Sustainable biotreatment of textile dye effluent water by using earthworms through vermifiltration

Abstract

Objective: A research was conducted to explore the reuse possibilities of the textile dye effluent propagated from the textile dye industry. The current study reports vermiculture based effluent treatment method through the chief intention of interconversion of contaminated effluent water into ecologically harmless water. Methods: Hence a new and typical technology, vermifiltration of effluent using wastewater eating earthworms has been evolved. Results: Outcome recommended that vermifilter revealed maximal chemical oxygen demand (126 mg L−1), Biological oxygen demand (56 mg L−1), Total suspended solids (181 mg L−1) and Total dissolved solids (298 mg L−1) decreased by 85–89%, 76–80%, 73–77% and 71–76% by the result of vermifiltration. Bioavailability of some heavy metallic compounds such as Ni, Cd, Cu, Zn, Pb, and Cr brought down considerably during vermifiltration. Vermifilter and control metal accumulations ranged from 0.2 ppm to 2.34 ppm and from 0.10 ppm to 2.98 ppm respectively. The SEM illustration reveal that the morphology of the vermicast of control and vermifiltration which is differing significantly. When the concentration of textile dye sludge increases it also increases the destruction of tissues constantly. Histological of the gut domain exposed moderate harm in 50% dilution. Conclusions: Therefore, these studies concluded that vermifiltration can be used as an eco-friendly technique which can be considered the same as a paradigm for textile industries effluents remedial development.

Keywords

• Earthworms
• Textile effluents
• Vermifiltration
• Heavy metals