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HOME > J. Microbiol > Volume 54(9); 2016 > Article
Journal Article
Cr(VI) removal from aqueous solution by thermophilic denitrifying bacterium Chelatococcus daeguensis TAD1 in the presence of single and multiple heavy metals
Han Li 1, Shaobin Huang 1,2, Yongqing Zhang 1
Journal of Microbiology 2016;54(9):602-610.
DOI: https://doi.org/10.1007/s12275-016-5295-5
Published online: August 31, 2016
1College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China, 2Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China1College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China, 2Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China
Corresponding author:  Shaobin Huang , Tel: -, 
Received: 11 June 2015   • Revised: 22 July 2016   • Accepted: 26 July 2016
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Abstract

Cr(VI) pollution is increasing continuously as a result of ongoing industrialization. In this study, we investigated the thermophilic denitrifying bacterium Chelatococcus daeguensis TAD1, isolated from the biofilm of a biotrickling filter used in nitrogen oxides (NOX) removal, with respect to its ability to remove Cr(VI) from an aqueous solution. TAD1 was capable of reducing Cr(VI) from an initial concentration of 10 mg/L to non-detectable levels over a pH range of 7–9 and at a temperature range of 30–50°C. TAD1 simultaneously removed both Cr(VI) and NO3 −-N at 50°C, when the pH was 7 and the initial Cr(VI) concentration was 15 mg/L. The reduction of Cr(VI) to Cr(III) correlated with the growth metabolic activity of TAD1. The presence of other heavy metals (Cu, Zn, and Ni) inhibited the ability of TAD1 to remove Cr(VI). The metals each individually inhibited Cr(VI) removal, and the extent of inhibition increased in a cooperative manner in the presence of a combination of the metals. The addition of biodegradable cellulose acetate microspheres (an adsorption material) weakened the toxicity of the heavy metals; in their presence, the Cr(VI) removal efficiency returned to a high level. The feasibility and applicability of simultaneous nitrate removal and Cr(VI) reduction by strain TAD1 is promising, and may be an effective biological method for the clean-up of wastewater.

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    Cr(VI) removal from aqueous solution by thermophilic denitrifying bacterium Chelatococcus daeguensis TAD1 in the presence of single and multiple heavy metals
    J. Microbiol. 2016;54(9):602-610.   Published online August 31, 2016
    DOI: https://doi.org/10.1007/s12275-016-5295-5
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