2.4. Adsorption experiments
GAC filter column was used for the adsorption experiments. The column was 50 mm in its inside-diameter and 2000 mm in its length. Two columns were filled with two different carbons. They were different in base material; coal-based carbon (Calgon F-400, U.S.A.) and coconut-based carbon (Samchully, Korea). Their pore volume and specific surface area, which were measured by the Autosorb-1 MP (Quantachrome, U.S.A.), are summarized in Table 1. Raw water was fed into the column at the flow rate of 200 mL/min. The carbon depth was 1000 mm so that an empty bed contact time (EBCT) became 10 min.