PROBLEM TO BE SOLVED: To provide an efficient method for sterilizing harmful fungi, which is especially effective in composting or in a reusing method of bedding by being used for domestic animal waste or bedding.SOLUTION: In an efficient method for sterilizing harmful fungi in organic waste or bedding, at least one kind of microorganism selected from a group comprising the genus Bacillus, genus Geobacillus and genus Aeribacillus is added to organic waste or bedding, and a gas flow containing oxygen is supplied from the outside into the organic waste or bedding, to thereby more excellently sterilize harmful fungi in the organic waste or bedding in comparison with organic waste or bedding not containing microorganism. A composting method utilizing this method in composting of organic waste or bedding is also provided.【課題】特に、家畜廃棄物や敷料において用いることで、堆肥化または敷料の再利用方法において有効である、有害菌の効率的な殺菌方法を提供する。【解決手段】バチルス(Bacillus)属、ジオバチルス(Geobacillus)属及びエアリバチルス(Aeribacillus)属からなる群から選択される少なくとも1種の微生物を有機廃棄物又は敷料に添加し、該有機廃棄物又は敷料に、酸素を含むガス流を外部から供給し、該微生物を含まない有機廃棄物又は敷料と比べて、有機廃棄物又は敷料中の有害菌がよりよく殺菌されることを含む、有機廃棄物又は敷料中の有害菌の効率的な殺菌方法、ならびに有機廃棄物又は敷料の堆肥化にこの方法を利用することを含む堆肥化方法。【選択図】図１
