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The effect of cyclic anaerobic-aerobic conditions on biodegradation of azo dyes

机译：循环厌氧-好氧条件对偶氮染料生物降解的影响

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The effect of cyclic anaerobic-aerobic conditions on the biodegradative capability of the mixed microbial culture for the azo dye Remazol Brilliant Violet 5R (RBV-5R) was investigated in the sequencing batch reactor (SBR) fed with a synthetic textile wastewater. The SBR had a 12-h cycle time with anaerobic-aerobic periods of 3/9, 6/6 and 9/3 h. General SBR performance was assessed by measurement of catabolic enzymes (catechol 2,3-dioxygenase, azo reductase), chemical oxygen demand (COD), color and amount of aromatic amines. In this study, under steady-state conditions, the anaerobic period of the cyclic SBR was found to allow the reductive decolorization of azo dye. Longer anaerobic periods resulted in higher color removal efficiencies, approximately 71 % for the 3-h, 87% for 6-h and 92% for the 9-h duration. Total COD removal efficiencies were over 84% under each of the cyclic conditions and increased as the length of the anaerobic period was increased; however, the highest color removal rate was attained for the cycle with the shortest anaerobic period of 3 h. During the decolorization of RB V-5R, two sulfonated aromatic amines (benzene based and naphthalene based) were formed. Additionally, anaerobic azo reductase enzyme was found to be positively affected with the increasing duration of the anaerobic period; however; it was vice versa for the aerobic catechol 2,3-dioxygenase (C23DO) enzyme.
机译：循环厌氧-好氧条件对混合微生物培养物对偶氮染料Remazol Brilliant Violet 5R（RBV-5R）的生物降解能力的影响是在装有合成纺织废水的测序分批反应器（SBR）中进行的。 SBR的循环时间为12小时，厌氧-好氧时间为3 / 9、6 / 6和9/3 h。通过测量分解代谢酶（邻苯二酚2,3-二加氧酶，偶氮还原酶），化学需氧量（COD），芳香族胺的颜色和数量来评估SBR的总体性能。在这项研究中，在稳态条件下，发现环状SBR的厌氧期可以使偶氮染料还原脱色。更长的厌氧时间导致更高的脱色效率，3小时约71％，6小时约87％，9小时约92％。在每种循环条件下，总COD去除效率均超过84％，并且随着厌氧时间长度的增加而增加；但是，该循环的除色率最高，厌氧时间最短为3小时。在RB V-5R脱色过程中，形成了两种磺化芳族胺（苯基和萘基）。另外，发现厌氧的偶氮还原酶随着厌氧时间的延长而受到积极影响。然而;反之，好氧儿茶酚2,3-二加氧酶（C23DO）则相反。

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