During chemical-physical wastewater treatment, a flocculant is added the organically polluted wastewater (mainly with emulsions of fats and oils plus dissolved components). Through the flocculation that this causes emulsified and dissolved elements are also retained in the separator. This increases the proportion of residues and so the disposal cycle needs to be adjusted to suit.

Wastewater as a innovative heat source become particularly attractive where high quantities of waste water and temperatures are present. These two parameters are often found in gastronomy of commercial kitchens and therefore provide optimal conditions for the economic recovery of the heat. Interface for the installation of this technology are grease seperators.