NOVELTY - A reaction container (10) which generates supercritical fluid, is connected to outlet pipe structure (14) and processed liquid supply container (52). A heater (12) inside the reaction container, always maintain fluid inside the container in supercritical state.    USE - For processing of fluid containing polycarbonated biphenyl (PCB) and dioxin so as to make them harmless.    ADVANTAGE - Because of the reaction container, dioxin and PCB are made into harmless rapidly. Therefore safety is improved and environmental pollution is avoided.    DETAILED DESCRIPTION - A liquid phase and gaseous phase portions are arranged in bottom and top of the reaction container. The heater is arranged in the liquid phase portion. The outlet pipe structure has pipes (16,18,22) with valves (24,26) and pressurization container (34) having an upper chamber (36) retaining pressurized water and a lower chamber (38) retaining pressurized oil. A feed pipe (40) with a valve (42), has one end connected to the pipe (18) and other end connected to the upper chamber (36). A casing (20) surrounds the pipe (18). A receiving tray (28) is downwardly arranged to the pipe (22). A release pipe (30) has top end connected to the pipe (18) and bottom end opened to receiving tray. A supply unit (50) supplies cooing water to the casing pipe. The processed liquid supply structure has pressurization container which holds processed liquid. A pipe (56) has one end connected to pressurization container and other end connected to reaction container. A shut-off-valve (58) is provided in the middle of the feed pipe (56). An auxiliary pipe (60) with a valve (62), has one end connected to the pressurization container and other end connected to the reaction container. A supercritical fluid is chosen from water, carbon dioxide, methane, ethane, propane, methanol, ethanol, ammonia and nitrous oxides. The processed liquid containing toxic substances such as polycarbonated biphenyl and dioxin are held of pressurization container. When fluid inside the reaction container decreases, supercritical fluid is supplied into the reaction container from the pipe (16) by operation of a pump (48).    DESCRIPTION OF DRAWING(S) - The figure shows the entire assembly of the fluid processing apparatus.    reaction container (10)    heater (12)    outlet pipe structure (14)    pipes (16,18,22)    casing (20)    receiving tray (28)    pressurization container (34)    upper and lower chambers (36,38)    valves (40,62)    pump (48)    supply unit (50)    processed liquid supply container (52)    feed pipe (56)    shut-off-valve (58)    auxiliary pipe (60)