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Oerskovia paurometabola can efficiently decolorize azo dye Acid Red 14 and remove its recalcitrant metabolite.
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2019-11-30 , DOI: 10.1016/j.ecoenv.2019.110007 Rita Dias Guardão Franca 1 , Anabela Vieira 2 , Gilda Carvalho 3 , Adrian Oehmen 3 , Helena Maria Pinheiro 1 , Maria Teresa Barreto Crespo 2 , Nídia Dana Lourenço 1
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2019-11-30 , DOI: 10.1016/j.ecoenv.2019.110007 Rita Dias Guardão Franca 1 , Anabela Vieira 2 , Gilda Carvalho 3 , Adrian Oehmen 3 , Helena Maria Pinheiro 1 , Maria Teresa Barreto Crespo 2 , Nídia Dana Lourenço 1
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The biodegradation of dyes remains one of the biggest challenges of textile wastewater. Azo dyes are one of the most commonly employed dye classes, and biological treatment processes tend to generate recalcitrant aromatic amines, which are more toxic than the parent dye molecule. This study aimed to isolate bacterial strains with the capacity to degrade both the azo dye and the resulting aromatic amines towards the development of a simple and reliable treatment approach for dye-laden wastewaters. A mixed bacterial enrichment was first developed in an anaerobic-aerobic lab-scale sequencing batch reactor (SBR) fed with a synthetic textile wastewater containing the model textile azo dye Acid Red 14 (AR14). Eighteen bacterial strains were isolated from the SBR, including members of the Acinetobacter, Pseudomonas and Oerskovia genera, Oerskovia paurometabola presenting the highest decolorization capacity (91% after 24 h in static anaerobic culture). Growth assays supported that this is a facultative bacterium, and decolorization batch tests with 20-100 mg AR14 L-1 in a synthetic textile wastewater supplemented with yeast extract indicated that O. paurometabola has a high color removal capacity for a significant range of AR14 concentrations. In addition, a model typically used to describe biodegradation of xenobiotic compounds was adjusted to the results, to predict AR14 biodegradation time profiles at different initial concentrations. HPLC analysis confirmed that decolorization occurred through azo bond reduction under anaerobic conditions, the azo dye being completely reduced after 24 h of anaerobic incubation for the range of concentrations tested. Interestingly, partial (up to 63%) removal of one of the resulting aromatic amines (4-amino-naphthalene-1-sulfonic acid) was observed when subsequently subjected to aerobic conditions. Overall, this work showed the azo dye biodegradation potential of specific bacterial strains isolated from mixed culture bioreactors, reporting for the first time the decolorization capacity of an Oerskovia sp. with further biodegradation of a recalcitrant sulfonated aromatic amine metabolite.
中文翻译：
厄氏泡桐可以有效地使偶氮染料酸性红14脱色并除去其顽强的代谢产物。
染料的生物降解仍然是纺织废水的最大挑战之一。偶氮染料是最常用的染料类别之一，并且生物处理过程倾向于生成顽固的芳族胺，其比母体染料分子毒性更大。这项研究旨在分离具有降解偶氮染料和所得芳香胺能力的细菌菌株，从而为染染料废水开发一种简单可靠的处理方法。混合细菌富集首先在厌氧-好氧实验室规模的测序分批反应器（SBR）中开发，该反应器供入含有模型纺织品偶氮染料酸性红14（AR14）的合成纺织品废水。从SBR中分离出18个细菌菌株，包括不动杆菌属，假单胞菌属和Oerskovia属，奥斯曼高棉（Oerskovia paurometabola）表现出最高的脱色能力（在静态厌氧培养24小时后为91％）。生长测定法证明这是一种兼性细菌，在添加酵母提取物的合成纺织废水中用20-100 mg AR14 L-1进行脱色批处理试验表明，古朴的O. paurometabola对很大范围的AR14浓度都具有较高的脱色能力。 。另外，将通常用于描述异种生物化合物生物降解的模型调整为结果，以预测不同初始浓度下AR14生物降解的时间曲线。HPLC分析证实在厌氧条件下通过偶氮键还原而发生脱色，在所测试的浓度范围内，厌氧孵育24小时后，偶氮染料被完全还原。有趣的是，随后在有氧条件下观察到部分（最多63％）去除了一种芳香胺（4-氨基-萘-1-磺酸）。总的来说，这项工作显示了从混合培养生物反应器中分离出的特定细菌菌株的偶氮染料生物降解潜力，这首次报道了Oerskovia sp。的脱色能力。并进一步降解顽固性磺化芳族胺代谢物。
更新日期：2019-11-30
中文翻译：
厄氏泡桐可以有效地使偶氮染料酸性红14脱色并除去其顽强的代谢产物。
染料的生物降解仍然是纺织废水的最大挑战之一。偶氮染料是最常用的染料类别之一，并且生物处理过程倾向于生成顽固的芳族胺，其比母体染料分子毒性更大。这项研究旨在分离具有降解偶氮染料和所得芳香胺能力的细菌菌株，从而为染染料废水开发一种简单可靠的处理方法。混合细菌富集首先在厌氧-好氧实验室规模的测序分批反应器（SBR）中开发，该反应器供入含有模型纺织品偶氮染料酸性红14（AR14）的合成纺织品废水。从SBR中分离出18个细菌菌株，包括不动杆菌属，假单胞菌属和Oerskovia属，奥斯曼高棉（Oerskovia paurometabola）表现出最高的脱色能力（在静态厌氧培养24小时后为91％）。生长测定法证明这是一种兼性细菌，在添加酵母提取物的合成纺织废水中用20-100 mg AR14 L-1进行脱色批处理试验表明，古朴的O. paurometabola对很大范围的AR14浓度都具有较高的脱色能力。 。另外，将通常用于描述异种生物化合物生物降解的模型调整为结果，以预测不同初始浓度下AR14生物降解的时间曲线。HPLC分析证实在厌氧条件下通过偶氮键还原而发生脱色，在所测试的浓度范围内，厌氧孵育24小时后，偶氮染料被完全还原。有趣的是，随后在有氧条件下观察到部分（最多63％）去除了一种芳香胺（4-氨基-萘-1-磺酸）。总的来说，这项工作显示了从混合培养生物反应器中分离出的特定细菌菌株的偶氮染料生物降解潜力，这首次报道了Oerskovia sp。的脱色能力。并进一步降解顽固性磺化芳族胺代谢物。
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