Chapter 68 : Biogeochemistry of Aquifer Systems

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Many studies have examined the differences in bacterial numbers, composition, and activity between groundwater and sediment samples. The majority of the literature has suggested higher percentages of attached bacteria than of unattached bacteria in aquifer systems, including in pristine aquifers and in aquifers contaminated with petroleum, creosote, sewage, and landfill leachate. In studies of aquifer biogeochemistry, much useful information regarding the microbial ecology of the system can be obtained by looking at organic compound and electron acceptor concentrations. An overview of approaches for identifying the redox characteristics of sediment is given in Christensen et al., and methods specific for determining reactive iron species in aquifers are reviewed by Heron et al. and Tuccillo et al. Other solid-phase electron acceptors that are important in aquifer systems include Mn(IV) oxides and barite. Important biogeochemical reactions catalyzed by indigenous microorganisms also are studied using a variety of experimental approaches including laboratory batch and column experiments as well as field-based in situ microcosms, tracer tests, and push-pull tests. The advantage of using a radiolabeled tracer in a study was that the reaction rates could be determined for the different steps in the denitrification pathway. Historically, researchers trained in geochemistry and hydrology created and tested hypotheses about aquifer biogeochemistry through laboratory assays and field-based geo-chemical measurements and experiments. Jeon et al. extended this research by using push-pull tests combined with stable-isotope probing to identify the specific members of the microbial community actively degrading naphthalene and rates of naphthalene degradation.

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68
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Image of FIGURE 1

Illustration of the flow of water carrying energy and matter through the subsurface domain. Circles show various types of interface systems. Arrows in circles indicate the direction and, by their size, the relative importance of the matter and energy flow. WT, water table; CF, capillary fringe; FR, flow rate. Modified from reference with the permission of Cambridge University Press and from reference .

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68
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Image of FIGURE 2

Illustration of evolution of redox zones in a plume from a point source of organic contamination. red., reduction/reduced; depl., depleted; ox., oxidation; wt, water table. The axis is in units of time (t), and the axis is the concentration of contaminant (c). Reprinted from the ( ) with permission from Elsevier.

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68
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Summary of geochemical approaches for assessing aquifer biogeochemistry

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68
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Use of specific geochemical measurements as indicators of in situ biogeochemical processes in aquifers

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68
Generic image for table

Summary of approaches for investigating microbial community structure and function in aquifers

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68
Generic image for table

Examples of comprehensive, integrative investigations of aquifer biogeochemistry

Citation: Cozzarelli I, Weiss J. 2007. Biogeochemistry of Aquifer Systems, p 843-859. In Hurst C, Crawford R, Garland J, Lipson D, Mills A, Stetzenbach L (ed), Manual of Environmental Microbiology, Third Edition. ASM Press, Washington, DC. doi: 10.1128/9781555815882.ch68

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