本文在加利福尼亚州El Segundo的一家水回收厂对全尺寸常规预处理和全尺寸微滤预处理进行了比较。西盆地水回收厂包括三条2.5 mgd反渗透生产线。每列火车都使用醋酸纤维素膜。1号和2号生产线的给水采用常规工艺进行预处理，包括石灰澄清、再碳化和过滤。3号生产线的给水采用微滤进行预处理。将根据生命周期成本和预处理水质对这两种预处理工艺进行评估。 反渗透化学清洗之间的运行时间也将作为两种预处理工艺对反渗透膜影响的替代指标进行评估。将考虑的成本包括:资本成本；操作和维护劳动力；化学品成本；污泥处理和处置；电力成本；更换零件和用品。将考虑的预处理水质参数包括:浊度；SDI；导电性；还有镁。包括表格、数字。

This paper compares full scale conventional pretreatment to full scale microfiltration pretreatment at a water recycling plant in El Segundo, California. The West Basin Water Recycling Plant includs three 2.5 mgd reverse osmosis trains. Each train uses cellulose acetate membranes. Feedwater to Train Nos. 1 and 2 is pretreated using a conventional process consisting of lime clarification, recarbonation, and filtration. Feedwater to Train No. 3 is pretreated using microfiltration. The two pretreatment processes will be evaluated with regard to life cycle costs and pretreated water quality. Run times between reverse osmosis chemical cleanings will also be evaluated as a proxy for the impacts of the two pretreatment processes on the reverse osmosis membranes. Costs that will be considered include: capital costs; operation and maintenance labor; chemical costs; sludge handling and disposal; power costs; replacement parts and supplies. Pretreated water quality parameters that will be considered are: turbidity; SDI; conductivity; and, magnesium. Includes tables, figures.