| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a methane fermentation apparatus that can sufficiently suppress the outflow of sludge from the upper part of its fermentation tank. <P>SOLUTION: In the methane fermentation apparatus equipped with the fermentation tank 2 storing granular microorganism sludge, water to be treated is introduced into the lower part in the fermentation tank 2 and flows upward thereby bringing the water into countercurrent contact with the sludge, an organic substance in the water to be treated is decomposed to generate a biogas containing methane, and the water to be treated and the biogas are discharged from the upper part of the fermentation tank 2. In the fermentation tank 2, a gas-solid-liquid separation part 7 for mutually separating the biogas, sludge and water to be treated, and a gas blowing part 9 for returning the biogas discharged from the fermentation tank 2 to blow it into the water to be treated above the gas-solid-liquid separation part 7 are provided. Since sedimentation of the sludge is sufficiently accelerated by the separation action of the gas-solid-liquid separation part 7 and the agitation action of the biogas blown from the gas blowing part 9, the outflow of the sludge from the upper part of the fermentation tank 2 can sufficiently be suppressed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
