Abstract:

The pretreatment effect of Fe⁰/O₃ system with zero-valent iron （Fe⁰） as the catalyst on lead-2，4，6-trinitroresorcinate styphnate wastewater was investigated， and the superiority of the Fe⁰/O₃ system was verified by control experiments. The results of UV-Vis spectral analysis showed that both benzene ring and nitro group were completely removed from the wastewater. The Fe⁰ before and after the reaction was characterized by SEM-EDS and XRD， indicating that a large amount of Fe⁰ corrosion products， such as Fe²⁺， Fe³⁺， iron oxide and iron hydroxide， were generated during the reaction. The mechanism study showed that the reduction of Fe⁰， direct oxidation of O₃ and catalytic oxidation of Fe⁰/O₃ all contributed to the removal of pollutants. The effects of experimental parameters on the treatment effect of lead-2，4，6-trinitroresorcinate styphnate wastewater were systematically investigated. Under the conditions of Fe⁰ dosage of 30 g/L， initial pH of 2， O₃ aeration rate of 1.0 L/min and reaction time of 120 min， the COD removal of lead-2，4，6-trinitroresorcinate styphnate wastewater reached 79%，the chroma was significantly reduced and B/C increased from 0.09 to 0.53. After five consecutive experiments， the COD removal rate of lead-2，4，6-trinitroresorcinate styphnate wastewater by Fe⁰/O₃ system still reached more than 70%.

Key words: zero valent iron, initiating explosive, ozonation, heterogeneous catalysis, industrial wastewater

摘要：

研究了以零价铁（Fe⁰）为催化剂的Fe⁰/O₃体系对三硝基间苯二酚铅废水的预处理效果，通过对照实验验证了Fe⁰/O₃体系的优越性。UV-Vis光谱分析结果表明，三硝基间苯二酚铅废水中的苯环和硝基均被完全去除。采用SEM-EDS和XRD对反应前后的Fe⁰进行表征，推断反应过程中产生大量Fe⁰的腐蚀产物（如Fe²⁺、Fe³⁺、铁的氧化物和氢氧化物等）。通过机理研究发现，Fe⁰的还原作用、臭氧的直接氧化和Fe⁰/O₃的催化氧化均对污染物的去除有贡献。系统探究了实验参数对三硝基间苯二酚铅废水处理效果的影响，结果表明：在Fe⁰添加量为30 g/L、初始pH为2、O₃曝气量为1.0 L/min、反应时间为120 min的条件下，三硝基间苯二酚铅废水的COD去除率达到79%，色度显著降低，B/C从0.09提高至0.53。经过5次连续实验，Fe⁰/O₃体系对三硝基间苯二酚铅废水的COD去除率依然可以达到70%以上。

关键词: 零价铁, 起爆药, 臭氧氧化, 非均相催化, 工业废水

CLC Number: 

• X703.1