ABSTRACT

The degradation of persistent organic pollutants (POPs) in the simulated wastewaters was investigated by Fe-C micro-electrolysis system. With phenanthrene (PHE) and 2,4-dichlorophenol (2,4-DCP) as target pollutants, different iron-carbon (Fe-C) micro-electrolysis systems have been established. The effects of initial pH, Fe/C mass ratio, and intake air flow on the degradation and mineralization of PHE and 2,4-DCP were studied. At the initial pH of 5.0, Fe/C of 1.5:1, and an aeration flow rate of 1.5 L/min, after 120 min of reaction, the removal efficiency of FHE and COD was 94.3% and 73%, respectively. Under the conditions of initial pH is 3.0, Fe/C is 1:2, aeration flow rate of 1.5 L/min, and reaction time of 90 min, the best removal efficiency of 2,4-DCP can be obtained in the Fe-C micro-electrolysis system as 97% and COD removal efficiency can reach 76%. The results of kinetic studies show that the Fe-C micro-electrolysis process of PHE and 2,4-DCP follows pseudo-first-order kinetics. Commercial activated carbon (AC) was used for comparison under the same condition. The results indicated that the removal rate of organic pollutants and chemical oxygen demand (COD) of Fe-C micro-electrolysis were superior to that of AC. Analyze the structure of iron after reaction by SEM and XRD. The degradation pathway and mechanism for PHE and 2,4-DCP were proposed based on LC-MS analyses of treated wastewater.

摘要

采用Fe-C微电解系统研究了模拟废水中持久性有机污染物（POPs）的降解情况。以菲（PHE）和2,4-二氯苯酚（2,4-DCP）为目标污染物，建立了不同的铁碳（Fe-C）微电解系统。研究了初始pH、Fe/C质量比和进气流量对PHE和2,4-DCP降解和矿化的影响。在初始pH为5.0、Fe/C为1.5:1、曝气流量为1.5 L/min时，反应120 min后，FHE和COD的去除率分别为94.3%和73%。在初始pH为3.0、Fe/C为1:2、曝气流量为1.5 L/min、反应时间为90 min的条件下，最佳去除效率为2，Fe-C微电解系统中4-DCP的获得率可达97%，COD去除率可达76%。动力学研究结果表明，PHE和2,4-DCP的Fe-C微电解过程遵循准一级动力学。在相同条件下使用商业活性炭（AC）进行比较。结果表明，Fe-C微电解对有机污染物和化学需氧量（COD）的去除率优于AC。通过SEM和XRD分析反应后铁的结构。基于处理后废水的 LC-MS 分析，提出了 PHE 和 2,4-DCP 的降解途径和机理。在相同条件下使用商业活性炭（AC）进行比较。结果表明，Fe-C微电解对有机污染物和化学需氧量（COD）的去除率优于AC。通过SEM和XRD分析反应后铁的结构。基于处理后废水的 LC-MS 分析，提出了 PHE 和 2,4-DCP 的降解途径和机理。在相同条件下使用商业活性炭（AC）进行比较。结果表明，Fe-C微电解对有机污染物和化学需氧量（COD）的去除率优于AC。通过SEM和XRD分析反应后铁的结构。基于处理后废水的 LC-MS 分析，提出了 PHE 和 2,4-DCP 的降解途径和机理。