| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate the treatment of the org. waste contg. protein or lipid by controlling the water content of the digested sludge to a value at which a fermentation inhibitor does not exceed the upper-limit concn. SOLUTION: A garbage 1 as an easily decomposable org. matter is introduced into a fermentation tank 2, heated to about 55 deg.C and anaerobically digested, and the generation of a biogas 3 is measured. Since the garbage 1 contg. 90% water is anaerobically digested without any dilution, the water content of the digested sludge 4 in the fermentation tank 2 is increased to about 99%. Similarly, the garbage 1 is charged into the fermentation tank 2, heated to about 55 deg.C and anaerobically digested and the generation of the biogas 3 is measured. However, the digested sludge 4 in the fermentation tank 2 is sent to a membrane separator 5, soid is separated from liq. by an submerged membrane separator 6, the filtrate 7 is discharged, the digested sludge 4' concentrated thereby is returned into the fermentation tank 2, and the water content of the digested sludge 4 in the tank 2 is decreased.</p> |
