焦化废水外排水的TiO_2光催化氧化深度处理及有机物组分分析

TiO_2 Photocatalytic Oxidation Treatment and Analysis of Organic Pollutant Components of Discharge Wastewater from Coking Wastewater Treatment Station

采用TiO2光催化氧化法对焦化废水外排水进行深度处理,考察反应时间,TiO2投加量及废水初始pH对TOC降解的影响,通过GC/MS技术对处理前后废水中的有机物组分进行定性分析,解析废水在TiO2光催化氧化过程中有机物的降解规律.结果表明:在反应时间为3 h,TiO2投加量为4 g/L,以及不调节废水pH的条件下,焦化废水外排水经TiO2光催化氧化深度处理后TOC的去除率为53.40%,有机物种类由66种降为23种;TiO2光催化氧化法对除多环芳烃外的其他有机物均有较好的去除效果;不同种类有机物在TiO2光催化氧化过程中的降解速率为石油烃>醇、酸、醛等有机物>酚>苯系物>含氮杂环有机物>多环芳烃.

TiO2 photocatalytic oxidation was used to perform the advanced treatment of discharge wastewater from a coking wastewater treatment station.The effects of reaction time,TiO2 dosage and initial pH on TOC removal rate of wastewater were tested.The GC/MS technique was used to give a qualitative analysis of wastewater before and after treatment.The degradation regularity of wastewater during the TiO2 photocatalytic oxidation process was analyzed.The result showed that under the conditions of reaction time 3 h,TiO2 concentration 4（g/L） and unadjusted wastewater pH,the TOC removal rate of the wastewater was 53.40%.Additionally,the number of species of organic matter was reduced from 66 to 23 in the wastewater after being treated by TiO2 photocatalytic oxidation.TiO2 photocatalytic oxidation had better removal efficiency for organic pollutants with the exception of PAHs.During the process of TiO2 photocatalytic oxidation,the degradation rates of different organic pollutants were as follows： petroleum hydrocarbon 〉 alcohol,acid,aldehyde and other organic pollutants 〉 phenols 〉 benzene derivatives 〉 nitrogen heterocyclic compounds 〉 PAHs.