Environmental Friendly Method for Textile Effluent Decolourization  

   Dr. Gimhani Madushika

Supervisors: Prof. (Mrs). SHP Gunawadena, Dr. (Ms). HLTU Ariyadasa

Department: Chemical and Process Engineering 

Faculty: Engineering 

Textile dyeing industry produces huge quantities of wastewater with unfixed dyes, which generate colour and toxicity in discharged water, creating environmental pollution.

Biological treatments have gained much attention globally as environmental-friendly and cost-effective techniques to decolourize textile industry effluent. In this study, decolourization potential of textile dyes by microbial strains, which were isolated from local-environment, and their applicability in industrial wastewater decolourization were investigated.


During the study, five bacterial strains with dyedecolourization potential were isolated and identified using sequencing analysis of 16S rRNA gene. Bacterial consortium was developed by selecting the most effective isolates. Batch decolourization of individual dyes and dye mixtures were carried out in suspended cultures with monocultures and bacterial consortium. Dye decolourization was further investigated in a fixed bed biofilm reactor (FBBR) where the biofilm was composed with the developed bacterial consortium.

Decolourization of the synthetic dye mixture and textile industry effluents was evaluated in FBBR in both batch and continuous mode. The bacterial consortium developed can effectively decolorize and degrade textile dyes in the FBBR into nontoxic compounds. Hence, this biological treatment can be considered potential technique for the treatment of textile dye-containing wastewater in industry.


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