Mercury removal from wastewater by steamed hoof powder

Steamed Hoof Powder (SHP), size < 53 mu, was observed to have high adsorpti on capacity for Hg(II) with >95% removal from a solution containing 100 mg/ L of Hg(II) with only 0.1% (W/V) concentration of SHP. The SHP has good sea ling properties and gives clear and odour free effluent. Studies indicate t hat pH values between 2 and 10 have no effect on the adsorption of Hg(II) o n SHP. Light metal ions like Na+, K+, Ca2+ and Mg2+ up to concentrations of 500 mg/L and heavy metals like Cu2+, Zn2+., Cd2+, Co2+, Pb2+, Ni2+, Mn2+, Cr3+, Cr6+, Fe2+ and Fe3+ up to concentrations of 100 mg/L do not interfere with the adsorption process. Anions like sulphate, acetate and phosphate u p to concentrations of 200 mg/L do not interfere. Chloride interferes in th e adsorption process when Hg(II) concentration is above 9.7 mg/L. The adsor ption equilibrium was established within two hours. Studies indicate that a dsorption occurs on the surface sites of the adsorbent. (C) 1999 IAWQ Publi shed by Elsevier Science Ltd. All rights reserved.