Centralised Waste Management Facility, Bhabha Atomic Research Centre Facilities, Kalpakkam 603 102, India.
Environ Sci Pollut Res Int. 2012 Mar;19(3):871-8. doi: 10.1007/s11356-011-0619-9. Epub 2011 Sep 27.
In the nuclear industry 1,4-dioxane is used as a solvent in liquid scintillation technique for measuring low-energy beta-emitters such as ³H or C¹⁴ in aqueous media. Improper disposal of 1,4-dioxane can contaminate the ground and surface waters. Conventional wastewater treatment processes like chemical treatment, air stripping, carbon adsorption, and biological treatment are ineffective for the degradation of 1,4-dioxane.
In the present study, the kinetics of degradation of 1,4-dioxane using advanced oxidation processes viz., H₂O₂ alone, Fe(II) + H₂O₂, UV (15 W) + H₂O₂, UV (15 W) + Fe(II) + H₂O₂, US (130 KHz) + Fe(II) + H₂O₂, and sunlight + Fe(II) + H₂O₂ at pH 3.0 was investigated. The optimization of Fe (II) for the processes using Fe (II) + H₂O₂ was carried out.
The kinetics of degradation using sunlight + Fe (II) + H₂O₂ was found to be fastest when compared to the other processes. The degradation was found to follow first-order kinetics. Formation of acidic intermediates was suspected from the observed pH changes during the degradation processes.
在核工业中，1,4-二恶烷被用作液体闪烁技术中的溶剂，用于测量水相中的低能β发射体，如 ³H 或 C¹⁴。1,4-二恶烷的不当处置会污染地下水和地表水。传统的废水处理工艺，如化学处理、空气吹脱、碳吸附和生物处理，对于 1,4-二恶烷的降解都无效。
在本研究中，使用高级氧化工艺（单独的 H₂O₂、Fe(II)+H₂O₂、UV（15 W）+H₂O₂、UV（15 W）+Fe(II)+H₂O₂、US（130 KHz）+Fe(II)+H₂O₂和阳光+Fe(II)+H₂O₂）研究了 1,4-二恶烷的降解动力学。使用 Fe(II)+H₂O₂ 对 Fe(II) 进行了工艺优化。
与其他工艺相比，使用阳光+Fe(II)+H₂O₂ 的降解动力学最快。降解过程符合一级动力学。在降解过程中观察到 pH 值的变化，怀疑形成了酸性中间产物。
