METHOD FOR INSOLUBILIZING WASTE WATER FROM FLUE GAS DESULFURIZER

PURPOSE:To insolubilize concd. waste water and to discard the insolubilized material for landfill by adding cement or a mixed powder of cement and coal ash to the concd. waste water obtained by concentrating the waste water from a flue gas desulfurizer by alkali and kneading the admixture. CONSTITUTION:The sulfur dioxide gas in a waste combustion gas is absorbed and separated in a desulfurizer with alkali such as limestone as the absorbent. The waste water from the desulfurizer is treated by a vaporizing and concentrating device to vaporize the water, concentrated and reduced in volume. The concd. waste water is supplied to a tank 1 from the vaporizing and concentrating device through a line (a), transiently stored therein and then supplied to a kneader 5. The cement in a cement storage 2 and the coal ash in a coal ash storage 3 are mixed by a mixer 4, and the mixed powder is supplied to the kneader 5 through a line (e), added to the concd. waste water and kneaded. The kneaded mixed powder is mixed with the concd. waste water, the obtained admixture is then dried by a drier 6, and the dried admixture is discarded for landfill.