Process changes can be considered to reduce the amount of chips generated or oils that end up in the
hoppers before being emptied into the roll off boxes.
Reuse oils by circulating them back into the system. For more information refer to the Shane Steel Case
Study, developed by Shane Steel in cooperation with the Retired Engineer Technical Assistance
Program.
A primary problem in metal working fluid management is contamination with tramp oil and the problems
that result from this. While the best solution for tramp oil problems is to prevent the oils from entering the
metal working fluid, some contamination will occur as the machines and their oil seals and wipers wear.
This can be reduced through preventative maintenance such as periodic seal and wiper replacement.
Depending upon site specific conditions, optional metal working fluid performance may be enhanced with
the following source reduction options:
? Use high quality, stable metalworking (grinding and cutting) fluids that are most
suitable for the particular application.
? Use demineralized water for mixing purposes.
? Control the fluid concentrations and chemistry (pH, dissolved oxygen, etc.) and
consider adding biocides to extend the fluid life, by combating microbe growth.
? Periodically clean the sump and machine.
? Inspect and maintain the gasket, wiper and seals to minimize tramp oil contamination.
? Clean the metalworking fluid through filtering (bag, cartridge or disc filters) and
clarification, chip wringers, or centrifugation, to minimize microbe growth by controlling
tramp oil buildup.
? Assign fluid control responsibility to one person. Consider working with a pollution prevention engineer to evaluate whether any of these options would be
useful at your facility.
In addition to the above, evaluate the feasibility of these recycling options for metalworking fluid:
? Filtration of metalworking fluids
? Skimming
? Coalescing
? Hydrocycloning
? Centrifuging
? Pasteurization
? Downgrading
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