The Experts below are selected from a list of 2220 Experts worldwide ranked by ideXlab platform

Aydin Akgerman - One of the best experts on this subject based on the ideXlab platform.

  • Modeling of Soil Vapor Extraction (SVE) systems — Part I
    Waste Management, 2000
    Co-Authors: J F Campagnolo, Aydin Akgerman
    Abstract:

    A model is presented for the remediation of a vadose-zone Soil by Soil Vapor Extraction (SVE). The proposed model allows for flexibility in the characterization of the Soil as a combination of sorbents of different properties. The realism and accuracy of the simulated Extraction rate and vacuum predictions are demonstrated by comparison with field data while the species conservation aspects of the model are validated by column data from Soil materials of many different characteristics. One simulation is compared to data from a pilot SVE project where trichloroethylene (TCE) was the contaminant, and is shown to predict species concentration levels and cumulative removal to a good degree of accuracy.

  • modeling of Soil Vapor Extraction sve systems part i
    Waste Management, 1995
    Co-Authors: J F Campagnolo, Aydin Akgerman
    Abstract:

    A model is presented for the remediation of a vadose-zone Soil by Soil Vapor Extraction (SVE). The proposed model allows for flexibility in the characterization of the Soil as a combination of sorbents of different properties. The realism and accuracy of the simulated Extraction rate and vacuum predictions are demonstrated by comparison with field data while the species conservation aspects of the model are validated by column data from Soil materials of many different characteristics. One simulation is compared to data from a pilot SVE project where trichloroethylene (TCE) was the contaminant, and is shown to predict species concentration levels and cumulative removal to a good degree of accuracy.

Hongbin Zhan - One of the best experts on this subject based on the ideXlab platform.

  • can atmospheric pressure and water table fluctuations be neglected in Soil Vapor Extraction
    Advances in Water Resources, 2012
    Co-Authors: Hongbin Zhan
    Abstract:

    Abstract Solutions to Soil Vapor Extraction (SVE) are indispensable to characterize the unsaturated zone and to optimize SVE. Most of the existing solutions neglect the fluctuations of atmospheric pressure and water table. This study presents a new semi-analytical solution for SVE by considering the atmospheric pressure and water table fluctuations. Comparisons between the new and previous solutions indicate that the water table effect is negligible but the atmospheric pressure effect is non-negligible for the interpretation of gas pressure in a non-coastal site where the daily water table fluctuation is in centimeters scale; both the water table and atmospheric pressure fluctuations need to be considered in a coastal site where the daily water table fluctuation is in tens of centimeters scale. Tidal-induced downward moving water table increases the depth-averaged radius of influence, which is insensitive to atmospheric pressure fluctuation. Less vertical gas permeability leads to greater atmospheric pressure and water table effect.

J F Campagnolo - One of the best experts on this subject based on the ideXlab platform.

  • Modeling of Soil Vapor Extraction (SVE) systems — Part I
    Waste Management, 2000
    Co-Authors: J F Campagnolo, Aydin Akgerman
    Abstract:

    A model is presented for the remediation of a vadose-zone Soil by Soil Vapor Extraction (SVE). The proposed model allows for flexibility in the characterization of the Soil as a combination of sorbents of different properties. The realism and accuracy of the simulated Extraction rate and vacuum predictions are demonstrated by comparison with field data while the species conservation aspects of the model are validated by column data from Soil materials of many different characteristics. One simulation is compared to data from a pilot SVE project where trichloroethylene (TCE) was the contaminant, and is shown to predict species concentration levels and cumulative removal to a good degree of accuracy.

  • modeling of Soil Vapor Extraction sve systems part i
    Waste Management, 1995
    Co-Authors: J F Campagnolo, Aydin Akgerman
    Abstract:

    A model is presented for the remediation of a vadose-zone Soil by Soil Vapor Extraction (SVE). The proposed model allows for flexibility in the characterization of the Soil as a combination of sorbents of different properties. The realism and accuracy of the simulated Extraction rate and vacuum predictions are demonstrated by comparison with field data while the species conservation aspects of the model are validated by column data from Soil materials of many different characteristics. One simulation is compared to data from a pilot SVE project where trichloroethylene (TCE) was the contaminant, and is shown to predict species concentration levels and cumulative removal to a good degree of accuracy.

Marshall W Davert - One of the best experts on this subject based on the ideXlab platform.

  • Soil Vapor Extraction system design by combinatorial optimization
    Water Resources Research, 1996
    Co-Authors: Marshall W Davert
    Abstract:

    Soil Vapor Extraction is a cost-effective technique for the removal of volatile organic compounds (VOCs) immobilized in the unsaturated zone. The design of Soil Vapor Extraction system (SVES) requires determination of the number and locations of Extraction wells and corresponding Extraction rates. At present, few guidelines for design are available. Thus most designs are based on empirical assessments, simplified analytical approximations, or limited trial-and-error simulations. In this paper, three optimization-based design methodologies are introduced: (1) implicit enumeration, (2) systematic reduction, and (3) local search. These methodologies address the combinatorial nature of the design problem and properly evaluate the well interference effects in a multiwell system. Through a benchmark problem, a comparative evaluation of the three methodologies is made with regard to their solution accuracy, computational efficiency, optimality heuristic, and application limitations.

  • Optimization of the Design and Operation of Soil Vapor Extraction Systems
    1994
    Co-Authors: Marshall W Davert
    Abstract:

    Volatile organic compounds (VOC's) immobilized within the Soil unsaturated zone constitute a significant source of groundwater contamination. Soil Vapor Extraction systems (SVES's), which remove these compounds via the Vapor phase by inducing advective fluxes throughout the Soil matrix, have proven effective for remediating contaminated sites. Currently, the design and operation of these systems is highly dependent upon engineering judgement and experience. Thus, methodologies that aid engineers in the evaluation of competing designs and operational policies could prove useful. Our research has two principal components: development of a numerical model that simulates the operations of an SVES, and development of an optimization model which identifies the optimal design configuration and operational parameters -- in a least cost sense -- of an SVES under field conditions.

N Barkley - One of the best experts on this subject based on the ideXlab platform.

  • remediation of low permeability subsurface formations by fracturing enhancement of Soil Vapor Extraction
    Journal of Hazardous Materials, 1995
    Co-Authors: U Frank, N Barkley
    Abstract:

    Abstract This paper describes the Superfund Innovative Technology Evaluation (SITE) of pneumatic and hydraulic fracturing to augment and improve the Extraction of volatile contaminants from Soil. The fracturing procedures involve a physical pressurization process that creates fissures and channels in Soils to enhance fluid or Vapor flow in the subsurface. Fractures are placed at specific locations and depths inside the boreholes of wells to increase the effectiveness of in situ remedial technologies, especially Soil Vapor Extraction (SVE). The fracturing technology is primarily beneficial in tightly packed geologic formations having low permeabilities. Results from several demonstrations indicated orders of magnitude increases in subsurface Vapor flow and contaminated Vapor Extraction rates after Soil fracturing.