Removal of zinc from industrial wastewater by using sand as adsorbent
Prof. Dr. Sachin Madhavrao Kanawade
Removal of heavy metals from water and wastewater has received a great deal of attention. Adsorption technique is one of the most technologies being used for treatment of polluted water, but seeking for the low cost adsorbent is the objective of this study. This study records lab scale experiments to test efficiency of sand in removing a heavy metal, Zn (II) from wastewater of electroplating industry. Solutions of varying concentrations of Zn (25-100ppm) were prepared and passed through sand column. Leach ate samples collected at different depths of sand column were analyzed for concentration of Zinc ions using atomic absorption spectrophotometer. To study the removal efficiency of sand column pH and influent injection rate were also varied. This method of heavy metals removal proved highly effective as removal efficiency increased with increasing pH while it decreased with increasing metals concentration. The removal efficiency was quite high for Zinc ranging from 71-87% and maximum adsorption occurred at depth 1m as compared to 0.6m & 0.8m depth. Since sand is cheap and easily available, so it can be concluded that the sand filtration, which is efficient and cost effective, has the potential to be used for removal of heavy metals from can successfully be used for removal of heavy metal from water and industrial wastewater.