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Researches on Potassium Permanganate Oxidation of the High-concentrated Acrylonitrile Wastewater

Song Meiyun Yang Haijun* Xiao Xuejian Wang Huizhen(School of Materials Science and Engineering,Southwest University of Science and Technology,Sichuan Mianyang 621010)  
In the preparation of chelating resin for extracting uranium from seawater,it has produced a large amount of high-concentrated acrylonitrile wastewater,of which the CODCr is up to 110 770 mg/L.Acrylonitrile is the main toxic pollutant of the wastewater,whose boiling point is 77.1℃,so that the wastewater can be utilized fractionation process and the most fraction is collected at 75℃ to 78℃.The distillate at 95℃~98℃ is accounts for 90% of the total wastewater volume,and its CODCr is 59 220 mg·L-1.This distillate will be needed further treatment to meet the integrated wastewater discharge standards.Then the remaining amount of high boiling point organic compounds accounted for only 3% of total wastewater,which can be burned.In this paper,the distillate at 95℃ to 98℃ is researched with potassium permanganate oxidation process,the effect of which is dicussed by using orthogonal test which are concentration of potassium permanganate,pH value,temperature and oxidation time.Through the experiment discovered that the best testing conditions of potassium permanganate oxidation is realized when c(KMnO4)=3.165 mol·L-1,pH=2~3,temperature at 100℃,and oxidation time on 30 min,to provide effective and reliable parameter for this kinds of wastewater treatment.
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