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中文摘要：
采用UV／TiO2、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TiO2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TiO2对α—BHC降解效果的影响。分别考察了先紫外90min再超声30min与先超声30min再紫外光降解90min两种联用工艺对α—BHC去除效果。结果表明，TiO2粉末粒径越小，α—BHC去除率越高，先超声30min再UV光降解90min比先UV光降解90min再US空化30min的降解率高，说明超声对紫外有协同作用。
英文摘要：
The two processes UV （ultraviolet）/TiO2 and US （ultrasound）/UV were used to degrade the trace persistent organic chlorine pesticide benzene hexachloride （α-BHC） , respectively. The UV photocatalytic degradation process of α-BHC was investigated for various initial TiO2 concentrations. Meanwhile the TiO2 of different size was used to elucidate the degradation efficiency of α-BHC. The effects of two operation conditions （UV 90 min before US 30 rain and US 30 min before UV 90 min） were also studied to compare the removal efficiency of α-BHC. The results showed that the removal percentage of α-BHC was gradually increasing with the decrease of Size of TiO2 particle, and the second operation process （ US 30 min before UV 90 min） was superior to the first operation process （ UV 90 rain before US 30 min）, which suggested that US was synergy to UV process.
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