Abstract
Volatile compounds in solid swine manure were separated by cold-trapping of head-space gas, steam distillation and vacuum distillation, and characterization was performed by gas chromatography-mass spectrometry. Fifty-four components except stearic acid were identified, and the relationships between the components and the separation techniques were studied. It was investigated which components were important for malodor of swine manure, using pattern similarity of gas chromatograms. Carboxylic acids, p-cresol, and skatole were essential components for the malodor. Vacuum distillation was the best technique for separation of the volatile components from solid swine manure, although carboxylic acids and phenols were not recovered completely.
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