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Semi-Passive In Situ Bioremediation

  • Thomas A. Krug
  • Evan E. Cox
Part of the SERDP/ESTCP Environmental Remediation Technology book series (SERDP/ESTCP)

7.1 Background

7.1.1 What is a Semi-Passive Approach

Semi-passive enhanced in situ bioremediation (EISB) of perchlorate involves the addition of electron donor on a periodic basis to stimulate natural microbiological populations. Semi-passive EISB approaches are similar to active approaches in that groundwater is recirculated between injection and extraction wells; however, with the semi-passive approach, groundwater is recirculated for an “active phase” of a limited duration (e.g., several days to several weeks) to distribute the electron donor, and then the recirculation system is shut off for a “passive phase” of longer duration (e.g., several weeks to several months).

Figure 7.1shows the induced and natural groundwater flow patterns during the active and passive phases of a semi-passive system. In this case, the injection and extraction wells are configured to create a biobarrier perpendicular to groundwater flow. Groundwater extracted from the central well is amended with...

Keywords

Electron Donor Groundwater Flow Injection Well Tracer Test Sodium Lactate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Thomas A. Krug
    • 1
  • Evan E. Cox
    • 1
  1. 1.Geosyntec Consultants, Inc.GuelphCanada

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