Influence of Silver nanoparticles on nutrient removal and microbial communities in SBR process after long-term exposure
文献类型： 外文期刊
作者： Zhang, Zhaohan 1 ; Gao, Peng 1 ; Li, Moqing 1 ; Cheng, Jiaqi 1 ; Liu, Wei 2 ; Feng, Yujie 1 ;
作者机构： 1.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, 73 Huanghe Rd, Harbin 150090, Peoples R China
2.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, 43 Songfa St, Harbin 150001, Peoples R China
关键词： Silver nanoparticles; Wastewater treatment; Nutrient removal; Inhibitory mechanisms; Microbial community structure
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）
ISSN： 0048-9697
年卷期： 2016 年 569 卷
页码：
收录情况： SCI
摘要： The widespread utilization of silver nanoparticles (AgNPs) in industrial and commercial products inevitably raises the release into wastewater that might cause potential negative impacts on sewage treatment system. In this paper, long-term exposure experiments at four levels were conducted to determine whether AgNPs caused adverse impacts on nutrient removals in sequencing batch reactors (SBRs) and changes of microbial community structure. Compared with the control reactor (without AgNPs), carbon, nitrogen and phosphorus removal in presence of 0.1 mg/L AgNPs was no difference. However, presence of 1.0 and 10 mg/L AgNPs decreased the average removal efficiencies of COD from 95.4% to 85.2% and 68.3%, ammonia nitrogen from 98.8% to 71.2% and 49%, SOP from 97.6% to 75.5% and 54.1%, respectively. It was found that AgNPs could accumulate in sludge with the distribution coefficients of 39.2-114 L/g, inhibit the protein and polysaccharide production in EPS, reduce the SOUR of sludge, and greatly increase LDH release from microbial cells. The illumina high-throughput sequencing results indicated that AgNPs concentration changed the structures of bacterial communities, associating with the effects of AgNPs on reactor performance. Sequence analyses showed that Proteobacteria, Bacteroidetes and Acidobacteria were the dominant phyla. It was notable that AgNPs addition reduced the contents of several nitrifying bacteria at genera level in sludge, leading to the lower removal of nitrogen. (C) 2016 Elsevier B.V. All rights reserved.
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