Microbial-ecological significance of sulfide precipitation within anaerobic granular sludge revealed by micro-electrodes study

Takashi Yamaguchi, Shinichi Yamazaki, Shigeki Uemura, I. Cheng Tseng, Akiyoshi Ohashi, Hideki Harada

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Micro-electrodes were applied to anaerobic granular sludge, which was developed in a UASB reactor, to examine intra-granule profiles with respect to pH, glucose and sulfide. When glucose was employed as a bulk liquid substrate, the micro-electrodes study demonstrated the pH behavior along granule depth: pH decrement at the granule exterior portion due to acid formation (buildup of acidity), and subsequent pH increment at the granule inner portion due to the consumption of acid (buildup of alkalinity). Sulfide micro-electrode proved sulfate reduction that mostly occurred at the granule exterior portion. Chemical equilibrium consideration evidently explained the occurrence of ferric sulfide predominantly in the interior portion, which accounts well for the morphology of a representative double-layered structure of granules grown on a low level of sulfate. Inorganic elements distribution within anaerobic granule was examined by electron probe X-ray micro analysis (EPMA) and ICP methods. The presence of crystalline calcium carbonate (calcite) was identified by X-ray diffraction analysis.

Original languageEnglish
Pages (from-to)3411-3417
Number of pages7
JournalWater Research
Volume35
Issue number14
DOIs
Publication statusPublished - 2001 Jan 1

Keywords

  • Anaerobic granular sludge
  • Crystalline calcium carbonate
  • Micro-electrodes
  • Microbial-ecology
  • Sulfide precipitation

ASJC Scopus subject areas

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

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