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采用UV/TiO_2、US-UV两种工艺分别降解饮用水中低浓度持久性有机氯农药(α-BHC,六六六),研究不同TiO_2浓度条件下,紫外光催化降解α-BHC的降解效果,同时比较了不同粒径的TiO_2对α-BHC降解效果的影响。分别考察了先紫外90 min再超声30 min与先超声30min再紫外光降解90 min两种联用工艺对α-BHC去除效果。结果表明,TiO_2粉末粒径越小,α-BHC去除率越高,先超声30 min再UV光降解90 min比先UV光降解90 min再US空化30 min的降解率高,说明超声对紫外有协同作用。
UV-TiO2 and US-UV were used to degrade low concentrations of persistent organic chlorinated pesticides (α-BHC, BHC) in drinking water respectively. The degradation of α-BHC by UV light was studied under different TiO 2 concentrations The effect of TiO 2 with different particle size on the degradation of α-BHC was also compared. The removal effects of α-BHC on the combination of the first UV 90 min and the second 30 min followed by the first 30 min UV and the second UV degradation 90 min were investigated. The results showed that the smaller the particle size of TiO_2, the higher the α-BHC removal rate, the first 30 min of ultrasonic degradation of UV light 90 min later than the first UV degradation of light 90 min and US cavitation 30 min the degradation rate, indicating ultrasonography of ultraviolet A synergistic effect.