Removal of Humic Substance Dissolved in Water. II.

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Abstract
This paper describes the adsorption properties of humic substances onsurface-treatedcarbon adsorbents in aqueous solutions including inorganic compounds. Activated carbon fiber made from phenol resin (ACF), Pittsburgh activated carbon (AC) and Electronic conductive carbon black (EC) were used. The solution behavior of humic substances varied due to the presence of certain inorganic compounds. When the valence and/or concentration of the inorganic compounds increased, lower molelcular-weight components (M.W. 1001, 000) in humic substances were converted to higher molecular-weight components (M.W. 1, 0003, 000) due to aggregation. The adsorbed amounts of higher molecular-weight components (M.W. 1, 0003, 000) was larger by using EC with a large volume of meso-pores than by using ACF and AC being rich in micropores.

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