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BioSVE

Detailed Description

BioSVE

BioSVE





Introduction

BioSVE incorporates soil vapor extraction (SVE), vacuum enhanced recovery (bioventing) and biodegradation into one easy-to-use screening model. Quite often, field situations require tools to evaluate different remediation schemes prior to implementation. While these screening tools usually require extensive site data (which can be very expensive or impossible to collect in the available time frame), BioSVE allows site evaluation with few sampling events, quickly. Vacuum Enhanced Recovery (bioslurping), coupled with biodegradation, is a popular emerging cleanup technology, and BioSVE takes advantage of this industry trend with useful tools for hydrocarbon contaminant sites. A typical hydrocarbon spill/leak may contain from 20 to more than 100 components, and BioSVE can model recovery and degradation of up to 250 components. BioSVE allows for modeling of contaminants partitioned among water, vapor, free hydrocarbon and solid phases. This gives the user power to develop remediation strategies for free product recovery, soil vacuum extraction, natural or engineered biodegradation, etc., with high confidence and lower costs to total remediation efforts.


BioSVE Features

  • Screening for soil vacuum extraction (SVE), biodegradation, and vacuum enhanced recovery (VER).
  • Soil vacuum extraction of up to 250 species from the hydrocarbon contaminated unsaturated zone. Based on the assumption of chemical equilibrium, species are partitioned among water, oil, gas, and solid phases. Total recovery vs. time, mass of species in various phases vs. time, the species total mass vs. time, and species well gas concentration vs. time can be plotted by BioSVE's resident graphing package.
  • Non-equilibrium phase partitioning effect is incorporated via a venting efficiency factor.
  • Simulation of oxygen-limited biodegradation based on the assumption of an instantaneous reaction between the hydrocarbon species and oxygen. Kinetics effects are handled using a bio-efficiency factor.
  • User-defined free product recovery rate as HIN * Mf ** HEX, where Mf is the mass of hydrocarbon in free product.
  • Investigation of the effects of gas pumping rates and temperature on cleanup time.
  • Typical physicochemical properties data files for weathered gasoline are provided. The user can quickly edit copies of the file to accurately represent composition of the spill at the site.
  • Less than one minute simulation time for most simulations on a 486 computer.

BioSVE Technical Information

Soil Vapor Extraction (SVE) has proved successful for cleanup of the unsaturated zones at numerous sites contaminated with volatile hydrocarbons. An incidental effect of flushing air through the soil is that the renewed levels of oxygen stimulate aerobic biodegradation in soils and the negative gas pressures assist in enhanced hydrocarbon recovery (Vacuum Enhanced Recovery) with minimal smearing of the free hydrocarbon plume.

BioSVE simulates soil vapor extraction based on the chemical equilibrium model of Johnson et al. (1990). A user defined empirical free product recovery function is used to mimic vacuum enhanced recovery. An instantaneous reaction between oxygen and organic species is assumed and an oxygen-limited approach is used to model biodegradation. BioSVE models recovery versus time of up to 250 components partitioned among water, vapor, free hydrocarbon and solid phases. Additional features of BioSVE are:

  • A user-friendly pre- and post-processor to allow easy entry of input data and convenient graphical representation of the results. Recovery of species in various phases versus time, and the species total mass and species gas phase concentrations versus time can be plotted by BioSVE's resident graphing package.
  • Nonequilibrium phase partitioning effect is incorporated via a venting efficiency factor.
  • Oxygen-limited biodegradation based on the assumption of an instantaneous reaction between the hydrocarbon species and oxygen can be simulated. Kinetics effects are handled using a bio-efficiency factor.
  • A user-defined free product recovery rate (R) at time t as: R = AMoD can be imposed to simulate recovery of free floating product along with bioventing of the unsaturated zone
  • A typical physicochemical properties data file for weathered gasoline is provided. The user can quickly edit copies of this file to accurately represent composition of the spill at the site.

Equations (pdf)

Requires the Adobe Acrobat Reader to view pdf file.


BioSVE Input Parameters

The following are the input parameters needed in BioSVE:

  • Air pumping rate
  • Total mass of the spill
  • Maximum simulation time
  • Time increment parameters
  • Soil air temperature
  • Venting efficiency, bio-efficiency
  • Volume of contaminated soil
  • Soil bulk density
  • Fraction of organic matter in the soil
  • Free product recovery parameters
  • Species properties including: molecular weight, vapor pressure, mass fraction, boiling point, aqueous solubility, and the octanol-water partition coefficient.

BioSVE Pre- and Post-processor

Picture

The "Species Data" page allows you to enter and edit the species names and associated parameters used in the current project.

BioSVE Requirements: Windows 95/98/2000/NT and 4 MB RAM


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