Composite membrane element suitable for water different in quality and manufacturing method

The invention discloses a composite membrane element suitable for water different in quality and a manufacturing method. The element includes a central tube, a reverse osmosis membrane assembly and ananofiltration membrane assembly. The reverse osmosis membrane assembly includes a reverse osmosis membrane, a dense water flow path cloth of the reverse osmosis membrane assembly and a pure water flow path cloth. The nanofiltration membrane assembly includes a nanofiltration membrane, a dense water flow path cloth of the nanofiltration membrane assembly and a pure water flow path cloth. This composite membrane element has a wide range of application, ensures healthy water drinking and no scaling, and has a high flux, the rejection rate of calcium and magnesium ions is higher than that of a single nanofiltration membrane, and the service lifetime of the composite membrane element is effectively prolonged. 本发明公开了一种适用于不同水质的复合膜元件及制作方法，该元件包括一个中心管、一个反渗透膜组和一个纳滤膜组，反渗透膜组包括一反渗透膜片、一反渗透膜组的浓水流道布和一纯水流道布，纳滤膜组包括一纳滤膜片、一纳滤膜组的浓水流道布