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  • 1
    Digitale Medien
    Digitale Medien
    Pulsing of multiple nutrients as a strategy to achieve large biologically active zones during in situ carbon tetrachloride remediation (1997)
    Springer
    Computational geosciences 1 (1997), S. 271-288 
    Details
    ISSN: 1573-1499
    Schlagwort(e): bioremediation ; numerical simulation ; carbon tetrachloride ; denitrification
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Informatik
    Notizen: Abstract When injecting nutrients during active bioremediation, various nutrient addition strategies can be employed in order to remediate the site at minimal expense. In particular, if more than one nutrient is required, a pulse addition strategy can be devised in which these nutrients are added as temporally separated pulses such that the biostimulated portion of the flow field can be maximized. In this manuscript, results of numerical simulations are reported which demonstrate this effect. Previously published kinetic expressions describing microbial growth and carbon tetrachloride degradation under denitrifying conditions are used in these simulations. The simulations indicate that volumetric treatment can be accomplished by injecting long duration nutrient pulses of different nutrients that are separated by a long period where only unamended water is injected. This strategy will cause the nutrient pulses to overlap at a considerable distance from the injection point, while maintaining concentrations that are high enough to ensure significantbiomass growth and contaminant destruction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1011573429996
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  • 2
    Digitale Medien
    Digitale Medien
    Estimation of mass transport parameters in a column packed with BioSep beads (1998)
    Springer
    Biotechnology techniques 12 (1998), S. 913-918 
    Details
    ISSN: 1573-6784
    Schlagwort(e): Packed Column ; Transport ; Bioremediation ; Immobilization Matrix
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract An approach to estimate the parameters needed to describe the performance of a column packed with BioSepTM beads is presented. These parameters, which characterize the transport of materials through the column, have been estimated from experimental residence time distribution (RTD) data using both porous and non-porous beads. A laboratory-scale column was used to obtain the experimental data using several ionic species. © Rapid Science Ltd. 1998
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008821730019
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  • 3
    Digitale Medien
    Digitale Medien
    Bacterial reduction of hexavalent chromium by Enterobacter cloacae strain HO1 grown on sucrose (1997)
    Springer
    Biotechnology letters 19 (1997), S. 691-694 
    Details
    ISSN: 1573-6776
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract Chromium(VI) was reduced by Enterobacter cloacae strain HO1 grown with sucrose as a carbon source and nitrate as the initial terminal electron acceptor. Under excess substrate conditions, the Cr(VI) concentration, initially at 5 and 10 mg/l, was reduced to less than 100 mg/l.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018355318821
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  • 4
    Digitale Medien
    Digitale Medien
    Kinetics of nitrate inhibition of carbon tetrachloride transformation by a denitrifying consortia (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 45 (1995), S. 279-284 
    Details
    ISSN: 0006-3592
    Schlagwort(e): carbon tetrachloride ; nitrate inhibition ; biodegradation ; kinetics ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The kinetics of nitrate inhibition of carbon tetrachloride (CT) transformation were examined using a denitrifying consortium. Comparison of data from fed-batch experiments to the model reported by Hooker et al. indicate that the inhibition constant ranges between 3.2 and 21 mg/L, with an average of 8.8 mg/L. This range is much lower than the previously reported value of 169 mg/L. Simulations using the corrected parameter accurately reflect this new data and the data reported by Hooker et al. In contrast, the earlier reported coefficient value does not reflect the data reported in this work. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260450314
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  • 5
    Digitale Medien
    Digitale Medien
    Development of a predictive description of an immobilized-cell, three-phase, fluidized-bed bioreactor (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 46 (1995), S. 139-146 
    Details
    ISSN: 0006-3592
    Schlagwort(e): fluidized-bed bioreactor ; concentration profile ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A fully predictive mathematical description of a three-phase, tapered, fluidized-bed bioreactor is developed. This mathematical model includes the effects of the tapered bed, variable dispersion coefficient, and variable solid holdup upon the concentration profiles developed in the bed. In addition, the effect of the concentration profile which is developed inside the biocatalyst bead is included by means of an effectiveness factor calculation. Using accepted correlations for the dispersion coefficient and for the liquid, gas, and solid holdup in the bed, the model is fully predictive. The model was found to adequately predict experimental obtained concentration profiles. Then, the model was used to examine the various phase holdups through the bed and the degree to which the dispersion coefficient varied through the bed. The effect of changes in these calculated variables upon the reaction rate is discussed. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260460207
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  • 6
    Digitale Medien
    Digitale Medien
    Effects of nitrate and acetate availability on chloroform production during carbon tetrachloride destruction (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 51 (1996), S. 551-557 
    Details
    ISSN: 0006-3592
    Schlagwort(e): denitrify ; carbon tetrachloride ; chloroform ; acetate ; nitrate ; bioremediation ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Fed batch experiments were performed to test the effects of electron donor and electron acceptor availability on the production of chloroform (CF) during carbon tetrachloride (CT) destruction by a denitrifying bacterial consortium. In one series of tests, acetate (electron donor) was present in excess while nitrate and nitrite (electron acceptor) were limiting. In the other series of tests, acetate was the limiting nutrient, and nitrate and nitrite were in excess. Under nitrate limiting conditions, 50% (±17%) of the CT transformed by the microorganisms was converted to CF. However, under acetate limiting conditions, only 4% (±4%) of the CT that was degraded appeared as CF. Previous research had suggested that denitrifying bacteria can degrade CT via two competing pathways. One of these pathways produces CF as the predominant end product. The second pathway produces CO2 as the primary end product. The results shown here suggest that the first pathway is dominant when nitrate and nitrite are depleted while the second pathway, which produces little CF, dominates when nitrate or nitrite are available.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Biodegradation of 1,1,1-trichloroethane by a carbon tetrachloride-degrading denitrifying consortium (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 59 (1998), S. 393-399 
    Details
    ISSN: 0006-3592
    Schlagwort(e): denitrification ; biodegradation ; kinetics ; 1,1,1-trichloroethane ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A denitrifying consortium capable of degrading carbon tetrachloride (CT) was shown to also degrade 1,1,1-trichloroethane (TCA). Fed-batch experiments demonstrated that the specific rate of TCA degradation by the consortium was comparable to the specific rate of CT degradation (approximately 0.01 L/gmol/min) and was independent of the limiting nutrient. Although previous work demonstrated that 4-50% of CT transformed by the consortium was converted to chloroform (CF), no reductive dechlorination products were detected during TCA degradation, regardless of the limiting nutrient. The lack of chlorinated TCA degradation products implies that the denitrifying consortium possesses an alternate pathway for the degradation of chlorinated solvents which does not involve reductive dechlorination. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 59:393-399, 1998.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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