NOVELTY - Treating waste material by introducing waste material into first treatment stage to remove more volatile components from waste material by forming at least two portions, conveying the at least partially refined portion of second treatment stage to further refine the partially refined portion into the at least two additional portions, and collecting the refined portion containing the useful or useable component.    USE - For treating waste material useful as fuel used in internal combustion engine, compression engine, hydrogen assisted combustion engine used to generate electricity, heat, or power (claimed). Waste material includes fats. oils and greases, for use as e.g. non-biodiesel fuel.    ADVANTAGE - The novel method allows conservation of energy.    DETAILED DESCRIPTION - Treating waste material involves introducing waste material into first treatment stage to remove a more volatile component from waste material by forming at least two portions, conveying the at least partially refined portion of second treatment stage to further refine the partially refined portion into the at least two additional portions, and collecting the refined portion containing the useful or useable component. One of the portions is partially refined portion with useful component and the other portion contains volatile component. One of the additional portions includes the useful component and the other of the additional portions includes relatively more volatile component, thus further refining the partially refined portion into a refined portion. A portion(s) with more volatile component is (partially) free of useful component. The portion with more volatile component can be used, recycled or further processed to improve the efficiency or economics of the refining process for the useful or useable component, or the use of the waste material. The waste material has useful or reusable component to recover the useful or useable component from the remaining components of the waste material.    An INDEPENDENT CLAIM is included for a combined waste material treatment installation and energy production facility.    DESCRIPTION OF DRAWING(S) - The figure shows a flow-chart of the above process.    Conduits (10, 14, 36, 40, 62, 64, 69, 72, 80, 97, 99)    Feed pump (12)    Re-circulation pumps (38, 68)    Separator (84)    Diesel engine (86)    Heat exchanger (90)    Compression fan (96)    Aroma tank (98)