Hi Oscar, my company has had ...

Hi Oscar, my company has had experience with treating wastewater for agriculture and food production in Asia and Australia. I would suggest using a membrane bio-reactor if you want to avoid the coagulation process since the membranes will filter down to 0.1 microns. The bio-reactor will speed up the aerobic digestion process of your fats, oils and ss. 

An alternative would be to change your existing dissolved air technologies with fine and ultrafine bubble technology, I have found that this sort of technology is efficient at flocculation of fats, oils and ss without the need for chemicals. This can be further enhanced with passing the effluent through a static mixer which provides further flocculation. The floc can then be filtered out with a media or membrane filter if needed or allowed to settle with a clarifier.

If you would like to know more, please email me at andrew@waterandoilsolutions.com.au