A comparison of nanosilver and silver ion effects on bioreactor landfill operations and methanogenic population dynamics

Yang, Yu; Gajaraj, Shashikanth; Wall, Judy D.; Hu, Zhiqiang

doi:10.1016/j.watres.2013.03.040

Cited by 48 publications

(25 citation statements)

References 38 publications

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“…Similar result was reported by Miller et al (2012). Nevertheless, when sewage sludge was treated in the landfill bioreactors in the presence of Ag-NPs, the methanogenesis was adversely influenced (Yang et al, 2012b), and the toxicity of Ag-NPs was observed to be higher than its counterpart silver ion (Yang et al, 2013b(Yang et al, , 2013c. The reason for this inconsistent observation was due to the different oxygen concentrations.…”

Section: Impacts Of Nps On Wastewater Treatment and Sewage Sludge Digsupporting

confidence: 79%

“…Yang et al (2012a) found that the methanosaeta and methanomicrobiales were the dominant methanogens in sludge anaerobic digestion system and their diversity and abundance remained largely unchanged after moderate concentration of nano-Ag (40 mg Ag/L) exposure. In nano-Ag exposed landfill bioreactors with initial microaerobic environments, however, nano-Ag not only affected the competition between hydrogenotrophic methanogens and acetoclastic methanogens but also largely decreased the gene copy numbers of total methanogens (Yang et al, 2012b(Yang et al, , 2013b.…”

Section: Impacts Of Nps On Diversities Of Microbial Community and Abumentioning

confidence: 94%

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Critical review of the influences of nanoparticles on biological wastewater treatment and sludge digestion

Wang

Chen

2015

Critical Reviews in Biotechnology

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Nanoparticles (NPs), with at least one dimension less than 100 nm, are substantially employed in consumer and industrial products due to their specific physical and chemical properties. The wide uses of engineered NPs inevitably cause their release into the environment, especially wastewater treatment plants. Therefore, it is essential to systematically assess their potential impact on biological wastewater treatment and subsequent sewage sludge digestion. This review aims to provide such support. First, this paper reviews the recent advances on the analytical developments and nano-bio interface of NPs in wastewater and sewage sludge treatment. The effects of NPs on biological wastewater treatment and sewage sludge digestion and related mechanisms are discussed in detail. Finally, the key questions that need to be answered in the future are pointed out, which include on-line revelation of the changes of NPs in sewage and sludge environments, in situ assessment of the variations of microorganisms involved in these biological systems after they are exposed to NPs. Differentiation of the contribution of individual toxicity mechanisms to these systems, and the identification of under what conditions the nanoparticle-induced toxicity will be increased or decreased are also considered.

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Section: Impacts Of Nps On Wastewater Treatment and Sewage Sludge Digsupporting

confidence: 79%

Section: Impacts Of Nps On Diversities Of Microbial Community and Abumentioning

confidence: 94%

Critical review of the influences of nanoparticles on biological wastewater treatment and sludge digestion

Wang

Chen

2015

Critical Reviews in Biotechnology

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“…Despite these examples of silver nanoparticle transformation and non-intrusiveness, there have been occasions when silver nanoparticles significantly affected anaerobic sludge digestion. Silver nanoparticles (size 21 nm) at 10 mg kg -1 of TS reduced biogas production, inhibited methanogen activities, and caused volatile fatty acids (VFA) accumulation in labscale anaerobic landfill bioreactors (volume 9 L) treating municipal solid waste (Yang et al 2013a). Specifically, methane production dropped by 77% at the end of the operation (day 205).…”

Section: Impacts Of Silver Nanoparticles On Sludge Digestionmentioning

confidence: 99%

Governing factors affecting the impacts of silver nanoparticles on wastewater treatment

Zhang

et al. 2016

Science of The Total Environment

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Silver nanoparticles (nanosilver or AgNPs) enter municipal wastewater from various sources, raising concerns about their potential adverse effects on wastewater treatment processes. We argue that the biological effects of silver nanoparticles at environmentally realistic concentrations (μgL or lower) on the performance of a full-scale municipal water resource recovery facility (WRRF) are minimal. Reactor configuration is a critical factor that reduces or even mutes the toxicity of silver nanoparticles towards wastewater microbes in a full-scale WRRF. Municipal sewage collection networks transform silver nanoparticles into silver(I)-complexes/precipitates with low ecotoxicity, and preliminary/primary treatment processes in front of biological treatment utilities partially remove silver nanoparticles to sludge. Microbial functional redundancy and microbial adaptability to silver nanoparticles also greatly alleviate the adverse effects of silver nanoparticles on the performance of a full-scale WRRF. Silver nanoparticles in a lab-scale bioreactor without a sewage collection system and/or a preliminary/primary treatment process, in contrast to being in a full scale system, may deteriorate the reactor performance at relatively high concentrations (e.g., mgL levels or higher). However, in many cases, silver nanoparticles have minimal impacts on lab-scale bioreactors, such as sequencing batch bioreactors (SBRs), especially when at relatively low concentrations (e.g., less than 1mgL). The susceptibility of wastewater microbes to silver nanoparticles is species-specific. In general, silver nanoparticles have higher toxicity towards nitrifying bacteria than heterotrophic bacteria.

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“…While silver ions had no impact on the landfill production of methane at the concentration of 10 mg/kg solids, AgNPs at that concentration inhibited methanogenesis. This inhibition might be due to the slow and long-term silver ion release from the AgNPs dissolution in the landfill [27]. …”

Section: Nanowastes Treatment By Landfillmentioning

confidence: 99%

Nanowastes treatment in environmental media

Kim

2014

Environ Health Toxicol

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ObjectivesThis paper tried to review a recent research trend for the environmental exposure of engineered nanomaterials (ENMs) and its removal efficiency in the nanowaste treatment plants.MethodsThe studies on the predicted environmental concentrations (PEC) of ENMs obtained by exposure modeling and treatment (or removal) efficiency in nanowaste treatment facilities, such as wastewater treatment plant (WTP) and waste incineration plant (WIP) were investigated. The studies on the landfill of nanowastes also were investigated.ResultsThe Swiss Federal Laboratories for Materials Science and Technology group has led the way in developing methods for estimating ENM production and emissions. The PEC values are available for surface water, wastewater treatment plant effluents, biosolids, sediments, soils, and air. Based on the PEC modeling, the major routes for the environmental exposure of the ENMs were found as WTP effluents/sludge. The ENMs entered in the WTP were 90-99% removed and accumulated in the activated sludge and sludge cake. Additionally, the waste ash released from the WIP contain ENMs. Ultimately, landfills are the likely final destination of the disposed sludge or discarded ENMs products.ConclusionsAlthough the removal efficiency of the ENMs using nanowaste treatment facilities is acceptable, the ENMs were accumulated on the sludge and then finally moved to the landfill. Therefore, the monitoring for the ENMs in the environment where the WTP effluent is discharged or biomass disposed is required to increase our knowledge on the fate and transport of the ENMs and to prevent the unintentional exposure (release) in the environment.

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A comparison of nanosilver and silver ion effects on bioreactor landfill operations and methanogenic population dynamics

Cited by 48 publications

References 38 publications

Critical review of the influences of nanoparticles on biological wastewater treatment and sludge digestion

Critical review of the influences of nanoparticles on biological wastewater treatment and sludge digestion

Governing factors affecting the impacts of silver nanoparticles on wastewater treatment

Nanowastes treatment in environmental media

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