Previous batch studies have shown that leaf mould is a potentially useful biosorbent for the treatment of wastewaters contaminated with hexavalent chromium. This paper examines its use for continuous adsorption in columns and compares the results with a parallel study using an activated carbon column. Both columns were operated at a pH of 2.5 and a flow-rate of 74 ml/min. The results show that, although the Cr(VI) adsorption capacities of the leaf mould were only 25.9 mg/g compared with a value of 75.6 mg/g for the activated carbon, the leaf mould caused little or no reduction and produced an effluent with very low concentration of trivalent chromium. The activated carbon, on the other hand, had a high reducing action. The data were also tested against the Bed-Depth-Service-Time model and it was found that, although the compliance was nonlinear, the model was appropriate for design purposes.