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From the viewpoint of global warming prevention, it has become important to promote the practical use of biomasses. Methane fermentation, which is a representative technology for recycling biomasses, is classified by the solid concentration of biomass into the UASB and EGSB methods used in treating effluents with low solid concentrations, and the complete mixing methane fermentation used in treating organic wastes with high solid concentrations. The complete mixing methane fermentation, which has been used for many years, involves problems such as the inability to allow high loading achieved with the UASB and EGSB methods, and the need for a large methane fermentation tank, the high construction cost and the large site area. To address these problems, Sumitomo Heavy Industries Environment Co., Ltd. (SHI|EV) conducted a methane fermentation test with the aim of maintaining the fungus concentration inside the methane fermentation tank to enable high-load operation. Based on the test findings, SHI|EV also studied a case in which an actual facility was constructed.
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