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The treatment of coking residual ammonia water has been a bigdifficult problem at home and abroad, and there is no breakthrough research achievement in the past. The invention patent The method of treating all coking wastewater or treating coking residual ammonia water by flue gas has been successfully used in Huaian Steel Works for high concentration and organic industry wastewater treatment. Not only can it realize the wastewater zero discharge, but also the wastewater treatment has an effect of de-sulfur and de-nitrogen for flue gas. So that the flue gas exhaustcan meet the requirement of emission standard. The mass transfer and heat transfer, fly ash absorption and coagulation, acid and alkali neutralization reaction, catalysis oxidation and reduction reaction in flue gas would be the major factors.