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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Decomposition of 1,4-Dioxane by Advanced Oxidation and Biochemical Process
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Decomposition of 1,4-Dioxane by Advanced Oxidation and Biochemical Process

机译：高级氧化和生化过程分解1,4-二恶烷

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This study was undertaken to determine the optimal decomposition conditions when 1,4-dioxane was degraded using either the AOPs (Advanced Oxidation Processes) or the BAC-TERRA microbial complex. The advanced oxidation was operated with H_2O_2, in the range 4.7 to 51 mM, under 254 nm (25 W lamp) illumination, while varying the reaction parameters, such as the air flow rate and reaction time. The greatest oxidation rate (96%) of 1,4-dioxane was achieved with H_2O_2 concentration of 17 mM after a 2-hr reaction. As a result of this reaction, organic acid intermediates were formed, such as acetic, propionic and butyric acids. Furthermore, the study revealed that suspended particles, i.e., bio-flocs, kaolin and pozzolan, in the reaction were able to have an impact on the extent of 1,4-dioxane decomposition. The decomposition of 1,4-dioxane in the presence of bio-flocs was significantly declined due to hindered UV penetration through the solution as a result of the consistent dispersion of bio-particles. In contrast, dosing with pozzolan decomposed up to 98.8% of the 1,4-dioxane after 2 hr of reaction. Two actual wastewaters, from polyester manufacturing, containing 1,4-dioxane in the range 370 to 450 mg/L were able to be oxidized by as high as 100% within 15 min with the introduction of 100:200 (mg/L) Fe(Ⅱ):H_2O_2 under UV illumination. Aerobic biological decomposition, employing BAC-TERRA, was able to remove up to 90% of 1,4-dioxane after 15 days of incubation. In the meantime, the by-products (i.e., acetic, propionic and valeric acid) generated were similar to those formed during the AOPs investigation. According to kinetic studies, both photo-decomposition and biodegradation of 1,4-dioxane followed pseudo first-order reaction kinetics, with k = 5 x 10~(-4) s~(-1) and 2.38 x 10~(-6) s~(-1), respectively. It was concluded that 1,4-dioxane could be readily degraded by both AOPs and BAC-TERRA, and that the actual polyester wastewater containing 1,4-dioxane could be successfully decomposed under the conditions of photo-Fenton oxidation.
机译：进行这项研究以确定使用AOP（先进氧化工艺）或BAC-TERRA微生物复合物降解1,4-二恶烷时的最佳分解条件。在254 nm（25 W灯）照明下，在4.7至51 mM的H_2O_2范围内进行高级氧化，同时改变反应参数，例如空气流速和反应时间。反应2小时后，H_2O_2的浓度为17 mM，可实现1,4-二恶烷的最大氧化率（96％）。该反应的结果是形成有机酸中间体，例如乙酸，丙酸和丁酸。此外，研究表明，反应中的悬浮颗粒，即生物絮凝剂，高岭土和火山灰能够影响1,4-二恶烷的分解程度。在生物絮凝剂存在下1,4-二恶烷的分解由于生物颗粒的持续分散而阻碍了UV穿透溶液的能力而大大降低了。相反，在2小时的反应后，用火山灰的剂量分解了高达98.8％的1,4-二恶烷。聚酯生产中的两种实际废水中1,4-二恶烷的含量在370至450 mg / L的范围内，通过引入100：200（mg / L）的铁，可以在15分钟内将其氧化高达100％。 （Ⅱ）：H_2O_2的紫外线照射。孵育15天后，使用BAC-TERRA进行的需氧生物分解能够去除高达90％的1,4-二恶烷。同时，产生的副产物（即乙酸，丙酸和戊酸）与AOPs研究期间形成的副产物相似。根据动力学研究，1,4-二恶烷的光分解和生物降解均遵循拟一级反应动力学，k = 5 x 10〜（-4）s〜（-1）和2.38 x 10〜（-6） ）s〜（-1）。结论是，AOP和BAC-TERRA均可轻易降解1,4-二恶烷，而实际的含1,4-二恶烷的聚酯废水可在光芬顿氧化条件下成功分解。

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