臭氧、活性炭、超滤及联用工艺去除邻苯二甲酸酯的效能与机理

Efficiency and mechanism of ozone,activated carbon,ultrafiltration and its combined process for removal of phthalate esters

为提高水厂对邻苯二甲酸酯类环境激素的处理效果,研究臭氧、活性炭、超滤及2种联用工艺对PAEs(DMP、DEP、DBP、DEHP)的去除效果及降解机理.结果表明,单独的臭氧氧化、活性炭吸附、超滤过滤均能去除部分PAEs,最优工艺参数:臭氧投加量8 mg·L-1,空床停留时间15 min,超滤操作压力0.01 MPa.当PAEs进水浓度分别为10μg·L-1、15μg·L-1、20μg·L-1、25μg·L-1时,臭氧—活性炭工艺的PAEs综合去除率为55.19%~66.12%,小分子的DMP、DEP检出浓度均低于3μg·L-1,处理效果优于大分子量的DBP、DEHP.活性炭—超滤工艺对大分子PAEs的吸附截留作用明显,各PAEs物质的检出浓度介于0~3.11μg·L-1.对比2种联用工艺可知,在低中高3种PAEs进水浓度下,活性炭—超滤工艺的PAEs综合去除率及末端PAEs出水浓度均优于臭氧—活性炭工艺的处理效果,超滤作为第三代净水工艺有着良好的技术优势.

In order to improve the performance of environmental hormone in the treatment of phthalic acid esters （PAEs） , the removal efficiency and degradation mechanism of PAEs （ DMP, DEP, DBP, DEHP） by ozone, activated carbon, ultrafihration and two kinds of combined processes were studied in this paper. The results showed that the single ozone oxidation, activated carbon adsorption, uhrafihration filtration can remove part of PAEs, the Optimum uhrafihration operation pressure 0.01 MPa. When the influent concentration of PAEs is 10, 15, 20, 25 μg . L-1, the comprehensive removal rate of PAEs from ozone activated carbon process is 55.19% -66. 12% , the detection concentration of small molecules DMP and DEP is lower than 3 μg . L-1, and the treatment effect is better than that of DBP, DEHP. Activated carbon ultrafiltration process has a signifi- cant effect on the fihration of high molecular weight PAEs, and the detection concentration of PAEs is 0 - 3. 11 μg . L- 1. By a comparison on two kinds of combination process, in low, high influent PAEs concentration, ac- tivated carbon--ultrafihration process on the PAEs removal rate and PAEs end of the effluent concentration are better than that of ozone--activated carbon process treatment. Ultrafiltration, as the third generation water puri- fication process, has a good technological advantage.