渗透汽化复合膜分离废水中的低浓度甲醇

采用两种商品化渗透汽化复合膜--GKSS-GS膜和PDMS-P膜分离模拟低浓度甲醇废水,考察了操作温度、甲醇质量分数、废水流量对膜渗透汽化性能的影响.实验结果表明:随温度升高、废水中甲醇质量分数的增大,两种膜的渗透通量都呈增加趋势;GKSS-GS膜的分离系数变化较明显,而PDMS-P膜的分离系数变化较小;废水流量对渗透通量和分离系数的影响均较小.在最佳条件下,GKSS-GS膜的渗透通量为914.6 g/(m~2·h),分离系数为5.6;PDMS-P膜的渗透通量为1 887.2 g/(m~2·h),分离系数为4.8.

Separation of Low-concentration Methanol from Wastewater Using Pervaporation Composite Membrane

The effects of operation temperature, methanol mass concentration and wastewater flow on pervaporation were studied by using two kinds of commercial pervaporation composite membranes, membrane GKSS-GS and membrane PDMS-P, and the simulated wastewater with low-concentrated methanol. The experimental results show that: With the increasing of temperature and methanol mass fraction, the permeation fluxes of the two membranes are both increased; The separation coefficient of membrane GKSS-GS is changed notably, while that of membrane PDMS-P is less changed; The wastewater flow has little effects on the permeation flux and the separation coefficient. Under the optimum conditions, the permeation flux and separation coefficient of membrane GKSS-GS are 914.6 g/(m~2·h) and 5.6, respectively; and the permeation flux and separation coefficient of membrane PDMS-P are 1 887.2 g/(m~2·h) and 4.8, respectively.