有两种主要的低压膜选择，可以作为 用于水回收的反渗透（RO）预处理。这两种选择包括:治疗 使用膜生物反应器（MBR）处理未经处理的废水；以及二级污水的处理 来自使用三级膜过滤的传统活性污泥（CAS）工艺 （TMF）。要考虑的最重要的方面之一是 这两种低压膜技术产生的渗透液质量， 这种比较是这项工作的重点。 在加拿大圭尔夫的一座大型污水处理厂（WWTP）进行了两次试点。第一个中试使用MBR将未经处理的废水送入工厂。 第二个试点从全规模工厂的二级工艺中提取废水，并 用TMF治疗。本文给出了两个并联系统的运行参数。如图所示 处理系统的膜组件非常相似；然而，生物 处理系统的组成有很大不同。包括2个参考文献、表格和图表。

There are two main low-pressure membrane options that can be implemented as pretreatment for reverse osmosis (RO) for reclamation of water. These two options include: treatment of raw wastewater with a membrane bioreactor (MBR); and, treatment of secondary effluent from a conventional activated sludge (CAS) process using tertiary membrane filtration (TMF). One of the most important aspects to consider is the quality of permeate that is produced by these two low-pressure membrane technologies, and this comparison is the focus of this work. Two pilots were operated at a full-scale wastewater treatment plant (WWTP) in Guelph, Canada. The first pilot treated raw wastewater fed to the plant using a MBR. The second pilot drew effluent from the secondary process at the full-scale plant and treated it using TMF. The paper provides the operational parameters of the two parallel systems. As shown, the membrane components of the treatment systems are very similar; however, the biological components of the treatment systems are significantly different. Includes 2 references, tables, figures.