超声强化零价铁活化过硫酸盐降解地下水中二恶烷

本文采用超声强化零价铁活化过硫酸盐氧化降解地下水中的二恶烷污染物。主要探讨了零价铁添加量、超声强化、不同过硫酸盐用量及地下水中不同碳酸根浓度等对二恶烷降解效果的影响，并对零价铁进行了表征分析。结果表明：超声能够促进硫酸根自由基和Fe²⁺的产生，提高二恶烷的降解率；零价铁添加量和过硫酸盐浓度的增加均能促进二恶烷的降解，但零价铁相对过硫酸盐过多时将降低最终降解率；地下水中的碳酸根会消耗硫酸根自由基，因此碳酸根浓度越高，二恶烷降解率越低。超声强化零价铁活化过硫酸盐氧化法能够有效降解二恶烷，并具有应用于处理地下水中二恶烷的潜力。

Degradation of 1,4-Dioxane in Groundwater by Ultrasound Enhanced ZVI-Activated Persulfate Oxidation Process

Ultrasound enhanced zero-valent iron (ZVI) activated persulfate process to degrade 1,4-dioxane in groundwater was studied, and the effects of ultrasound, ZVI dosage, concentration of persulfate and carbonate ions were also investigated. ZVI was characterized by X-ray photo electron spectroscopy (XPS) and scanning electron microscope (SEM). The results show that ultrasound can accelerate the generation of sulfate radicals and Fe²⁺, and enhance the degradation of 1,4-dioxane. The degradation efficiency can be increased through increasing ZVI dosage and persulfate concentration;however, the final degradation efficiency of 1,4-dioxane decreases when Fe⁰ dosage is much more than persulfate. The presence of carbonate ions in groundwater reduces the concentration of sulfate radicals, thus the efficiency of 1,4-dioxane degradation decreases with the increase of carbonate concentration. In conclusion, ultrasound enhanced ZVI-activated persulfate process can effectively degrade 1,4-dioxane, is a promising method in the treatment of 1,4-dioxane in groundwater.