Accession Number : ADA621906


Title :   Enhanced Amendment Delivery to Low Permeability Zones for Chlorinated Solvent Source Area Bioremediation


Descriptive Note : Final rept. Feb 2009 Oct 2014


Corporate Author : GSI ENVIRONMENTAL INC HOUSTON TX


Personal Author(s) : Adamson, David ; Newell, Charles ; Truex, Michael ; Zhong, Lirong


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a621906.pdf


Report Date : Sep 2014


Pagination or Media Count : 202


Abstract : This project demonstrated the use of shear-thinning fluid based technology to improve treatment within low-permeability (low-k) zones of heterogeneous subsurface environments. These low-k zones can serve as a long-term secondary source of contamination because transport may be diffusion controlled, yet they are difficult to target using standard injection-based treatment approaches. A shear-thinning fluid can be used to distribute a bioremediation amendment (e.g., lactate) around an injection well such that the solution was able to better penetrate and deliver the amendments to both high and low-permeability zones. When injected at a relatively high velocity compared to natural groundwater flow velocities, the shear-thinning nature of the solution allows it to flow more readily and cross-flow from high to low-permeability zones is promoted. During the demonstration at Joint Base Lewis-McChord, the shear-thinning fluid improved amendment distribution by approximately 41% with enhanced persistence and treatment effectiveness within the lower-k zones of the heterogeneous aquifer. It is anticipated that permeability contrasts of 1-2 orders of magnitude are amenable to this technology (e.g., improving distribution to silt layers within a sand matrix, but not clay layers).


Descriptors :   *BIODEGRADATION , *WASTE TREATMENT , CHLORINATION , COST EFFECTIVENESS , GROUND WATER , INJECTION , PERMEABILITY , SOLVENTS , WATER FLOW


Subject Categories : Solid Wastes Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE