Reverse Osmosis Modelling

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Abstract

Successful operation and maintenance of reverse osmosis (RO) systems in ultrapure water (UPW*) production is critical, as RO is typically the first major step in ionic and organic contamination removal. While performance equations for the monitoring of simple RO schemes are well developed, many RO systems are composed of multiple trains with several stages, to which equations in most available literature cannot directly be applied. At a semiconductor plant in Burlington, Vt., a method for deriving performance equations for multi-stage RO systems was developed. The equations applied were most effective when presented in an intuitive and action-oriented format, which led to the ﾓdashboardﾔ approach described in this article. Using this technique, the plant in this study increased its overall system water recovery from 80% to 85% without sacrificing product quality or membrane condition.

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