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World Journal of Microbiology and Biotechnology

, Volume 28, Issue 2, pp 677–686 | Cite as

Genus-specific and phase-dependent effects of nitrate on a sulfate-reducing bacterial community as revealed by dsrB-based DGGE analyses of wastewater reactors

  • Kouhei MizunoEmail author
  • Yui Morishita
  • Akiko Ando
  • Naofumi Tsuchiya
  • Mai Hirata
  • Kenji Tanaka
Original Paper

Abstract

The biogenic production of hydrogen sulfide is a serious problem associated with wastewater treatment. The aim of this study was to investigate the inhibitory effect of nitrate on the dynamics of sulfate-reducing bacteria (SRB) community in a laboratory-scale wastewater reactor, originating from a denitrifying plant using activated sludge. For this purpose, denaturing gradient gel electrophoresis (DGGE) analysis targeting the dsrB (dissimilatory sulfite reductase) gene was used in combination with chemical analyses and measurement of oxidation and reduction potential (ORP). The reactors were initially dosed with 1.0 and 4.0 g/L potassium nitrate and anaerobically incubated for 490 h. Addition of 4.0 g/L nitrate to the reactor was associated with a prolonged inhibition (over 300 h, i.e., 12.5 days) of sulfate reduction and this was consistent with a rapid decrease in ORP associated with nitrate depletion. The DGGE analysis revealed that nitrate addition remarkably attenuated a distinct group of dsrB related to Desulfovibrio, whereas other dsrB groups were not influenced. Furthermore, another sulfate reduction by Syntrophobacter in the later stages of the incubation period occurred in both reactors (regardless of the nitrate concentration), suggesting that different SRB groups are associated with sulfate reduction at different stages of the wastewater treatment process.

Keywords

Sulfate-reducing bacteria Desulfovibrio Bacterial community dynamics Activated sludge Dissimilatory sulfite reductase 

Abbreviations

SRB

Sulfate-reducing bacteria

ORP

Oxidation and reduction potential

DGGE

Denaturing gradient gel electrophoresis

PCR

Polymerase chain reaction

COD

Chemical oxygen demand

SDS

Sodium dodecyl sulfate

Notes

Acknowledgments

We thank the staff of the wastewater facility for their help with sample collection. We also thank Dr. Ryuji Kondo, Fukui Prefectural University, for providing helpful discussions relating to the work.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Kouhei Mizuno
    • 1
    Email author
  • Yui Morishita
    • 1
  • Akiko Ando
    • 2
  • Naofumi Tsuchiya
    • 3
  • Mai Hirata
    • 4
  • Kenji Tanaka
    • 4
  1. 1.Department of Materials Science and Chemical EngineeringKitakyushu National College of TechnologyKitakyushuJapan
  2. 2.Practical Biotechnology Group, Bioresources Research Center, Research LaboratoryKyushu Electric Power Co., Inc.Saga-shiJapan
  3. 3.Enviroment DepartmentKyuden Sangyo Co., Inc.Higashi-ku, Fukuoka-shiJapan
  4. 4.Department of Biological and Environmental Chemistry, School of Humanity-Oriented Science and EngineeringKinki UniversityIizuka-shiJapan

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