Water shortage worldwide is calling for efficient technologies for water purification and reuse. A new process combined pressure assisted osmosis (PAO) and low pressure reverse osmosis (LPRO) was instructed to achieve simultaneous wastewater reuse and seawater desalination. The operating conditions of PAO and LPRO were optimized. Excitation-emission matrix (EEM) spectroscopy and gel permeation chromatography (GPC) were used to investigate the changes of molecular weight distribution (MWD) of organic matters in the hybrid process. Results indicated that water flux was proportional to the pump pressure, and reverse salt flux decreased with the pressure decreasing in single PAO process. Severe permeate flux and salt rejection declination were observed when high concentration NaCl was used as influent in single LPRO process. In hybrid PAO-LPRO process, permeate flux significantly increased compared with single LPRO process and product water had high quality according to the results of EEM spectroscopy and MWD analysis. Salt rejection and removal efficiency of total organic carbon were 97.8% and 98%, respectively. Membrane fouling was moderate and could be removed by simple physical cleaning when secondary sedimentation tank effluent (SSTE) from wastewater treatment plant was used as feed solution and seawater from Hangzhou bay as draw solution.

世界范围内的水资源短缺正在要求高效的技术用于水的净化和回用。指导了一种结合了压力辅助渗透（PAO）和低压反渗透（LPRO）的新工艺，以实现废水的同时回用和海水淡化。优化了PAO和LPRO的操作条件。利用激发-发射矩阵（EEM）光谱和凝胶渗透色谱（GPC）研究了混合过程中有机物的分子量分布（MWD）的变化。结果表明，单PAO过程中水通量与泵压成正比，反盐通量随压力的降低而减小。当在单个LPRO工艺中使用高浓度的NaCl作为进水时，观察到严重的渗透通量和脱盐率下降。在混合PAO-LPRO过程中，根据EEM光谱和MWD分析的结果，与单一LPRO工艺相比，渗透通量显着增加，并且产水质量较高。总有机碳的除盐率和去除效率分别为97.8％和98％。当污水处理厂的二次沉淀池出水用作进料溶液，杭州湾的海水作为抽出溶液时，膜污染程度适中，可以通过简单的物理清洗将其去除。