Degrading of textile effluent through combined biological and advanced oxidation process utilizing manganese oxide as a catalyst.

Abstract

The discharge of textile effluents into waterbodies or into the environment poses a serious threat since this waste water contains harmful compounds such as dyes, complex organic compounds and heavy metals which can cause health problems to humans as well as on the organisms living in the water bodies. This' therefore requires efficient. methods for the complete reduction of these toxic substances. The aim of this study was therefore to degrade the textile effluent through the combined biological method and advanced oxidation process utilizing manganese oxide as the catalyst for hydrogen peroxide instead of iron catalyst which has severe impractical limitations. Results: characterization of the textile. effluent showed that the concentration of impurities was too high as to the discharge. standards set by NEMA 1999 with the highest concentration being 5600 ptCo for colour and the lowest was for Total suspended solids (TSS). Biological treatment using pure cultures of E-Coil after incubation of seven days showed good percentage removal of colour of about 82%. However, the combined treatment method showed good percentage reduction of most of the physio chemical parameters at acidic pH Of 3, optimum amount of hydrogen peroxide used for the combined treatment was 4.5g/l and optimum amount of catalyst used was 300mg/l. the chemical treatment of the effluent alone required higher quantity of the catalyst and hydrogen peroxide for complete reduction of the physio chemical parameters, 700mg/l of the catalyst was used and 6.6g/l of hydrogen peroxide was used for efficient reduction of the physio chemical parameters. Conclusion: the textile effluent was characterized for the impurities; Colour, TDS, TSS, turbidity and the toxicity was determined using the BOD/COD ratio and it was found out to be 0.35. Treatment was carried out using the biological method, chemical method and the combined treatment method. The combination of biological and chemical method utilizing manganese catalyst yielded higher efficacy. This study demonstrates the potential of biological isolates in enhancing the management of dye effluent in textile industries.