Abstract
The purpose of this study is to examine dissolved organic matter (DOM) removal using charcoal made from Japanese cedar wood (Cryptomeria japonica D. Don). We used three types of charcoals carbonized at 450, 650, and 1050°C to compare their DOM removal rate and removal volume. The removal rates of DOM contained in rice-straw water and the DOM-fraction distribution in treated water were studied in laboratory experiments. The results showed that the charcoal at 1050°C (C1050) markedly removed DOM from rice-straw water. C1050 removed of 70% DOM in 48 h. UV (260 nm) absorbance, which can be used for the index of recalcitrant DOM concentration, decreased to 30% with C1050 treatment. DOM fractionation in treated water in 48 h showed that C1050 removed 97% of the hydrophobic acid contained in recalcitrant DOM. The molecular weight distribution showed that C1050 removed high-molecular-weight compounds including humic substances.
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