明尼阿波利斯水厂（MWW）一直在进行长期超滤 未来70 mgd哥伦比亚高地膜过滤装置的膜研究 自2001年5月以来。前6个月的膜测试是 投标中使用了CHMFP膜采购和性能数据 评估过程。合同授予后，选定的膜供应商， Ionics公司在现场保留了试验设备，以便继续进行长期试验 膜测试程序。该测试计划将持续到完成 2006年CHMFP的建设。该项目的主要目标是 评估不同水质条件下膜性能的变化 在四年的时间里。 各种操作问题，如低温 此外，还讨论了生产、灵活性和膜清洗制度的优化 计划在本项目中进行调查。本文主要研究的是突然的、过度的 春季径流季节观察到的膜污染现象。虽然 在过度污染事件期间，膜渗透性仍然高于 CHMFP的设计目的是，MWW了解这一点很重要 不寻常的污垢。此外，确定有效的清洁或预防措施 可用于在全尺寸工厂中处理此类事件是非常可取的。大量的 业主（MWW）、咨询工程师（HDR/MP/SPI）和 膜供应器（Ionics/Norit）被纳入了对污染的广泛研究中 识别和膜渗透性恢复方法。包括表格、数字。

The Minneapolis Water Works (MWW) has been conducting long-term ultrafiltration membrane studies for its future 70-mgd Columbia Heights Membrane Filtration Plant (CHMFP) since May 2001. The first 6 months of membrane testing was a component of the CHMFP membrane procurement and the performance data was used in the bid evaluation process. After the contract was awarded, the selected membrane supplier, Ionics, retained the pilot equipment onsite for the continuation of the long-term membrane testing program. This testing program is intended to last until the completion of the construction of CHMFP in 2006. The primary objective of this program is to evaluate the variability of membrane performance at different water quality conditions over the course of four years. Various operational issues, such as cold temperature production, flexibility and the optimization of membrane cleaning regime, are also scheduled to be investigated in this project. This paper focuses on the abrupt, excessive membrane fouling phenomena observed during spring-runoff seasons. Although the membrane permeability during the excessive fouling event was still higher than what the CHMFP is designed for, it was important for MWW to understand the nature of this unusual type of fouling. Also, identifying effective cleaning or preventive measures that can be used to handle such an event in the full-scale plant is highly desirable. Substantial collaborative efforts from the owner (MWW), consulting engineers (HDR/MP/SPI), and membrane provider (Ionics/Norit) were incorporated into the extensive studies on fouling identification and membrane permeability recovery approach. Includes tables, figures.