| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid fertilizer from methane fermentation sludge, enabling components in the methane fermentation sludge to be effectively utilized. <P>SOLUTION: Methane fermentation sludge produced in a methane fermentation equipment 1 of a methane fermentation process, a liquid obtained by subjecting the methane fermentation sludge to separation with a membrane-equipped separation apparatus 3, and a dehydrated filtrate obtained by dehydrating the methane fermentation sludge with a dehydration apparatus 4, each in a specified amount, are introduced as liquid fertilizer raw materials into a component control tank 2. The mixing ratio of the raw materials is controlled in the component control tank 2 to give a liquid fertilizer. The liquid fertilizer is exposed, together with a carrier 8 holding nitrifying bacteria, to air in a flow passage 7 which is open to air and in which the depth of water is small, causing oxygen in air to be taken into the carrier 8 and the liquid fertilizer. Thus, the oxygen concentration in the liquid fertilizer is raised by oxygen taken thereinto and the nitrifying action is promoted to modify the liquid fertilizer components. <P>COPYRIGHT: (C)2004,JPO</p> |
