UV/TiO_2和US-UV工艺降解水中六六六

Degradation of Benzene Hexachloride in Water by UV / TiO_2 and US- UV Process

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。

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.