Detoxifying of high strength textile effluent through chemical and bio-oxidation processes

•We investigated chemical and biological processes for detoxifying textile effluent.•Chemical and biological processes eliminate pollutants without tertiary treatment.•CETP detoxified effluent is sustainable to an aquatic life of Arabian Sea.•Textile CETP provides a sustainable solution to small scale textile industries.

Small-scale textile industries (SSTIs) in India struggled for the economic and environmental race. A full-scale common treatment plant (CETP) working on the principle of destabilising negative charge colloidal particles and bio-oxidation of dissolved organic failed to comply with Inland Surface Waters (ISW) standards. Thus, presence of intense colour and organics with elevated temperature inhibited the process stability. Bench scale treatability studies were conducted on chemical and biological processes for its full-scale apps to detoxify a high strength textile process effluent. Colour, SS and COD removals from the optimised chemical process were 88%, 70% and 40%, respectively. Heterotrophic bacteria oxidised COD and BOD more than 84% and 90% at a loading rate 0.0108 kg m−3 d−1 at 3 h HRT. The combined chemical and bio-oxidation processes showed a great promise for detoxifying the toxic process effluent, and implemented in full-scale CETP. The post-assessment of the CETP resulted in detoxify the toxic effluent.

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