Decomposition of refractory aniline aerofloat collector in aqueous solution by an ozone/vacuum-UV (O₃/VUV) process
2021
Fu, Pingfeng | Ma, Yanhong | Lei, Bolan | Xiao, Gen | Lin, Xiaofeng
The degradation of refractory aniline aerofloat (AAF) collector was investigated by an ozone/Vacuum-UV (O₃/VUV) process. The effects of O₃ dosage and initial pH on the AAF degradation were studied. The total organic carbon (TOC) and concentrations of , and anions were measured to evaluate the AAF mineralization. The solid phase extraction and gas chromatography–mass spectrometry (SPE/GC–MS) was developed to identify byproducts. The results showed that 99.84% of AAF could be removed by the O₃/VUV, and the AAF degradation was enhanced at higher O₃ dosage and initial solution pH. The radical scavenging tests revealed that most of AAF was degraded by OH• radicals, and the O₃/UV₂₅₄ₙₘ made the main contribution in AAF degradation in the O₃/VUV system. The mineralization extents of C, S, P and N elements of AAF at 180 min reached 47.74%, 93.94%, 17.71% and 45.81%, respectively. At initial pH > 10.0, the EE/O values of AAF degradation by the O₃/VUV was below 7.0 kWh m⁻³ per order, showing the energy consumption was acceptable. The SPE/GC–MS analysis showed that toxic aniline was generated in the O₃/VUV oxidation of AAF, but it was further degraded at a longer time. Compared to the ozonation, the O₃/VUV had a much lower content of aniline at 180 min. The possible degradation pathways of AAF by the O₃/VUV were proposed.
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