Semi-Passive In Situ Bioremediation
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).
KeywordsElectron Donor Groundwater Flow Injection Well Tracer Test Sodium Lactate
- Krug T, Cox EE, Bertrand DM, Harre B. 2007. Demonstration of Active and Semi-Passive Electron Donor Addition for In Situ Bioremediation of Perchlorate. Presented at the Partners in Environmental Technology Technical Symposium & Workshop, Washington, DC, USA, December 4–6, 2007, poster #119. Abstract available at http://www.serdp.org/Symposium/upload/F_posters_2007_Wednesday_ALL_NEW.pdf. Accessed May 5, 2008.