Department of Chemical Engineering, Complutense University of Madrid, Facultad de Ciencias Químicas, Ciudad Universitaria s/n, 28040 Madrid, Spain.
J Hazard Mater. 2014 Mar 15;268:102-9. doi: 10.1016/j.jhazmat.2014.01.008. Epub 2014 Jan 9.
1,4-Dioxane is a non-biodegradable, toxic, hazardous, and priority pollutant widely used in the chemical industry as a solvent; as well as it is a resulting by-product of many industrial processes. The optimization of the Fenton treatment of 1,4-dioxane, and the on-line FTIR monitoring of its degradation route, including the assessment of the enhancement of the biodegradability of the solution along treatment are herein addressed. Besides the full removal of 1,4-dioxane, an 80% reduction of the chemical oxygen demand (COD) was achieved at the best tested treatment conditions. Whether the used concentration of H2O2 was expectedly addressed as the reaction factor most influencing the achieved COD removal at the end of the process; the performance of the treatment under acid pH conditions showed to have just a slight influence, thus supporting this process may suitably be performed at neutral pH value. On-line FTIR monitoring of the process novelly provided the degradation route of 1,4-dioxane along its oxidation treatment, as well as a comprehensive optimization of the Fenton process based on the increase of the biodegradability of the solution and the reduction of the consumption of reagents.
1,4-二恶烷是一种不可生物降解、有毒、有害且优先控制的污染物，广泛用于化学工业作为溶剂；也是许多工业过程的副产物。本文旨在优化 Fenton 处理 1,4-二恶烷的条件，并在线监测其降解途径的傅里叶变换红外光谱（FTIR），包括评估处理过程中溶液可生物降解性的增强。除了完全去除 1,4-二恶烷外，在最佳测试处理条件下，化学需氧量（COD）也降低了 80%。在处理过程结束时，H2O2 的使用浓度显然被认为是影响 COD 去除率的主要反应因素；在酸性 pH 条件下处理的性能影响较小，这表明该过程可在中性 pH 值下适当进行。在线 FTIR 监测过程新颖地提供了 1,4-二恶烷在氧化处理过程中的降解途径，以及基于溶液可生物降解性增加和试剂消耗减少的 Fenton 过程的全面优化。
