光电氧化降解饮用水中有机污染物的效能

Performance of photoelectro-oxidation process on the degradation of organic pollutants in drinking water

针对地表水中普遍存在的有机污染物现状和常规水处理工艺无法去除有机污染物的问题,以紫外光电氧化技术为基础,提出了以“分质供水”为目标的末端深度水处理工艺。与单独电解和光解相比,电化学氧化与紫外耦合技术可以将布洛芬、阿特拉津、三氯乙酸、乐果的降解率在15 min内分别提高到92.5%、98.1%、71.0%和94.6%,并且能耗有所降低。电流和光强对光电氧化降解有机污染物有促进作用,但污染物初始质量浓度、Cl^(-)、HCO_(3)^(-)和天然有机物(HA)和污染物去除率呈反比关系。在此基础上,以布洛芬为污染物代表,测定了布洛芬的中间产物,并计算了降解中间体的毒性变化,发现光电氧化明显降低了布洛芬的毒性。

In view of the present situation of organic pollutants in surface water and the problem that these organic pollutants cannot be effectively removed by the conventional water treatment technology,a deep end water treatment technology based on ultraviolet(UV)irradiation with electrochemical technology was proposed for dual water supply.Compared with electrolysis or UV irradiation alone,photoelectro-oxidation process coupled with UV irradiation could increase the degradation rates of ibuprofen,atrazine,trichloroacetic acid and dimethoate to 92.5%,98.1%,71.0% and 94.6% in 15 min,respectively,and could reduce the energy consumption.The increase of current and light intensity accelerated the degradation of organic pollutant by photoelectro-oxidation process.However,the initial concentration of pollutants、Cl^(-)、HCO_(3)^(-)and organic matter(HA)were inversely proportional to the removal rates of these pollutants.Moreover,ibuprofen was taken as the representative pollutant,its intermediate products were determined and their toxicity changes were calculated.It was found that photoelectron-oxidation significantly reduced the toxicity of ibuprofen.