| 摘要 |
PROBLEM TO BE SOLVED: To reduce COD and BOD when reusing or discharging colored waste liquid to a river, used in a color contrast penetrant flaw detection method of metal surfaces. SOLUTION: In this waste liquid treatment method of color contrast penetrant flaw detection, the waste liquid is sent to a single tank type waste liquid treatment tank provided with an opening/closing port and a vent pipe provided at the upper part of the tank; a waste liquid and water feeding pipes at the side upper part of the tank; a separated waste oil outlet port vertically movable between the upper part and intermediate part of the side face of the tank; a double tube with a blow-out port, having an inner pipe for oil feeding and an outer pipe for air feeding at the lower part of the side of the tank; and a separated and treated water outlet port at the tank bottom. Water and/or oil is added when necessary, further carbonized lumps obtained by carbonizing various wastes are added and the content in the tank is agitated with air. Oil-soluble matter containing an oil-soluble dye is transferred to an oily liquid part, settled to be separated to the oily liquid part and an aqueous liquid part. The respective liquids are separately taken out to reduce COD and BOD of the waste liquid. COPYRIGHT: (C)2004,JPO
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