预沉（pre-sedimentation）指的是原水泥沙颗粒较大或浓度较高时，在凝聚沉淀前设置的沉淀工序。
本发明公开了一种人工快速渗滤污水处理系统，它由隔栅池、预沉池和快滤池组成。
This invention discloses a manual fast filtering sewage treatment system. It comprises the retainer tank and the fast filtering tank.
制革污水采用预曝气处理后，可大大提高初沉池沉淀效果。
By pre aeration in tanyard wastewater, the effect of primary settling improves obviously.
改善材料的操作性能，与普通的预糊化淀粉相比，施工操作更滑爽、手感轻松、不绵不沉、批厚抹平容易。
Four, improve the operating performance of materials, compared with ordinary pregelatinized starch, the construction operation is more smooth, feel relaxed, not heavy, thick cotton group erase easily.
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