Decomposition of 1,4-dioxane by advanced oxidation and biochemical process
Decomposition of 1,4-dioxane by advanced oxidation and biochemical process
复制标题
DOI：
10.1080/10934520600574807
复制
发表时间：
2006-01-01
影响因子：
2.1
通讯作者：
Lee, BR
中科院分区：
文献类型：
--
作者：
Kim, CG;Seo, HJ;Lee, BR
本研究旨在确定高级氧化工艺（AOP（S））和BAC-TERRA微生物复合体降解1，4-二氧六环的最佳条件。在254 nm（25 W灯）照射下，用范围为4.7至51 mM的H2 O2操作高级氧化，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，H2 O2浓度为17 mM时，1，4-二氧六环的氧化率最高（96%）。作为该反应的结果，形成有机酸中间体，例如乙酸、丙酸和丁酸。此外，该研究表明，悬浮颗粒，即，反应中的生物絮凝物、高岭土和火山灰能够对1，4-二氧六环分解的程度产生影响。在生物絮凝物存在下，1，4-二氧六环的分解显著下降，这是由于生物颗粒的一致分散阻碍了UV穿透溶液。相比之下，投加火山灰在反应2小时后分解高达98.8%的1，4-二氧六环。两个实际的废水，从聚酯生产，含有1，4-二氧六环在370至450毫克/升的范围内，能够被氧化高达100%，在15分钟内与100：200（mg/L）的Fe（II）：H2 O2在紫外线照射下，好氧生物分解，采用BAC-TERRA，能够去除高达90%的1，4-二氧六环后，15天的温育。与此同时，副产品（即，乙酸、丙酸和戊酸）与AOPS研究期间形成的那些类似。动力学研究表明，1，4-二氧六环的光降解和生物降解均符合准一级反应动力学，k分别为5 × 10（-4）s（-1）和2.38 × 10（-6）s（-1）。在光-Fenton氧化条件下，4-二氧六环可被成功降解。
This study was undertaken to determine the optimal decomposition conditions when 1,4-dioxane was degraded using either the AOP(S) (Advanced Oxidation Processes) or the BAC-TERRA microbial complex. The advanced oxidation was operated with H2O2, 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 H2O2 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):H2O2 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.