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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Apr Supplement 2013, 34 (2)                                     Back


nstantaneous and historical temperature effects on a-pinene

Study on application of biological iron sulfide composites in

treating vanadium-extraction wastewater containing
chromium (VI) and chromium reclamation

 

Yi-Fei Xie*, Xu-Dong Li and Fu-De Li

Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China

*Corresponding Author email : xieyf@cib.ac.cn

 

 

 

 

 

Publication Data

Paper received:

20 June 2012

 

Revised received:

12 August 2012

 

Accepted:

29 August 2012

 

Abstract

In this study, the Cr(VI)-resistant properties and regeneration characteristics of biological iron sulfide composites were investigated, which consist of sulfate reducing bacteria (SRB) and its in situ synthesized nanosized iron sulfides. Then the application of the composites in treating vanadium-extraction wastewater containing high concentration Cr(VI) and reclaiming Cr were performed. It was found that SRB in composites still survived after being used to treat vanadium-extraction wastewater, which could reduce reaction products Fe3+?and sulphur into Fe2+?and S2-?by using them as the electron acceptors and thus regenerating biological iron sulfide composites. The SRB also could be resistant to 600 mgl-1?Cr(VI) and reduce it gradually. Based on the Cr(VI)-resistant properties and regeneration characteristics of the composites, a reduction-regeneration recirculation process for treating vanadium-extraction wastewater and reclamation of Cr was developed. The results indicated that the contaminants in effluent reached the Chinese discharge standard of pollutants for vanadium industry (GB 26452-2011), i.e. the concentration of total Cr(TCr) was less than 0.912 mgl-1, Cr(VI) was less than 0.017 mgl-1?and V was less than 0.260 mgl-1. After 10 cycles of treatment, the Cr2O3 content in sludge reached 41.03%, and the ratio of Cr2O3/FeO was 7.35. The sludge reached the chemical and metallurgical (hydrometallurgy) grade of chromite ore and could be reclaimed.

 

Key words

Biological iron sulfide composites, Cr (VI), Vanadium-extraction wastewater, Reclamation, Sulfate reducing bacteria

 

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