TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: Raw sewage slurry is treated to remove large sized solids. The processed sewage slurry is rehydrated and reconstituted back to a mobile liquid consistency, and solid particles larger than 200 mum that remain in the processed sewage slurry are removed, preferably by settlement and by centrifuging, so as to produce a mobile aqueous sewage liquor. Large sized solids are removed from the raw sewage slurry by rollers, presses, screens, sieves or filters. A homogeneous blend of the aqueous sewage liquor and a non-aqueous liquid fuel is prepared by stirring the them together in a mixing tank (3), gently warming the mixture, if necessary, and adding an emulsifying agent, if required. The blend of aqueous sewage liquor and the non-aqueous carrier fuel is analyzed and its composition adjusted if necessary, to enable the blended fuel to be supplied to the combustion chambers. The level of oxygen enrichment supplied to the engine is controlled in dependence of an analysis of the exhaust gas, particularly carbon monoxide coming from the engine. The heat from the engine coolant system and from the hot exhaust gas is used for localized heating purposes and/or to produce steam to drive a steam turbine to generate electricity.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The non-aqueous liquid carrier fuel is a fossil petroleum based fuel, such as diesel gas oil or petroleum fuel oil; or a non-fossil based fuel, such as waste or virgin vegetable oil, waste or virgin animal fat or oil, an alcohol such as ethanol, or blends of animal and vegetable oils or fats and/or alcohols.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: A device is provided to supply normal naturally aspirated air or air enriched with oxygen to the combustion chamber(s). This device is a gas separation membrane, a pressure swing or vacuum swing adsorption unit, or a cryogenic air separation system. The compression ignition engine is a high-speed narrow bore engine, or slow-speed wide bore engine. It is operated at a constant optimum speed that gives maximum thermal efficiency and at a constant optimum power output that gives efficient fuel combustion. The engine is used to generate electricity by coupling the engine to an electrical generator (8). Prescribed pollutants in the exhaust gas from the engine are abated by catalytic de-nitrogen oxides (NOx) unit and a particulate filtration system, and any other abatement that may be necessary.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compositions: The oxygen concentration in the enriched oxygen air supply may be 1% above normal (i.e., 22% oxygen), preferably 4-5% above normal (i.e., 25-26% oxygen).