Dnapl Phase Articles & Analysis
31 articles found
Trap & Treat BOS 100 was used to successfully reduce contaminant mass in a localized Trichloroethylene hot spot as part of a pilot test at a former missile site in Nebraska. Over 99% reduction has been achieved in the pilot test well over three and a half years. ...
ERDENHANCED™ (2,600 pounds) deployed in 2001 via direct-push technology (26 nodes) into two, silty-clay, laterally continuous, hydraulically conductive source zones; baseline concentration of Trichloroethylene (TCE) ≈97,400 micrograms per liter (μg/L), roughly 9% solubility of TCE, indicating significant residual source mass in saturated soils as non-aqueous phase ...
Hydrogeology includes 15 to 20 feet of alluvial silty clay or gravelly sand overlying fractured sandstone with estimated 10-foot thick interval of dense non-aqueous phase liquid (DNAPL) trapped in primary/secondary porosity of shallow bedrock. ...
Chlorinated volatile organic compounds (cVOC) documented in soil-groundwater in concentrations indicative of dense non-aqueous phase liquid (DNAPL) trapped in primary-secondary porosity of generally coarse, highly weathered shale. ...
Baseline concentrations of trichloroethylene (TCE) ≈97,400 micrograms per liter (µg/L); roughly 9% solubility, indicating significant residual source mass in saturated soils as non-aqueous phase liquid (NAPL). Results: Post 6-months deployment TCE decreased 86%, followed by 4-5 years of enhanced solubilization of residual parent PCE DNAPL into ...
ABSTRACT High density sampling program was key to remediation of soil and groundwater impacted by TCE DNAPL at a former industrial site underlain by river deposits and sedimentary bedrock. ...
ERH effectively treats the subsurface by volatilizing dense non-aqueous phase liquid (DNAPL) and VOCs, recovering the vapor, and treating the vapor by conventional technologies such as granular activated carbon or thermal oxidation. ...
(TRS) designed, installed and operated an electrical resistance heating (ERH) source area remediation project at a former commercial laundry and dry cleaning facility in the rapidly growing area of South Lake Union in Seattle, WA, The scope of the remediation was to treat tetrachloroethene (PCE) as dense non-aqueous phase liquid (DNAPL) underlying, and adjacent ...
Guaranteed remediation of TCE in soil under active vehicle maintanence facility Project Summary TRS Group implemented an electrical resistance heating (ERH) guaranteed remediation with Conestoga Rovers Associates (CRA) to remove trichloroethylene (TCE) under an active vehicle maintenance facility (Site) in Broadview, Illinios, TCE concentrations in soil were measured at levels indicative of ...
The process was repeated in a second phase that reversed the injection/extraction well pairs. Overall, 18,480 pounds of EOS were injected and 163,000 gallons of water were recirculated through the source area. ...
The optimization design of surfactant-enhanced aquifer remediation for dense non-aqueous phase liquids (DNAPLs)-contaminated groundwater is proposed through integrating simulation and optimization models. ...
In this paper, an integrated optimization method based on adaptive Kriging surrogate models was proposed and applied to the cost optimization of a surfactant enhanced aquifer remediation process for dense non-aqueous phase liquids (DNAPLs). First, the initial samples were created by Latin hypercube sampling, and then the responses corresponding to the initial ...
Abstract Performance and rebound of intensive source depletion technologies were evaluated at 59 chlorinated solvent sites where remediation targeted dense non-aqueous phase liquid (DNAPL) source zones. The four technologies included in the study are chemical oxidation, enhanced bioremediation, thermal treatment, and surfactant/cosolvent flushing. ...
Environmental Protection Agency expert panel on dense non-aqueous phase liquid (DNAPL) remediation concluded that uncertainty in the costs and benefits of applying source depletion technologies (i.e., active remediation in source zones) is one key factor that discourages widespread use of these technologies at DNAPL sites (Kavanaugh et al., ...
Abstract A Montreal chemical refinery reduced the dichlorobenzene and other dense non-aqueous phase liquid (DNAPL) impacts on the soil and groundwater where a railway line is adjacent to an above ground storage tank farm. ...
The remediations targeted regions where dense non-aqueous phase liquid (DNAPL) was considered very likely, with contaminant concentrations greater than 10% of the water solubility limit. Pre-treatment groundwater concentrations were as high as 204,000 µg/l chlorobenzene and 990,000 µg/l trichloroethene. DNAPL was successfully removed ...
Levels of COCs reached 6 mg/l for VOCs and 1,200 mg/l for PAHs in the dissolved phase and 8,500 mg/l for VOCs, 36,000 for PAHs and 900,000 mg/l for TPH in NAPL. ...
Abstract: Remediation of coal tar at former Manufactured Gas Plant (MGP) sites, and creosote associated with wood preservative sites is challenging due to the viscous nature of the dense non-aqueous phase liquid (DNAPL) and the modest solubility and vapor pressure of the contaminants of concern (COCs). DNAPL seepage into surface water bodies, as ...
There has been less attention, however, on source removal, such as of dense non-aqueous phase liquid (DNAPL) source areas. At sites where achievement of stringent remedial goals is necessary in a short timeframe, aggressive source remediation is required. ...
ERH effectively treats the subsurface by volatilizing dense non-aqueous phase liquid (DNAPL) and VOCs, recovering the vapor, and treating the vapor by conventional technologies such as granular activated carbon or thermal oxidation. ...