Supercritical extraction of contaminants from soils and sediments

Anitescu, G.; Tavlarides, Lawrence L.

doi:10.1016/j.supflu.2006.03.024

Cited by 103 publications

(63 citation statements)

References 93 publications

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“…Bondor, 1992). SCC has also been lauded as an environmentally friendly solvent, and its use to decontaminate soils impacted by hazardous organic compound is regarded as a "green" cleanup technology (e.g., Anitescu and Tavlarides, 2006;Green and Akgerman, 1996;Hauthal, 2001;Smyth et al, 1999) because it avoids the use of other more hazardous solvents. Given these considerations, there are good reasons to evaluate the potential for mobilization of organics from deep storage reservoirs to overlying freshwater aquifers upon leakage from CCS operations.…”

Section: Mobilization and Transport Of Organicsmentioning

confidence: 99%

“…In addition, the increased dissolved CO 2 concentrations could result in desorption of metals such as arsenic (As) by competitive sorption of carbonate ions (Appelo et al, 2002). Second, because supercritical CO 2 (SCC) is also an excellent solvent for organic compounds (Anitescu and Tavlarides, 2006), concerns have been raised about the potential mobilization of organic constituents from depth and subsequent transport to shallow drinking water bodies via leakage pathways. Third, co-injectants such as H 2 S, if migrating with leaking CO 2 , may exacerbate the impact on groundwater quality by the formation of strong metal-sulfide complexes, reductive dissolution of metal-sorbing Fe(III) hydroxides, and/or strong effects of pH decrease from sulfide oxidation Xu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Zheng¹,

Spycher²,

Xu³

et al. 2010

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Section: Mobilization and Transport Of Organicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Zheng¹,

Spycher²,

Xu³

et al. 2010

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“…[23] All of the above-listed methods are characterized by long and multistage procedures for sample preparation using a large volume of toxic organic solvents, typically 50-450 ml per sample. [24] Some prospective methods were recently developed for PAH extraction from various solid matrices using water or carbon dioxide under sub-or supercritical conditions. Suband supercritical water extractions have become popular green extraction methods for various classes of compounds in numerous environmental, food and pharmaceutical matrices.…”

Section: Introductionmentioning

confidence: 99%

Solubility of Benzo[a]pyrene and Organic Matter of Soil in Subcritical Water

et al. 2015

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A dynamic subcritical water extraction method of benzo [a]pyrene from soils is under consideration. The optimum conditions for benzo [a]pyrene extraction from soil are described including the soil treatment by subcritical water at 250 °C and 100 atm for 30 min. The effectiveness of developed method was determined using the matrix spiking recovery technique. A comparative analysis was made to evaluate the results of benzo[a]pyrene extraction from soils using the subcritical water and organic solvents. The advantages of the subcritical water extraction involve the use of ecologically friendly solvent, a shorter time for the analysis and a higher amount of benzo[a]pyrene extracted from soil (96 %). The influence of subcritical water extraction on soil properties was measured the investigation of the processes occurring within soil under the influence the high temperature and pressure. Under appropriate conditions of the experiment there is the destruction of the soil organic matter while the composition of the soil mineral fraction remains practically unchanged.

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“…Various technologies, including land burial, microbial degradation, solvent extraction, thermal desorption and incineration, have been developed for removal and disposal of PCBs from soil [6,7]. Among these technologies, an in situ capping approach using activated carbon and reactive metal particles has been extensively studied due to its less invasive nature [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies implied that the longer a spiked contaminant was allowed to interact with the matrix, the higher unextractable fraction became [19][20][21]. In addition, freshly spiked pollutants can often be removed using relatively mild conditions, whereas quantitative removal of aged pollutants often requires higher temperature [6] and longer time as confirmed by supercritical fluid extraction. But as for supercritical fluid extraction, it was observed that the high temperature and pressure resulted in chemical alteration of the extracted pollutants in some instances [22].…”

Section: Introductionmentioning

confidence: 99%

Advantage of solvothermal procedure for polychlorinated biphenyls removal from e-waste contaminated site

Zhang

Zhu

Zhang

2011

Chemical Engineering Journal

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a b s t r a c tPolychlorinated biphenyls (PCBs) are environmentally persistent, toxic, bioaccumulative and recalcitrant. In this study, aged PCBs from e-waste contaminated site were respectively subjected to Soxhlet and solvothermal treatments. The results indicated that solvothermal method was much more predominant for PCBs removal than traditional Soxhlet method. Sequential Soxhlet-solvothermal experiment demonstrated that Soxhlet unextractable (bound) PCBs were efficiently removed by solvothermal procedure due to enhanced solvating effects of organic solvents. The key point was that bound PCBs in the aged soil were partitioned in different components of soil organic matter, e.g., the solvothermal removal amounts of I-V PCBs (sum of PCB8, PCB18, PCB28, PCB44, PCB66) from fulvic acid (FA), humic acid (HA), bound humic acid (bound HA), bound lipids and mineral fraction were 0.4, 40.8, 28.4, 19.8, and 10.6%, respectively. It was found that isopropanol was the most effective solvent for PCBs removal. The optimum performing temperature, time and liquid to solid ratio for PCB8, PCB18, PCB28, PCB44, and PCB66 were 170 • C, 8 h and 10:1, respectively. As for higher molecular weight PCB congeners, these conditions were 150 • C, 10 h and 15:1. Soil organic matter content was unchanged after solvothermal treatment indicating that soil fertility remained after the removal process. This work provides a more clean process for effective treatment of soils contaminated by persistent organic pollutants (POPs) in comparison to traditional methods.

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Supercritical extraction of contaminants from soils and sediments

Cited by 103 publications

References 93 publications

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems

Solubility of Benzo[a]pyrene and Organic Matter of Soil in Subcritical Water

Advantage of solvothermal procedure for polychlorinated biphenyls removal from e-waste contaminated site

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