Process Technology for the Removal of Cr(VI) from Wastewater Using Pig Iron Sludge

Abstract The usage of pig iron sludge nanoparticles as adsorbent was explored to remove Cr(VI) from effluents. Batch sorption was administered to check the effect of various parameters on the sorption method, namely, pH, interaction time, as well as Cr(VI) concentration and dosage. The adsorption potential was related with the parameters. An inovative flow chart was proposed by using this sludge, which is a byproduct from the pig iron manufacturing industries, as adsorbent for the treatment of Cr(IV)‐contaminated water, and then this sludge is recycled for drying followed by filtration. The adsorbed Cr(VI) will be useful for producing steel in a blast furnace. The sorption followed a second‐order mechanism and the experimental data obeyed the Langmuir adsorption isotherm. Surface diffusion was found to be the sluggish step and thus is the rate‐limiting step.