Changes in Concentration of Residual Chlorine, Trihalomethanes and 2-Methylisoborneol in Tap Water by Aeration and with Activated Carbon Having Different Pore Size Distribution under Heating.

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The concentration of trihalomethanes in the gas phase equilibrated with a liquid phase increased with temperature. Moreover, the concentration of CHCl3, a main compound of trihalomethanes in tap water originated from river water, in the gas phase was higher than that in the liquid phase at 90°C . While blowing air into heated water, trihalomethanes in an electric thermo-pot transferred fast from liquid to gas phase due to the increase of the contact area. It is necessary to discharge the gas containing trihalomethanes outside of the pot in order to remove trihalomethanes effectively. In the initial period of use activated carbon adsorbed trihalomethanes in heated water. Activated carbon with a wide distribution of pore diameter could not fully desorb trihalomethanes adsorbed, but that with a narrow distribution of pore diameter of about 1.4 nm could desorb almost completely at about 100°C. Therefore, the activated carbon with the narrow distribution of pore diameter had a long lifetime for the removal of trihalomethanes. The activated carbon was able to adsorb 2-methyl-isoborneol in heated water, and it kept the adsorptivity for a long time if the concentration of 2-methyl-isoborneol was about 100pg/l.
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