一旋流沉砂器作用：
由于叶轮桨板向上倾斜，旋转时使池中污水作螺旋运动，加上因污水切向进入，产生与叶轮旋向一致的旋流，池中的污水形成涡螺流态。在适当的叶桨倾角和线速度条件下，污水中的砂粒将受到冲刷并仍保持较佳的沉降效果，而原来附着在砂粒上的有机物以及重度小的物质将随污水一同流出旋流池。另外，由于叶轮旋转，减少了旋流池因进水量变化导致流态变化的敏感程度，保证了沉砂池稳定、出砂的有机成分含量低等特点。
二、优点
1、结构简单、无易损件、经久耐用、减少维修。
2、运行稳定、容易操作。
3、动力少、节约能源。
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