压力协同渗透和反渗透联合处理再生水特性研究

Study on the Effect of Pressure on PAO and the Characteristics of the Joint Treatment of Reclaimed Water with RO

分别研究了压力协同渗透（PAO）和反渗透（RO）运行过程，在此基础上分析了PAO—RO组合工艺处理再生水的特性，并采用凝胶色谱分析了处理过程中相对分子质量的分布变化情况。结果表明，正渗透（FO）膜结构性能测试过程中，使用网格垫片时，FO膜的纯水渗透系数A和盐渗透系数B均有增加，且随着压力增加而增加。在单一PAO过程中，纯水通量与压力成正相关，盐返混通量成下降趋势。以二沉出水为原料液，海水为汲取液，采用PAO—RO联合工艺，运行12h后，系统产水量较单独RO工艺增加约150％，海水脱盐率达到94．8％，对二沉出水TOC的去除率达到99％以上，出水相对分子质量主要分布在80-500。

In this study, the operating process of pressure assited osmosis （PAO） and reverse osmosis （RO） were studied, and on this basis, the characteristics of reclaimed water processed by PAO-RO combination process was analyzed, and the molecular weight distribution was also analyzed using gel permeation chromatography. The results showed that： the pure water permeability coefficient A and salt permeability coefficient B of FO membrane were both increased with the increase of pressure, during the test of performance of the membrane structure while using spacer support. In a single PAO process, Jw was positively related to the pressure, and the J~ was decreased. When the secondary effluent was feed solution, and seawater was draw solution, the combined process of PAO-RO was used. After the process run 12 h, the water production capacity of the system increase by about 150% than single RO process, and the seawater desalination rate, TOC of secondary effluent water removal rate reached to 94.8%, more than 99% respectively, and relative molecular mass of effluent was mainly distributed ranged from 80-500.