The effluent was provided by a paper plant located in Cajicá,Colombia. This plant does not produce the paper pulp but preparesit using H 2 O 2 rather than chlorine as the bleaching agent. Conse-quently the bleaching effluent does not contain chlorophenols. Be-cause of this, the effluent was enriched with: 2-chlorophenol (CP),2,4-dichlorophenol (DCP) and 2,4,6-trichlorophenol (TCP). Thephysicochemical characterization of the effluent resulting frombleaching was: 7.7 (pH), 421 UC (color), 2062 mg L ?1 (TOC) andnegligible chlorophenols concentrations.