Nitrate removal in a combined bioelectrochemical and sulfur autotrophic denitrification system under high nitrate concentration: effects of pH

Nitrate removal in a combined bioelectrochemical and sulfur autotrophic denitrification system... A combined bioelectrochemical and sulfur autotrophic denitrification (CBSAD) system was established to treat high concentration nitrate under different pH conditions in this study. The microbial communities and structures were evaluated to deeply reveal the nitrate removal mechanisms in this combined system. When initial pH was adjusted to 6.5, the CBSAD system obtained 66.45% denitrification efficiency. The combined system achieved highest nitrate removal efficiency of 96.84% at pH 7.5. However, nitrate removal efficiency decreased to 87.05% when initial pH increased to 8.5. Microbial analyses demonstrated that pH value slightly influenced the bacterial abundances and bacterial species in this CBSAD system under high nitrate concentration condition. Proteobacteria was the most dominant phylum in this system, which accounted for more than 90% of the total phyla. Epsilonproteobacteria, Betaproteobacteria, and Gammaproteobacteria were the most important classes for denitrification process. Genus Sulfurimonas was primarily responsible for high nitrate removal in this CBSAD system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bioprocess and Biosystems Engineering Springer Journals

Nitrate removal in a combined bioelectrochemical and sulfur autotrophic denitrification system under high nitrate concentration: effects of pH

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Chemistry; Biotechnology; Industrial and Production Engineering; Environmental Engineering/Biotechnology; Industrial Chemistry/Chemical Engineering; Food Science
ISSN
1615-7591
eISSN
1615-7605
D.O.I.
10.1007/s00449-017-1879-7
Publisher site
See Article on Publisher Site

Abstract

A combined bioelectrochemical and sulfur autotrophic denitrification (CBSAD) system was established to treat high concentration nitrate under different pH conditions in this study. The microbial communities and structures were evaluated to deeply reveal the nitrate removal mechanisms in this combined system. When initial pH was adjusted to 6.5, the CBSAD system obtained 66.45% denitrification efficiency. The combined system achieved highest nitrate removal efficiency of 96.84% at pH 7.5. However, nitrate removal efficiency decreased to 87.05% when initial pH increased to 8.5. Microbial analyses demonstrated that pH value slightly influenced the bacterial abundances and bacterial species in this CBSAD system under high nitrate concentration condition. Proteobacteria was the most dominant phylum in this system, which accounted for more than 90% of the total phyla. Epsilonproteobacteria, Betaproteobacteria, and Gammaproteobacteria were the most important classes for denitrification process. Genus Sulfurimonas was primarily responsible for high nitrate removal in this CBSAD system.

Journal

Bioprocess and Biosystems EngineeringSpringer Journals

Published: Dec 16, 2017

References

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