Investigation of acute effects of graphene oxide on wastewater microbial community: A case study
Investigation of acute effects of graphene oxide on wastewater microbial community: A case study
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DOI：
10.1016/j.jhazmat.2013.03.064
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发表时间：
2013-07-15
影响因子：
13.6
通讯作者：
Rodrigues, Debora F.
中科院分区：
文献类型：
--
作者：
Ahmed, Farid;Rodrigues, Debora F.
到2020年，氧化石墨烯(GO)等基于石墨烯的产品的市场预计将达到近6.75亿美元，因此预计届时将产生大量基于石墨烯的废物。废水处理厂将是这些废物的最终储存库之一。有效的废物处理在很大程度上依赖于各种微生物群落的功能。因此，对GO在废水微生物群落中的任何潜在毒性效应进行系统调查，对于确定这些纳米材料在环境中的潜在不利影响和命运是至关重要的。在本研究中，我们研究了GO的急性毒性，即短期和高负荷，对生物污水处理过程中相关微生物功能的影响。结果表明，GO对微生物群落的毒性作用具有剂量依赖性，尤其是在50~300 mg/L浓度范围内，GO对活性污泥中有机物、氮、磷等营养物质的生物去除、细菌代谢活性、细菌活力均有显著影响。此外，GO的存在增加了出水浊度，降低了污泥的脱水性能，从而使最终出水水质恶化。显微技术证实了GO在活性污泥絮体基质中的渗透和积累。结果表明，GO与废水的相互作用产生了大量的ROS，这可能是GO毒性作用的机制之一。(C)2013爱思唯尔B.V.保留所有权利。
The market for graphene-based products, such as graphene oxide (GO), is projected to reach nearly $675 million by 2020, hence it is expected that large quantities of graphene-based wastes will be generated by then. Wastewater treatment plants will be one of the ultimate repositories for these wastes. Efficient waste treatment relies heavily on the functions of diverse microbial communities. Therefore, systematic investigation of any potential toxic effects of GO in wastewater microbial communities is essential to determine the potential adverse effects and the fate of these nanomaterials in the environment. In the present study, we investigate the acute toxicity, i.e. short-term and high load, effect of GO on the microbial functions related to the biological wastewater treatment process. The results showed that toxic effects of GO on microbial communities were dose dependent, especially in concentrations between 50 and 300 mg/L. Bacterial metabolic activity, bacterial viability, and biological removal of nutrients, such as organics, nitrogen and phosphorus, were significantly impacted by the presence of GO in the activated sludge. Furthermore, the presence of GO deteriorated the final effluent quality by increasing the water turbidity and reducing the sludge dewaterability. Microscopic techniques confirmed penetration and accumulation of GO inside the activated sludge floc matrix. Results demonstrated that the interaction of GO with wastewater produced significant amount of reactive oxygen species (ROS), which could be one of the responsible mechanisms for the toxic effect of GO. (C) 2013 Elsevier B.V. All rights reserved.