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反渗透设备膜组件应用注意事项

2012-5-23 14:47:39      点击:

反渗透设备膜组件应用注意事项
反渗透设备渗透压是水中所含盐分或有机物浓度的函数,含盐量越高渗透压也增加,进水压力不变的情况下,净压力将减小,产水量降低。透盐率正比于反渗透膜正反两侧盐浓度差,进水含盐量越高,浓度差也越大,透盐率上升,从而导致脱盐率下降。对同一系统来说,给水含盐量不同,其运行压力和产品水电导率也有差别,给水含盐量每增加l00ppm,进水压力需 增加 约 0 .007MPa,同时由于浓度的增加,产品水电导率也相应的增加。 水中的悬浮物就是指在水滤过的同时,在过滤材料表面残留下的物质,以粒子成分为主体。悬浮物含量高会导致反渗透和纳滤系统很快发生严重堵塞,影响系统的产水量和产水水质。

 各种反渗透设备膜组件都有一个允许的pH值范围,进水pH值对产水量几乎没有影响;但是即使在允许范围内, PH值 对脱盐率 也 有较大影响,一方面pH值对产品水的电导率也有一定的影响,这是因为反渗透膜本身大都带有一些活性基团,pH值可以影响反渗透设备膜表面的电场进而影响到离子的迁移,pH值对进水中杂质的形态有直接影响,如对可离解的有机物,其截留率随pH值的降低而下降。

  回收率对各段压降有很大的影响,在进水总流量保持一定的条件下,回收率增加,由于流经反渗透设备高压侧的浓水流量减少,总压降降低,回收率减少,总压降增大,实际运行表明,回收率即使变化很小,如1%,也会使总压差产生0.02MPa左右的变化。由于水中溶解的CO2受pH值影响较大,pH值低时以气态CO 2 形式存在,容易透过反渗透膜,所以pH低时脱盐率也较低,随pH升高,气态CO 2 转化为HCO 3 - 和CO 3 2- 离子,脱盐率也逐渐上升,pH在7.5~8.5 之 间 时 ,脱盐率达到最高。回收率对产品水电导率的影响取决于盐透过量和产品水量,一般说来,系统回收率增大,会增加浓水中的含盐量,并相应增加产品水的电导率

  【反渗透设备预处理技术特点】

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