水中腐殖酸对高级氧化联用技术去除内分泌干扰物（DMP）的影响

使用腐殖酸模拟本底天然有机物进行试验,采用UV-H₂O₂、O₃、UV-O₃3种高级氧化工艺,研究了水中腐殖酸对3种高级氧化联用技术去除饮用水中内分泌干扰物(DMP)的影响.结果表明,UV-H₂O₂联用工艺氧化DMP的过程符合伪一级反应动力学,水中腐殖酸的存在对UV-H₂O₂联用工艺氧化DMP的影响非常大,伪一级反应的速率常数与本底TOC值的关系式为K=0.162 0[TOC]₀^{-0.817 1};同时水中腐殖酸对UV-O₃联用工艺氧化DMP的效果影响比较大,而总体上腐殖酸对O₃氧化DMP的去除影响不大.从效果分析知,在一定浓度腐殖酸本底条件下单独O₃氧化和UV-O₃联用工艺对DMP的氧化均以O₃分子对DMP的氧化起主导作用,当腐殖酸浓度变小,UV-O₃联用工艺体系中.OH自由基氧化DMP的重要性增大.水中腐殖酸对3种高级氧化工艺的影响程度顺序依次为:UV-H₂O₂>UV-O₃>O₃.

Effects of Organic Pollutants in Drinking Water on the Removal of Dimethyl Phthalate by Advance Oxidation Processes

Humic acids were used to simulate natural organic compounds in water for the investigation of DMP oxidation by three different AOPs(advanced oxidation processes) of UV-H₂O₂,O₃ and UV-O₃.The results showed that pseudo-first-order reaction equation could describe the oxidation of DMP by UV-H₂O₂ perfectly,which was strongly affected humic acids in water.The relationship between pseudofirst-order reaction rate and TOC value could be expressed as K=0.162 0[TOC]₀^{-0.817 1}.It was also found that humic acids in the water exhibited obvious influence on the oxidation of DMP by UV-O₃.However,effect of humic acids on the oxidation of DMP by ozone was not obvious.It was also analyzed that oxidation of DMP was dominated by ozone oxidation both in ozonation process and UV-O₃ process;the importance of(·OH) in the oxidation of DMP was enhanced as the concentration of DMP decreased in UV-O₃ process.The degree of impact form humic acids towards different AOPs could be ranked in a decreasing order as UV-H₂O₂,UV-O₃,O₃.