Experimental Study on Degradation of Aniline Residue in Wastewater
Mineral processing agents play a very important role in the development and utilization of mineral resources.However,it is difficult to use 100%of mineral processing agents,and some residual mineral processing agents in wastewater will have a negative impact on the water environment and human health because of their persistence and bioaccumulation characteristics.Aniline black powder is often used in the flotation of non-ferrous sulfide ores because of its strong collecting ability and good selectivity.In this paper,the effect of different degradation conditions on the degradation rate of the simulated wastewater containing aniline was studied.The results showed that the degradation rate of 5 mmol/L potassium persulfate solution on simulated wastewater containing aniline was higher than that of natural degradation rate,but the degradation rate of aniline black drug was still low in general,which was related to the stable benzene ring structure of aniline black drug.With the increase of microwave radiation power,the degradation rate of aniline black drug also increased.When the microwave power was increased from 160 W to 300 W,after 180 min reaction,the degradation rate of aniline black drug with the initial concentration of 20 mg/L increased from 18.3%to 97.5%.The degradation rate of aniline black powder increased from 42.5%to 95.7%(10 mmol/L potassium persulfate)at an initial concentration of 20 mg/L under microwave radiation of 250 W for 60 min.With the increase of solution pH value,the oxidative degradation rate of aniline black drug with initial concentration of 20 mg/L decreased,but the oxidative degradation rate of aniline black drug with initial concentration of 20 mg/L did not change much at solution pH value 3,5,7,and remained at about 90%.
aniline black drugoxidative degradationpotassium persulfatemicrowave radiation
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