A Membrane Process for Recycling Die Lube from Wastewater Solutions Page: 3 of 92
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An active-surface membrane technology was used to separate a die lube
manufacturing wastewater stream consisting of various oils, hydrocarbons, heavy
metals, and silicones. The ultrafiltration membranes reduced organics from initial
oil and grease contents by 20-25X, carbon oxygen demand (COD) by 1.5 to 2X,
and total organic carbon (TOC) by 0.6, while the biological oxygen demand
(BOD) remained constant. The active-surface membranes were not fouled as
badly as non-active-surface systems and the active-surface membrane flux levels
were consistently higher and more stable than those of the non-active-surface
membranes tested. Field testing demonstrated that the rotary microfilter can
concentrate the die lube, i.e. remove the glycerin component, and produce a die
lube suitable for recycling. The recycling system operated for six weeks with
only seven cleaning cycles and no mechanical or electrical failures. Test data and
quality records indicate that the die casting scrap was reduced from 8.4 to 7.8%.
There is no doubt that this test yielded tremendous results. This separation
process presents significant opportunities that can be evaluated further.
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Peterson, Eric S.; Trudeau, Jessica; Cleary, Bill; Hackett, Michael & Greene, William A. A Membrane Process for Recycling Die Lube from Wastewater Solutions, report, April 1, 2003; [Idaho Falls, Idaho]. (digital.library.unt.edu/ark:/67531/metadc890987/m1/3/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.