Removal of Betamethasone from Pharmaceutical Wastewater by Vacuum UV/UV Process
Water pollution has become a global environmental problem,among which pharmaceutical wastewater is of great concern because it contains a variety of toxic and harmful organic compounds.In this study,we investigated the degradation of betamethasone in pharmaceutical wastewater by the vacuum ultraviolet/ultraviolet(VUV/UV)process and evaluated its defluorination efficiency.The results showed that the degradation rate of betamethasone by the VUV/UV process reached 99.1%after 2 minutes of reaction,which was significantly better than that of the UV process alone.The degradation and defluorination of betamethasone by the VUV/UV process were realized by the generation of hydroxyl radicals to attack the fluorine atom.The removal of betamethasone was better under alkaline conditions.The actual wastewater inhibited the degradation of betamethasone by the VUV/UV process due to the interference of other organic substances,but a degradation rate of 96.9%was still achieved after 2 minutes of reaction.Therefore,the VUV/UV process has the potential to be applied to the treatment of pharmaceutical wastewater.
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