超滤+反渗透”工艺在污水厂再生水处理中的应用

Application of "Ultrafiltration + Reverse Osmosis" Process in Reclaimed Water Treatment of WWTP

摘要:

作为有效缓解水资源短缺和实现“双碳”目标的重要举措,污水再生利用将是我国水处理行业的主要热点之一。现阶段,我国再生水利用率较低,很多污水处理厂设计时未考虑污水再生利用。本文以上海某污水处理厂为例,其在市政污水厂再生水设计时创新采用“超滤+反渗透”工艺,达到工业净水标准后回用,实现厂内自用水的自给自足,以期为同类型污水厂再生水设计提供可参考借鉴的解决方案。工程再生水设计规模5000m3^/d,超滤膜采用孔径为0.02μm的中空纤维膜,设计膜通量≤55L/(m2^{? h),}设计回收率≥90%；反渗透膜采用卷式膜组件,设计系统回收率≥70%。工程第一部分投资为2091.17万元,单位运行成本为1.33元/m3^。

Abstract:

In recent years, the sewage recycling has attracted more and more attention in the industry. At this stage, there is no consideration to use the sewage recycling in the design of wastewater treatment plant (WWTP) in China. Taking a WWTP of Shanghai as an example, the "ultrafiltration + reverse osmosis" process is innovatively adopted in the design of reclaimed water of the municipal WWTP. After reaching the industrial water purification standard, the reclaimed water can achieve the self-sufficiency in water use within WWTP in order to provide the reference for the design of reclaimed water in the similar WWTPs. The design scale of reclaimed water in the project is 5 000 m3/d. The ultrafiltration membrane is the hollow fiber membrane with a pore size of 0.02 μm. The designed membrane flux is not larger than 55 L/(m2·h). The designed recovery rate is not less than 90%. The spiral-wound membrane component is used for the reverse osmosis membrane. The design system recovery rate is not less than 70%. The first part of the investment for the project is RMB 20.911 7 million yuan. The unit operating cost is 1.33 yuan/m3.