德克萨斯州麦卡伦市，在CH2M希尔和 美国复垦局（BOR）电力公司联合赞助 该研究所和德克萨斯州水资源开发委员会已经对一项 集成膜生物反应器（MBR）/反渗透（RO）处理机组 回收城市污水，使其质量适合用作新的饮用水 供水过程称为间接饮用水再利用。之前的测试由 该市（1期）展示了微滤的适用性和成本 （Memcor和ZeeWeed系统）以提高二级出水的质量 反渗透后续处理及膜生物反应器系统的可行性 （ZenoGem）直接从最少处理的污水中产生反渗透给水。阶段 本文报道的2项测试旨在证明 经过筛选、除雾的污水，MBR和RO工艺的可靠运行 这样一列火车排出的废水可以满足联邦和州的所有要求 二次饮用水法规和符合国家要求的 间接饮用水再利用。结果表明，ZenoGem工艺可靠，要求 将操作员的注意力和维护降至最低，产生的废水 通过反渗透处理，几乎没有污垢，这很容易超过城市的电流 与生物需氧量（BOD）相关的废水排放要求，总量 悬浮固体（TSS）和氨。ZenoGem渗透质量超过RO 浑浊度和泥沙密度指数及反渗透系统的给水标准 性能证明，颗粒对膜的污染最小。然而，高 城市污水中的钙硬度和磷酸盐水平（和ZenoGem） 渗透）在温度下运行时，在反渗透系统内引起矿物沉淀 更高的回收率。然而，降水可以通过增加降水量来控制 反渗透给水酸化。包括2个参考文献、表格和图表。

The City of McAllen, Texas, with the assistance of CH2M HILL and the co-sponsorship of the United States Bureau of Reclamation (BOR), Electric Power Research Institute, and the Texas Water Development Board, has pilot tested an integrated membrane bioreactor (MBR)/reverse osmosis (RO) treatment train to reclaim municipal wastewater to a quality suitable for use as a new drinking water supply in the process called indirect potable reuse. Previous testing by the City (Phase 1) demonstrated the applicability and cost of microfiltration (Memcor and ZeeWeed systems) to enhance the quality of secondary effluent for subsequent treatment by RO and the feasibility of a membrane bioreactor system (ZenoGem) to produce RO feedwater directly from minimally processed sewage. Phase 2 testing, reported on in this paper, is designed to demonstrate, when treating screened, degritted sewage, reliable operation of both the MBR and RO processes and that the effluent from such a train can meet all federal primary and state secondary drinking water regulations and comply with state requirements for indirect potable reuse. Results show the ZenoGem process to be reliable, require minimal operator attention and maintenance, produce an effluent that can be processed by RO with little fouling and that easily exceeds the City's current effluent discharge requirements relative to biological oxygen demand (BOD), total suspended solids (TSS), and ammonia. The ZenoGem permeate quality exceeds RO feedwater criteria for turbidity and silt density index and the RO system performance confirms minimal membrane fouling by particles. However, the high calcium hardness and phosphate levels in the City's wastewater (and ZenoGem permeate) caused mineral precipitation within the RO system when operated at higher recoveries. Precipitation can be controlled, however, by increased acidification of the RO feedwater. Includes 2 references, tables, figures.