Adsorption linked fungal degradation process for complete removal of Lanasyn olive dye using chemically valorized sugarcane bagasse

Abstract

Textile dye effluents have been reported for many deleterious effects; therefore, it is essential to remove before releasing into waterbodies. A two-step agro-waste-based technology for the remediation of a textile dye Lanasyn olive was developed in this study. The first step involved the chemical modification of agro-waste sugarcane bagasse (SCB) with a natural acid (alginic acid). The modified SCB was used for the column bed preparation and adsorptive removal of the dye. In the second step, SCB used for dye removal was decolorized through a fungus Pleurotus sp. to produce a dye-free SCB with a potential for application as manure. To evaluate the efficacy of the column device, parameters like removal percentage, and adsorption capacity were determined. There was 90% removal of dye in aqueous dye solution and 83% removal in dye spiked textile industry effluent. To comprehend the column properties, three non-equilibrium models—Thomas, Yoon-Nelson, and Adams-Bohart—were used. Among the models applied, Adams-Bohart fitted well with the obtained data. Dye bioremediation efficiency by Pleurotus sp. was assessed by studying the deviation in absorption maxima, dye decolorization on the agar plate, Fourier-transform infrared spectroscopy (FTIR). The fungus-treated SCB showed no signs of residual toxicity towards alga Chlorella vulgaris. The carbon, hydrogen, nitrogen, sulfur (CHNS) profile examination of spent SCB revealed significantly improved nitrogen content after the treatment (from 0.35% to 0.69%). The prototype of the column, chemical valorization of SCB, and degradation of dye-adsorbed SCB through Pleurotus sp. provides a green solution for the safe disposal of textile dye through a novel agro waste-based treatment process.