2005年末，拉辛水务公司成功调试了一台50 MGD的运行 浸入式超滤（UF）膜装置。随着公用事业员工和其他利益相关者的利益 对这一全新治疗过程的操作经验和洞察力，各种 改进已安装系统和拟议操作程序的机会 变得明显和必要。这些改进减少了膜污染，减少了 化学清洗成本降低，能源成本降低，处理能力提高。本文 介绍了Racine超滤设施持续改进的结果。 2008年，Racine的工作人员进行了一项全面的测试计划，以评估 将预处理混凝剂从硫酸铁转化为聚合氯化铝以还原铁 膜污染。测试结果表明，膜性能显著改善 渗透性，降低跨膜压力，降低渗透泵能耗，以及 延长化学清洗现场间隔。 几个月的全面测试也支持降低膜的频率 氯维护从每天到每周进行清洁，对膜性能没有影响。 这种改进将次氯酸钠化学成本降低了近50%，并增加了 系统的每日生产时间和净渗透能力。 膜供应商和公用设施工作人员都对调试的膜进行了物理修改 膜系统在前两年的运行中大大改善了运行。 对真空预充系统的修改减少了执行该状态所需的时间 需要每天进行3次完整性测试，从而增加了每台机器的每日净生产时间 薄膜列车运行时间接近1小时。 此外，对渗透真空系统进行了改造 降低了电气成本，减少了预防性维护活动和成本。另外 标准操作程序和PLC编程的更改降低了污垢率和 减少了系统警报和警告。包括数字。

In late 2005, the Racine Water Utility successfully commissioned operation of a 50 MGD immersed ultrafiltration (UF) membrane plant. As utility staff and other stakeholders gained experience and insight into the operation of this completely new treatment process, various opportunities to improve on the installed system and on the proposed operation procedures became apparent and necessary. These improvements have reduced membrane fouling, reduced chemical cleaning costs, reduced energy costs and have increased treatment capacity. This paper presents the results of the on-going improvements to the Racine UF facilities. During 2008, Racine staff conducted a full-scale testing program to evaluate the impact of converting the pretreatment coagulant from ferric sulfate to polyaluminum chloride to reduce iron fouling of the membranes. Testing results demonstrated a significant improvement in membrane permeability, reduced trans-membrane pressure, lowered permeate pump energy use, and lengthened chemical clean-in-place intervals. Full-scale testing over several months also supported decreasing the frequency for membrane chlorine maintenance cleans from daily to weekly with no impact to the membrane performance. This modification has reduced sodium hypochlorite chemical costs by nearly 50% and increased daily production time and net permeate capacity for the system. Both the membrane supplier and utility staff made physical modifications to the commissioned membrane system during the first two years of operation to substantially improve operations. Modifications to the vacuum prime system has reduced the time required to perform the State required 3/day integrity testing, thereby increasing the daily net production time for each membrane train by close to 1 hour. In addition, revamping of the permeate vacuum system lowered electrical costs and reduced preventative maintenance activities and costs. Other changes to standard operating procedures and PLC programming have lowered fouling rates and reduced system alarms and warnings. Includes figures.