Microcosm Studies

XDD has performed a wide variety of microcosm studies to evaluate bioremediation options and obtain design parameters. Microcosm studies range from evaluating the natural ability of site conditions to remediate compounds of concern to testing various biostimulation or bioaugmentation approaches for enhanced bioremediation. The goal of most bioremediation testing is to identify the factor or factors that are currently limiting the extent of biological degradation at a site, therefore optimizing the full-scale design process and application.

XDD’s treatability lab has experience performing:

  • Aerobic Augmentation:
    • Oxygen
    • Nutrients
    • Other amendments
    • Bioaugmentation
  • Anaerobic Augmentation:
    • Nutrients
    • Methane
    • Other amendments
    • Bioaugmentation

XDD has in-house analytical equipment for estimating degradation rates during testing to provide intermediate progress performances. These allow for adjustments to be made during the experiments to optimize performance.

As always, XDD also brings their considerable experience associated with the design and application of remedial technologies when designing, conducting, and analyzing data from microcosm studies.

Email XDD at lcrawford@xdd-llc.com with inquiries about our treatability testing services.  Additionally, a selection of our case studies can be found here.

Treatability Studies

XDD performs treatability testing and microcosm studies to evaluate the site specific feasibility and to develop field-scale design parameters for all common in situ remediation technologies:

  • In Situ Chemical Oxidation:
    • Catalyzed Hydrogen Peroxide
    • Activated Persulfate
    • Permanganate
  • In Situ Chemical Reduction:
    • Zero Valent Iron (ZVI)
    • Bi-Metallic Particles
    • Metal Sulfides
  • In Situ Bioremediation
    • Aerobic
    • Anaerobic
    • Biostimulation
    • Bioaugmentation
  • In Situ Metals Stabilization
    • pH adjustment
    • metals sorption
    • metals precipitation
    • metals co-precipitation

Specialty Services

XDD Environmental will customize our treatability services to meet you site-specific needs.  Our most recent approaches include:

  • Thermal enhanced soil vapor extraction
  • Thermally enhanced bioremediation

XDD uses a methodical approach for our site evaluations. These evaluations are often aided by our state of the art treatability laboratory, confirming that the optimal remediation design has been selected for each site.

 

 

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Reductive Dechlorination Cultures

Through the acquisition of Bioremediation Consultants, Inc (BCI) methods and equipment, XDD has acquired over 22 specific cultures. These cultures can be grown in site-specific groundwater and provided for bioaugmentation and include:

  • Chlorinated Ethane and Ethene reducing cultures.
    • Neutral to low pH (5.7)
    • Low to high chloride and sulfate concentrations
  • Chlorinated benzene reducing cultures.
  • BCI’s polychlorinated bi-phenyl (PCB) reducing culture.

In-House Analytical Capabilities

  • Natural attenuation parameters
  • Dissolved gases such as methane, ethene, and ethane by gas chromatography (GC)
  • Volatile chlorinated compounds by GC
  • Alcohols, glycols, and water soluble ethers by GC
  • Organic acids such as formate, lactate, and acetate by capillary ion electrophoresis and by ion chromatography
  • Molecular hydrogen by reduction gas analysis
  • Anions such as nitrate, nitrite, phosphate, chloride and sulfate