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首页> 外文期刊>Environmental Science & Technology >Induction of Microbial Oxidative Stress as a New Strategy to Enhance the Enzymatic Degradation of Organic Micropollutants in Synthetic Wastewater
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Induction of Microbial Oxidative Stress as a New Strategy to Enhance the Enzymatic Degradation of Organic Micropollutants in Synthetic Wastewater

机译：诱导微生物氧化应激作为增强合成废水中有机微污染物酶促降解的新策略

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摘要

Organic micropollutants (OMPs) are pervasive anthropogenic contaminants of receiving waters where they can induce various adverse effects to aquatic life. Their ubiquitous environmental occurrence is primarily attributed to discharge from wastewater treatment plants due to incomplete removal by common biological wastewater treatment processes. Here, we assess a new strategy for promoting the degradation of six representative OMPs (i.e., sulfamethoxazole, carbamazepine, tylosin, atrazine, naproxen, and ibuprofen) by intentionally stimulating the production of microbial oxidoreductases to counter oxidative stress caused by oxygen perturbations. Mixed microbial cultures from a dairy farm wastewater were subjected to cyclic perturbations of dissolved oxygen (DO). A distance-based redundancy analysis was used to show that DO perturbations correlate with the abundance of Pseudomonadaceae and Rhodocyclaceae families, activities of peroxidases and cytochromes, and the degradation of OMPs. DO perturbation of 0.25 and 0.5 cycles/h led to most abundance of Pseudomonadaceae and Rhodocyclaceae families, showed higher activity of peroxidase and cytochrome, and gave largest removal of OMPs (removal of 92 +/- 3% for sulfamethoxazole, 84 +/- 3% for naproxen, 82 +/- 3% for ibuprofen, 66 +/- 2% for carbamazepine, 57 +/- 15% for tylosin, and 88 +/- 1% for atrazine).
机译：有机微污染物（OMPs）是接收水的普遍的人为污染物，它们可以对水生生物造成各种不利影响。它们无处不在的环境发生主要归因于由于普通生物废水处理工艺未完全清除而导致的废水处理厂排放。在这里，我们通过有意刺激微生物氧化还原酶的产生来对抗由氧气扰动引起的氧化应激，从而评估了促进六种代表性OMP（即磺胺甲恶唑，卡马西平，泰乐菌素，阿特拉津，萘普生和布洛芬）降解的新策略。来自奶牛场废水的混合微生物培养物受到溶解氧（DO）的周期性扰动。基于距离的冗余分析用于显示DO扰动与假单胞菌科和红景天科的丰富度，过氧化物酶和细胞色素的活性以及OMP的降解有关。每小时0.25和0.5个周期的DO扰动会导致假单胞菌科和红景天科家族数量最多，显示过氧化物酶和细胞色素的活性更高，并且OMP去除率最高（磺胺甲恶唑的去除率为92 +/- 3％，磺胺甲恶唑的去除率为84 +/- 3萘普生为％，布洛芬为82 +/- 3％，卡马西平为66 +/- 2％，泰乐菌素为57 +/- 15％，阿特拉津为88 +/- 1％）。

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