ZERO WASTE ("Ø" WASTE™) involves these simple operations:
REMOVAL OF TRAMP OIL
FILTRATION TO REMOVE METAL FINES
TESTING FOR CONCENTRATION AND BIOLOGICAL ACTIVITY
TREATMENT AND/OR MAKEUP
RECORD WHAT WAS DONE
FILTRATION
How long to filter---A good rule is to pass the volume of the sump through the filter unit 15-18 times. This means that for a 100 gallon sump, using a 10 gpm unit, filter for 150 minutes; for a 50 gallon sump, 75 minutes, etc;.. Of course, it doesn’t hurt anything to let the filter work longer.
When to change the filter bag---As the media loads up, the vacuum will increase. This indicates that the pump is having to work harder to move the fluids through the filter. When the gauge reaches 15 inches of mercury, or when the movement of fluid is reduced to near zero, it is time to change the filter bag. On electric models, the vacuum safety switch will shut the unit down at this point.
TESTING AND TREATMENT
Add chemicals to a metalworking sump only as a result of an analytical test. Normally, the only things ever added to a sump are makeup coolant (or water) as a result of the concentration test; and, a stabilizing agent administered as a result of the HMB test.
To decide when to add stabilizer, one first establishes a baseline. To do this, run the HMB for a few weeks (2-5 times per week), and record the readings. The readings will vary from shop to shop and even from sump to sump within the same shop. However, typical readings will be below 5.0 for machining operations. It is when the readings depart from the baseline (say, by a factor of two) that one adds stabilizer. When addition of stabilizer is indicated by the test results, always add the same dosage of MARK II Stabilizer (one pint per 60 gallons unless otherwise instructed).