Silver Sulfidation in Thermophilic Anaerobic Digesters and Effects on Antibiotic Resistance Genes

被引:9
|
作者
Kim, Bojeong [1 ,2 ,3 ]
Miller, Jennifer H. [4 ]
Monsegue, Niven [5 ]
Levard, Clement [6 ,7 ]
Hong, Yanjuan [4 ]
Hull, Matthew S. [2 ,4 ]
Murayama, Mitsuhiro [5 ,8 ]
Brown, Gordon E., Jr. [6 ,9 ,10 ]
Vikesland, Peter J. [2 ,4 ]
Knocke, William R. [4 ]
Pruden, Amy [4 ]
Hochella, Michael F., Jr. [1 ,2 ]
机构
[1] Virginia Tech, Dept Geosci, Blacksburg, VA USA
[2] Virginia Tech, Inst Crit Technol & Appl Sci, Environm Nanosci & Technol Lab, Blacksburg, VA USA
[3] Temple Univ, Dept Earth & Environm Sci, Coll Sci & Technol, 1901 N 13th St,Beury Hall,Rm 325C, Philadelphia, PA 19122 USA
[4] Virginia Tech, Charles E Via Jr Dept Civil & Environm Engn, Blacksburg, VA USA
[5] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA USA
[6] Stanford Univ, Dept Geol & Environm Sci, Surface & Aqueous Geochem Grp, Stanford, CA 94305 USA
[7] Aix Marseille Univ, CNRS, IRD, CEREGE UM34, Aix En Provence, France
[8] Virginia Tech, Inst Crit Technol & Appl Sci, Nanoscale Characterizat & Fabricat Lab, Blacksburg, VA USA
[9] SLAC Natl Accelerator Lab, Dept Photon Sci, Menlo Pk, CA USA
[10] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA USA
基金
美国国家科学基金会;
关键词
antibiotic resistance genes; Class; 1; integrons; wastewater treatment; intI1; thermophilic anaerobic digestion; sulfidation; silver nanoparticle; X-RAY-ABSORPTION; TETRACYCLINE RESISTANCE; ZINC SPECIATION; NANOPARTICLES; WATER; DISSOLUTION; INTEGRONS; IMPACT; FATE;
D O I
10.1089/ees.2015.0226
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Physical and chemical transformations and biological responses of silver nanoparticles (AgNPs) in wastewater treatment systems are of particular interest because of the extensive existing and continually growing uses of AgNPs in consumer products. In this study, we investigated the transformation of AgNPs and AgNO3 during thermophilic anaerobic digestion and effects on selection or transfer of antibiotic resistance genes (ARGs). Ag2S-NPs, sulfidation products of both AgNPs and AgNO3, were recovered from raw and digested sludges and were analyzed by analytical transmission electron microscopy (TEM) and X-ray absorption spectroscopy (XAS). TEM and XAS revealed rapid (<= 20 min) Ag sulfidation for both Ag treatments. Once transformed, Ag2S-NPs (as individual NPs or an NP aggregate) persisted for the duration of the batch digestion. The digestion process produced Ag2S-NPs that were strongly associated with sludge organics and/or other inorganic precipitates. Ag treatments (up to 1,000 mg Ag/kg) did not have an impact on the performance of thermophilic anaerobic digesters or ARG response, as indicated by quantitative polymerase chain reaction measurements of sul1, tet(W), and tet(O) and also intI1, an indicator of horizontal gene transfer of ARGs. Thus, rapid Ag sulfidation and stabilization with organics effectively sequester Ag and prevent biological interactions with the digester microbial community that could induce horizontal gene transfer or adversely impact digester performance through antimicrobial activity. This finding suggests that sulfide-rich anaerobic environments, such as digesters, likely have a high buffer capacity to mitigate the biological effects of AgNPs.
引用
收藏
页码:1 / 10
页数:10
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