Utilization of Fly and Coarse Ash for Removal of Heavy Metal Ions from Contaminated Water
Muhammad Ussama Javaid, Kashir Ali*, Muhammad Usman Qayyum, Ali Raza, Meh Gul and Zaman Ali
Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan
*Corresponding Author: Kashir Ali, Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan.
June 23, 2021; Published: July 09, 2021
Rapid industrialization has caused many environmental problems and the generation of wastewater is one of the major issues worldwide. Heavy metals are one of the major pollutants present in this waste water. Adsorption process has gained much interest for the removal of heavy metals from wastewater. Four types of ashes simple fly ash, simple coarse ash, acid activated fly ash and acid activated coarse ash were evaluated for the adsorption of Cadmium (Cd), Chromium (Cr), and Copper (Cu) from contaminated water in single contaminant system. Adsorption of these heavy metals was increased by increasing the contact time until the equilibrium attained. The adsorption sequence for the heavy metal removal was acid activated fly ash > fly ash > acid activated coarse ash > simple coarse ash. Pseudo first order kinetic model could best fit for the adsorption of Cd, Cr, and Cu. The effect of pH on the adsorption of Cadmium (Cd), Chromium (Cr), and Copper (Cu) was also studied. It was observed that the removal of cadmium and copper was maximum at basic pH while the removal of chromium was maximum at acidic pH. Results indicated that maximum adsorption was recorded on acid-activated fly ash for Cd (92.12%), Cr (85.22%), and Cu (64.01%) with the variation of time and pH. Our results suggest that the acid activated fly ash could be the best adsorbent out of these for the removal of cadmium, chromium, and copper because of its larger surface area and smaller particle size as well as the acid activation increase its adsorption efficacy due to the presence of electrostatic interaction.
Keywords: Heavy Metals; Wastewater; Adsorption; Fly Ash; Coarse Ash
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