Simultaneous chromate reduction and azo dye decolourization by Brevibacterium casei: azo dye as electron donor for chromate reduction

Journal of Hazardous Materials
Tsz Wai NgPo-Keung Wong

Abstract

Chromate [Cr(VI)] and azo dyes are common pollutants which may co-exist in some industrial effluents. Hence studies of biological treatment of industrial wastewater should include investigation of the co-removal of these two pollutants. Brevibacterium casei, which can reduce Cr(VI) in the presence of the azo dye Acid Orange 7 (AO7) under nutrient-limiting condition, was isolated from a sewage sludge sample of a dyeing factory. Response surface methodology, which is commonly used to optimize growth conditions for food microorganisms to maximize product(s) yield, was used to determine the optimal conditions for chromate reduction and dye decolourization by B. casei. The optimal conditions were 0.24 g/L glucose, 3.0 g/L (NH(4))(2)SO(4) and 0.2 g/L peptone at pH 7 and 35 degrees C. The predicted maximum chromate reduction efficiencies and dye decolourization were 83.4+/-0.6 and 40.7+/-1.7%, respectively. A new mechanism was proposed for chromate reduction coupling with AO7 decolourization by B. casei. Under nutrient-limiting condition, AO7 was used as an e(-) donor by the reduction enzyme(s) of B. casei for the reduction of Cr(VI). The resulted Cr(III) then complexed with the oxidized AO7 to form a purple coloured intermediate.

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Citations

Apr 1, 2011·Journal of Industrial Microbiology & Biotechnology·Hongmiao PanHuizhong Chen
Oct 8, 2013·Journal of Hazardous Materials·Ashvini U ChaudhariKisan M Kodam
Oct 31, 2014·Critical Reviews in Microbiology·Piyush Malaviya, Asha Singh
Dec 29, 2015·Colloids and Surfaces. B, Biointerfaces·Pengfei SunYuhua Zhao
May 23, 2012·Journal of Hazardous Materials·Carlos E Barrera-DíazBryan Bilyeu
Jan 24, 2014·TheScientificWorldJournal·Neelam Bansal, Shamsher S Kanwar
May 18, 2016·Environmental Science and Pollution Research International·Wan Fadhilah KhalikSin-Li Lee
Feb 1, 2018·Environmental Science and Pollution Research International·Saurabh Mishra, Abhijit Maiti
Nov 23, 2019·Environmental Monitoring and Assessment·Saurabh Mishra, Abhijit Maiti
Aug 24, 2020·Ecotoxicology and Environmental Safety·Jiashu LiuXiaoyu Zhang

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