正渗透膜活性层朝向对正渗透过程的影响研究

为了研发和实用化PA正渗透系统，本文通过在线实时监测研究了一种新型聚酰胺（PA）正渗透膜的活性层在朝向料液（Active Layer-facing-Feed Solution ,AL-FS）和汲取液（Active Layer -facing-Draw Solution ,Al-DS）两种模式下的正渗透水通量、反向溶质通量、特性反向通量和脱盐率等四大因素及其变化规律。结果表明：在汲取液浓度较低时，两种模式下的水通量、反向溶质通量大致相当；在汲取液浓度较高时，AL-DS模式的水通量要高于AL-FS模式的水通量，同时，AL-DS模式的反向溶质通量大约是AL-FS模式的反向溶质通量的两倍；在AL-FS模式下的特性反向溶质通量略低于AL-DS模式下的特性反向溶质通量；AL-FS模式下的脱盐率略高于AL-DS模式下的脱盐率。

Study on the Membrane Orientation in FO Process

To pragmatize and develop of the PA penetration system, this study investigated the variation of permeate flux, reverse solute flux , specific reverse solute flux and salt rejection in forward osmosis (FO) process in a new developed polyamide(PA) FO membrane via online real-time monitoring when the membrane orientation is AL-FS and AL-DS mode. It was found that the permeate flux and reverse solute flux of the PA membrane in the AL-DS mode and in the AL-FS mode was approximately equivalent when the draw solution concentration was low. The permeate flux of the PA FO membrane in the AL-DS mode was higher than that in the AL-FS mode and reverse solute flux in the AL-DS mode was almost twice as much than that in the AL-FS mode when the draw solution concentration was high. The specific reverse solute flux of PA membrane in the AL-FS mode was slightly lower than that in the AL-DS mode. The desalination ratio of PA membrane in the AL-FS mode was slightly higher than that in the AL-DS mode.