硫酰氟对臭氧衰减的影响及其尾气处理技术研究

Study on the Effect of Sulfuryl Fluoride on Ozone Elimination and Technology for Tail Gas Treatment

硫酰氟是一种潜在的磷化铝替代熏蒸剂,在其大规模使用前,其环境风险的评价及排放处理研究具有重要意义。研究硫酰氟对臭氧的破坏作用和硫酰氟尾气处理方法。向350 mg/m^(3)臭氧实验箱中分别通入5、10、20 g/m^(3)的硫酰氟,检测不同浓度硫酰氟条件下,臭氧衰减曲线。实验结果表明:当实验箱温度设定为25℃,无硫酰氟环境臭氧浓度半衰期为275.2 min,5、10、20 g/m^(3)三个硫酰氟浓度环境臭氧半衰期分别为157.4、166.4、161.8 min。经统计分析,3个浓度硫酰氟存在环境下臭氧浓度衰减的3组半衰期数据没有显著性差异,硫酰氟对臭氧衰减动力学曲线和半衰期存在显著性影响。通过比较活性炭颗粒、中性氧化铝、氢氧化钙悬浊液和氢氧化钠溶液对硫酰氟降解消减的能力,确定了氢氧化钠溶液的处理方法。随着温度升高,处理半衰期缩短,20、25、30℃条件下,0.25 mol/L氢氧化钠溶液浓度对硫酰氟处理的半衰期为592.5、404.2、323.5 min。

It is of vital importance to evaluate the environmental risks brought by sulfuryl fluoride before applying it wildly as an alternative to aluminum phosphide in grain storage.Degradation kinetics of 350 mg/m^(3) ozone was investigated under sulfuryl fluoride concentrations of 5,10 and 20 g/m^(3).The results show that ozone degradation was significantly accelerated by sulfuryl fluoride in air.The half-life of ozone concentration in the sulfuryl fluoride-free environment is 275.2 min,while the half-lives of ozone in the 5,10,and 20 g/m^(3) sulfuryl fluoride concentration are 157.4,166.4 and 161.8 min,respectively.In this study,we compared the sulfuryl fluoride elimination of active carbon,neutral aluminum oxide,calcium hydroxide suspension and sodium hydroxide solutions to eliminate sulfuryl fluoride,and sodium hydroxide solution was employed finally.The study found that temperature is a key factor in the process of sulfuryl fluoride elimination.The half-lives of sulfuryl fluoride were 592.5,404.2,and 323.5 min at 20,25,and 30℃,while the sodium hydroxide solution was 0.25 mol/L.