| 摘要 |
<p>PURPOSE:To improve the sticking of microbes and to improve the cleaning up efficiency for sewage by forming a catalyst for contact cleaning up, by using a mixture of aggregate and hydraulic cement and forming the same into spherical bodies of 5-80mm. diameter and 1.2-2.0 apparent specific gravity. CONSTITUTION:80kg the fly ash (2,300cm<2>/g blain specific surface area and 2.13 apparent specific gravity) produced from a thermal power plant is used as aggregate and 20kg Portland cement is added as hydraulic cement thereto. The mixture thereof is charged into a pan pelletizer and is granulated under addition of water, whereby 118kg spherical media of 5-40mm. diameter and 1.85 apparent specific gravity are obtd. In the case of using the same for cleaning up sewage, said spherical media are packed in, for example, a cleaning up tank 1 to 25% void volume to form a medium layer. Sewage is fed into the tank through a sewage feed port 4, and after compressed air is blown therein through an air blow port 5, the cleaned-up water is discharged through an outlet 6.</p> |
