使用芬顿试剂和光芬顿反应从高盐度废水中去除苯酚。

Phenol removal from high salinity effluents using Fenton's reagent and photo-Fenton reactions.

作者信息

Maciel R, Sant'Anna G L, Dezotti M

机构信息

Programma de Engenharia Quimica, COPPE/Universidade Federal do Rio de Janeiro, Post Office Box 68502, CEP 21945-970 Rio de Janeiro/RJ, Brazil.

出版信息

Chemosphere. 2004 Nov;57(7):711-9. doi: 10.1016/j.chemosphere.2004.07.032.

DOI:10.1016/j.chemosphere.2004.07.032

PMID:15488934

Abstract

The removal of pollutants in saline medium by the Fenton's reagent needs a more detailed investigation, since the presence of chloride may inhibit or retard degradation. Phenol was used as a model pollutant and the influence of some important process variables for the removal of total organic carbon and phenol were investigated, such as FeSO4 and H2O2 concentrations, pH and salinity. The reactivity of iron cations and alternative procedures of applying UV radiation (photo-Fenton) were evaluated. Phenol was fast and completely removed by the Fenton's process even in a high saline medium (50,000mg NaCll(-1)). However, TOC was only moderately or poorly removed in saline media, depending on the salt concentration. When the photo-Fenton process was used, mineralization was improved and high TOC removals were observed in moderately saline media (NaCl concentration < or =10,000mgl(-1)). For the highest NaCl concentration tested (50,000mgl(-1)) only a moderate TOC removal was observed (50%).

摘要

由于氯离子的存在可能会抑制或延缓降解，因此芬顿试剂在含盐介质中去除污染物需要更详细的研究。以苯酚作为模型污染物，研究了一些重要工艺变量对总有机碳和苯酚去除的影响，如硫酸亚铁和过氧化氢浓度、pH值和盐度。评估了铁阳离子的反应活性以及应用紫外线辐射的替代程序（光芬顿法）。即使在高含盐介质（50,000mg NaCl l⁻¹）中，苯酚也能通过芬顿法快速且完全去除。然而，根据盐浓度的不同，总有机碳在含盐介质中的去除率仅为中等或较低。当使用光芬顿法时，矿化作用得到改善，在中等含盐介质（氯化钠浓度≤10,000mg l⁻¹）中观察到较高的总有机碳去除率。对于测试的最高氯化钠浓度（50,000mg l⁻¹），仅观察到中等的总有机碳去除率（50%）。