| 摘要 |
<p>PURPOSE:To subject excretion of a domestic animal to methane fermentation almost perfectly, by a method wherein the excretion of a domestic animal is decomposed to a low molecular substance in an aerobic atmosphere by oxidative heat generation due to aerobic bacteria and the decomposed excretion of the domestic animal is subjected to methane fermentation in an anaerobic atmosphere to be naturally recirculated by a convection. CONSTITUTION:The excretion of a domestic animal is decomposed to a low molecular substance in a decomposition tank 1 under an aerobic atmosphere and, in a methane fermentation tank 2 under an anaerobic atmosphere provided to the rear stage of the tank 1, a bottom part 4 to which gradient is imparted so as to be gradually made deeper toward an outlet side end part from an inlet side end part is provided to naturally recirculate the decomposed excretion of the domestic animal through the fermentation tank 2 from the upper part of the inlet side end part as shown by a dotted line 9 by a convection due to methane fermentation. In addition, in a purifying tank 3 under an aerobic atmosphere having aerobic bacteria provided to the rear stage of the tank 2, the excretion of the domestic animal after methane fermentation is received from the lower part of the inlet side end part to be separated into a digestion sludge and a disconnected liquid.</p> |
