| 摘要 |
<p>PURPOSE:To promote solubilization and to attempt to perform an effective anaerobic digestion treatment by a method wherein an org. sludge is made alkaline and is kept at a specified temp. to solubilize org. substances in the org. sludge and then, an anaerobic digestion treatment of the org. sludge is performed at a specified pH and a specified temp. CONSTITUTION:An org. sludge is fed into a hot alkali treating tank 2 and an alkali is incorporated from an alkali storing tank 1 so as to make pH 7.5-12.5 and it is heated to a temp. of 50-100 deg.C to solubllize the org. sludge. Then, in an anaerobic digesting tank 4, an anaerobic digestion treatment of the org. sludge after hot alkali treatment, is performed at an alkaline pH of 7.3-9.2 at a temp. of 20-60 deg.C. As the result, the amt. of the sludge is decreased in vol. by performing an anaerobic digestion treatment with a high digestion rate and methane gas can be recovered with a high efficiency.</p> |
