To suppress generation of scale due to ammonium magnesium phosphate in a methane fermentation system or the like.
In a system of sending a raw material to a methane fermentation tank 7, taking out a part of the raw material sent to the methane fermentation tank to an ammonia removal device 102 outside the methane fermentation tank in parallel with a methane fermentation step, gasifying and removing ammonia included in the raw material to be a final target concentration while circulating it in the device in an anaerobic atmosphere, and returning it to the methane fermentation tank, a carbon dioxide gas dissolving device 200 and a cooling device 300 are provided, and carbon dioxide is dissolved in a methane fermentation digesting liquid. As the carbon dioxide, for instance, the carbon dioxide generated in the process of deammoniation of an ammonia stripping tower 10 is recycled.
SASAKI KOICHI
SHIBUYA KOJI
SATO CHIHARU
HISADA MINORU
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