How does a die lubricant have to be treated in waste water systems?

Water based die lubricants are typically emulsions of oils and other actives in water. The size of the emulsified particles is an important issue. Small particles can be removed in conventional precipitation style waste water systems using alum and lime or similar reagents. They can also be removed by semi-permeable membranes like UF and NF although these may have a tendency to foul (depending on the type of membranes used). The removal efficiency depends on the type of process used.