臭氧氧化乙硫氮的效率、能耗及中间产物生成研究

The Ozonation of Diethyl Dithiocarbamate(SN-9) Collector: Degradation Efficiency, Energy Consumption and Byproducts

捕收剂乙硫氮经水解、氧化可生成剧毒消毒副产物NDEA,因此安全、高效去除浮选废水中残留乙硫氮等浮选药剂日益受到重视。本文研究了低臭氧投加率下臭氧氧化乙硫氮的效率、能耗及中间产物生成规律,结果表明,在低O3投加率时,臭氧氧化乙硫氮的能耗(EE/O)远低于可接受能耗水平,降解生成的含硫副产物H2S浓度约为CS2的20倍。固相微萃取/气相色谱-质谱(SPE/GC-MS)分析表明,降解中间产物多为酰胺类有机物,未检测到亚硝胺类有毒产物,延长氧化时间,有机中间产物种类大幅减少,表明臭氧能进一步分解中间产物。

N-nitrosodiethylamine(NDEA)is generated by hydrolysis and oxidation of the collector diethyl dithiocarbamate(SN-9),thus,it has attracted high concern to remove SN-9 from flotation wastewater effectively and safely.In this study,the degradation efficiency,energy consumption and formation of byproducts were investigated in the ozonation of SN-9 with low O3 dosage.The results showed that the energy consumption index of EE/O was much lower than the acceptable level.The concentration of sulfur byproducts H2S was almost 20 folds higher than CS2.The solid phase extraction and gas chromatography-mass spectrometry(SPE/GC-MS)analysis indicated that main byproducts were amide compounds without the detection of N-nitrosamines.The kinds of byproducts were decreased by extending the degradation time,indicating further degradation of formed byproducts.