1. Contradictory effects of silver nanoparticles on activated sludge wastewater treatment
- Author
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Jizhong Zhou, Yang Liu, Zhiya Sheng, and Joy D. Van Nostrand
- Subjects
Microbial diversity ,Geochip ,Health, Toxicology and Mutagenesis ,Metal Nanoparticles ,Biomass ,02 engineering and technology ,Functional diversity ,010501 environmental sciences ,Waste Disposal, Fluid ,01 natural sciences ,Silver nanoparticle ,Bioreactors ,Engineering ,RNA, Ribosomal, 16S ,Nanotechnology ,Waste Management and Disposal ,Sewage ,Waste management ,Chemistry ,Waste Disposal ,Pyrosequencing ,Biodiversity ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,Pollution ,6. Clean water ,Wastewater ,Sewage treatment ,Water treatment ,Fluid ,Silver nanoparticles ,0210 nano-technology ,16S ,Silver ,Environmental Engineering ,Bioengineering ,Industrial waste ,Hormesis ,Bioreactor ,Environmental Chemistry ,Strategic ,0105 earth and related environmental sciences ,Ribosomal ,Bacteria ,technology, industry, and agriculture ,Defence & Security Studies ,Activated sludge ,Chemical Sciences ,RNA ,Environmental Sciences - Abstract
© 2017 Elsevier B.V. Increased amount of nano-silver will be released into domestic and industrial waste streams due to its extensive application. However, great controversy still exists on the effects of silver nanoparticle (Ag-NP) on biological wastewater treatment processes and a toxicology model has not been built yet. Four sequencing batch reactors with activated sludge has been run for over three months with different silver species at a concentration of 1 mg Ag/L in influent. Both freshly prepared Ag-NPs and aged Ag-NPs were tested with released silver ion as control. Results in this study showed that Ag-NPs, especially freshly prepared Ag-NPs, can help to maintain or even increase the diversity of microbial community in activated sludge and the biomass concentration even under long-term treatment. It indicates that the hormesis model need to be considered for the toxicology of Ag-NPs.
- Published
- 2018