TiO_2光催化预氧化对城市二级出水中溶解性有机物性状影响  

Effect of TiO_2 Photocatalytic Pre Oxidation on the Dissolved Organic Matters Characters in the Secondary Effluent of Municipal Wastewater

作　　者：李一飞[1] 王旭东[1] 吴珂琦 王磊[1] 贾世发 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《水处理技术》2016年第11期83-88,共6页Technology of Water Treatment

基　　金：国家自然科学基金项目(51278408);陕西省科技新星项目(2014KJXX-65)

摘　　要：以城市污水二级出水为对象,研究了纳米TiO_2光催化预氧化对水中有机物分子量分布、可生化性、反应动力学及三维荧光特性等的影响。结果表明,光催化在60 min时对二级出水中有机物分子量分布影响较大,对有机物的去除也较为明显;二级出水中有机物的去除率及可生化性在30 min时改变最明显;该光催化氧化反应属于准1级反应,其中UV_(254)的反应速率最大(K最大为8.81×10^(-3) min^(-1))、半衰期更短,即二级出水中含π键等不饱和物质在光催化氧化下,比其它有机物更易被降解;随光催化反应时间延长,二级出水中腐殖酸类物质逐渐降解为蛋白质、氨基酸类物质,光催化60 min时对水中荧光物质降解较为明显。For the secondary effluent of municipal wastewater, it was treated by nano TiO2 photocatalytic pre oxidation, and this paper was studied the effects of this treatment on the molecular size distribution, removal efficiency, reaction kinetics, and three dimensional fluorescence spectra characteristics of organic matters in secondary effluent of municipal wastewater. The results showed that： at the 60 min time ofphotocatalytic reaction, the molecular size distribution （MSD） of the secondary effluent was greatly affected by photocatalysis, and meanwhile, the removal of organic matters in the secondary effluent was also more reasonable; At the 30 min time of photocatalytic reaction, the change of the organic matters removal rate and biodegradability were also more economical and reasonable. The photocatalytic oxidation reaction was quasi first order reaction, among them, the reaction rate of UV2~ was the fastest （the maximum value of K is 8.81x10-3 min-~）, and half-life was shorter, that is when the secondary effluent containing pi bond unsaturated substances was in photocatalytic oxidation, its degradation was easier than other substances. With the increase of the time of photocatalytic reaction, humic acid substances in the secondary effluent were gradually degraded into proteins and amino acids. The degradation of the fluorescent substances in the secondary effluent was obvious and reasonable in the photocatalytic of 60 min.

关 键 词：光催化氧化 二级出水 溶解性有机物 相对分子质量分布 三维荧光光谱 反应动力学 

分 类 号：X703.1[环境科学与工程—环境工程]