Studies On Treatment Of Wastewater Containing Acrylonitrile By Advanced Oxidation Processes

Wastewater containing acrylonitrile (AN) is a kind of industrial wastewater which generally exist with harmful substance. Because of toxicity.it is necessary to adopt a very special method in the course of treatment.In this paper, the source, toxicity, present situation and usual treatments of wastewater containing AN were reviewed. A novel technique of advanced oxidation processes (AOPs) is used to the treatment of the high concentration wastewater. Adopting photochemistry, k2FeO4, Fenton reagent and TiO2 oxidation for treatment of containing AN wastewaters, we studied features and effects of different techniques on the removing of AN and COD. The influence of the amount of oxidant and catalyst, initial concentration of AN, pH value, temperature and UV on the reaction in the simulating system were investigated.The results show (1)that a treatment of the simulating wastewater by using UV can get a good result, to the wasterwater containing 300 mg/L AN, by using UV illumination of 80 mins, rates of AN and COD residue are 31%, 61% respectively, lending the illuminating time of 180 mins, the residue rate of COD is below 30%, and rising the temperature can increase the result of desposal at the same time (2)that K2FeO4 compound is a kind of highly efficient water treatment agent, and it can oxidize AN without repollution, by disposing the wastewater (300 mg/L), putting 20 mg/L K2FeO4, reacting 80 mins, rates of AN and COD residue are below 20%, 50% respectively, and by longing the reacting time of 180 rains, the rate of COD residue is below 25% (3)that a treatment of the simulating wastewater containing 300 mg/L AN,Fenton reagent is a kind of effective method, putting 400mg/L Fe2+ and 400mg/L H2O2 respectively and reacting 15mins can make the residue rate decrease to below 20%. Raising the amount of Fe2+, H2O2 respectively can increase the removing rate, too high to result in removing rate dropping ï¹–hat by using TiO2(20mg/L) to disposal the wastewater of 300 mg/L, the rate of COD residue is below 15% without second pollution (5)Comparing with the efficiency, practical operations and influences on environment of UV, K2FeO4, Fenton reagent, UV-TiO2, we can conclude that there is the order: UV>UV-TiO2>K2FeO4 Fenton reagent.