JPS55142590A - Treating method of water containing hydrazine - Google Patents

Abstract

PURPOSE: To efficiently decompose hydrazine contained in exhaust water from a high pressure boiler of a steam-power station or the like by oxidation in the presence of a copper catalyst as well as to recover copper used as a catalyst to reuse said copper availably.

CONSTITUTION: The water 6 to be treated containing hydragize is adjsted to pH about 9W12 and introduced to an oxidizing tower 2, and, at the same time, an aqueous solution 8 containing mineral acid salt of copper such as copper sulphate, copper chloride or the like is added as well as air 9 is supplied. Herein, hydrazine is almost completely oxidized by catalytic action of copper iron and oxygen in air to decompose the said hydrazine into nitrogen and water, on the other a large amount of copper ion added as a catalyst is changed to water insoluble copper hydroxide. Subsequently, the water 10 issued from an oxidizing tower 2 is passed through a filtering machine 3 to catch the said water insoluble copper hydroxide and the outflow water 11 is passed through a cationic exchange resin tower 4 to remove a minute amount of copper ion contained in the said outflow water 11. Subsequently, if the filtering is carried out for a difinite time in a filtering machine 3, because copper hydroxide is caught, an aqueous meneral acid solution 14 is passed through a filtering layer to which copper hydroxide is caught to dissolve copper hydroxide caught in the said filtering layer and the eluate is recovered a tank 5 containing an aqueous mineral acid salt to be reused.

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