NOVELTY - Installation structure comprises: a high voltage transformer providing various combination of voltages such as 1000-5000V, 5000-10000V, or 10000-15000V at a time interval of 1 minute, 3 minutes, 5 minutes, 10 minutes, 15 minutes and 20 minutes; a nitrification tank for precipitation of impurities present in food wastages, where both sides of a wall surface of the nitrification tank is provided with a nano-silver plate, a copper plate and an aluminum plate; a metal plate such as zinc plate connected with the nano-silver plate; and a tank containing the food wastages attached with transformer.    USE - The installation structure is useful for producing alternative fuels such as hydrogen (all claimed).    ADVANTAGE - The installation structure produces the alternative fuels in a rapid and economical manner with improved quality and calorific value and less energy consumption.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method for decomposing the food wastages, comprising reacting the wastages in the presence of sodium chloride and a silver material to separate silver chloride and sodium atoms from the wastages and to increase calorific value of the alternative fuels;    (2) a composition for producing alternative fuels, comprising main ingredients (including 55-70 wt.% of vegetable oil, marine waste oil, used oil and transformer oil), subsidiary materials (including 30-43 wt.% of food waste, livestock waste, leachate and inorganic salts), and an inorganic salt composition (including 1-50 wt.% of sodium chloride, 10-70 wt.% of calcium chloride, 30-90 wt.% of sodium carbonate and 10-70 wt.% of magnesium chloride), where the alternative fuels are prepared by mixing the main ingredients, the subsidiary materials and the inorganic salt composition; and    (3) a method for producing alternative fuels, comprising heating the main ingredients mixture at 70-80 degrees C, collecting vegetable oil from the heated main ingredients mixture, mixing the subsidiary materials and the inorganic salt composition with the heated mixture, and processing the mixture and then collecting the alternative fuels.