Microbial Impacts to the Near-Field Environment Geochemistry: a model for estimating microbial communities in repository drifts at Yucca Mountain

Jolley, Darren M.; Ehrhorn, Thomas F.; Horn, Joseph M.

doi:10.1016/s0169-7722(02)00187-0

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…In each case, microbial activities may play a role in the security of the materials deposited therein. The microbiology of nuclear waste storage locations has been investigated to determine the degree to which biological activity may alter the waste in a range of geological environments designated as candidate underground repositories (Stroes-Gascoyne and West 1997;Pedersen 1999;Pitonzo et al 1999;Jolley et al 2003;Horn et al 2004;Nazina et al 2004). Locations close to the waste canisters shortly after enclosure may create conditions that are outside the range of microbial survival due to high-temperature or high-radiation fields of the newly deposited waste.…”

Section: Where and When Does Life In The Subsurface Really Matter To Us?mentioning

confidence: 99%

Nature and Extent of the Deep Biosphere

Colwell

Dhondt

2013

Reviews in Mineralogy and Geochemistry

111

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cells were present in fluids produced from oil reservoirs even if their original provenance could not be ascertained. These land-based studies only preceded Claude ZoBell's first look into the seafloor by a few years. Even with short core lengths, ZoBell and Anderson discerned a trend towards increasing numbers of anaerobes relative to aerobes as the samples came from deeper and deeper in the top two meters of sediment (Zobell and Anderson 1936). Of course, much detail has been laid atop these early observations but this glimpse of the effect of plummeting redox still holds as a principle of subsurface studies.

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Section: Where and When Does Life In The Subsurface Really Matter To Us?mentioning

confidence: 99%

Nature and Extent of the Deep Biosphere

Colwell

Dhondt

2013

Reviews in Mineralogy and Geochemistry

111

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“…This style of model was first proposed by Grogan and McKinley (1990) and similar models were used by Baker et al (1998) and Jolley et al (2003) There are numerous models of 'coupled microbe growth and mass transport' reported in the literature over the past 30 or more years. A review of these models by Baveye and Valocchi (1989) divided them into three groups according to the treatment of the attached bacteria.…”

Section: Modelling Of Biofilmsmentioning

confidence: 99%

The role of biofilms in subsurface transport processes

Coombs

Wagner

Bateman

et al. 2010

QJEGH

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Landfill and radioactive waste disposal risk assessments focus on contaminant transport and are principally concerned with understanding the movement of gas, water and solutes through engineered barriers and natural groundwater systems. However, microbiological activity can impact on transport processes changing the chemical and physical characteristics of the subsurface environment. Such effects are generally caused by biofilms attached to rock surfaces. This paper will present the results of an experimental study of the significance of biofilm growth on groundwater flow and the transport of contaminants in intergranular and fracture porosity flow systems.Risk assessments for landfills and geological repositories for radioactive waste are primarily based on the precepts of contaminant transport; and are concerned with understanding the movement of gas, water and solutes through engineered barriers and natural groundwater systems, within the concept of 'Source', 'Pathway' and 'Receptor'. The emphasis on solute migration for landfill investigations is reflected in the theoretical development used during numerical simulation. However, microbes living in such environments can have an impact on transport processes (Chapelle 2000;Cunningham et al. 1997; Fredrickson et al. 1989; Keith-Loach & Livens 2002;West & Chilton 1997;West et al. 2006). Microbial activity in any environment is generally located on chemical or physical interfaces, usually within biofilms, and the impacts can be both physical (e.g. altering porosity) and/or chemical (e.g. changing pH, redox conditions) and may result in intracellular or extracellular mineral formation or degradation (Beveridge et al. 1997;Ehrlich 1999;Konhauser et al. 1998;Milodowski et al. 1990;Tuck et al. 2006). Where biofilm growth in a crystalline host rock promotes mineral precipitation it can reduce water inflow and this can be a positive effect for limiting the transport of contaminants. Recent experimental work has investigated some of these chemical and physical effects in more detail in the context of the geological containment of radioactive waste. This paper will examine some of these studies and will indicate the significance of biofilms in influencing both granular and fracture flow. 2 BiofilmsA biofilm is an agglomeration of microbial cells and their excreted organic and inorganic products that is attached to, or coats, mineral surfaces or other substrates (Taylor & Jaffe 1990a). Biofilms are very common in the geosphere and biosphere, forming in diverse environments including the surfaces of human teeth (Marsh 2004), wall murals and stone monuments (Dornieden et al. 2000), stream sediments (Konhauser et al. 1998), cave and mine walls (Plate 1) and the subsurface (Tuck 2006). In such natural systems, they often comprise a mixture of interacting microbial species forming complex ecosystems. Biofilm thickness is extremely variable ranging from a single cell monolayer, to thick mucous microcolonies of microbes held together by Extracellular Polymeric Substances...

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“…Nejvyšší teploty pro přežití bakterií jsou udávány 113°C [29], 115°C [25] či dokonce 120°C [30,31]. Pík povrchové teploty je v horizontu prvních 100 let [31], stejně jako pík minimální relativní vlhkosti (RH).…”

Section: Mikrobiální Koroze V Hlubinném úLožištiunclassified

Microbial corrosion of metallic materials in a deep nuclear-waste repository

Stoulil

Dobrev

2016

Koroze a Ochrana Materialu

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The study summarises current knowledge on microbial corrosion in a deep nuclear-waste repository. The first part evaluates the general impact of microbial activity on corrosion mechanisms. Especially, the impact of microbial metabolism on the environment and the impact of biofilms on the surface of structure materials were evaluated. The next part focuses on microbial corrosion in a deep nuclear-waste repository. The study aims to suggest the development of the repository environment and in that respect the viability of bacteria, depending on the probable conditions of the environment, such as humidity of bentonite, pressure in compact bentonite, the impact of ionizing radiation, etc. The last part is aimed at possible techniques for microbial corrosion mechanism monitoring in the conditions of a deep repository. Namely, electrochemical and microscopic techniques were discussed.

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Microbial Impacts to the Near-Field Environment Geochemistry: a model for estimating microbial communities in repository drifts at Yucca Mountain

Cited by 9 publications

References 15 publications

Nature and Extent of the Deep Biosphere

Nature and Extent of the Deep Biosphere

The role of biofilms in subsurface transport processes

Microbial corrosion of metallic materials in a deep nuclear-waste repository

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