Biodecolourisation of the Azo Dye, Congo Red Using the Bacterium, Lactobacillus Delbrueckii
Keywords:Biodecolourisation, Lactobacillus delbrueckii, Congo Red, Azo dyes.
Background: Waste water released from the use of synthetic dyes in different textile and other dye stuff
industries require treatment before it is discharged into the environment to prevent groundwater contamination.
Considerable interest has been on decolourisation and degradation of dyes by microorganisms due to their
efficiency and duration of treatment.
Objective: The present study has been designed to isolate a bacterial strain capable of decolourising Congo
Red and to test its efficiency of decolourisation.
Materials and Methods: In the present study the natural isolate, Lactobacillus delbrueckii was isolated
from the contaminated soil and used in the decolourisation of the dye, Congo Red. Decolourisation was
tested in concentration ranging from 10 to 1000ppm for 15 days. Activities of ?-amylase and protease were
determined during decolourisation.
Results: Decolourisation was achieved within 15 days at lower concentration. The enzymes ?-amylase and
protease produced by this bacteriumexhibited increased activity with the increase in treatment period.
Conclusion: The results showed practical application potential of this bacterial strain in decolouration of
dye effluents that can help to solve the pollution problems caused by textile and dyeing industries.