In this study the adsorption of pb(II), Zn(II), Cd(II), and Ni(II)
metal ions by sawdust were investigated in a batch reactor. This process was rapid and the time reaching to an equilibrium was
about half an hour. The amount of adsorption depended on the species and initial concentrations of metal ions and the PH of
solutions. In the lower PH (PH<3), adsorptions were insignificant. The amount of adsorbed metal ions on the sawdust increased by the increasing of initial ion concentrations. The
sorption phenomenon was expressed by the Freundlich adsorption isotherm. The resulted experimental data were in agreement with
the Freundlich model. Pretreatments were also done on the sawdust. It was observed the pretreatment by N aOH caused
adsorption to increase in comparison with the sorption on the commercial activated carbon. This adsorption was significant. Also Column tests were done by synthetic waste Water and Nickel
plating rinse water.
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