REMOVAL OF CHROMIUM FROM AQUEOUS-SOLUTION

Laboratory studies were conducted to assess the ability of natural mos s and copper-coated moss to remove Cr(III) and Cr(VI) from aqueous sol utions. Parameters investigated included pH, contact time, initial con centration, sorbent dosage and temperature. Application of the Langmui r isotherm to the systems yielded maximum sorption capacities of 18.9 and 7.1 mg/g for Cr(III) and Cr(VI), respectively. In addition, a seri es of flow studies was carried out using columns containing a mixture of natural and copper-coated moss. Results indicated that the treatmen t of aqueous solutions containing a mixture of Cr(III) and Cr(VI) usin g such a column is feasible.