This study investigated removal of triclocarban (TCC) from contaminated wastewater by Pseudomonas fluorescens strain MC46 entrapped in barium alginate. Appropriate entrapped cell preparation conditions (cell-to-entrapment material ratio and cell loading) for removing TCC were examined. The highest TCC removal by the entrapped and free cell systems at the initial TCC concentration of 10 mg/L was 72 and 45%, respectively. TCC was degraded to less toxic compounds. Self-substrate inhibition was found at TCC concentration of 30 mg/L. The kinetics of TCC removal by entrapped and free cells fitted well with Edwards model. Scanning and transmission electron microscopic observations revealed that entrapment matrices reduced TCC-microbe contact, which lessened TCC inhibition. A live/dead cell assay also confirmed reduced microbial cell damage in the entrapped cell system compared to the free cell system. This study reveals the potential of entrapment technology to improve antibiotic removal from the environment.

译文

这项研究调查了捕获在藻酸钡中的荧光假单胞菌MC46菌株从受污染的废水中去除三氯卡班 (TCC)。检查了用于去除TCC的适当的包埋细胞制备条件 (细胞与包埋材料的比率和细胞负载量)。在初始TCC浓度为10 mg/L时,截留的和游离的细胞系统对TCC的最高去除分别为72和45%。TCC降解为毒性较低的化合物。在TCC浓度为30  mg/L时发现了自底物抑制作用。截留和游离细胞去除TCC的动力学与Edwards模型非常吻合。扫描和透射电子显微镜观察表明,包封基质减少了TCC-微生物的接触,从而减轻了TCC的抑制作用。与游离细胞系统相比,活/死细胞分析还证实了被捕获的细胞系统中微生物细胞损伤的减少。这项研究揭示了包封技术在改善从环境中去除抗生素方面的潜力。

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