Page 202 - C:\Users\am_se\OneDrive - Higher Education Commission\Desktop\FlipBook\

International Conference on

Recent Trends in Environmental Sustainability

ESCON22/NMsB/41
Simultaneous removal of hexavalent chromium and azo-dyes by a metal tolerant
bacterial strain isolated from tannery wastewater

Sabir Hussain1,*, Tanvir Shahzad1, Faisal Mahmood1
1Department of Environmental Sciences & Engineering, Government College University
Faisalabad; 3

Correspondence: sabirghani@gmail.com

Abstract
The present study was conducted to isolate and characterize a bacterial strain having the
capability to simultaneously remove hexavalent chromium [Cr(VI)] and different azo-dyes.
The strain was isolated from the tannery effluents collected from Kasur. Initially various
bacterial isolates were isolated from the tannery effluents through enrichment culture technique
and screened for removal of Cr(VI) as well as different azo dyes. On the basis of this screening,
the most efficient bacterial strain KH6 was selected for for further studies. The strain KH6
showed a good potential (> 90%) for simultaneous removal of different azo-dyes (viz. reactive
black 5, reactive red 20 and reactive yellow2) and Cr(VI) in the mineral salt medium. This
strain showed a good potential to tolerate the presence of different metals in the medium. This
strain also conducted a good simultaneous removal of azo dyes and Cr(VI) in the presence of
fairly high concentrations of NaCl salt as well as at various pH values in the mineral salt
medium. Hence, this strain might serve as a potential candidate for simultaneous removal of
dyes and Cr(VI) in the tannery effluents which are often loaded with high levels of NaCl and
different metals.
Keywords: Bacteria; Hexavalent Chromium; Azo-dyes; Simultaneous removal

Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus

169