Treatment system and treatment method for wastewater containing methanol and propylene glycol

The invention provides a treatment system and a treatment method for wastewater containing methanol and propylene glycol, and the system comprises a buffer tank, a raw material-residual liquid heat exchanger, a feed heater, a membrane separation unit, a residual liquid cooler and a permeate cooler. The method is simple in operation, the obtained permeate liquid is low in impurity content and can be recycled, the residual liquid is low in moisture content and good in separation effect, methanol and propylene glycol can be concentrated and recycled, and the method is suitable for treatment of wastewater containing methanol and propylene glycol in a large concentration range. 本发明提供了一种含甲醇和丙二醇废水处理系统及处理方法，所述系统包括缓冲罐、原料-残留液换热器、进料加热器、膜分离单元、残留液冷却器和透过液冷却器，本发明中的处理系统及方法能够高效实现含甲醇和丙二醇废水中水的分离，得到的透过液杂质含量少，能够进行回收利用，而残留液中水分含量低，分离效果好，并且能够对甲醇和丙二醇进行浓缩再利用，适用于大浓度范围内的含甲醇和丙二醇废水的处理。