Bacterial response to a shock load of nanosilver in an activated sludge treatment system

Liang, Zhihua; Das, Atreyee; Hu, Zhiqiang

doi:10.1016/j.watres.2010.06.060

Cited by 179 publications

(96 citation statements)

References 23 publications

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“…1], in a wide range of consumer and commercial goods, 2 and as a bactericidal agent in the treatment of wastewater. 3 To meet the demand for said applications, between 2.8 and 20 tons of engineered AgNPs are produced annually in the United States alone, 4 with approximately 500 tons produced globally per annum (this estimate is an extrapolation). 5 The physicochemical properties of these engineered AgNPs influence their antibacterial activity, including size, 6 shape, 7 and surface coating.…”

Section: Introductionmentioning

confidence: 99%

A systematic review of evidence for silver nanoparticle-induced mitochondrial toxicity

Maurer

Meyer

2016

Environ. Sci.: Nano

106

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Section: Introductionmentioning

confidence: 99%

A systematic review of evidence for silver nanoparticle-induced mitochondrial toxicity

Maurer

Meyer

2016

Environ. Sci.: Nano

106

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“…However, concerns have recently arisen as to whether Ag NPs pose hazards distinct from ionic silver with respect to wastewater microorganisms, toxicity, and fate (Choi and Hu, 2009;Liang et al, 2010). Kiser et al (2010) reported 97% removal of Ag NPs by sorption to activated sludge biomass; thus, Ag NPs will likely accumulate from influent wastewater in sludge sent to digestion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silver Nanoparticles and Antibiotics on Antibiotic Resistance Genes in Anaerobic Digestion

Miller

Novak

Knocke

et al. 2013

Water Environment Research

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Water resource recovery facilities have been described as creating breeding ground conditions for the selection, transfer, and dissemination of antibiotic resistance genes (ARGs) among various bacteria. The objective of this study was to determine the effect of direct addition of antibiotic and silver nanoparticles (Ag NPs, or nanosilver) on the occurrence of ARGs in thermophilic anaerobic digesters. Test thermophilic digesters were amended with environmentally-relevant concentrations of Ag NP (0.01, 0.1, and 1.0 mg-Ag/L; corresponding to '0.7, 7.0, and 70 mg-Ag/kg total solids) and sulfamethoxazole (SMX) that span susceptible to resistant classifications (1, 5, and 50 mg/L) as potential selection pressures for ARGs. Tetracycline (tet(O), tet(W)) and sulfonamide (sulI, sulII) ARGs and the integrase enzyme gene (intI1) associated with Class 1 integrons were measured in raw sludge, test thermophilic digesters, a control thermophilic digester, and a control mesophilic digester. There was no apparent effect of Ag NPs on thermophilic anaerobic digester performance. The maximum SMX addition (50 mg/L) resulted in accumulation of volatile fatty acids and low pH, alkalinity, and volatile solids reduction. There was no significant difference between ARG gene copy numbers (absolute or normalized to 16S rRNA genes) in amended thermophilic digesters and the control thermophilic digester.

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“…Others have supported this finding, and found that the amount of chemisorbed Ag However, there is growing concern surrounding the increasing use of AgNP and their impact of the environment. The spread of AgNP into wastewater is an environmental concern, in that researchers have found that the numbers of nitrifying bacteria found in sludge are reduced when exposed to large quantities of AgNP, 7 which has severe implications on waste water treatment.…”

Section: Introductionmentioning

confidence: 99%

Silver nanoparticles embedded in zeolite membranes: release of silver ions and mechanism of antibacterial action

Nagy

Harrison²,

Sabbani³

et al. 2011

IJN

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Background The focus of this study is on the antibacterial properties of silver nanoparticles embedded within a zeolite membrane (AgNP-ZM). Methods and Results These membranes were effective in killing Escherichia coli and were bacteriostatic against methicillin-resistant Staphylococcus aureus. E. coli suspended in Luria Bertani (LB) broth and isolated from physical contact with the membrane were also killed. Elemental analysis indicated slow release of Ag + from the AgNP-ZM into the LB broth. The E. coli killing efficiency of AgNP-ZM was found to decrease with repeated use, and this was correlated with decreased release of silver ions with each use of the support. Gene expression microarrays revealed upregulation of several antioxidant genes as well as genes coding for metal transport, metal reduction, and ATPase pumps in response to silver ions released from AgNP-ZM. Gene expression of iron transporters was reduced, and increased expression of ferrochelatase was observed. In addition, upregulation of multiple antibiotic resistance genes was demonstrated. The expression levels of multicopper oxidase, glutaredoxin, and thioredoxin decreased with each support use, reflecting the lower amounts of Ag + released from the membrane. The antibacterial mechanism of AgNP-ZM is proposed to be related to the exhaustion of antioxidant capacity. Conclusion These results indicate that AgNP-ZM provide a novel matrix for gradual release of Ag + .

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Bacterial response to a shock load of nanosilver in an activated sludge treatment system

Cited by 179 publications

References 23 publications

A systematic review of evidence for silver nanoparticle-induced mitochondrial toxicity

A systematic review of evidence for silver nanoparticle-induced mitochondrial toxicity

Effect of Silver Nanoparticles and Antibiotics on Antibiotic Resistance Genes in Anaerobic Digestion

Silver nanoparticles embedded in zeolite membranes: release of silver ions and mechanism of antibacterial action

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