An In Situ Microcosm study was conducted to evaluate MNA vs. enhanced anaerobic bioremediation via sulfate reduction at a petroleum impacted site. Site managers asked: “Will the injection of sulfate stimulate anaerobic BTEX biodegradation at this site?” The answer was yes. The ISM study showed conclusively that injection of sulfate at the site would increase the growth of…
An In Situ Microcosm study was conducted to evaluate MNA vs. enhanced aerobic bioremediation at a petroleum impacted site. Site managers asked: “Will the injection of an oxygen releasing compound stimulate BTEX biodegradation at this site?” The answer was yes. The ISM study showed conclusively that injection of the an oxygen releasing compound at the site will increase…
A pilot study was conducted at a site where electron donor was injected into groundwater impacted by a mixture of chlorinated solvents. Site managers asked two questions: “Did the electron donor injection stimulate reductive dechlorination?” and “Did injection of the electron donor also increase the potential for abiotic dechlorination through the generation of biogenic FeS?”…
A homeowner dependent on a domestic water well suddenly saw an accumulation of a black precipitant clogging the pre-filter of their water treatment system. Two years previous to this observation there was a release of gas condensate hydrocarbons and saltwater upgradient of their property. The homeowner and their attorneys asked “Is this black precipitant evidence…
Next generation sequencing (NGS) was performed on liquid samples from key locations with different operating conditions. NGS revealed diverse microbial communities and the presence of microbial groups commonly implicated in MIC including sulfate reducing bacteria (SRB), methanogens, and acetogens. In conjunction with a review of operating conditions, corrosion monitoring, and inspections, the NGS results added a…
QuantArray®-MIC was performed on swab samples from internally pitted and adjacent non-pitted areas of pipeline components as part of a multiple lines of evidence approach to evaluate microbiologically influenced corrosion (MIC). Concentrations of Total Bacteria, Total Archaea, sulfate reducing bacteria (SRB), methanogens, and other microorganisms commonly implicated in MIC were orders of magnitude greater in the…
Mass reduction by DPE and SVE at a hydrocarbon- and MTBE-impacted site had become uneconomical. Site managers asked: “Can we transition to MNA?” The answer, for the most part, was yes. Post SVE, hydrocarbon and MTBE concentrations showed decreasing trends in most monitoring wells. Additional strong lines of evidence for in situ biodegradation of benzene and MTBE under…