减压膜蒸馏技术浓缩染整废水的研究

Study on Concentration of Dyeing and Finishing Wastewater with Vacuum Membrane Distillation Technology

实验以染整废水为研究对象,通过减压膜蒸馏,浓缩废液,回收纯净水。考虑到染整废水理化性质的不确定性,实验采用配置的模拟溶液。主要研究了单因素对减压膜蒸馏实验结果的影响。结果表明：料液温度、进料流速的增大都会提高膜通量,料液浓度的增大会使得膜通量减小。真空度为0.02 MPa,热侧进水循环流量为450mL/min,热侧进水温度为80℃时,最大膜通量为6kg/（m2·h）,纯净水电导率最低为16μs/cm,符合饮用水标准。实验条件下PVDF纳米纤维膜表现出较强的疏水性,NaOH的截留率在99.9%以上,模拟染整废水杂质截留率在99.9%以上。获得了纯净水,提高了染整废水的处理效率。

In this experiment,dyeing and finishing wastewater was the object of study and purified water was recycled through vacuum membrane distillation and waste liquor concentration.In consideration of uncertainty in physicochemical property of dyeing and finishing wastewater,simulated solution was prepared in this experiment.Mainly the influences of single factors on the result of vacuum membrane distillation experiment was studied.Data shows that：the membrane flux is increasing with the growing temperature of fed liquid and feeding flow rate,but the membrane flux decreases with the growing concentration of fed liquid.When the vacuum degree is 0.02 MPa,the inflow circular flow on hot side is450ml/min,and water inlet temperature is 80 ℃ on hot side,the maximum membrane flux is 6kg/（m2·h）and conductivity of purified water is 16μs/cm.The result conforms to the drinking water standards.In the experimental conditions,PVDF nanofiber membrane showed the strong hydrophobicity,NaOH rejection rate was over 99.9% and the rejection rate of simulated dyeing and finishing wastewater impurities was more than 99.9%.Not only purified water was obtained,but also the treatment efficiency of dyeing and finishing water was enhanced.