| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for removing hydrogen sulfide from a biogas by which hydrogen sulfide incorporated in the biogas without providing a large-scaled desulfurizing tower or the like in a biogas line. <P>SOLUTION: The method for removing hydrogen sulfide includes: a stage where a biomass is fed to an anaerobic fermentation tank; a stage where the biomass is fermented, so as to obtain a biogas and an anaerobic fermented solution; a stage where the anaerobic fermented solution is subjected to waste water treatment; a stage where sludge produced by the waste water treatment is flocculated with a ferrous flocculant; a stage where the flocculated sludge is separated, so as to obtain concentrated sludge comprising the ferrous flocculant; a stage where at least a part of the concentrated sludge is returned to the anaerobic fermentation tank; and a stage where the biogas is recovered from the anaerobic fermentation tank to which the concentrated sludge is returned. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
