Abstract
Model surface water prepared by extracting a leaf mold and the river water pretreated by coagulation sedimentation were treated by the fixed bed columns packed with 5 kinds of GAC. The adsorption abilities for precourcers of organohalogen were examined after 2030 days when the adsorption effect attained to pseudo-steady state and the biological decomposition effect was unremarkable. The smaller substances in molecular weight could be adsorbed at the shorter contact time. It was found that the maximum adsorbable molecular weight (Mmax), which was determined from gel chromatogram, could be estimated by the contact time (θ, min) for each GAC irrespective of the water samples, and the following equation was obtained in the range of θ from 1 to 12 min.
Mmax=kθ+80
Furthermore, it was found that the values of k increased with increase of the pore volume of GAC from 2 to 10 nm in diameter.
