Biogeochemistry and isotope geochemistry of a landfill leachate plume.

The biogeochemical processes were identified which improved the leachate composition in the flow direction of a landfill leachate plume (Banisveld, The Netherlands). Groundwater observation wells were placed at specific locations after delineating the leachate plume using geophysical tests to map subsurface conductivity. Redox processes were determined using the distribution of solid and soluble redox species, hydrogen concentrations, concentration of dissolved gases (N(2), Ar, and CH(4)), and stable isotopes (delta15N-NO(3), delta34S-SO(4), delta13C-CH(4), delta2H-CH(4), and delta13C of dissolved organic and inorganic carbon (DOC and DIC, respectively)). The combined application of these techniques improved the redox interpretation considerably. Dissolved organic carbon (DOC) decreased downstream in association with increasing delta13C-DOC values confirming the occurrence of degradation. Degradation of DOC was coupled to iron reduction inside the plume, while denitrification could be an important redox process at the top fringe of the plume. Stable carbon and hydrogen isotope signatures of methane indicated that methane was formed inside the landfill and not in the plume. Total gas pressure exceeded hydrostatic pressure in the plume, and methane seems subject to degassing. Quantitative proof for DOC degradation under iron-reducing conditions could only be obtained if the geochemical processes cation exchange and precipitation of carbonate minerals (siderite and calcite) were considered and incorporated in an inverse geochemical model of the plume. Simulation of delta13C-DIC confirmed that precipitation of carbonate minerals happened.

[1]  P. Fritz,et al.  Use of isotope fractionation of sulfate-sulfur and sulfate-oxygen to assess bacterial desulfurication in a sandy aquifer , 1990 .

[2]  J. Chanton,et al.  The effects of heat and stannous chloride addition on the active distillation of acid volatile sulfide from pyrite-rich marine sediment samples , 1985 .

[3]  B. Jørgensen,et al.  Measurement of bacterial sulfate reduction in sediments: Evaluation of a single-step chromium reduction method , 1989 .

[4]  Hans-Jørgen Albrechtsen,et al.  Characterization of redox conditions in groundwater contaminant plumes , 2000 .

[5]  Thomas Højlund Christensen,et al.  Natural Attenuation: A Feasible Approach to Remediation of Ground Water Pollution at Landfills? , 2000 .

[6]  A. Amirbahman,et al.  Aqueous- and Solid-Phase Biogeochemistry of a Calcareous Aquifer System Downgradient from a Municipal Solid Waste Landfill (Winterthur, Switzerland) , 1998 .

[7]  T. H. Christensen,et al.  An anaerobic field injection experiment in a landfill leachate plume, Grindsted, Denmark: 2. Deduction of anaerobic (methanogenic, sulfate‐, and Fe (III)‐reducing) redox conditions , 1999 .

[8]  C. Martens,et al.  Thermodynamic control on hydrogen concentrations in anoxic sediments , 1998 .

[9]  Philippe Van Cappellen,et al.  Kinetic modeling of microbially-driven redox chemistry of subsurface environments : coupling transport, microbial metabolism and geochemistry , 1998 .

[10]  D. Postma,et al.  Nitrate Reduction in an Unconfined Sandy Aquifer: Water Chemistry, Reduction Processes, and Geochemical Modeling , 1991 .

[11]  Andjelko Soro,et al.  Determination of Hydraulic Conductivity of Porous Media from Grain-Size Composition , 1992 .

[12]  G. McCarty,et al.  Denitrification and degassing in groundwater estimated from dissolved dinitrogen and argon , 1998 .

[13]  David L. Parkhurst,et al.  An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH, version 2.0 , 1994 .

[14]  David C. Nobes,et al.  Delineation of a landfill leachate plume and flow channels in coastal sands near Christchurch, New Zealand, using a shallow electromagnetic survey method , 2000 .

[15]  K. Hackley,et al.  Environmental Isotope Characteristics of Landfill Leachates and Gases , 1996 .

[16]  M. J. Baedecker,et al.  Hydrogeological Processes and Chemical Reactions at a Landfill. , 1979, Ground water.

[17]  P. McMahon,et al.  Geochemistry of dissolved inorganic carbon in a Coastal Plain aquifer. 1. Sulfate from confining beds as an oxidant in microbial CO2 production , 1991 .

[18]  Joan C. Woodward,et al.  Practical Considerations for Measuring Hydrogen Concentrations in Groundwater , 1997 .

[19]  D. Lovley,et al.  Hydrogen concentrations as an indicator of the predominant terminal electron-accepting reactions in aquatic sediments , 1988 .

[20]  R. Conrad,et al.  Influence of temperature on pathways to methane production in the permanently cold profundal sediment of Lake Constance , 1996 .

[21]  H. Hemond.  Acid Neutralizing Capacity, Alkalinity, and Acid-Base Status of Natural Waters Containing Organic Acids , 1990 .

[22]  A. Kehew,et al.  pH and Redox Buffering Mechanisms in a Glacial Drift Aquifer Contaminated by Landfill Leachate , 1990 .

[23]  W. Röling,et al.  Linking microbial community structure to pollution: biolog-substrate utilization in and near a landfill leachate plume. , 2000 .

[24]  David C. Jones,et al.  Characterization of an Unregulated Landfill Using Surface‐Based Geophysics and Geostatistics , 1998 .

[25]  A. Page.  Methods of soil analysis. Part 2. Chemical and microbiological properties. , 1982 .

[26]  J. F. Devlin.  Field Evidence for the Effect of Acetate on Leachate Alkalinity , 1990 .

[27]  E. Hornibrook,et al.  Evolution of stable carbon isotope compositions for methane and carbon dioxide in freshwater wetlands and other anaerobic environments , 2000 .

[28]  Poul Løgstrup Bjerg,et al.  Geology and sediment geochemistry of a landfill leachate contaminated aquifer (Grindsted, Denmark) , 1998 .

[29]  G. Heron,et al.  Biogeochemistry of landfill leachate plumes , 2001 .

[30]  A. Bourg,et al.  Speciation of Fe(II) and Fe(III) in Contaminated Aquifer Sediments Using Chemical Extraction Techniques. , 1994, Environmental science & technology.

[31]  R. V. Nicholson,et al.  Migration of contaminants in groundwater at a landfill: A case study 6. Hydrogeochemistry , 1983 .

[32]  P. Bergamaschi.  Seasonal variations of stable hydrogen and carbon isotope ratios in methane from a Chinese rice paddy , 1997 .

[33]  W. Röling,et al.  Relationships between Microbial Community Structure and Hydrochemistry in a Landfill Leachate-Polluted Aquifer , 2001, Applied and Environmental Microbiology.

[34]  Barbara A. Bekins,et al.  Simulation of aerobic and anaerobic biodegradation processes at a crude oil spill site , 1995 .

[35]  T. H. Christensen,et al.  H2 Concentrations in a Landfill Leachate Plume (Grindsted, Denmark): In Situ Energetics of Terminal Electron Acceptor Processes , 1998 .

[36]  M. J. Baedecker,et al.  Methane production and consumption monitored by stable H and C isotope ratios at a crude oil spill site, Bemidji, Minnesota , 1995 .

[37]  J. Fountain,et al.  Effect of Natural Gas Exsolution on Specific Storage in a Confined Aquifer Undergoing Water Level Decline , 2001, Ground water.

[38]  Robert T. Anderson,et al.  Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface , 2000 .

[39]  D. L. Parkhurst,et al.  User's guide to PHREEQC (Version 2)-a computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations , 1999 .

[40]  J. Griffioen.  Comment on ‘Kinetic modelling of microbially-driven redox chemistry of subsurface environments: Coupling transport, microbial metabolism and geochemistry’ by K.S. Hunter, Y. Wang and P. van Cappellen☆ , 1999 .

[41]  T. H. Christensen,et al.  Effects of sampling well construction on H2 measurements made for characterization of redox conditions in a contaminated aquifer , 1997 .

[42]  G. Heron,et al.  Oxidation capacity of aquifer sediments. , 1994, Environmental science & technology.

[43]  G. Faure.  Principles of isotope geology , 1977 .

[44]  Thomas Højlund Christensen,et al.  Redox zones of a landfill leachate pollution plume (Vejen, Denmark) , 1992 .

[45]  Tori M. Hoehler,et al.  Field and laboratory studies of methane oxidation in an anoxic marine sediment: Evidence for a methanogen‐sulfate reducer consortium , 1994 .

[46]  Thomas Højlund Christensen,et al.  CHARACTERIZATION OF THE DISSOLVED ORGANIC CARBON IN LANDFILL LEACHATE-POLLUTED GROUNDWATER , 1998 .

[47]  C. Appelo,et al.  Geochemical calculations and observations on salt water intrusions. II, Validation of a geochemical model with laboratory experiments , 1990 .

[48]  T H Christensen,et al.  Distribution of redox-sensitive groundwater quality parameters downgradient of a landfill (Grindsted, Denmark). , 1995, Environmental science & technology.

[49]  T. H. Christensen,et al.  The solubility of rhodochrosite (MnCO3) and siderite (FeCO3) in anaerobic aquatic environments , 2002 .

[50]  Peter G. Cook,et al.  Environmental Tracers in Subsurface Hydrology , 2000 .

[51]  B. Mayer,et al.  Sulphur and Oxygen Isotopes in Sulphate , 2000 .

[52]  Donald I. Siegel,et al.  Crude oil in a shallow sand and gravel aquifer-III , 1993 .

[53]  Jef Vandenberghe,et al.  Comparison of laser grain size analysis with pipette and sieve analysis: a solution for the underestimation of the clay fraction , 1997 .