Interplay of biofilm growth, NAPL biodegradation and micro-scale heterogeneity in natural attenuation of aquifers delineated by pore-network modelling

Aminnaji, Morteza; Golfier, Fabrice; Niasar, Vahid; Babaei, Masoud

doi:10.1016/j.advwatres.2020.103750

Cited by 8 publications

(3 citation statements)

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“…Soil and groundwater contamination by petroleum hydrocarbon products is a global common problem separate immiscible phase in the subsurface referred to as light nonaqueous phase liquids (NAPLs) (Mateas et al, 2017). Behaviour of NAPL-derived organic pollutants in aquifer systems mainly depends on dissolution of the contaminants within the source zone, the mass transfer to the flowing groundwater, advection, dispersion, diffusion, sorption (retardation) and biodegradation (Aminnaji et al 2020). The contamination of groundwater by NALPs is a challenging environmental problem that poses risks to both human and the environment (Tsai et al, 2008); thus, soil and groundwater remediation, to achieve environmental sustainability and protect human health, has become the shared vision of various stakeholders, including governments, world organizations, and the public (Honetschlägerová et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

An Overview of Chemical Oxidation Based Remediation technologies for Non-Aqueous Phase Liquids Removal from Soil

2022

Global NEST: The International Journal

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<p>This review provides a general overview of the application of chemical oxidation to hydrophobic contaminants in the form of non-aqueous phase liquids (NAPLs). Three types of chemical oxidation processes, conventional activated persulfate, permanganate, and ozonation, along with three advanced oxidation processes (AOPs), the Fenton process, photocatalysis, and plasma oxidation are presented discussed. In addition, this paper provides a brief insight into the combination of chemical oxidation with other remediation technologies for the efficient removal of NAPLs. The common and wide use of activated persulfate for soil remediation is hindered by the fact that it needs heat activation, whereas the main drawback of using permanganate is the precipitation of manganese oxide at the NAPLs face. In addition, the high cost of equipment at the site restricts the ozone application for in-suit soil remediation. The application of AOPs processes such as Fenton and plasma oxidation has received great attention due to its high removal efficiency. However, photocatalysis technology in the field is difficult because it needs photo energy to run the oxidation process. Although plasma oxidation can degrade contaminants in minutes, some active species have short-lived time that could disappear before entering the soil layer. Ozonation is efficient in treat soils with low moisture and large pore spaces. Nevertheless, the optimal pH for ozonation oxidation is 3, which is hard to achieve in real-world applications. Combining chemical oxidation with other remediation technology is a valuable technique of soil remediation as the synergetic effects may increase the sustainability of the applied process towards green technology for soil remediation.</p>

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Section: Introductionmentioning

confidence: 99%

An Overview of Chemical Oxidation Based Remediation technologies for Non-Aqueous Phase Liquids Removal from Soil

2022

Global NEST: The International Journal

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“…Numerous studies have indicated that NAPL migration in the subsurface is governed by complex mechanisms that are influenced by many factors [ 9 ], including permeability [ 10 ], porosity, pore-size distribution [ 11 ], and the surface properties of the porous media [ 12 , 13 ]. Some scholars have studied pore scale interactions on the transport and fate of organic pollutants [ 14 , 15 ].The migration paths of LNAPLs are uniform pore channels, so porosity and pore size exert a certain control on the migration and interception of LNAPLs. In addition, LNAPLs need to compete with water in pores for pore space, so the saturation of the media is also an important factor affecting the migration of LNAPLs [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the LNAPL Migration Process in the Vadose Zone under Two Different Media Conditions

Zuo

Zhao

Yang

et al. 2021

IJERPH

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This study focused on the processes of free infiltration, precipitation displacement, and natural attenuation of the LNAPL under the condition of near-surface leakage. Sandbox experiments were performed to explore the migration characteristics of LNAPL in the vadose zone with two media structures and the influences of the soil interface on the migration of LNAPL. The results indicate that the vertical migration velocity of the LNAPL infiltration front in medium and coarse sand was 1 order of magnitude higher than that in fine sand and that the LNAPL accumulated at the coarse–fine interface, which acted as the capillary barrier. Displacement of precipitation for LNAPL had little relationship with rainfall intensity and was obviously affected by medium particle size, where coarse sand (40.78%) > medium sand (20.5%) > fine sand (10%). The natural attenuation rate of the LNAPL in the vadose zone was related to the water content of the media; the natural attenuation rate of fine sand was higher. This study simulated the process of the LNAPL leakage from the near surface into the layered heterogeneous stratum, improved the understanding of the migration of the LNAPL under different stratum conditions, and can provide support for the treatment of LNAPL leakage events in the actual site.

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“…In particular, toluene is known to be a degradable material in the underground environment, but analysis of the transport characteristics of toluene is very important, since the removal rate can be changed, depending on environmental conditions. It is necessary to confirm whether the natural attenuation process can be degraded based on the prediction of the behavior of toluene when underground environmental pollution occurs due to an intensified toluene spill [11].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Sorption of Organic Contaminant during Two-Dimensional Transport in Saturated Sand

Lee

Choi

2021

Water

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Multi-dimensional transport studies are necessary in order to better explain the fate of contaminants in groundwater. In this study, a two-dimensional transport experiment with organic contaminants in saturated sand was conducted to investigate the migration of the organic contaminant plume in multi-dimensional flow conditions. The transport test was conducted using toluene as a model organic contaminant in a saturated sand box under steady flow conditions. The initial plume was generated via injection at a point source. After 24 h, the plume distribution was delineated by interpolating toluene concentrations in the porewater samples. The mass centers of the toluene and the conservative tracer were almost coincident, but the size of the toluene plume was significantly reduced in longitudinal as well as transversal directions. The appropriateness of several types of sorption models were compared to describe the toluene sorption in two-dimensional transport system using numerical modeling. Among the sorption models, the Langmuir model was found to be the most appropriate to describe the sorption of toluene during two-dimensional transport. The results showed that two-dimensional experiments are better than one-dimensional column experiments in identifying the adsorption characteristics that occur during transport in saturated aquifers.

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Interplay of biofilm growth, NAPL biodegradation and micro-scale heterogeneity in natural attenuation of aquifers delineated by pore-network modelling

Cited by 8 publications

References 100 publications

An Overview of Chemical Oxidation Based Remediation technologies for Non-Aqueous Phase Liquids Removal from Soil

An Overview of Chemical Oxidation Based Remediation technologies for Non-Aqueous Phase Liquids Removal from Soil

Analysis of the LNAPL Migration Process in the Vadose Zone under Two Different Media Conditions

Nonlinear Sorption of Organic Contaminant during Two-Dimensional Transport in Saturated Sand

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