The behavior of sulfate-reducing bacteria in acidogenic phase of anaerobic digestion

O. Mizuno, Y. Y. Li, T. Noike

Research output: Contribution to journalArticlepeer-review

124 Citations (Scopus)

Abstract

The effect of sulfate reduction on the acidogenic phase was investigated using anaerobic chemostat systems at 35°C. Sucrose (10,000 mg COD/l) was used as the sole organic substrate. Chemostat systems were maintained at hydraulic retention times (HRTs) of 2, 4, 6, 8 and 10 h. The sulfate concentration in the substrate was increased to 0 (control), 600, 1200 and 2400 mg/l. Sulfate reduction occurred even at an HRT of 2 h, while the hydrogen production rate evidently decreased with increasing sulfate concentration at HRTs of 2 and 4 h. Hydrogen was a key electron donor for the sulfate-reducing bacteria (SRB). The sulfate removal efficiencies were over 90% at sulfate concentrations of 600 and 1200 mg/l at HRTs of longer than 8 h. No inhibition in the degradation of sucrose was observed although the free-H2S concentration was up to 99 mg S/l. Hydrogen-consuming and lactate-consuming SRB were maximally enumerated at 108 and 109 MPN/ml at a sulfate concentration of 2400 mg/l and an HRT of 2 h. The SRB were enumerated at 105 to 107 MPN/ml even in the absence of sulfate. The results of this study showed that SRB could grow under acidogenic condition, and almost sulfate could be removed in the acidogenic phase.

Original languageEnglish
Pages (from-to)1626-1634
Number of pages9
JournalWater Research
Volume32
Issue number5
DOIs
Publication statusPublished - 1998 Mar 1
Externally publishedYes

Keywords

  • Acidogenic phase
  • Anaerobic treatment
  • Bacterial population
  • Competition
  • Hydrogen
  • Sucrose
  • Sulfate removal
  • Sulfate-reducing bacteria
  • Sulfide

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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