Effective selenium volatilization under aerobic conditions and recovery from the aqueous phase by Pseudomonas stutzeri NT-I

Tsubasa Kagami, Takanobu Narita, Masashi Kuroda, Emi Notaguchi, Mitsuo Yamashita, Kazunari Sei, Satoshi Soda, Michihiko Ike

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Selenium is an important rare metal and its recovery from waste and wastewater is necessary for its sustainable utilization. Microbial selenium volatilization is suitable for selenium recovery from industrial wastewater because volatile selenium can be recovered in recyclable forms free from other chemicals. We found that Pseudomonas stutzeri NT-I can aerobically transform selenate, selenite, and biogenic elemental selenium into dimethyldiselenide as well as dimethylselenide; these were temporarily accumulated in the aqueous phase and then transferred into the gaseous phase. The rate of selenium volatilization using strain NT-I ranged 6.5-7.6 μmol/L/h in flask experiments and was much higher than the rates reported previously for other microbes. The selenium volatilization rate accelerated to 14 μmol/L/h in a jar fermenter. Furthermore, 82% of the selenium volatilized using strain NT-I was recovered with few impurities within 48 h in a simple gas trap with nitric acid, demonstrating that strain NT-I is a promising biocatalyst for selenium recovery through biovolatilization from the aqueous phase.

Original languageEnglish
Pages (from-to)1361-1368
Number of pages8
JournalWater Research
Volume47
Issue number3
DOIs
Publication statusPublished - 2013 Mar 1

Keywords

  • Pseudomonas stutzeri
  • Resource recovery
  • Selenium
  • Volatilization
  • Water treatment

ASJC Scopus subject areas

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

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