Polychlorinated biphenyl (PCB) partition equilibrium between St. Lawrence River sediments and supercritical fluids

Wu, Zhou; Anitescu, G.; Tavlarides, Lawrence L.

doi:10.1016/s0896-8446(03)00012-3

Cited by 13 publications

(17 citation statements)

References 26 publications

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“…For example, a process conceptual analysis at Syracuse University revealed that multidisciplinary studies of solute solubility in SCFs, partition equilibrium, and laboratoryand bench-scale desorption were needed to accomplish the proposed objective [36][37][38][39][40][41][42][43][44][45]. Original laboratory equipment was designed, constructed, commissioned, and used to carry out experiments for all of these fields of interest.…”

Section: Solubility Studiesmentioning

confidence: 99%

“…PCB partition equilibrium studies between SCCD and three real-world St. Lawrence River sediments with similar properties and PCB congener distribution patterns but different total PCB concentrations were conducted at 50 • C and 76-178 bar (five different SCF densities) [39]. The data were analyzed for both total PCBs and 12 major individual congeners detected in the sediments.…”

Section: Partition Equilibriamentioning

confidence: 99%

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Supercritical extraction of contaminants from soils and sediments

Anitescu

Tavlarides

2006

The Journal of Supercritical Fluids

103

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Section: Solubility Studiesmentioning

confidence: 99%

Section: Partition Equilibriamentioning

confidence: 99%

Supercritical extraction of contaminants from soils and sediments

Anitescu

Tavlarides

2006

The Journal of Supercritical Fluids

103

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“…The details of these methods are presented elsewhere. 2,23 Essentially, a sediment extract of PCBs in hexane and a series of diluted solutions of this extract are employed as new standard solutions for each type of sediment sample. These solutions match both PCB congener distribution and the composition range of the samples taken from the experiments.…”

Section: Description Of the Pcb-polluted Sedimentsmentioning

confidence: 99%

“…2,23 Also, the initial desorption rate in the supercritical CO 2 /MeOH fluid is faster than that in the supercritical CO 2 only, and the final PCB residual concentration is much lower. Further, it is observed that no significant PCB congener pattern shift occurs from the initial to the final distribution for either system ( Figure 2).…”

Section: Laboratory Scalementioning

confidence: 99%

Desorption of Polychlorinated Biphenyls from Contaminated St. Lawrence River Sediments with Supercritical Fluids

Anitescu

Tavlarides

2003

Ind. Eng. Chem. Res.

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Laboratory-and bench-scale polychlorinated biphenyl (PCB) desorption experiments using supercritical fluids are conducted on air-dried, contaminated St. Lawrence River sediments (SLRS) to demonstrate the remediation and scale-up potential of the process. Laboratory-scale desorption experiments reveal that PCB concentrations can be reduced from 2200 ppm to less than 5 ppm in 60 min (99.77% extraction efficiency) when supercritical CO 2 with 5 mol % methanol is used at 118 bar and 323 K. Similar or better results are achieved at a bench-scale size of 2 L volume (400 × scale-up) under similar conditions. It is found that the PCB concentration in the sediments can be reduced from 1840 ppm to less than 5 ppm in ∼40 min (>99.73% extraction efficiency). The final PCB concentrations after 60 min of extraction are around 3 ppm, which is comparable with the final PCB concentrations of ∼4 ppm for the laboratory-scale experiments (when the supercritical fluid is CO 2 /MeOH). These results suggest that the scale-up factors are not significant over this range on the desorption processes of PCBs from real-world SLRS. A two-step linear driving force model is shown to predict well the benchscale desorption results when using a model obtained independently and the effective diffusion coefficients and mass-transfer coefficients determined from the laboratory-scale information.

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“…Although PCBs can be extracted from mud using acetone and other chemicals using existing techniques, there have been problems with the acetone residue in the environment (9)- (11) . The extraction also involves a cleaning cost because heating is required to vaporize the acetone residue.…”

Section: Introductionmentioning

confidence: 99%

Clean up Process for Oil-polluted Materials by Using Liquefied DME

Kanda

Makino

2009

JEE

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The proposed technology is a new concept that aims at energy-efficient drying and cleanup for general purposes by the use of liquefied DME (dimethyl ether) gas. Large amounts of energy are required for the cleanup of the ground since the water contained in the soil hinders the extraction processes that use hydrophobic organic solvents. Therefore, we focus on the use of liquiefied DME, which is eco-friendly, as an extractant. The saturated pressure of DME is moderate-0.51 MPa at 20°C and 0.68 MPa at 30°C. Liquefied DME resolves high volume organic contaminants and water. Moreover, water can be easily separated from DME by flash distillation. This technology reduces the energy required for water-removal to half the latent heat of water. We almost completely removed water and other oily materials by using DME. DME was completely recycled and none of it remained in these materials. The world's first prototype of a DME deoiling/dewatering process is shown. The capacity of this system is 10 L. Because of the low normal boiling point (-25°C) of DME, it does not remain in the soil and it can thus be reused as an extractant. In this presentation, we show the general purpose deoiling and dewatering processes for several materials.

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Polychlorinated biphenyl (PCB) partition equilibrium between St. Lawrence River sediments and supercritical fluids

Cited by 13 publications

References 26 publications

Supercritical extraction of contaminants from soils and sediments

Supercritical extraction of contaminants from soils and sediments

Desorption of Polychlorinated Biphenyls from Contaminated St. Lawrence River Sediments with Supercritical Fluids

Clean up Process for Oil-polluted Materials by Using Liquefied DME

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