Abstract
Silver nanoparticles (AgNPs, nanosilver) are used as an excellent antimicrobial agent in many consumer products. These nanoparticles are often released during washing and eventually enter wastewater treatment plants. The objective of this study was to evaluate how silver nanoparticles would affect wastewater treatment systems for organic and nutrient removal. The results demonstrated that nitrifying bacteria are especiall susceptible to inhibition by silver nanoparticles. At a concentration of 0.4 mg/L total AG, a mixture of silver ions and AgNPs (50:50 mass ratio, average size 15-21 nm) inhibited nitrification by 11.5 percent. During a nanosilber shock loading event lasting for 12 hours, a peak concentration of 0.5 mg/L Ag in the activated sludge basin (more than 95% assocated with biomass) was detected, resulted in a prolonged period (>1 month) of nitrification inhibition reaching a maximum of 50%, as evidenced by accumulations of ammonia and nitrite in the wastewater effluetn. In batch anaerobic digestion studies, AgNPs at the concentration of 19 mg/L (19,000 ppb) started to reduce cumulative biogas production, although the inhibition could be due to the accompanied nitrate in the nanosilver suspension. Results from the aerobic and anaerobic treatment studies suggest that accumulation of silver in acivated sludge may have a detrimental effect on nitrification and nutrient removal, if the concentration reaches theshold levels. The suggested threshold concentration of total silver including nanosilver in wastewater influent is 0.1 mg/L.
Principal Investigator: Zhiqiang Hu, University of Missouri, Columbia, MO
Used and edited with Permission from: Water Environment Research Foundation, Alexandria, VA
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References
Adams LK, Lyon DY, Alvarez PJJ (2006) Comparative eco-toxicity of nanoscale TiO2, SiO2, and ZnO water suspensions. Water Res 40:3527–3532
Benn TM, Westerhoff P (2008) Nanoparticle silver released into water from commercially available sock fabrics. Environ Sci Technol 42:4133–4139
Choi OK, Hu ZQ (2008) Size dependent and reactive oxygen species related nanosilver toxicity to nitrifying bacteria. Environ Sci Technol 42:4583–4588
Choi OK, Deng K, Kim NJ, Ross L, Surampalli YR, Hu ZQ (2008) The inhibitory effects of silver nanoparticles, silver ions, and silver chloride colloids on microbial growth. Water Res 42:3066–3074
Choi OK, Clevenger TE, Deng BL, Ross L, Surampalli YR, Hu ZQ (2009) Role of sulfide and ligand strength in controlling nanosilver toxicity. Water Res 43:1879–1886
Hu Z (2010) Impact of silver nanoparticles on wastewater treatment. Water Environment Research Foundation
Hu Z, Chandran K, Grasso D, Smets BF (2004) Comparison of nitrification inhibition by metals in batch and continuous flow reactors. Water Res 38(18):3949–3959
Kim JS, Kuk E, Yu KN, Kim JH, Park SJ, Lee HJ, Kim SH, Park YK, Park YH, Hwang CY, Kim YK, Lee YS, Jeong DH, Cho MH (2007) Antimicrobial effects of silver nanoparticles. Nanomed-Nanotechnol Biol Med 3:95–101
Kloepfer JA, Mielke RE, Nadeau JL (2005) Uptake of CdSe and CdSe/ZnS quantum dots into bacteria via purine-dependent mechanisms. Appl Environ Microbiol 71:2548–2557
Levine AD, Tchobanoglous G, Asano T (1991) Size distributions of particulate contaminants in waste-water and their impact on treatability. Water Res 25:911–922
Lin WS, Huang YW, Zhou XD, Ma YF (2006) In vitro toxicity of silica nanoparticles in human lung cancer cells. Toxicol Appl Pharmacol 217:252–259
Metcalf E, Eddy HP (2013) Wastewater engineering treatment, disposal and reuse, 5th edn. McGraw-Hill, New York
Morones JR, Elechiguerra JL, Camacho A, Holt K, Kouri JB, Ramirez JT, Yacaman MJ (2005) The bactericidal effect of silver nanoparticles. Nanotechnology 16:2346–2353
Navarro E, Piccapietra F, Wagner B, Marconi F, Kaegi R, Odzak N, Sigg L, Behra R (2008) Toxicity of silver nanoparticles to Chlamydomonas reinhardtii. Environ Sci Technol 42:8959–8964
Nel A, Xia T, Madler L, Li N (2006) Toxic potential of materials at the nanolevel. Science 311:622–627
Shafer MM, Overdier JT, Armstong DE (1998) Removal, partitioning, and fate of silver and other metals in wastewater treatment plants and effluent-receiving streams. Environ Toxicol Chem 17:630–641
Siripong S, Rittmann BE (2007) Diversity study of nitrifying bacteria in full-scale municipal wastewater treatment plants. Water Res 41:1110–1120
Stumm W, Morgan JJ (1996) Aquatic chemistry: chemical equilibria and rates in natural waters, 3rd edn. Wiley, New York
Wang JM (2003) Interactions of silver with wastewater constituents. Water Res 37:4444–4452
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Brown, J. (2017). Impact of Silver Nanoparticles on Wastewater Treatment. In: Lofrano, G., Libralato, G., Brown, J. (eds) Nanotechnologies for Environmental Remediation. Springer, Cham. https://doi.org/10.1007/978-3-319-53162-5_9
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DOI: https://doi.org/10.1007/978-3-319-53162-5_9
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