期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 572, 期 -, 页码 852-873出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.07.145
关键词
Silver nanoparticles; Municipal wastewater; Biological treatment; Toxicity; Reactor configuration; Functional redundancy; Adaptability; Microbial community
资金
- U.S. National Science Foundation (NSF) [0966930]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0966930] Funding Source: National Science Foundation
Silver nanoparticles (nanosilver or AgNPs) enter municipal wastewater from various sources, raising concerns about their potential adverse effects on wastewater treatment processes. We argue that the biological effects of silver nanoparticles at environmentally realistic concentrations (mu g L-1 or lower) on the performance of a full--scale municipal water resource recovery facility(WRRF) are minimal. Reactor configuration is a critical factor that reduces or even mutes the toxicity of silver nanoparticles towards wastewater microbes in a full-scale WRRF. Municipal sewage collection networks transform silver nanoparticles into silver(I)-complexes/precipitates with low ecotoxicity, and preliminary/primary treatment processes in front of biological treatment utilities partially remove silver nanoparticles to sludge. Microbial functional redundancy and microbial adaptability to silver nanoparticles also greatly alleviate the adverse effects of silver nanoparticles on the performance of a full-scale WRRF. Silver nanoparticles in a lab-scale bioreactor without a sewage collection system and/or a preliminary/primary treatment process, in contrast to being in a full scale system, may deteriorate the reactor performance at relatively high concentrations (e.g., mg L-1 levels or higher). However, in many cases, silver nanoparticles have minimal impacts on lab-scale bioreactors, such as sequencing batch bioreactors (SBRs), especially when at relatively low concentrations (e.g., less than 1 mg L-1). The susceptibility of wastewater microbes to silver nanoparticles is species specific. In general, silver nanoparticles have higher toxicity towards nitrifying bacteria than heterotrophic bacteria. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据