Comparison of direct benthic flux to ebullition-facilitated flux of polycyclic aromatic hydrocarbons and heavy metals measured in the field

Viana, Priscilla; Yin, Ke; Rockne, Karl J.

doi:10.1007/s11368-017-1893-z

Cited by 7 publications

(4 citation statements)

References 42 publications

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“…In such a scenario, OC would provide effective advective sequestration and the sand layer would contribute to geotechnical stability and as a thicker diffusive pathway. In addition, an OC layer placed in a geotextile mat may help reduce the potential for formation of preferential pathways due to gas ebullition that could facilitate breakthrough of contaminants through the cap (Kaliappan 2016;Viana et al 2017;Viana et al 2012), scouring of reactive material, biointrusion, and mixing of reactive material with sediments, and provides uniform distribution of reactive material.…”

Section: Discussionmentioning

confidence: 99%

Modeling Organic Contaminant Transport through Reactive Media

2018

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We modeled the transport of 12 organic compounds through five different reactive media under diffusion and advection using deterministic and Monte Carlo methods to evaluate their effectiveness for sediment capping and/or liners. A broad range of media-contaminant-site scenarios are provided to aid in the selection of reactive media to address a broad range of organic sediment contaminants under diffusion or advection scenarios. Organic compounds evaluated include monoaromatics, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and alkanes covering a wide range of organic pollutants commonly found in contaminated sites. We investigated the performance of the reactive media granular activated carbon (GAC), organoclay (OC), shredded tires (ST), and apatite (AP) in comparison to the performance of conventional sand media. Based on the modeling results, a 2-centimeter (cm) GAC layer is predicted to be as effective to reduce organic-contaminant transport as a 1-to 3-meter thick sand layer. Performances of GAC and OC were similar under both diffusion and advection due to their low observed diffusivity coefficients. As expected, low molecular weight compounds (e.g. monoaromatics and naphthalene) present a higher potential release risk. In contrast, pyrene, hexachlorobiphenyl and tetradecane do not present toxicity concerns at the 95% confidence level after 100 years under diffusion and/or advection (except in AP/sand configurations). Lower acute toxicity contaminants like benzene and dichlorobiphenyl are predicted to behave similarly for most media under advection, with partial breakthrough within 100-years. Performance uncertainty is substantially lower for organic-contaminant transport simulations compared to those in a previous metal-contaminant transport study. The relative GAC and OC effectiveness increases with increasing contaminant hydrophobicity. This behavior may be a key decision factor to select GAC and/or OC media at sites with highly hydrophobic and low toxicity/solubility ratio contaminants like dichlorobiphenyls.

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Section: Discussionmentioning

confidence: 99%

Modeling Organic Contaminant Transport through Reactive Media

2018

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“…Consumption or release of water volume that can be monitored over time affects the measured metal concentration. A decrease in concentration occurs due to the consumption of water volume, whereas an increase in concentration occurs due to the volume of water released (Viana et al 2018). Important points in this method are the guaranteed cleanliness of the instrument and the required sample volume at discrete time intervals for subsequent shipboard or laboratory analyses (Homoky et al 2016).…”

Section: In Situ Benthic Incubationmentioning

confidence: 99%

“…A number of methods have been developed to measure the benthic flux of trace metals, such as a sedimentporewater profile using gradient concentration (Cheng et al 2019;Duan et al 2019;Kalnejais et al 2015;Ni et al 2017;Santos-Echeandia et al 2009), in situ benthic chamber (Frogner-Kockum et al 2020;Han et al 2016), moored sediment trap (Buesseler et al 2007;Pohl et al 2004), benthic boundary layer profile (Croot et al 2019), the 224 Th/ 228 Ra disequilibrium method (Shi et al 2018;Vieira et al 2019), and isotopic mass balance data (Little et al 2014). Gradient concentration and benthic chambers are the two most commonly used methods for measuring benthic fluxes of trace metals from the sediment to the overlying water, or vice versa (Viana et al 2018). Both methods have many advantages, although each still has limitations.…”

Section: Introductionmentioning

confidence: 99%

Two Approaches to Measure Trace Metals Fluxes at the Sediment–Water Interface: Sediment Porewater Profile and Benthic Incubation

Harmesa

Wahyudi

2020

AJSTD

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The biogeochemical cycle of trace metals is very likely affected by the global change in the ocean, especially due to the increasing of sea surface temperature and acidity. Thus, assessing biogeochemical cycle of trace metals will beneficial in elucidating the potential impact of climate change as well as ocean acidification. The assessment of the biogeochemical cycle of trace metals can be performed by measuring trace metals fluxes crossing the sediment-water interface. The main challenge in this measurement is the difficulty of measuring metal concentrations at trace levels due to either physical factors or biological factors that can affect the total flux. Sediment porewater profile and in situ benthic incubation are the two most commonly used methods for measuring trace metals fluxes from sediment to the overlying water or vice versa. The coefficient of diffusion and gradient of concentration are the two most important values in the sediment porewater profile method, while the constant volume involved in the container during the experiment is an important part of the in situ benthic incubation method. The purpose of this review is to provide an overview of both measurement methods deeply and predict the challenges faced in its implementation in Indonesia. Keywords: Benthic fluxes; Overlying water; Porewater; Sediment; Trace metals

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“…Heavy metals could also bind to sediment matrices due to the porous nature and absorptive ability of sediment or soil organic matter. The sediment pollution has persisted over time and poses a significant challenge for the restoration of these water bodies [ 2 , 3 ]. The Environmental Protection Agency (US, EPA) has estimated that there are 1.2 billion cubic meters of contaminated surficial sediments in the US that could pose a risk to surface water resources, pollutant transport, public exposure, and even the security of drinking water supply [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Nanobubbles in Pore Water on Heavy Metal Pollutant Release from Contaminated Soil Columns

et al. 2023

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This study investigated the release of heavy metals from polluted soil under the pore water flow containing nanobubbles (NBs) to simulate natural ebullition. Three types of NBs (CH4, H2, and CO2) were generated in water and characterized, including bubble size, zeta potential, liquid density, and tension. The flow rate used in column tests was optimized to achieve proper soil fluidization and metal desorption or release. The leachate chemistries were monitored to assess the effect of NBs on conductivity, pH, oxidation–reduction potential (ORP), and dissolved oxygen (DO). The results showed that NBs in the pore water flow were significantly more effective in releasing Pb compared to DI water, with CO2 NB water being the most effective and H2 NB water being the least effective. CO2 NB water was also used to rinse column soil contaminated with four different metals (Pb, Cu, Zn, and Cr), which exhibited different leaching kinetics. Moreover, a convective–dispersion–deposition equation (CDDE) model accurately simulated the leaching kinetics and explained the effects of NBs on the key parameters, such as the deposition rate coefficient (Kd), that affect the released metal transport. The findings could provide new insights into soil pollutant release under ebullition and soil remediation using water wash containing NBs.

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Comparison of direct benthic flux to ebullition-facilitated flux of polycyclic aromatic hydrocarbons and heavy metals measured in the field

Cited by 7 publications

References 42 publications

Modeling Organic Contaminant Transport through Reactive Media

Modeling Organic Contaminant Transport through Reactive Media

Two Approaches to Measure Trace Metals Fluxes at the Sediment–Water Interface: Sediment Porewater Profile and Benthic Incubation

Impacts of Nanobubbles in Pore Water on Heavy Metal Pollutant Release from Contaminated Soil Columns

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