Identification of sulfate- And arsenate-reducing bacteria in sheep manure as permeable reactive materials after arsenic immobilization in groundwater

Wahyu Wilopo, Keiko Sasaki, Tsuyoshi Hirajima

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Permeable reactive barriers (PRBs) column tests were performed to investigate the contribution of anaerobic microbial community in sheep manure on the removal of As from groundwater. The column was packed with zero valent iron (ZVI), sheep manure, compost, wood chips, glass beads and gravels. All materials were sterilized except for sheep manure that contains anaerobic bacteria. Decrease in sulfate concentration was observed at the maximum rate of 0.26 mmol dm-3 day-1. In addition, the sulfur isotopic ratio of δ34S increased from the influent (-4.3%o) to the effluent (0.2%o), suggesting that there was sulfate-reducing activity in the microbial community. Arsenate was more effectively immobilized on ZVI than arsenite. Bacterial community analysis using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) on 16S rRNA sequences suggested that majorities of bacteria were several Clostridium species and one species of Proteobacteria, Geobacter metallireducens GS-15, independently of PRBs column heights. Some of them might have contributed to the removal of arsenic.

Original languageEnglish
Pages (from-to)2275-2282
Number of pages8
JournalMaterials Transactions
Volume49
Issue number10
DOIs
Publication statusPublished - Oct 1 2008

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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