Biodegradation of Acid Orange 7 and its auto-oxidative decolorization product in membrane-aerated biofilm reactor
Biodegradation of Acid Orange 7 and its auto-oxidative decolorization product in membrane-aerated biofilm reactor
复制标题
膜曝气生物膜反应器中酸性橙7及其自氧化脱色产物的生物降解
DOI：
10.1016/j.ibiod.2011.12.003
复制
发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
Tianming Lei
中科院分区：
文献类型：
--
作者：
Jing Wang;Guangfei Liu;Hong Lu;Ruofei Jin;Jiti Zhou;Tianming Lei
许多偶氮染料可以厌氧脱色为芳香胺，其中羟基与氨基邻位。这些芳香胺很容易自动氧化，导致产生更多顽固的化合物。首次在膜曝气生物膜反应器(MABR)中研究了酸性橙7(AO7)及其自氧化脱色产物的生物降解。研究发现，供氧压力对MABR的性能有显著影响。在最佳氧压为0.03 Mpa的条件下，AO7在6h内脱色率可达98%，出水保持无色稳定，COD的去除可达80%以上。然而，在常规厌氧-好氧(A/O)工艺中，黄色废水对COD的去除效率仅为57.8%。变性梯度凝胶电泳和16S rDNA基因测序分析表明，MABR厌氧污泥中存在多种能够脱色或耐受偶氮化合物的细菌。希瓦氏杆菌属用于MABR生物强化的XB菌在生物膜和悬浮污泥中均能保持优势，有利于芳香胺类物质的AO7脱色和好氧生物降解。这些结果表明，MABR在自氧化性芳香胺的生物降解中具有潜在的应用前景。
Many azo dyes could be decolorized anaerobically to aromatic amines with a hydroxy group in ortho-position to an amino group. These aromatic amines can easily auto-oxidize, resulting in the generation of more recalcitrant compounds. The biodegradation of Acid Orange 7 (AO 7) and its auto-oxidative decolorization product was explored in a membrane-aerated biofilm reactor (MABR) for the first time. It was found that oxygen supply pressure had a remarkable impact on the MABR performance. Under the optimal oxygen pressure 0.03MPa, AO 7 decolorization efficiency could reach 98% in 6h and the effluent kept colorless and stable with over 80% COD removal. However, in the conventional anaerobic–aerobic (A/O) process only 57.8% COD was removed with yellow effluent. Denaturing gradient gel electrophoresis and 16S rDNA gene sequencing analysis revealed diverse bacteria capable of decolorizing or tolerating azo compounds in the anaerobic sludge of MABR. Shewanella sp. XB used for MABR bioaugmentation could persist dominantly in both biofilm and suspended sludge, which was beneficial for the AO 7 decolorization and aerobic biodegradation of the produced aromatic amines. These results indicated that MABR has potential applications in the biodegradation of the auto-oxidative aromatic amines.
登录
查看更多内容
影响因子：
12.8
作者：
D. Méndez-Paz;F. Omil;Juan M. Lema
通讯作者：
D. Méndez-Paz;F. Omil;Juan M. Lema
影响因子：
5.1
作者：
McLean, J. S.;Pinchuk, G. E.;Beliaev, A. S.
通讯作者：
Beliaev, A. S.
微需氧条件下 Shewanella decolorationis S12 对纺织偶氮染料的生物降解
影响因子：
5
作者：
通讯作者：
--
影响因子：
3.5
作者：
B. Rittmann
通讯作者：
B. Rittmann
影响因子：
13.6
作者：
Guangfei Liu;Jing Wang;Hong Lu;Ruofei Jin;Ji-ti Zhou;Long Zhang
通讯作者：
Guangfei Liu;Jing Wang;Hong Lu;Ruofei Jin;Ji-ti Zhou;Long Zhang