Thanks for the replys.
We understand about the metals. We have delt with that with our waste hauler. There is not much but enough to classify the waste as hazardous.
I believe the sludge that we get is a result of the inert solid materials in the caustic soda. Our polishing process is not...
We evaporate about 200 gal a day of rinse water from an electropolish line. The untreated water has a ph of about 1. We have been adjusting ph to about 5 with caustic soda. it does not take to long to build up a sludge in the bottom of the evaporator that is a problem in a few ways.
Sludge...
