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Bioleaching of arsenic from medicinal realgar by pure and mixed cultures

Paper ID Volume ID Publish Year Pages File Format Full-Text
35693 45102 2007 7 PDF Available
Title
Bioleaching of arsenic from medicinal realgar by pure and mixed cultures
Abstract

The aim of this paper is to determine the efficiency of bioleaching of arsenic in realgar, a Chinese mineral drug, using pure cultures of Acidithiobacillus ferrooxidans or Acidithiobacillus thiooxidans and a mixed culture of A. ferrooxidans and A. thiooxidans. The experiments were carried out in shaker flasks, at 150 rpm, 30 °C at a culture pH of 1.80. To investigate the mechanism of the bioleaching in realgar, media with and without ferrous iron were chosen for the experiments. The results showed that the leaching rate of arsenic in realgar after 20 days was higher (43%) in A. ferrooxidans cultures with ferrous iron compared to cultures without ferrous iron (10%), and the leaching rate of A. thiooxidans cultures only increased from 21% to 23% in the presence of ferrous iron. The leaching rate of arsenic in mixed culture with ferrous iron was greatly enhanced from 16% to 56%, indicating that bioleaching in mixed culture is preferable for the dissolution of realgar.

Keywords
Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans; Realgar; Bioleaching; Chinese mineral medicine
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 42, Issue 9, September 2007, Pages 1265–1271
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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