| 摘要 |
<p>PURPOSE:For efficiently and cheaply treating surplus sludge to minimize disposed amount, the surplus sludge is treated physically or chemically to destroy their microbe cells for nutrient. CONSTITUTION:Returned sludge is partly taken as surplus sludge and introduced into the decomposition bath 7 through line 6. In the bath 7, physical means such as ultrasonic wave and mixer, or chemical means such as ozone gas is used to destroy microbe cells constituting suspension in the surplus sludge. This transforms the surplus sludge into organic solvent, which is sent through line 8 to the aerobic digestion bath 9. In this bath 9, the organic solvent and active sludge is mixed while being exposed to air, thereby to cause the active sludge to take the solvent in as nutrient. The process is cheap, efficient and simple to operate, reducing the disposed sludge.</p> |
