Abstract: Chitosan has the property of binding heavy metal ions.Its maximum amount of adsorption and equilibrium time have been studied.There is no significant difference in the adsorp-tion ability between chitosan treated with nitrogen and those without nitrogen treatment. Chitosan shows nonspecific adsorption in the binding heavy metal ions such as plumbum, chromium,Copper,Cadminm.

Key words: chitosan, heavy metal ions, waste water treatment