| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cyclone type grit cleaning apparatus for simultaneously achieving a high recovery rate of grit containing fine particles in sewage, a high removal ratio of organic matter contained in grit and the miniaturization of the apparatus. <P>SOLUTION: The grit cleaning apparatus is configured to settle and separate grit in sewage with centrifugal force while jetting a mixture of water and air in a cyclone type solid-liquid separator. In this case, an inner cylinder with a rotary blade is arranged in the internal space of a washed sand cyclone to rotate the inner cylinder side part of sewage during turning so that the turning water flow velocity of sewage can be controlled to easily settle not only grit with normal particle diameters but also fine sand with fine particles. Thus, it is possible to simultaneously satisfy a high recovery rate of grit containing fine particles in sewage and a high removal ratio of organic matter contained in grit and the miniaturization of the apparatus. <P>COPYRIGHT: (C)2013,JPO&INPIT |
