| 摘要 |
PURPOSE:To develop the effective utilization by which excess sludge of food factories and night soil or sewerage treatment plants can be recycled. CONSTITUTION:When quick lime (calcium oxide) is added to the excess sludge, the quick lime reacts highly exothermically with water in the sludge to form calcium hydroxide (slaked lime). As a result various microorganisms in the sludge is completely killed and the sludge is partly hydrolyzed by the high alkalinity and temperature. Thereafter by adding straws, sawdust, and further tuff loam and leaf mold to the sludge and by fermenting the mixture, a completely aged organic manure can be produced. At the time of applying the manure to vegetables, excellent growth promotion of the vegetables without any adverse effect on them resulting from any applied amount of the manure can be attained. On the other hand sulfuric acid is added to the excess sludge and the resulting sludge is neutralized with an aqueous suspension of slaked line and then sawdust is added to it. The mixture is sufficiently blended while stirring. At the time of using the mixture thus produced as a culture medium of Cortinellus shiitake (mushroom) and Pholiota nameko (mushroom), the growth of the hyphae of the mushrooms is remarkably promoted and also good yields and qualities of Cortinellus shiitake and Pholiota nameko can be attained. |
