NOVELTY - A bio-reactor (5) processes a slurry (S) to produce a bio-gas (G) and a liquor (E). A fuel battery (10) uses the bio-gas and generates electric power and high temperature water. The heat retention unit (5a) of the bio-reactor is heated with the high temperature water from the battery.    USE - For energy recovery system for organic refuse obtained from hotels, departmental stores, airport, railway stations, hospitals, etc., to produce electrical energy, high temperature water and compost material.    ADVANTAGE - The system effectively conserves energy. High temperature water is recovered efficiently and is utilized effectively. The bio-reactor is compact and is economical. There is no generation of dioxin. Generation of carbon dioxide is reduced and there is no generation of dust, nitrogen oxides and sulfur oxides. Generation of noise and vibration is reduced.    DETAILED DESCRIPTION - The system has grinding units (1,2) which grind organic refuse to form the slurry. The slurry is fed to the reaction chamber of the bio-reactor which processes the slurry using methanation microbes, at high temperature. The slurry is converted into the bio-gas and liquor. The liquor is purified further and treated in a secondary treatment unit (6) where surplus sludge is added to form a compost. The driving of the grinding units, the bio-reactor and the secondary treatment unit is carried out using electric power from the fuel battery, so that the system further generates electric power and outputs compost material. A methane processing installation is provided between the bio-reactors and the fuel batteries and has a wet refiner. The waste water from the refiner is sent to the secondary treatment unit and is processed with liquor. The grinding unit has a high pressure process machine which converts the organic refuse to a liquid grinding paste by application of high pressure. A pulverizer pulverizes the grinding paste between the opposite surfaces of a pair of grinding stones.    DESCRIPTION OF DRAWING(S) - The figure shows the flow chart of energy recovery system.    Grinding units (1,2)    Bio-reactor (5)    Heat retention unit (5a)    Secondary treatment unit (6)    Fuel battery (10)    Liquor (E)    Bio-gas (G)    Slurry (S)