焦化废水中有机污染物的光催化处理  

Photocatalytic degradation of organic pollutants in coking plant wastewater

作　　者：赵清华[1] 全学军[1] 谭怀琴[1] 桑雪梅[1] 叶长英[1] 

机构地区：[1]重庆工学院化学与生物工程学院化学工程系,重庆400050

出　　处：《化工进展》2009年第5期894-898,共5页Chemical Industry and Engineering Progress

基　　金：重庆市教委科学技术研究项目(KJ080617)

摘　　要：采用TiO2与粉末活性炭复合光催化剂(TiO2/PAC)对焦化废水中多种有机污染物进行了光催化处理。研究表明,TiO2/PAC对焦化废水中多种有机污染物的光催化处理具有良好的协同效应。将TiO2进行稀土掺杂后,可提高RE-TiO2/PAC对焦化废水中有机物的吸附能力。进一步考察了复合催化剂浓度、废水初始pH值、有机物(COD)的初始浓度、气体流量对最佳光催化剂Nd-TiO2/PAC处理焦化废水的影响。对COD初始浓度为385mg/L、初始pH值为9.82的焦化废水,在气体流量为0.093L/(L·min)、催化剂浓度4.0g/L的条件下,经Nd-TiO2/PAC光催化处理90min后,废水中的COD去除率可达89%。Organic pollutants of coking plant wastewater are very complicated, which are harmful to the environment and are difficult to be treated. Photocatalytic degradation of the organic pollutants in coking plant wastewater was investigated by using mixture of TiO2 and powder activated carbon （PAC） as photocatalyst. Synergistic effect can be obtained by combination of TiO2 and PAC. Better absorption can be obtained when TiO2 is doped with rare earth, and the mixed photocatalyst of Nd-doped TiO2 and PAC exhibited better photocatalytic degradation for the pollutants when the mass ratio of Nd-TiO2/PAC is 1. The effects of catalyst dosage, initial pH, initial COD concentration, aeration rate on treatment of coking wastewater by Nd-TiO2/PAC are investigated in this paper and the optimal process conditions are determined. The results show that the removal efficiency of COD can reach 89% under conditions： aeration rate 0.093 L/（L·min）, catalyst dosage 4.0 g/L, initial COD concentration 385 mg/L, pH=9.82, reaction time 90 min.

关 键 词：焦化废水 有机污染物 光催化 

分 类 号：X789[环境科学与工程—环境工程]