Abstract
Lees materials such as wheat bran, rapeseed, linseed, okara (lees of bean curd), and sakekasu (sake lees) were found to effectively adsorb organochlorine compounds. The amounts of these compounds such as chloroform, dichloromethane, and benzene adsorbed were plotted against the equilibrium concentration of substances in solution on a logarithmic scale. A linear relationship was obtained, indicating that the adsorption reactions were of the Freundlich type. When the lees materials were applied to wastewater (pH: 10) containing 0.1 g/l of dichloromethane, dichloromethane was removed from the wastewater in the range of 70–90% efficiency after 90 min. There was a high correlation between the removal efficiency and the number of spherosomes, which are intracellular particles attributed to the uptake of organochlorine compounds.
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