PURPOSE: To perfectly and inexpensively decompose cyan by subjecting a cyan compd., a nitrogen compd. or the like in waste water to wet oxidation treatment in the presence of oxygen and separating and removing sludge and/or metal components from the treated soln. and adding sulfuric acid, sulfur or the like to the treated soln. before applying wet oxidation treatment thereto.
CONSTITUTION: The cyan-containing waste water from a waste water storage tank 1 is mixed with the oxygen-containing gas from a compressor 22 to be supplied to a primary reaction tower 5. The quantity of oxygen added to this waste water is set to below theoretical oxygen quantity necessary for decomposing a cyan compd., a nitrogen compd. or the like into harmless products. The treated soln. issued from the reaction tower 5 is sent to a gas-liquid separator 6 through a heat exchanger 3 and a cooling tower 7 and the separated liquid phase component 10 is separated into a primary treated soln. 12 and a solid 3 by a solid-liquid separator 11 and a part of the primary treated soln. 12 is allowed to meet with the treated soln. of the reaction tower 5 and the remainder thereof is sent to an intermediate storage tank 16 and mixed with sulfuric acid supplied from a sulfuric acid storage tank 14. The resulting soln. mixed with oxygen-containing gas is sent to a secondary reaction tower 20 packed with a catalyst and subjected to wet oxidation treatment.
HARADA YOSHIAKI
NOGUCHI FUYUKI
INOUE GENNOSUKE
HIRAOKA MASAKATSU
TAKAHASHI HEIHACHI
NIHON PARKERIZING
ZOUSUI SOKUSHIN CENTER
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