The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform

B. H. Davison - One of the best experts on this subject based on the ideXlab platform.

  • microbial removal of alkanes from dilute Gaseous Waste streams mathematical modeling of advanced bioreactor systems
    Journal of Chemical Technology & Biotechnology, 1998
    Co-Authors: J. W. Barton, Sarah M Hartz, Thomas K Klasson, B. H. Davison
    Abstract:

    Many industries generate volatile organic compounds (VOCs) in dilute streams which must be removed before being released into the environment. Mathematical models for biological filters which can remediate Waste streams are useful both as predictive tools and as a means to better understand the fundamental processes involved. Optimization of the system also necessitates a better understanding of the mechanisms by which biofilters work and can be approached through modeling and maximizing appropriate conditions for removal. In a trickle-bed bioreactor, VOCs (n-pentane and isobutane) were passed over a biofilm-coated packing which degraded the VOCs. Bacterial growth was controlled via liquid nutrient-limited media trickled through the reactor. Results from this trickle-bed system were analyzed by applying a simple mathematical model to accurately describe the processes which are believed to play important roles. The model was based on a two-step process: mass transfer in which the VOCs diffuse into the liquid biofilm, and kinetics by which VOCs are degraded by the biofilm. Modeling results revealed that both kinetic and mass transfer resistances were significant under typical operating conditions.

  • Microbial removal of alkanes from dilute Gaseous Waste streams: Kinetics and mass transfer considerations
    Biotechnology Progress, 1997
    Co-Authors: J. W. Barton, Jr Koran L.j., K. Thomas Klasson, B. H. Davison
    Abstract:

    Treatment of dilute Gaseous hydrocarbon Waste streams remains a current need for many industries, particularly as increasingly stringent environmental regulations and oversight force emission reduction. Biofiltration systems hold promise for providing low-cost alternatives to more traditional, energy-intensive treatment methods such as incineration and adsorption. Elucidation of engineering principles governing the behavior of such systems, including mass transfer limitations, will broaden their applicability. Our processes exploit a microbial consortium to treat a mixture of 0.5% n-pentane and 0.5% isobutane in air. Since hydrocarbon gases are sparingly soluble in water, good mixing and high surface area between the gas and liquid phases are essential for biodegradation to be effective. One liquid-continuous columnar bioreactor was operated for more than 30 months with continued degradation of n-pentane and isobutane as sole carbon and energy sources. The maximum degradation rate observed in this gas-recycle system was 2 g of volatile organic compounds (VOC)/(m3.h). A trickle-bed bioreactor was operated continuously for over 24 months to provide a higher surface area (using a structured packing) with increased rates. Degradation rates consistently achieved were approximately 50 g of VOC/(m3.h) via single pass in this gas-continuous columnar system. Effective mass transfer coefficients comparable to literature values were also measured for this reactor; these values were substantially higher than those found in the gas-recycle reactor. Control of biomass levels was implemented by limiting the level of available nitrogen in the recirculating aqueous media, enabling long-term stability of reactor performance.

C.b. Scott - One of the best experts on this subject based on the ideXlab platform.

  • Liquid and Gaseous Waste Operations Project Annual Operating Report CY 1999
    2000
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    A total of 5.77 x 10 7 gallons (gal) of liquid Waste was decontaminated by the Process Waste Treatment Complex (PWTC) - Building 3544 ion exchange system during calendar year (CY) 1999. This averaged to 110 gpm throughout the year. An additional 3.94 x 10 6 gal of liquid Waste (average of 8 gpm throughout the year) was decontaminated using the zeolite treatment system due to periods of high Cesium levels in the influent Wastewater. A total of 6.17 x 10 7 gal of liquid Waste (average of 118 gpm throughout the year) was decontaminated at Building 3544 during the year. During the year, the regeneration of the ion exchange resins resulted in the generation of 8.00 x 10 3 gal of Liquid Low-Level Waste (LLLW) concentrate and 9.00 x 10 2 gal of LLLW supernate. See Table 1 for a monthly summary of activities at Building 3544. Figure 1 shows a diagram of the Process Waste Collection and Transfer System and Figure 2 shows a diagram of the Building 3544 treatment process. Figures 3, 4 5, and 6 s how a comparison of operations at Building 3544 in 1997 with previous years. Figure 7 shows a comparison of annual rainfall at Oak Ridge National Laboratory (ORNL) since 1995

  • Liquid and Gaseous Waste Operations Section Annual Operating Report CY 1998
    1999
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    No abstract prepared

  • Liquid and Gaseous Waste operations section. Annual operating report CY 1997
    1998
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    This document presents information on the liquid and Gaseous Wastes operations section for calendar year 1997. Operating activities, upgrade activities, and maintenance activities are described.

  • Liquid and Gaseous Waste Operations Department annual operating report CY 1996
    1997
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    This annual report summarizes operating activities dealing with the process Waste system, the liquid low-level Waste system, and the Gaseous Waste system. It also describes upgrade activities dealing with the process and liquid low-level Waste systems, the cathodic protection system, a stack ventilation system, and configuration control. Maintenance activities are described dealing with nonradiological Wastewater treatment plant, process Waste treatment plant and collection system, liquid low-level Waste system, and Gaseous Waste system. Miscellaneous activities include training, audits/reviews/tours, and environmental restoration support

  • Liquid and Gaseous Waste Operations Department annual operating report CY 1994
    1995
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    This report presents details about the operation of the liquid and Gaseous Waste department of Oak Ridge National Laboratory for the calendar year 1994. Topics discussed include; process Waste system, upgrade activities, low-level liquid radioactive Waste solidification project, maintenance activities, and other activities such as training, audits, and tours

J.j. Maddox - One of the best experts on this subject based on the ideXlab platform.

  • Liquid and Gaseous Waste Operations Project Annual Operating Report CY 1999
    2000
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    A total of 5.77 x 10 7 gallons (gal) of liquid Waste was decontaminated by the Process Waste Treatment Complex (PWTC) - Building 3544 ion exchange system during calendar year (CY) 1999. This averaged to 110 gpm throughout the year. An additional 3.94 x 10 6 gal of liquid Waste (average of 8 gpm throughout the year) was decontaminated using the zeolite treatment system due to periods of high Cesium levels in the influent Wastewater. A total of 6.17 x 10 7 gal of liquid Waste (average of 118 gpm throughout the year) was decontaminated at Building 3544 during the year. During the year, the regeneration of the ion exchange resins resulted in the generation of 8.00 x 10 3 gal of Liquid Low-Level Waste (LLLW) concentrate and 9.00 x 10 2 gal of LLLW supernate. See Table 1 for a monthly summary of activities at Building 3544. Figure 1 shows a diagram of the Process Waste Collection and Transfer System and Figure 2 shows a diagram of the Building 3544 treatment process. Figures 3, 4 5, and 6 s how a comparison of operations at Building 3544 in 1997 with previous years. Figure 7 shows a comparison of annual rainfall at Oak Ridge National Laboratory (ORNL) since 1995

  • Liquid and Gaseous Waste Operations Annual Operating Report CY 1999
    CrossRef Listing of Deleted DOIs, 2000
    Co-Authors: J.j. Maddox
    Abstract:

    No abstract prepared

  • Liquid and Gaseous Waste Operations Section Annual Operating Report CY 1998
    1999
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    No abstract prepared

  • Liquid and Gaseous Waste operations section. Annual operating report CY 1997
    1998
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    This document presents information on the liquid and Gaseous Wastes operations section for calendar year 1997. Operating activities, upgrade activities, and maintenance activities are described.

  • Liquid and Gaseous Waste Operations Department annual operating report CY 1996
    1997
    Co-Authors: J.j. Maddox, C.b. Scott
    Abstract:

    This annual report summarizes operating activities dealing with the process Waste system, the liquid low-level Waste system, and the Gaseous Waste system. It also describes upgrade activities dealing with the process and liquid low-level Waste systems, the cathodic protection system, a stack ventilation system, and configuration control. Maintenance activities are described dealing with nonradiological Wastewater treatment plant, process Waste treatment plant and collection system, liquid low-level Waste system, and Gaseous Waste system. Miscellaneous activities include training, audits/reviews/tours, and environmental restoration support

J. W. Barton - One of the best experts on this subject based on the ideXlab platform.

  • microbial removal of alkanes from dilute Gaseous Waste streams mathematical modeling of advanced bioreactor systems
    Journal of Chemical Technology & Biotechnology, 1998
    Co-Authors: J. W. Barton, Sarah M Hartz, Thomas K Klasson, B. H. Davison
    Abstract:

    Many industries generate volatile organic compounds (VOCs) in dilute streams which must be removed before being released into the environment. Mathematical models for biological filters which can remediate Waste streams are useful both as predictive tools and as a means to better understand the fundamental processes involved. Optimization of the system also necessitates a better understanding of the mechanisms by which biofilters work and can be approached through modeling and maximizing appropriate conditions for removal. In a trickle-bed bioreactor, VOCs (n-pentane and isobutane) were passed over a biofilm-coated packing which degraded the VOCs. Bacterial growth was controlled via liquid nutrient-limited media trickled through the reactor. Results from this trickle-bed system were analyzed by applying a simple mathematical model to accurately describe the processes which are believed to play important roles. The model was based on a two-step process: mass transfer in which the VOCs diffuse into the liquid biofilm, and kinetics by which VOCs are degraded by the biofilm. Modeling results revealed that both kinetic and mass transfer resistances were significant under typical operating conditions.

  • Microbial removal of alkanes from dilute Gaseous Waste streams: Kinetics and mass transfer considerations
    Biotechnology Progress, 1997
    Co-Authors: J. W. Barton, Jr Koran L.j., K. Thomas Klasson, B. H. Davison
    Abstract:

    Treatment of dilute Gaseous hydrocarbon Waste streams remains a current need for many industries, particularly as increasingly stringent environmental regulations and oversight force emission reduction. Biofiltration systems hold promise for providing low-cost alternatives to more traditional, energy-intensive treatment methods such as incineration and adsorption. Elucidation of engineering principles governing the behavior of such systems, including mass transfer limitations, will broaden their applicability. Our processes exploit a microbial consortium to treat a mixture of 0.5% n-pentane and 0.5% isobutane in air. Since hydrocarbon gases are sparingly soluble in water, good mixing and high surface area between the gas and liquid phases are essential for biodegradation to be effective. One liquid-continuous columnar bioreactor was operated for more than 30 months with continued degradation of n-pentane and isobutane as sole carbon and energy sources. The maximum degradation rate observed in this gas-recycle system was 2 g of volatile organic compounds (VOC)/(m3.h). A trickle-bed bioreactor was operated continuously for over 24 months to provide a higher surface area (using a structured packing) with increased rates. Degradation rates consistently achieved were approximately 50 g of VOC/(m3.h) via single pass in this gas-continuous columnar system. Effective mass transfer coefficients comparable to literature values were also measured for this reactor; these values were substantially higher than those found in the gas-recycle reactor. Control of biomass levels was implemented by limiting the level of available nitrogen in the recirculating aqueous media, enabling long-term stability of reactor performance.

D.l. Laughlin - One of the best experts on this subject based on the ideXlab platform.

  • Oak Ridge Research reactor shutdown maintenance and surveillance
    1991
    Co-Authors: G.h. Coleman, D.l. Laughlin
    Abstract:

    The Department of Energy ordered the Oak Ridge Research Reactor to be placed in permanent shutdown on July 14, 1987. The paper outlines routine maintenance activities and surveillance tests performed April through September, 1990, on the reactor instrumentation and controls, process system, and the Gaseous Waste filter system. Preparations are being made to transfer the facility to the Remedial Action Program. 6 tabs. (MHB)