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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Chemical behaviors of different arsenic-bearing sulphides bio-oxidated by thermophilic bacteria
YANG Hong-ying(杨洪英)1,  GONG En-pu(巩恩普)2
YANG Li-li(杨丽丽)2,  WANG Da-wen(王大文)1

1. School of Materials and Metallurgy, Northeastern University, 
Shenyang 110004, China; 
2. School of Resources and Civil Engineering, Northeastern University, 
Shenyang 110004, China

Abstract:The study on arsenopyrite and realgar of bacterial oxidation shows that the chemical behaviors of different arsenic-bearing sulphides oxidated by thermophilic bacteria are quite distinct. Arsenopyrite is active and quickly eroded in bacteria-bearing solution. With a high leaching rate over 95%, the arsenopyrite phase cannot be detected by X-ray diffraction(XRD). Arsenopyrite is highly toxic to bacteria that at the initial stage of bio-oxidation, bacterial growth is inhibited and the number of bacterium cell drops from 2.26×108/mL to the lowest 2.01×105/mL. At the later stages of bio-oxidation, bacteria grow fast and reach 2.23×108/mL. Comparably, realgar is inertial and resistive to bacterial corrosion and oxidation. Arsenic in realgar crystal is hard to be leached and the residue is still realgar phase, as indicated by XRD. The cell number of bacteria varies a little, decreasing from 2.26×108/mL to 2.01×107/mL, during the bacterial oxidation. The results show that the crystal structure and arsenic valency of arsenic-bearing sulphides play a vital role during the leaching process of bacterial oxidation.

 

Key words: thermophilic bacteria; bacterial oxidation; chemical behavior; arsenopyrite; realgar; toxicity

ISSN 1672-7029
CN 43-1423/U

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