IJEP 41(8): 924-930 : Vol. 41 Issue. 8 (August 2021)
1. Sri Ramakrishna Engineering College, Department of Civil Engineering, Coimbatore, Tamil Nadu, India
2. Dr. N.G.P. Institute of Technology, Department of Mechanical Engineering, Coimbatore, Tamil Nadu, India
Abstract
The heavy metals discharged into the water bodies are toxic to human beings and other life forms even at low concentrations. Biosorption of heavy metals using dried algal biomass can be an effective process for the removal of zinc ions from industrial wastewater. In this study, the batch removal of zinc ions from electroplating industrial wastewater using dried green algal species (Chlorella, Volvox and Zygnema) are investigated. The zinc uptake by biosorbents was dependent on the contact time, sorbent dosage, initial pH and the initial zinc ion concentration. Langmuir and Freundlich isotherm models were fitted with the equilibrium data. The maximum zinc removal efficiency was found to be 84.7, 79.0 and 69.8% for Chlorella, Volvox and Zygnema, respectively. The zinc uptakes by the three algal species were best described by the Freundlich isotherm model. This study verified the possibility of using green algal species Chlorella, Volvox and Zygnema as valuable biosorbent materials for the removal of zinc from industrial wastewater.
Keywords
Biosorption, Zinc(II), Chlorella, Volvox, Zygnema
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