1
Agricultural Microbiology Department, National Research Center, Cairo, Egypt
2
Microbiology Department, Faculty of Agriculture, Cairo University
Abstract
Hundred fifty bacterial isolates were obtained by enrichment culture from 12 samples collected from soil
contaminated with dye effluents and effluent treatment plants of textile and dyeing industry at New Borg
El-Arab, Cairo, Kafr El-Dawar, and El-Mehalla El-Kubra regions. The isolation of the microbial
consortium was conducted on mineral salts medium (MSM) supplemented with three dyes. The
microbial consortium was able to decolorize dyes, as evident by clearing the three azo dyes solutions
under anoxic and anaerobic conditions. The isolates were checked for their ability to decolorize direct
violet and reactive red dyes. The efficiency of the bacterial isolates in dye removal was investigated
under aerobic and anaerobic conditions. The study revealed that no decolorization has taken place by
isolates under aerobic conditions. The results revealed that the percentage of decolorization by the
isolates reached 98.52 and 97.95 % of the original color of direct violet and reactive red dyes after 9 and
15 days, respectively, under anaerobic conditions. Twenty five isolates were selected as representative
isolates based on the morphological and biochemical analyses. Two isolates are long rod, 6 isolates are
short rods, and seventeen isolates belong to family enterobacteraece. The characterization of bacteria
showed that the isolates belong to Bacillus and Pseudomonas sp. The degradation of the dyes is usually
judged by the formation of aromatic amines. Most of the isolates under anoxic conditions were found to
produce aromatic amines. This suggests the degradation of the dyes by the isolated bacteria.
Darwesh, O., Abd El-Rahim, W., Barakat, O., Sedik, M., & Moawad, H. (2008). Degradation of Synthetic Aromatic Textile Dyes by Native Bacteria Isolated from Textile Mill sites. Catrina: The International Journal of Environmental Sciences, 3(1), 71-80.
MLA
Osama Darwesh; Wafaa Abd El-Rahim; Olfat Barakat; Mohamed Sedik; Hassan Moawad. "Degradation of Synthetic Aromatic Textile Dyes by Native Bacteria Isolated from Textile Mill sites". Catrina: The International Journal of Environmental Sciences, 3, 1, 2008, 71-80.
HARVARD
Darwesh, O., Abd El-Rahim, W., Barakat, O., Sedik, M., Moawad, H. (2008). 'Degradation of Synthetic Aromatic Textile Dyes by Native Bacteria Isolated from Textile Mill sites', Catrina: The International Journal of Environmental Sciences, 3(1), pp. 71-80.
VANCOUVER
Darwesh, O., Abd El-Rahim, W., Barakat, O., Sedik, M., Moawad, H. Degradation of Synthetic Aromatic Textile Dyes by Native Bacteria Isolated from Textile Mill sites. Catrina: The International Journal of Environmental Sciences, 2008; 3(1): 71-80.
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