摘要
采用UV/TiO2与Fenton法的联合工艺处理垃圾渗滤液,考察了反应温度、pH值、TiO2投加量、H2O2用量等对COD去除率和脱色率的影响,比较了单一的Fenton法、UV/TiO2法和UV/TiO2/Fenton法处理垃圾渗滤液的效果。结果表明,反应温度越高,对垃圾渗滤液中COD的去除率和脱色率也越高;pH值为4时处理效果较好,pH值过低会抑制.OH的产生,pH值过高则水中胶体不易被去除,且Fe2+易失去催化活性;TiO2投加量需适当,TiO2过量会引起光散射,降低紫外光辐射效率;过量的H2O2会引发自由基链反应终止;UV/TiO2与Fenton试剂耦合,可促进TiO2表面羟基化,提高.OH的生成效率,加快自由基的链传递,提高对污染物的降解速率。
Landfill leachate was treated by UV/TiO2/Fenton. The influences of temperature, pH, amount of TiO2 and H2O2 on the removal efficiency of COD and chroma were studied. The treatment effects of UV/TiO2/Fenton, Fenton and UV/TiO2 were compared. The results show that： ① Higher temperature has better removal efficiency of COD and chroma. ② The removal efficiency is best when pH is 4. When pH is too low, the production of · OH is prohibited. When pH is too high, the colloids in water are difficult to be removed. Furthermore, Fe^2＋ tends to be inactivated. ③ Proper amount of TiO2 is needed. Superfluous TiO2 results in UV dispersion and reducing the radiation efficiency of UV. ④ Redundant H2O2 can bring about ceasing of free radial reaction. ⑤ UV/TiO2/Fenton can accelerate hydroxylation on the surface of TiO2, promote the production of · OH, quicken the pass of free radial chains, and improve the degradation rate of pollutant.
出处
《中国给水排水》
CAS
CSCD
北大核心
2006年第7期34-37,41,共5页
China Water & Wastewater
基金
"十五"国家科技攻关课题(2003BA808A17-02)
