Tracer studies for evaluation of in situ air sparging and in-well aeration system performance at a gasoline-contaminated site

In Situ Biosurfactant Production by Bacillus Strains Injected into a Limestone Petroleum Reservoir

“…Bromide was used as a conservative tracer to estimate the amount of dilution of the nutrient package by dispersion in the formation (4,39). The bromide recovery factor was calculated for each of the three wells that had total volu- a Acetate, lactate, ethanol, 2,3-butanediol, nitrite, the biosurfactant, total heterotrophic bacteria, and biosurfactant producers were not detected in any of the samples before injection.…”

Interphase mass transfer between fluids in subsurface formations: A review

“…Heron et al [135] showed that air sparging is not effective for pooled DNAPLs since both DNAPL pools and the air injection point typically reside at the bottom of the aquifer and horizontal movement of air channels is limited. Berkey et al [136] reported substantial short circuiting of air channels in fine sand (silty sand). Thomson et al [137] and Waduga et al [138] reported that the prediction of accurate recovery rates necessitates the accurate topology of the air channels and NAPL.…”

Using radon-222 as indicator for the evaluation of the efficiency of groundwater remediation by in situ air sparging

“…An alternative or supplementary approach is an indirect estimation of both, IAS range and efficiency, by using artificial or naturally occurring partitioning tracers. In previous studies artificial gas tracers such as SF 6 (Johnson et al, 2001) or helium (Berkey et al, 2003) have been suggested for approaching the problem. However, laboratory analysis for SF 6 or helium is not trivial either.…”