Abstract: An oil-water separation method to separate oil-contaminated water into clean, filtered water for use. The method comprises filtering prefiltered, coalesced oil-water in an oleophobic depth-type filter.

Abstract: An oil-water separator system and method to separate contaminated oil and water into clean water and free coalesced oil for collection and removal. The system includes a process tank for the oil and water, a pump to pump the oil and water through first and second stage oil-coalescing filters and through a full depth, fibrous filter under back pressure to provide filtered clean water of selected purity; typically, less than 20 ppm. The coalesced and filtered oil-water is returned and recycled to the process tank wherein a free coalescing oil layer forms on the surface, which free coalesced oil is removed by a belt skimmer for collection and removal.

Abstract: A membrane filter which comprises a porous, self-supporting, end axially-compressible filter tube, and a microporous membrane sheet bonded to the external surface of the filter tube, the membrane sheet overlapping the one and other ends of the filter tube and extending across the full edge width at the ends to provide a membrane filter to seal into a housing by axial compression without the need for gaskets, end caps or adhesives. A method of preparing a membrane filter tube, which method comprises securing a microporous membrane to the external surface of a self-supporting, axially compressible filter tube and overlapping and securing the ends of the membrane across the ends of the full edge width of the filter tube.