Combination of steam-enhanced extraction and electrical resistance heating for efficient remediation of perchloroethylene-contaminated soil: Coupling merits and energy consumption

Highlights

● Coupling merits of SEE and ERH were explored by a laboratory-scale device.

● SEE promotes the soil electrical conductivity and ERH process.

● Preheating soil by ERH improves the soil permeability and SEE.

● Combined method is more energy-efficient for perchloroethylene extraction.

Abstract

In situ thermal desorption (ISTD) technology effectively remediates soil contaminated by dense nonaqueous phase liquids (DNAPLs). However, more efforts are required to minimize the energy consumption of ISTD technology. This study developed a laboratory-scale experimental device to explore the coupling merits of two traditional desorption technologies: steam-enhanced extraction (SEE) and electrical resistance heating (ERH). The results showed that injecting high-density steam (> 1 g/min) into loam or clay with relatively high moisture content (> 13.3%) could fracture the soil matrix and lead to the occurrence of the preferential flow of steam. For ERH alone, the electrical resistance and soil moisture loss were critical factors influencing heating power. When ERH and SEE were combined, preheating soil by ERH could increase soil permeability, effectively alleviating the problem of preferential flow of SEE. Meanwhile, steam injection heated the soil and provided moisture for maintaining soil electrical conductivity, thereby ensuring power stability in the ERH process. Compared with ERH alone (8 V/cm) and SEE alone (1 g/min steam), the energy consumption of combined method in remediating perchloroethylene-contaminated soil was reduced by 39.3% and 52.9%, respectively. These findings indicate that the combined method is more favorable than ERH or SEE alone for remediating DNAPL-contaminated subsurfaces when considering ISTD technology.

Graphical abstract

Keywords

Steam-enhanced extraction / Electrical resistance heating / Dense nonaqueous phase liquid / Soil remediation / Energy consumption

References

[1] Archie G E . (1942). The electrical resistivity log as an aid in determining some reservoir characteristics. Transactions of the AIME, 146( 1): 54– 62

[2] Arps J J . (1953). The effect of temperature on the density and electrical resistivity of sodium chloride solutions. Journal of Petroleum Technology, 5( 10): 17– 20

[3] Brouwers H J H , Gilding B H . (2006). Steam stripping of the unsaturated zone of contaminated sub-soils: the effect of diffusion/dispersion in the start-up phase. Journal of Contaminant Hydrology, 83( 1−2): 1– 26

[4] Cai J , Wei W , Hu X , Wood D A . (2017). Electrical conductivity models in saturated porous media: A review. Earth-Science Reviews, 171 : 419– 433

[5] Carrigan C R , Nitao J J . (2000). Predictive and diagnostic simulation of in situ electrical heating in contaminated, low-permeability soils. Environmental Science & Technology, 34( 22): 4835– 4841

[6] Chen W Z , Ma Y S , Yu H D , Li F F , Li X L , Sillen X . (2017). Effects of temperature and thermally-induced microstructure change on hydraulic conductivity of Boom Clay. Journal of Rock Mechanics and Geotechnical Engineering, 9( 3): 383– 395

[7] Cho W J , Lee J O , Chun K S . (1999). The temperature effects on hydraulic conductivity of compacted bentonite. Applied Clay Science, 14( 1−3): 47– 58

[8] Davis E L (1998). Steam Injection for Soil and Aquifer remediation. US. Environmental Protection Agency

[9] Ding D , Song X , Wei C , LaChance J . (2019). A review on the sustainability of thermal treatment for contaminated soils. Environmental Pollution, 253 : 449– 463

[10] USEPA (2004). In Situ Thermal Treatment of Chlorinated Solvents: Fundamentals and Field Applications, EPA 542-R-04–010 . Washington, DC: Office of Solid Waste and Emergency Response

[11] Fournier R, Thibodeau M, French C T (2009). Measurement of steam generator or reactor vessel moisture carryover using a non-radioactive chemical tracer, International Conference on Nuclear Engineering, 459–467

[12] Geng Z , Liu B , Li G , Zhang F . (2021). Enhancing DNAPL removal from low permeability zone using electrical resistance heating with pulsed direct current. Journal of Hazardous Materials, 413 : 125455

[13] Han Z , Jiao W , Tian Y , Hu J , Han D . (2020). Lab-scale removal of PAHs in contaminated soil using electrical resistance heating: Removal efficiency and alteration of soil properties. Chemosphere, 239 : 124496

[14] Heron G , Carroll S , Nielsen S G . (2005). Full-scale removal of DNAPL constituents using steam-enhanced extraction and electrical resistance heating. Ground Water Monitoring and Remediation, 25( 4): 92– 107

[15] Heron G , Van Zutphen M , Christensen T H , Enfield C G . (1998). Soil heating for enhanced remediation of chlorinated solvents: A laboratory study on resistive heating and vapor extraction in a silty, low-permeable soil contaminated with trichloroethylene. Environmental Science & Technology, 32( 10): 1474– 1481

[16] Horst J , Munholland J , Hegele P , Klemmer M , Gattenby J . (2021). In situ thermal remediation for source areas: technology advances and a review of the market From 1988–2020. Ground Water Monitoring and Remediation, 41( 1): 17– 31

[17] Kaslusky S F , Udell K S . (2005). Co-injection of air and steam for the prevention of the downward migration of DNAPLs during steam enhanced extraction: an experimental evaluation of optimum injection ratio predictions. Journal of Contaminant Hydrology, 77( 4): 325– 347

[18] Triplett Kingston J L , Dahlen P R , Johnson P C . (2010). State-of-the-practice review of in situ thermal technologies. Ground Water Monitoring and Remediation, 30( 4): 64– 72

[19] Li J , Wang L , Peng L , Deng Y , Deng D . (2020). A combo system consisting of simultaneous persulfate recirculation and alternating current electrical resistance heating for the implementation of heat activated persulfate ISCO. Chemical Engineering Journal, 385 : 123803

[20] Martin E J , Kueper B H . (2011). Observation of trapped gas during electrical resistance heating of trichloroethylene under passive venting conditions. Journal of Contaminant Hydrology, 126( 3−4): 291– 300

[21] Martin E J , Mumford K G , Kueper B H . (2016). Electrical resistance heating of Clay layers in water-saturated sand. Ground Water Monitoring and Remediation, 36( 1): 54– 61

[22] Munholland J (2015). Electrical Resistance Heating of Groundwater Impacted by Chlorinated Solvents in Heterogeneous Sand [Diss]

[23] Munholland J L , Mumford K G , Kueper B H . (2016). Factors affecting gas migration and contaminant redistribution in heterogeneous porous media subject to electrical resistance heating. Journal of Contaminant Hydrology, 184 : 14– 24

[24] Newmark R L Aines R D (1995). Summary of the LLNL Gasoline Spill Demonstration-Dynamic Underground Stripping Project. Lawrence Livermore National Laboratory

[25] Peng S , Wang N , Chen J . (2013). Steam and air co-injection in removing residual TCE in unsaturated layered sandy porous media. Journal of Contaminant Hydrology, 153 : 24– 36

[26] Piquemal J . (1994). Saturated steam relative permeabilities of unconsolidated porous media. Transport porous. El Medico, 17( 2): 105– 120

[27] Sleep B E , McClure P D . (2001). Removal of volatile and semivolatile organic contamination from soil by air and steam flushing. Journal of Contaminant Hydrology, 50( 1−2): 21– 40

[28] Stephenson K M , Novakowski K , Davis E , Heron G . (2006). Hydraulic characterization for steam enhanced remediation conducted in fractured rock. Journal of Contaminant Hydrology, 82( 3-4): 220– 240

[29] Trine L S D , Davis E L , Roper C , Truong L , Tanguay R L , Simonich S L M . (2019). Formation of PAH derivatives and increased developmental toxicity during steam enhanced extraction remediation of creosote contaminated Superfund soil. Environmental Science & Technology, 53( 8): 4460– 4469

[30] Tse K K C , Lo S L , Wang J W H . (2001). Pilot study of in-situ thermal treatment for the remediation of pentachlorophenol-contaminated aquifers. Environmental Science & Technology, 35( 24): 4910– 4915

[31] Tzovolou D N , Aggelopoulos C A , Theodoropoulou M A , Tsakiroglou C D . (2011). Remediation of the unsaturated zone of NAPL-polluted low permeability soils with steam injection: An experimental study. Journal of Soils and Sediments, 11( 1): 72– 81

[32] Zhang T , Lowry G V , Capiro N L , Chen J , Chen W , Chen Y , Dionysiou D D , Elliott D W , Ghoshal S , Hofmann T . . (2019). In situ remediation of subsurface contamination: Opportunities and challenges for nanotechnology and advanced materials. Environmental Science. Nano, 6( 5): 1283– 1302

Acknowledgements

This study was supported by the National Key R&D Program of China (No. 2019YFC1805700).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-022-1582-z and is accessible for authorized users.

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