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  • 1
    Electronic Resource
    Electronic Resource
    Experimental study and numerical simulation of denitrification in saturated porous media (1992)
    Springer
    Water, air & soil pollution 61 (1992), S. 75-93 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effect of denitrification on the behavior of nitrate in saturated sandy soil was studied in the laboratory and the results were compared with the temporal and spatial concentration of nitrate in nonreactive (without denitrification) and reactive (with denitrification) cases. A laboratory model was fabricated to study steady one-dimensional flow and to transport nitrate with or without denitrification. Denitrification at various rates has been simulated with varied C∶N ratios and detention time. Retardation constant, dispersivity, and degradation constants have been computed using existing analytical models supporting adsorption and zero and/or first order production or decay. It was found that such analytical models can be used to fit the concentration of nitrate in saturated porous media for a C∶N ratio between 2 and 5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00478367
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Groundwater Velocity on Pilot Scale Bioremediation of Gasoline Contaminated Sandy Aquifers (2000)
    Springer
    Water, air & soil pollution 120 (2000), S. 315-329 
    Details
    ISSN: 1573-2932
    Keywords: biodegradation kinetics ; bioremediation ; BTX ; factorsaffecting bioremediation ; groundwater velocity ; Monod kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effect of groundwater velocity onbioremediation of gasoline contaminated sandy soil hasbeen investigated using a pilot scale sand tank model.The effect of hydrogen peroxide and contaminantconcentration are also included. A factorialexperiment has been conducted to study three factors,groundwater velocity, inlet BTX concentration andhydrogen peroxide dose. Observed concentration datacollected from the sand tank model have been used forestimating the transport parameters. Three differentbiodegrdation kinetics, namely first-order/zero-order,Monod and Michaelis Menten (a modification of Monodkinetics considering no microbial growth) kineticshave been used to model the biodegration. The datahave been found to fit all three models withacceptable coefficient of regression. Groundwatervelocity has been found to be the most significantfactor governing the biodegradation rate constants(determined from the first-order rate constant) of BTXcompounds. Hydrogen peroxide dose and BTX concentration have also been found to be significant factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005203702132
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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