| 摘要 |
<p>PURPOSE:To enhance the efficiency of anaerobic digesting reaction, by anaerobically digesting highly-concentrated organic waste water in a first digesting vessel, concentrating digestive fluid from the first digesting vessel with a centrifugal concentrator, and returning the concentrated liquid to the first digesting vessel. CONSTITUTION:Highly-concentrated organic waste water (a) such as night soil is anaerobically digested in a first digesting vessel 1, the resulting digestive fluid is concentrated by a centrifugal concentrator 2 without being brought into contact with oxygen in air, and at least a part of the concentrated liquid is returned to the first digesting vessel 1 while the remainder is discharged as excess sludge (e). As a result, a condition in each vessel comes to the optimum for digestion, so that the efficiency of digestion is remarkably improved. Consequently, the method can be applied for difficulty decomposable stroma-contg. waste water or highly-loaded operation, and the reduction of the total volume can make the size of installation small.</p> |
