Use of an Ultrafiltration Unit in a Closed Loop Aqueous Cleaning System. 1997.

TURI Technical Report No. 41. The intent of this research was to evaluate the potential of ultrafiltration (UF) to successfully "close the loop" for different aqueous cleaning applications. The evaluation was based on data obtained from experimental work in which a variety of cleaner/contaminant test solutions were processed through three membranes of different types and pore sizes. This project also included researching and reporting on aqueous cleaner compositions and contaminants commonly encountered in aqueous cleaning. A qualitative evaluation of the recyclability of different cleaner/contaminant solutions based on oil-surfactant tradeoff was performed. The research implied that any of the three membranes studied is capable of successfully recycling aqueous cleaning baths containing hydrocarbon oil-based contaminants. However, UF did not appear to be wellsuited for recycling aqueous cleaning baths containing synthetic contaminants. In addition, the research further validated equations developed to describe flux and flux decline in UF.

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