Investigation of selenium recovery on oxidizing roasting of "Bio-Selenium"

Osamu Otsuka, Yutaka Yanaba, Takeshi Yoshikawa, Mitsuo Yamashita

Research output: Contribution to journalArticle

Abstract

We have developed a method for recycling selenium from Se-containing wastewater using the selenium-oxyanion-reducing aerobic bacterium Pseudomonas stutzeri NT-1. The treatment of Se-containing wastewater with the NT-I strain provided bio-selenium, which is mainly composed of organic matter and 11-14 mass% of Se. In the present study, we investigated the recovery of Se from bio-selenium by oxidizing roasting and chemical reduction. After thermodynamic calculations were performed to estimate the oxidation behavior during the roasting process, roasting experiments were conducted on bio-selenium under varying roasting conditions. The selenium in bio-selenium was recovered in the form of solid SeO2 with a purity of 99% in a maximum yield of 97% after roasting at 700°C. Furthermore, the chemical reduction of SeO2 to Se was carried out, and metallic Se with a purity of 99% (based on metal) was obtained.

Original languageEnglish
Pages (from-to)330-337
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume79
Issue number6
DOIs
Publication statusPublished - 2015 Jun 1

Keywords

  • Bio-selenium
  • Metallic selenium
  • Oxidizing roasting
  • Pseudomonas stutzeri NT-I
  • Purification
  • Selenium dioxide
  • Selenium oxyanion-reducing aerobic bacterium
  • Thermodynamics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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