| 摘要 |
<p>PURPOSE:To reduce remarkably the number of days for retaining waste water in a vessel by using acid-forming microbes and methane-fermenting microbes both of which are immobilized on a carrier, and treating waste water contg. org. materials in the course of acid formation and in the succeeding course of methane formation. CONSTITUTION:When waste water contg. org. materials is treated with a two- phase methane fermenting method consisting of the course of acid formation and the succeeding course of methane formation, acid-forming microbes immobilized on a carrier and methane-fermenting microbes immobilized on a carrier are used respectively in each course. Consequently, the number of days for retaining waste water in a treating vessel is remarkably reduced, and excess sludge is also reduced. In accordance with the kind of microbes to be used, acid formation is carried out at 20-45 deg.C and at 4.0-6.0pH or at 45-60 deg.C and at 4.0-6.0pH. Meanwhile, methane formation is carried out at 20-45 deg.C and at 6.5-8.5pH or at 45-60 deg.C and at 6.5-8.5pH.</p> |
