Abstract
Abstract Volatile and odorous components were isolated from anaerobically or aerobically digested liquid swine manure by direct solvent-extraction and flash-distillation under reduced pressure. The concentrations of indole, oxindole, dimethylsulfoxide, phenol, and a few carboxylic acids increased, and o-aminoacetophenone decreased during digestion. Alkaline components were not so important for the odor. Offensive odor was formed by mixing phenols and carboxylic acids. Complete aeration resulted in a remarkable decrease of lower carboxylic acids.
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