紫外辐射H2O2与PMS氧化准好氧矿化垃圾床渗滤液尾水

体系过程有机物降解有抑制作用并且对 2 体系的抑制尤为显著.在最优条件下(初始 pH 值为 3,氧化剂投量为 0.084mol/L),UV-H2O2 与 UV-PMS
体系处理后出水 COD 去除率分别达到了 72.09%和 56.22%.另外,UV-H2O2 体系中主要活性氧物种是羟基自由基,而 UV-PMS 体系中主要是由羟基自由
水(UV-H2O2)和紫外辐射过一硫酸盐(UV-PMS)体系对有机污染物的降解相比于单独体系效果显著.初始 pH 值和氧化剂投加量能够显著影响 2 种体系
的降解效能,增加氧化剂投加量能够一定程度提高 2 种体系对渗滤液尾水中有机物的去除;2 种体系均在酸性条件下效果较好,初始 pH 值的升高对 2 种
基和硫酸根自由基的共同作用.紫外-可见光谱与三维荧光光谱表明两体系中均能降解渗滤液尾水中难降解芳香类有机物质,并且 UV-PMS 较
UV-H2O2 体系对腐殖质的反应速率更快,但是两种体系对渗滤液尾水中腐殖质的降解途径存在显著差异.研究结果可为光化学氧化处理垃圾渗滤液中
难降解有机物提供参考.
关键词：紫外-过氧化氢；紫外-过一硫酸盐(UV-PMS)；准好氧矿化垃圾床；垃圾渗滤液；自由基
中国环境科学 2019,39(9)：3744~3753
China Environmental Science
紫外辐射 H2O2 与 PMS 氧化准好氧矿化垃圾床渗滤液尾水
冯 梅,陈炜鸣,潘旭秦,李启彬 1*,刘 丹 (西南交通大学地球科学与环境工程学院,四川 成都 611756)
摘要：采用紫外(UV)活化双氧水(H2O2)和过一硫酸盐(PMS)产生活性氧物种降解准好氧矿化垃圾床渗滤液尾水中有机污染物.结果表明,紫外辐射双氧
中图分类号：X703.1
文献标识码：A
文章编号：1000-6923(2019)09-3744-10
Comparative study on UV-H2O2 and UV-PMS process oxidation of semi-aerobic aged refuse bioreactor leachate tail water. FENG Mei, CHEN Wei-ming, PAN Xu-qing, LI Qi-bin*, LIU Dan. (College of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China). China Environmental Science, 2019,39(9)：3744~3753 Abstract：Ultraviolet (UV) activated hydrogen peroxide (H2O2) and peroxymonosulfate (PMS) that produce various reactive oxygen species (ROS) were used to decompose the organic pollutants of semi-aerobic aged refuse bioreactor leachate tail water. The results showed that the degradation efficacies of organic pollutants in ultraviolet activated hydrogen peroxide (UV-H2O2) and ultraviolet activated peroxymonosulfate (UV-PMS) process is significantly better than those of single process. Factors including initial pH and oxidant dosage influenced the degradation efficiency greatly and increasing the concentration of oxidant favored the removal efficiency of organic pollutants in both two processes. Meanwhile, acidic ambient benefited the removal of organic pollutants, however, the removal efficiency of organic pollutants was reduced by increasing initial pH, especially in UV-H2O2 process. Under optimized conditions (initial pH value is 3, oxidant dosage is 0.084mol/L), 72.09% and 56.22% COD removal efficiencies were yielded by UV-H2O2 and UV-PMS processes, respectively. In addition, hydroxyl radical is the main ROS in UV-H2O2 process, while mostly hydroxyl radical and sulfate radical both work in UV-PMS process. The refractory aromatic compounds organics (i.e., humus) were degraded of leachate tail water in both two systems according to the results of ultraviolet-visible spectra and three-dimensional fluorescence spectrum. However, the transformation of humus in the two processes is quite different, and the degradation rate of humus in UV-PMS was more efficient than in that one. The study provides a valuable reference for recalcitrant organic degradation in landfill leachate by photochemical oxidation process. Key words：UV-H2O2；UV-PMS；semi-aerobic aged refuse bioreactor；landfill leachate；free radical