PROBLEM TO BE SOLVED: To provide an odorless fermentative decomposition treatment system in which biomass (organic matters) is subjected to fermentative decomposition treatment in an inexpensive, a convenient, an easy, a sanitary, and moreover in an efficient manner in an extremely short period by using microorganisms, while at the same time, substantially reducing generation of malodor resulting from activity of putrefying bacteria and saprophytic bacteria, that is normally generated, when performing fermentative decomposition treatment of the biomass.SOLUTION: In an odorless fermentative decomposition treatment system, firstly and concretely, a necessary spawn parent material (a bacteria bed) is manufactured by using an acidic (PH4.0 or less) fermentative decomposition accelerating liquid composed from lactic acid bacteria or the like derived from cereal grain. Then, an appropriate amount of the fermentative decomposition accelerating liquid is sprinkled and mixed into biomass (organic matters) to be decomposed, and after suppressing generation of malodor, the biomass is stacked and further covered with an appropriate amount of the spawn parent material (the bacteria bed), and left to stand to be anaerobically fermented. After finishing the anaerobic fermentation, and after agitating and mixing (aeration) the biomass and the bacteria bed, the agitated and mixed matters are stacked and left to stand for aerobic fermentation. This operation is repeated until decomposition is finished.
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