In the study, the adsorption of heavy metal ions (Cu2+, Cd 2+ and Ni2+) from cucurbita maxima husk(CMH), annona reticulate husk(ARH) and ananas comosus crown(ACC) was carried out, so as to comparatively evaluate the effectiveness of adsorbents for the purpose of removing Cu2+, Cd 2+ and Ni2+ from wastewater. The bioadsorbents like cucurbita maxima husk(CMH), annona reticulate husk(ARH) and ananas comosus crown(ACC) collected locally and crushed into particle size of about 0.36 to 0.48 mm, 1g of dosage, known concentration of metal ion, pH 6 at room temperature was investigated. The present study reveals that the low cost bioadsorbent of CMH is used for removing 89%, 81%, 80% of copper, cadmium and nickel respectively. ARH used for removing 84%, 82%, 79% copper, cadmium and nickel respectively. ACC is used for removing 84%, 80%, 78% copper, cadmium and nickel respectively from wastewater from the initial metal ion concentration of 50mg/L solution. The percentage removal of Cu2+, Cd2+ and Ni2+ was found to increase with increase in contact time and attain equilibrium.
