Abstract: A supervisory control panel board includes a supervisory control panel having illumination apertures therein at a supervisory display surface zone of the panel. The panel board also includes a dressing frame, which frame is removably mounted on the display surface of the supervisory control panel. When mounted on the supervisory control panel, the dressing frame supports a film member in a state wherein this film member is kept in close contact with the supervisory display surface. That film member is inscribed with a graphic diagram of the process steps desired to be supervised.

Abstract: A process for waste water disposal is herein disclosed, in which waste water of high BOD concentration is subjected to an aeration treatment in an aeration vessel so as to reduce the BOD concentration thereof by circulating within said aeration vessel a quantity of coal or active carbon of which 80% or higher is of particle size between 2 and 5 mm and less than 50% is of particle size difference within a range of 0 to 0.5 mm, and microorganisms implanted thereon. Said aeration vessel is adapted for effective disposal of waste water of high BOD concentration without any requirement of water dilution and comprises a pair of long side walls, a pair of short side walls, a bottom wall defined by these pairs of side walls, an upper opening, wherein a lower portion of one long side wall is at an angle of 45.degree. to 60.degree. with respect to the horizontal, and a plurality of air blower pipes provided along the inner surface of the other long side wall adjacent said bottom wall.