加州圣迭戈市于1998年10月获得填海局的拨款，以调查使用膜生物反应器（MBR）进行水回收的可行性。根据项目第一阶段的调查结果，项目团队得出结论，需要在试验规模上对商用MBR系统进行平行比较。Zenon Environmental systems，Inc.和三菱人造丝公司制造的两个浸没式MBR系统在加利福尼亚州斯科迪多的Aqua 2000研究中心进行了评估。该项目旨在评估使用MBR渗透水处理城市污水作为薄膜复合反渗透（RO）膜的进料源的可行性。 该项目的第一部分致力于以硝化和反硝化模式运行MBR。项目第一部分完成后，对两个MBR系统进行了改造，并以仅硝化模式运行。在整个研究的两个部分中，每个MBR的流出物都被送入两个单独的单级反渗透中试系统。Zenon和Mitsubishi MBR系统均表现出较高的生物需氧量（BOD）去除率，其值低于检测限，且总有机碳（TOC）显著降低。MBR的出水浊度始终小于0.1 NTU。两种MBR也产生了高质量的废水，可用于薄膜复合反渗透膜。 尽管MBR系统在研究的所有阶段都没有显示无机氮的去除，但更好的系统设计会提高去除率。包括9个参考文献、表格、图表。

The City of San Diego, California, was awarded a grant in October 1998 from theBureau of Reclamation to investigate the feasibility of using membranebioreactors (MBRs) for water reclamation. Based on the findings of the firstphase of the project, the project team concluded that a parallel comparison ofcommercially available MBR systems needed to be evaluated at pilot-scale. Twosubmerged MBR systems, manufactured by Zenon Environmental Systems, Inc. andMitsubishi Rayon Corporation, were evaluated at the Aqua 2000 Research Center inEscondido, California. The project was designed to evaluate the feasibility ofusing MBR permeate treating municipal wastewater as a feed source for thin filmcomposite reverse osmosis (RO) membranes. The first part of the project wasdedicated to operating both MBRs in a nitrification and denitrification mode.After completion of Part 1 of the project, both MBR systems were retrofitted andoperated in a nitrification only mode. Throughout both parts of the study, theeffluent from each MBR was fed to two separate, single stage RO pilot systems.Both the Zenon and Mitsubishi MBR systems showed high biological oxygen demand(BOD) removal with values below the detection limit, and significant totalorganic carbon (TOC) reduction. The effluent turbidities from the MBRs wereconsistently less than 0.1 NTU. Both MBRs also produced a high quality effluentthat could be used by thin film composite RO membranes. Although the MBR systemsdid not show inorganic nitrogen removal at all points of the study, a betteraeration system design would have improved removals. Includes 9 references, table, figures.