #OXIDATION #BIOOXIDATION #REMOVAL #SULFUR #NITROGEN #PHENOL #BATCH #BIOCHEMISTRY & MOLECULAR BIOLOGY #BIOTECHNOLOGY & APPLIED MICROBIOLOGY #ENGINEERING, CHEMICAL
Tipo

article

original article

publishedVersion