NOMに対して破過に達した生物活性炭のシマジンに対する吸着特性

概要

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Adsorption characteristics of Biological Activated Carbon (BAC) operated for 5 years and 3.5 years in a pilot plant were evaluated for simazine. The performances of both BACs on natural organic matter (NOM) removal were completely the same. Both BACs removed NOM with less than 500 daltons of the apparent molecular weight fraction by biodegradation, however, they can not remove NOM by adsorption at all. GAC saturated with NOM in a laboratory for short-term showed larger adsorption capacity for simazine than both BACs from the pilot plant. The BAC operated for 5 years showed smaller adsorption capacity for simazine than the BAC operated for 3.5 years, suggesting BAC is gradually saturating with simazine after saturation with NOM, even after 5 years operation. NOM with less than 500 daltons competed with simazine for adsorption site on BAC, however, NOM with more than 3,000 daltons did not affect on simazine adsorption on BAC which is long-term operated.
2000-09-10