本发明公开了一种污水处理系统，所述系统包括：海水淡化单元，所述海水淡化单元将海水进行淡化处理形成淡化水和浓盐水；淡化水使用单元，所述淡化水使用单元接收所述淡化水供用户使用；污水预处理单元，所述污水预处理单元输出预处理后的污水；正渗透单元，所述正渗透单元接收所述预处理后的污水和所述浓盐水，处理后输出淡盐水和劣质水；其中所述淡盐水进入所述海水淡化单元进行处理；劣质水消纳单元，所述劣质水消纳单元接收所述劣质水并进行处理。解决了常规水处理无法满足环保标准，而深度水处理成本很高，造成污水回收利用率低的技术问题。实现了高盐、难处理污水的高效利用及零排放，提高污水回收利用率，减少工业淡水外购量的技术效果。

The present invention discloses a sewage treatment system. The system includes a seawater desalination unit that desalinates seawater to form desalinated water and concentrated brine. A desalinated water using unit receives the desalinated water for users. A sewage pretreatment unit outputs pretreated sewage. A forward osmosis unit receives the pretreated sewage and the concentrated brine, and outputs after treatment water and poor-quality water, wherein the brackish water enters the seawater desalination unit for processing. A poor-quality water absorption unit receives and processes the poor-quality water. It solves the technical problem that conventional water treatment cannot meet environmental protection standards, and the cost of advanced water treatment is high, resulting in low sewage recycling rate. The technical effects of high-salinity, difficult-to-treat sewage's high-efficiency utilization and zero discharge have been realized. Thus, the sewage recycling rate has been improved, and the industrial fresh water purchased has been reduced.