Removing or Treating edible oil in waste stream - From the Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Removing or Treating edible oil in waste stream: "please consider that likely most of the oil is bound to the biosolids. You might check that in lab after filtration.
Eventually then oil and biosolids can be removed by filtration in front of the aeration basin. You might make this strategy feasible by looking for filtration aids and/or flocculants.

A further option besides DAF or demulsifier addition is coagulation or flocculation followed by settling.

I do not thing that it is possible to remove oil and biosolids separately unless you apply centrifugation, which is another option. "
Your real problem seems to get started when you are putting the oil / biosolids dispersion into the aerated unit. Obviously here is the ideal place for producing bio emulsifiers. This has to be avoided.
Therefore, the oil loaden biosolids should be removed earlier.
And do not expect that removal of oil covered biosolids is the same as removal of a common emulsion.