PURPOSE: To reduce the amt. of chemicals to be used, the amt. of water to be supplied and the amt. of chemical components in waste water by washing the inner wall surface of a chemical booth after chemical treatment and evacuating the booth with an exhaust fan to volatilize the water corresponding in amt. to the cleaning water into the atmosphere. ;CONSTITUTION: A material to be treated is degreased or the surface of the chemical film is treated in a treating booth 2, and the degreasing or chemical film treating soln. is drained. A valve 13A is opened to supply water through a wall surface cleaning pipeline 13, and the wall surface in the booth 2 is washed and cleaned. At this time, the booth 2 is evacuated by an exhaust fan 15 at a rate of about 100m2/min through an exhaust duct 14, the chemical mist separated in a gas-liq. separator 16 is returned to the booth 2 through a return pipe 17, and the water corresponding in amt. to the cleaning water is volatilized into the atmosphere as moisture. Consequently, the consumption of chemicals contained 10 the waste water is reduced, the chemical component in the waste water is decreased, and the amt. of water to be supplied to the washing water is diminished.;COPYRIGHT: (C)1994,JPO&Japio
展开▼
