软木制造废水的光氧化

Photo-oxidation of cork manufacturing wastewater.

作者信息

Silva Carla A, Madeira Luis M, Boaventura Rui A, Costa Carlos A

机构信息

Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.

出版信息

Chemosphere. 2004 Apr;55(1):19-26. doi: 10.1016/j.chemosphere.2003.11.018.

DOI:10.1016/j.chemosphere.2003.11.018

PMID:14720542

Abstract

Several photo-activated processes have been investigated for oxidation of a cork manufacturing wastewater. A comparative activity study is made between different homogeneous (H2O2/UV-Vis and H2O2/Fe2+/UV-Vis) and heterogeneous (TiO2/UV-Vis and TiO2/H2O2/UV-Vis) systems, with degradation performances being evaluated in terms of total organic carbon (TOC) removal. Results obtained in a batch photo-reactor show that photo-catalysis with TiO2 is not suitable for this kind of wastewater while the H2O2/UV-Vis oxidation process, for which the effect of some operating conditions was investigated, allows to remove 39% of TOC after 4 h of operation (for C(H2O2)=0.59 M, pH=10 and T=35 degrees C). The combined photo-activated process, i.e., using both TiO2 and H2O2, yields an overall TOC decrease of 46% (for C(TiO2)=1.0 gl(-1)). The photo-Fenton process proved to be the most efficient, proceeds at a much higher oxidation rate and allows to achieve 66% mineralization in just 10 min of reaction time (for C(H2O2)=0.31 M, T=30 degrees C, Fe2+:H2O2=0.12 (mol) and pH=3.2).

摘要

已经对几种光活化过程用于软木制造废水的氧化进行了研究。对不同的均相体系（H2O2/紫外-可见光谱和H2O2/Fe2+/紫外-可见光谱）和非均相体系（TiO2/紫外-可见光谱和TiO2/H2O2/紫外-可见光谱）进行了对比活性研究，并根据总有机碳（TOC）去除率评估降解性能。在间歇式光反应器中获得的结果表明，TiO2光催化不适用于这类废水，而研究了一些操作条件影响的H2O2/紫外-可见光谱氧化过程，在运行4小时后可去除39%的TOC（对于C(H2O2)=0.59 M、pH=10和T=35摄氏度）。联合光活化过程，即同时使用TiO2和H2O2，使TOC总体降低了46%（对于C(TiO2)=1.0 gl(-1)）。光芬顿过程被证明是最有效的，以更高的氧化速率进行，并且在仅10分钟的反应时间内就能实现66%的矿化（对于C(H2O2)=0.31 M、T=30摄氏度、Fe2+:H2O2=0.12（摩尔）和pH=3.2）。