摘要
焦化废水污染物浓度高、生化降解难,利用纳米TiO2粉体,以紫外光(UV)为光源,进行了光催化处理焦化废水的试验研究,考察了TiO2用量、紫外光强度、焦化废水初始pH对COD和NH4+-N去除的影响;探讨了O2、O3、H2O2和Fenton试剂4种氧化剂与光催化的协同作用机理,分析了对COD和NH4+-N去除效果的影响,得出了最佳试验条件。结果表明,氧化剂与光催化协同作用使COD和NH4+-N的降解去除率得到了显著提高。在本试验条件下各氧化剂强化光催化对COD和NH4+-N去除率排序如下:TiO2+UV+Fenton>TiO2+UV+O3>TiO2+UV+H2O2>TiO2+UV+O2>TiO2+UV。
CokingwastewaterhasalotoforganicpoUutants, and is hard to be biologically degraded. Photo-catalytictreatmentofcokingwastewaterwas examined by nanometer TiO2 under ultraviolet（UV）. Effect of amount of TiO2, irradiation intensity, initial pH value ofcoking wastewater on removal rates of COD and NI4＋-N was investigated. The synergistic mechanisms of photo-catalysis with O2, O3, H2O2 or Fenton reagent were discussed. Effect on removal of COD and NH4＋-N was analyzed, and the optimal conditions were obtained. Experimental results show that the removal rates of COD and NH4＋-N greatly increasedbyphoto-catalysiscombinedwithoxidant. Under the experiment conditions, the order ofremoval rates ofCOD and NH4＋-Nbyphoto-catalysis with oxidant was：TiO2＋UV＋Fenton〉TiO2＋UV＋O3〉TiO2＋UV＋H2O2〉TiO2＋UV＋O2〉TiO2＋UV.
出处
《水处理技术》
CAS
CSCD
北大核心
2009年第10期78-81,117,共5页
Technology of Water Treatment
