Abstract: A system and process for processing a predominantly aqueous phase solution separated from an emulsion coolant recovered from can bodies in a can manufacturing process to recover reclaimable oil. A recirculation line is provided between an ultrafiltration device and a processing tank which receives a predominantly aqueous phase solution produced by acid cracking processing of the emulsion coolant. A substantially constant waste concentration level is maintained in the processing tank and, consequently, through an ultrafiltration device by bleeding concentrated retente from the recirculation line. The substantially constant waste concentration level extends the cleaning cycle period of the ultrafiltration device by an amount consistent with the ability to process concentrated retente bled from the recirculation line. The ultrafiltration device produces a permeate effluent which is consistent and suitable for discharge.