水的硬度对氢离子交换树脂软化处理水的影响

Effect of Water Hardness on Softened Water by Hydrogen Ion Exchange Resin

采用001×7、D001和D61三种氢离子交换树脂进行了不同硬度原水的软化试验,结果表明:原水硬度对处理结果有较大影响,进而筛选出处理不同硬度原水所适宜的氢型树脂和工艺流程。高硬度水(Ca2+720 mg/L,Mg2+240 mg/L)采用D61、001ⅹ7树脂的双级串联离子交换工艺流程,低硬度水(Ca2+120 mg/L,Mg2+70 mg/L)直接用001×7树脂的单级离子交换工艺流程,处理效果较好。吸附等温试验结果表明,高硬度水的吸附既符合Freundlich模型,又符合Langmuir模型,而低硬度水的吸附只符合Freundlich模型。

The softening experiments of waters with different hardness were carried out on three hydrogen ion excharge resins,001 × 7,D001 and D61. Results show the significant effect of the hardness of parent water on softening efficiency. The appropriate H-type resin and softening process were screened for the waters with different hardness. Satisfying softening results were ob- tained for high hardness water （Ca^2＋ 720 mg/L,Mg^2＋ 240 mg/L） by adopting D61 and 001 × 7 two-stage series ion exchange process,and for low hardness water （Ca^2＋ 120 mg/L,Mg^2＋ 70mg/ L） by adopting 001 × 7 one-stage ion exchange process. Isothermal adsorption results indicate that the adsorption of high hardness water accords with both Freundlich model and Langmuir Model, while the adsorption of low hardness water accords only with Freundlich model.