A lab-scale study for efficient removal of Cr from leather industry wastewater

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Research Paper 01/12/2020
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A lab-scale study for efficient removal of Cr from leather industry wastewater

Aqsa Riaz, Sofia Nosheen, Tahira Aziz Mughal, Saira Riaz
Int. J. Biosci.17( 6), 147-153, December 2020.
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The leather tanning industry is the second most dynamic industry in Pakistan. It generates all sort of wastes including a large number of effluents which remains untreated causing adverse environmental impacts. In the present study, the practical focus is given to find the best innovative and low-cost approach for the treatment of Chromium in the wastewater. It highlighted coagulation using MgO, adsorption using activated carbon, and biosorption using bark and leaf extracts of F. religiosa (peepal tree). Among various applied approaches activated carbon gave the best results in terms of removal efficiency (above 90 %) even at higher Cr concentration (100 ppm) while bark extract of F. religiosa also showed 80% removal efficiency (25 ppm Cr concentration). Furthermore, it was revealed that greater than 90% removal can be achieved with just 5 mg of adsorbent dosage. Contact time showed an enhanced positive effect on the removal of toxic metal Cr. at 60 min shaking. An overall study proved that activated carbon is a good adsorbent for removal of Cr from wastewaters and green bio sorbents can also be used as a sustainable low-cost effective treatment for leather industry wastewater.


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