| abstract |
PROBLEM TO BE SOLVED: To utilize reaction characteristics of anaerobic microorganisms, particularly in a method for fermenting organic waste containing solid matter such as sewage sludge, surplus sludge, livestock manure, garbage, food manufacturing waste, etc. Thus, the present invention provides a method for optimizing a biological treatment process for efficiently solubilizing and reducing the molecular weight of organic solids in a short time in a short time in a hydrogen / methane two-stage fermentation treatment process. SOLUTION: Biologically recovering hydrogen and methane by a two-stage fermentation method comprising anaerobic solubilization and hydrogen fermentation in the previous stage of organic waste treatment, followed by a methane fermentation process in the subsequent stage. An anaerobic treatment method and apparatus characterized by the above. An anaerobic treatment method is a biological reaction of 30-70 ° C., pH 5-8.5, returning a part of the effluent component from the methane fermentation process to the solubilization / hydrogen fermentation process, and two-stage fermentation, and The hydraulic residence time of the solubilization / hydrogen fermentation process is 0.2 to 5 days, the hydraulic residence time of the hydrogen fermentation process is 0.2 to 2 days, and the hydraulic residence time of the solubilization process is It is preferable to set it as 3 to 4.8 days. [Selection] Figure 1 |