| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an anaerobic digestion apparatus of an organic waste liquid reducing an amount of organic substances without increasing a heating energy or an amount of a flocculant to be used, even under a high organic-matter loading, and increasing recovered amount of methane gas. <P>SOLUTION: Organic sludge (organic waste liquid) is introduced into a high-temperature digestion tank 1, and subjected to anaerobic digestion at 45-95°C. The digested sludge in this high-temperature digestion tank 1 is introduced into a medium-temperature digestion tank 2, and subjected to anaerobic digestion at 25-40°C. Part of the digested sludge in this medium-temperature digestion tank 2 is drawn out and concentrated in a solid-liquid separator 3. Liquid separated in the solid-liquid separator 3 is taken out of the system. Part of the concentrated sludge is returned to the medium-temperature digestion tank 2 through a return pipe 4. Part of the digested sludge sent from the medium-temperature digestion tank 2 is drawn out through a pipe 5 and modified in a modification device 6. The modified sludge is returned to the high-temperature anaerobic digestion tank 1 through a return pipe 7. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
