| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently remove manganese and heavy metals with a simple device by adding hypochlorite to the desulfurized waste water discharged from a wet flue gas desulfurizing device for absorbing/separating sulfur oxide in combustion waste gas by wet lime-gypsum method and then adjusting the waste water to a specified pH and subjecting the waste water to a solid-liq. separation. SOLUTION: At the time of treating the desulfurizing waste water, the desulfurized waste water is first introduced into a reactor, and the hypochlorite is added to the desulfurizsed waste water and mixed. At this time, the hypochlorite is added so that the oxidation-reduction potential of the reactor is >=600 mV, preferably 700-900 mV. Then the reaction liq. in the reactor is introduced into a neutralization tank and an alkali agent is added to adjust the pH to 7-9.5. Manganese ions are converted to manganese dioxide by the addition of the alkali and precipitated as an insoluble solid. Then the reaction liq. in the neutralization tank is introduced into a solid-liq. separation device, and supernatant liq. is discharged to the outside of system as treated liq. and the solid containing the precipitated manganese dioxide is discharged as sludge.</p> |
