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Ultrafiltration to Remove Oil

A company recently purchased an ultra filtration system to remove oil from a
combined wastewater stream of water soluble machine coolants, floor mop
water, and water from buckets used for rinsing chips from parts. Company
machines primarily aluminum and iron, maybe 95%. Minimal amounts of brass
and no stainless or plated products are machined.

The vendor who supplied the company supposedly ran samples of the combined
spent coolants and wastewater through the same system prior to purchase of
equipment and supposedly could deliver wastewater at 20-50mg/l oil
remaining. After purchasing the system the company and vendor have not been
able to get the wastewater below 500mg/l. Several things have been tried,
segregating wastewater streams and running them separately, new membranes of
a different type and so on.

The company uses city tap water instead of DI water for coolant mixing.
Could the City water cause interference with the membranes because of
chlorination or minerals in the tap water?

How critical is pH range?

I'm aware of several other technologies that will work but company would
like to use what they have bought if possible.

Any ideas, suggestions appreciated.


Jack Annis, Co-Director
Solid and Hazardous Waste Education Center
College of Natural Resources
UW-Stevens Point
Tel 715-346-2793
Fax 715-346-3624