COD removal and colour degradation of textile dye effluents by locally isolated microbes

ABSTRACT

Textile industry has been rapidly progressing over the years, leading to an increasing volume of water usage that contributes to the large production of textile wastewater. Biological treatment processes have been proven to be the most environmentally friendly, cost-effective and requiring reduced production treatment by-products. In this study, using microbial treatment was applied. Three potential local isolates of micro-organism had been isolated from textile wastewater. The treatment processes were studied under two conditions, namely aerobic and anaerobic. Decolourization of seven commercial textile dyes, namely Crystal Violet 3, Acid Black 1, Basic Blue 8, Acid Blue 147, Congo R, Chrysoiodine R and Yellow 2 G were studied. After seven days of incubation, a significant reduction of 92% for Yellow 2G (Y) and 73.73%for Chrysoiodine R was observed, indicating a high capability of the bacterial isolates indye-degrading activities. Highest chemical oxygen demand (COD) removal was achieved byisolate C3K (93.93%), followed by isolate C3W (90.5%) and isolate C1 (89.173%) in nineincubation days, highlighting the ability of these microbial isolates in removing COD from the individual textile dyes.

KEYWORDS:

• COD removal
• decolourization
• microbial treatments
• textile dyes
• wastewater

Acknowledgements

The authors would like to thank Humid Tropic Centre (HTC) Kuala Lumpur, Department of Drainage and Irrigation Malaysia (JPS) for research grant endowment (M0090-0006). Authors would also like to thank MyBrain15, Ministry of Higher Education Malaysia for the scholarship awarded and Faculty of Bioresource and Food Industry, UniSZA that enabled us to carry out the experiments. The Authors would like to declare that this research did not receive any other specific funding.

Disclosure statement

The authors declare no conflicts of interest.