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首页> 外文期刊>Archives of Animal Nutrition >Solar photocatalysis as disinfection technique: Inactivation of Klebsiella pneumoniae in sewage and investigation of changes in antibiotic resistance profile
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Solar photocatalysis as disinfection technique: Inactivation of Klebsiella pneumoniae in sewage and investigation of changes in antibiotic resistance profile

机译：太阳能光催化作为消毒技术：在污水和抗生素抗性曲线变化的污水中失败肺炎肺炎

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The presence of pathogenic microorganisms in wastewater and their resistant nature to antibiotics impose effective disinfection treatment for public health and environmental protection. In this work, photocatalysis with metal-doped titania under artificial and natural sunlight, chlorination and UV-C irradiation were evaluated for their potential to inactivate Klebsiella pneumoniae in real wastewater. Their overall effect on antibiotic resistance profile and target antibiotic resistance genes (ARGs) was also investigated. In particular, Mn-, Co- and binary Mn/Co-TiO2 were tested resulting in bacterial decrease from 4 to 6 Logs upon 90 min of exposure to simulated solar irradiation. The response of catalysts under natural solar light was insufficient, as only a 2 Log reduction was recorded even after 60 min of treatment. The relative activity of the applied methods for K. pneumoniae inactivation was decreased in the order: photocatalysis with the binary Co/Mn-TiO2 under artificial light > chlorination with dose of 5 mg/L of free chlorine > UV-C irradiation, at an initial bacterial concentration of 10(7) CFU/mL. The applied methods showed various effects on antibiotic resistance profile in residual cells. Among the tested antibiotics (ampicillin, cefaclor, sulfamethoxazole and tetracycline), considerable changes in MIC values were recorded for cefaclor and tetracycline. Resistance of surviving cells after treatment remained in high levels, reflecting the abundance of the corresponding target ARGs, namely tetA, tetM, sul1, blaTEM and ampC. The notable presence of target ARGs post disinfection raises concerns and makes wastewater effluent a carrier of antibiotic resistance elements into the aquatic environment. (C) 2016 Elsevier Ltd. All rights reserved.
机译：废水中致病微生物的存在及其对抗生素的抗性本质对公共卫生和环境保护有效的消毒治疗。在这项工作中，评价了在人工和自然阳光下的金属掺杂二氧化钛，氯化和UV-C辐射的光催化，以便它们在真正废水中灭活Klebsiella肺炎的潜力。还研究了它们对抗生素抗性曲线和靶抗生素抗性基因（ARGS）的总体影响。特别是，在暴露于模拟太阳照射的90分钟内，测试Mn-，共同Mn / Co-TiO 2导致4至6原木的细菌降低。在天然太阳光下催化剂的响应不足，因为即使在治疗60分钟后也只记录了2个对数减少。 K.肺炎肺炎灭活的应用方法的相对活性是按顺序减少：在人造光下的二元CO / MN-TiO2下的光催化>氯化剂量为5mg / L的游离氯> UV-C照射。初始细菌浓度为10（7）cfu / ml。所应用的方法对残留细胞中的抗生素抗性分布显示了各种影响。在测试的抗生素（氨苄青霉素，头孢甲，磺胺嘧唑和四环素）中，记录了MIC值的显着变化，用于头孢酰胺和四环素。存活细胞的抗性在治疗后保持高水平，反映了相应的靶标，即TETA，TETM，SUL1，BLATEM和AMPC的丰富。靶标Args后消毒的显着存在提出了令人担忧的问题，并使废水流出物流抗生素抗性元素载体进入水生环境。 （c）2016 Elsevier Ltd.保留所有权利。

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