Microorganisms Aerobically Degrading Skatole or Indole in Composting Processes

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The concentrations of skatole (3-methylindole) and indole were determined in the manure in chicken or pig waste composting processes, and microorganisms that aerobically degrade these indolic compounds were isolated. The concentration of skatole in the manure decreased as the treatment progressed in both composting processes. The concentration of indole decreased largely at the fermentation stage in the pig waste composting system; however, that was almost stable in the chicken waste composting system. The numbers of total aerobes and skatole- or indole-degrading microbes decreased at the fermentation stage and increased again at the finishing stage in both composting systems. In the chicken waste system, the largest number of skatole- and indole-degrading microbes was occupied by facultatively anaerobic gram-positive cocci at the pretreatment and fermentation stages, and by aerobic gram-positive cocci at the finishing stage. In the pig waste system, that was occupied by facultatively anaerobic gram-positive cocci at any stage. Enzyme preparations which were extracted from cultures of skatole-degrading isolates or indole-degrading isolates showed degradation activities of skatole or indole, respectively.
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