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Bacterial diversity in the Cr(VI) reducing biocathode of a Microbial Fuel Cell with salt bridge.

Authors
  • Revelo Romo, Dolly Margot1
  • Hurtado Gutiérrez, Nelson Humberto2
  • Ruiz Pazos, Jaime Orlando3
  • Pabón Figueroa, Lizeth Vanessa4
  • Ordóñez Ordóñez, Leidy Alejandra4
  • 1 Biology Department, Universidad de Nariño, Calle 18 Carrera 50, Campus Torobajo, San Juan de Pasto, Nariño, Colombia. Electronic address: [email protected] , (Colombia)
  • 2 Chemistry Department, Universidad de Nariño, Calle 18 Carrera 50, Campus Torobajo, San Juan de Pasto, Nariño, Colombia. , (Colombia)
  • 3 Electrical Engineering Department, Universidad de Nariño, Calle 18 Carrera 50, Campus Torobajo, San Juan de Pasto, Nariño, Colombia. , (Colombia)
  • 4 Biology Department, Universidad de Nariño, Calle 18 Carrera 50, Campus Torobajo, San Juan de Pasto, Nariño, Colombia. , (Colombia)
Type
Published Article
Journal
Revista Argentina de microbiologia
Publication Date
Jan 01, 2019
Volume
51
Issue
2
Pages
110–118
Identifiers
DOI: 10.1016/j.ram.2018.04.005
PMID: 30144991
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Although Cr(VI)-reducing and/or tolerant microorganisms have been investigated, there is no detailed information on the composition of the microbial community of the biocathode microbial fuel cell for Cr(VI) reduction. In this investigation, the bacterial diversity of a biocathode was analyzed using 454 pyrosequencing of the 16S rRNA gene. It was found that most bacteria belonged to phylum Proteobacteria (78.8%), Firmicutes (7.9%), Actinobacteria (6.6%) and Bacteroidetes (5.5%), commonly present in environments contaminated with Cr(VI). The dominance of the genus Pseudomonas (34.87%), followed by the genera Stenotrophomonas (5.8%), Shinella (4%), Papillibacter (3.96%), Brevundimonas (3.91%), Pseudochrobactrum (3.54%), Ochrobactrum (3.49%), Hydrogenophaga (2.88%), Rhodococcus (2.88%), Fluviicola (2.35%), and Alcaligenes (2.3%), was found. It is emphasized that some genera have not previously been associated with Cr(VI) reduction. This biocathode from waters contaminated with tannery effluents was able to remove Cr(VI) (97.83%) in the cathodic chamber. Additionally, through use of anaerobic sludge in the anodic chamber, the removal of 76.6% of organic matter (glucose) from synthetic waste water was achieved. In this study, an efficient biocathode for the reduction of Cr(VI) with future use in bioremediation, was characterized. Copyright © 2018 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L.U. All rights reserved.

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