本幻灯片概述了一个正在扩建的小型水系统常规处理厂的膜改造项目。演讲大纲包括: 需要对水厂进行升级和改造 膨胀水源与处理 挑战； 治疗方案分析； 所选膜的说明 系统设计；和 项目状态。水源和处理方面的挑战包括: 水源是科苏门河， 只有在冬季才允许撤军； 三个小湖的原水储存 支持大量水生植物； 湖源浊度低，但 提高了总有机碳（TOC）；和 平均碱度 小于60毫克/升。治疗 挑战包括: 水源的总溶解固体（TDS）和 浑浊度； 湖泊中的水生植物增加了总有机碳； 锰可以存在于湖泊中；和 铁强化混凝 氯化物达到35%的总有机碳 移动 治疗方案分析: 排除了使用 移动桥滤波器； 备选方案1——常规 絮凝/沉淀双重 媒体过滤器；和 备选方案2——改造发电厂 用浸没的膜。所选项目的说明 膜系统设计: 膜系统容量=5 mgd （固定），总计7.5 mgd，工艺系列 包括 自动反冲洗滤网， 在絮凝池中的接触时间为5分钟， 浸没膜，以及 氯接触盆。

This slide presentation outlines a membrane retrofit project for an expanding small water system conventional treatment plant. The presentation outline includes: need for water plant upgrade and expansion; water source and treatment challenges; treatment alternatives analysis; description of selected membrane system design; and, project status. The water source and treatment challenges include: water source is Cosumnes River, withdrawal allowed only in winter; raw water storage in 3 small lakes that support numerous aquatic plants; lake source is low in turbidity but has elevated total organic carbon (TOC); and, average alkalinity is < 60 mg/L. Treatment challenges include: water source is low in total dissolved solids (TDS) and turbidity; aquatic plants in lakes add TOC; manganese can be present in lakes; and, enhanced coagulation with ferric chloride achieves 35% TOC removal. Treatment alternatives analysis: ruled out expansion using traveling bridge filters; alternative 1 - conventional flocculation/sedimentation dual media filters; and, alternative 2 - retrofit 1970s plant with submerged membranes. Description of selected membrane system design: membrane system capacity = 5 mgd (firm), 7.5 mgd total, process train includes automatic self-backwashing screens, five minutes contact time in floc basins, submerged membranes, and chlorine contact basin.