地下水基本没有悬浮物,污染指数SDI低,比较适宜做反渗透的水源,但硬度高,容易引起反渗透膜结垢,故地下水反渗透除盐,预处理的重点是防止膜表面结垢。软化法预处理操作繁琐,设备复杂,讨论了在地下水中加入阻垢剂防止反渗透膜表面结垢的方法,结果表明此法有效可行。

The groundwater has a little suspended particles and low SDI. It is suitable for the waterhead of reverse osmosis. The groundwater has high hardness, and it easily brings the membrane scaling. Thus the key process of the reverse osmosis pretreatment for the groundwater is preventing scaling. The operation is fussy and the equipment is complicated for the softening process of pretreatment. The injecting of the antiscaling agent into the groundwater can efficiently prevent the membrane from scaling on its surface.