DECONTAMINATION SYSTEM

The present invention achieves a decontamination effect with a proper amount of hydrogen peroxide mist supplied to a room to be decontaminated by further refining such hydrogen peroxide mist supplied to the room for dispersion/diffusion, and reducing the duration of operations such as aeration to increase efficiency of decontamination.The decontamination system includes a mist generation means, a mist discharge port, and a mist dispersion/diffusion means. The mist generation means converts a decontamination liquid into a mist to generate a mist for decontamination. The mist discharge port is opened at an upper portion on an internal side wall surface of the room to discharge a such mist into the inside of the room. The mist dispersion/diffusion means generates sound flows by an ultrasound in the vertical direction from a plate surface of a vibration plate provided adjacent to a lower portion of the mist discharge port on the internal side wall surface of the room or adjacent to a lower portion on a side surface in a mist discharge direction. The mist is pressed by acoustic radiation pressure backward or laterally in intermittent operation or stronger/weaker operation of the system.