In situ and laboratory determined first-order degradation rate constants of specific organic compounds in an aerobic aquifer

Article Abstract:

The first-order degradation rate constants of benzene, toluene, o-xylene, nitrobenzene, naphthalene, biphenyl, o- and p-dichlorobenzene, 1,1,1-trichloroethane, tetrachloromethane, trichloroethene, tetrachloroethene, phenol, o-cresol, 2,4- and 2,6-dichlorophenol, 4,6-o-dichlorocresol and o- and p-nitrophenol in an aerobic aquifer were determined using in situ and laboratory batch microcosms. First-order degradation rate constants for aromatic and phenolic hydrocarbons were within the 0.01 and 0.9 day range. No systematic differences were noted between rate constants determined in situ and in the laboratory.

Research, Biodegradation, Organic compounds, Aquifers

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H2 concentrations in a landfill leachate plume (Grindsted, Denmark): in situ energetics of terminal electron acceptor processes

Article Abstract:

The study represents the first H2 measurements from a mixed landfill leachate plume coming from the Grindsted Landfill, Denmark, using an alternative partial equilibrium approach. Concentrations of H2 and redox process reactants and products were measured in 52 sampling points, downgradient at the Grindsted Landfill and used to calculate in situ delta Gr values of the TEAPs (terminal electron-accepting processes) assuming partial equilibrium.H2 generally ranged from 0.004 to 0.88 nM, with most values around 0.2nM.

Comment:

Denmark: Study represents 1st H2 measurements from a mixed landfill leachate plume coming from the Grindsted Landfill

Denmark, Nonmanufacturing technology, Solid Waste Landfill, Article

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Distribution of redox-sensitive groundwater quality parameters downgradient of a landfill (Grindsted, Denmark)

Article Abstract:

A study was conducted to identify the parameters which influence redox-sensitive groundwater flow in a landfill leachate plume in Grindsted, Denmark. Analysis of trace metals present in the water indicated high methane production and reduction in iron, sulfate, manganese and nitrate in the plume. The landfill contained rich methanogenic and sulfate-reducing zones, while high aerobic activity was observed in areas far from the landfill. In between the two were areas called transition zones.

Environmental aspects, Hazardous waste sites, Fills (Earthwork)

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