Leaching of Orange Wastes and Subsequent Digestion. In order to select a proper solvent for limonene recovery, four
solvents including hexane, diethyl ether, dichloromethane, and ethyl acetate were used to extract the limonene followed
by digestion of the pretreated orange peel waste for confirmation. The pretreated orange peel waste was digested at
different concentration of volatile solids ranging from 0.5 to 2%.The results show that, for all VS concentration added, the
orange peel pretreated with hexane gave the highest methane yield (Figure 1). Hence, the pretreatment using hexane was
further investigated in order to obtain the best pretreatment method.
Leaching of Orange Wastes and Subsequent Digestion. In order to select a proper solvent for limonene recovery, foursolvents including hexane, diethyl ether, dichloromethane, and ethyl acetate were used to extract the limonene followedby digestion of the pretreated orange peel waste for confirmation. The pretreated orange peel waste was digested atdifferent concentration of volatile solids ranging from 0.5 to 2%.The results show that, for all VS concentration added, theorange peel pretreated with hexane gave the highest methane yield (Figure 1). Hence, the pretreatment using hexane wasfurther investigated in order to obtain the best pretreatment method.
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