The output light fractions
As a safety measure in case the waste is contaminated by light fraction oils from the pay zone or from contamination at rig site, the TCC units will have a traditional oil/water separator. To avoid a reduction of the flash point of the base oil, such light fractions will not be condensed in the oil separator, but will be separated from the water stream only after the water is condensed.
Depending on the quality requirements for re-use of the base oil, this light fraction stream can either be re-mixed with the main stream, be used as fuel or be incinerated.