Biogeochemical cycling of heavy metals in lake sediments: impact of multispecies diffusion and electrostatic effects

Li, Jianing
Sengor, S. Sevinc
Fate and transport of heavy metals is controlled by the biogeochemical processes in the environment. Reactive transport modeling is particularly important for capturing the complex interplay between the microbial community dynamics and redox-stratified environments. The focus of this study is to investigate the impacts of (i) multicomponent diffusion (MCD) and (ii) electrical double layer (EDL) on reactive diffusive transport of heavy metals at Lake Coeur d'Alene (LCdA) sediments. The solute benthic fluxes at LCdA sediments are controlled by diffusion, and therefore, the biogeochemical model is focused purely on diffusive transport. In diffusive transport-dominated multicomponent systems, species-specific multicomponent diffusion (i.e., Nernst-Planck representation of diffusion) and the explicit treatment of electrostatic effects can play an important role on the overall dynamics of biogeochemical cycling of metals in the system. The results of this study demonstrate that the use of single uniform diffusion coefficient for all species in purely diffusion-dominated sediments may underestimate the mobility of heavy metals undergoing complex reaction network. This outcome is further signified when explicit treatment of EDL effects is considered in addition to MCD. The simulation results also illustrate the importance of aqueous metal (bi)sulfide complexes, especially when MCD and EDL effects are implemented in reactive transport simulations, impacting the solubility and dynamics of heavy metals in diffusion-dominated systems. The competitive effects of Fe-reducing bacteria FRB and sulfate reducing bacteria SRB activities on pH and overall biogeochemical processes are also demonstrated with multispecies diffusion and explicit treatment of electrostatic effects in the system.


Microbially mediated kinetic sulfur isotope fractionation: reactive transport modeling benchmark
Cheng, Yiwei; Arora, Bhavna; Şengör, Sema Sevinç; Druhan, Jennifer L.; Wanner, Christoph; van Breukelen, Boris M.; Steefel, Carl (Springer Science and Business Media LLC, 2020-08-01)
Microbially mediated sulfate reduction is a ubiquitous process in many subsurface systems. Isotopic fractionation is characteristic of this anaerobic process, since sulfate-reducing bacteria (SRB) favor the reduction of the lighter sulfate isotopologue ((SO42-)-O-32) over the heavier isotopologue ((SO42-)-O-34). Detection of isotopic shifts has been utilized as a proxy for the onset of sulfate reduction in subsurface systems such as oil reservoirs and aquifers undergoing heavy metal and radionuclide bioreme...
Bioavailability evaluation, uptake of heavy metals and potential health risks via dietary exposure in urban-industrial areas
Yousaf, Balal; Liu, Guijian; Wang, Ruwei; Imtiaz, Muhammad; Zia-ur-Rehman, Muhammad; Munir, Mehr Ahmed Mujtaba; Niu, Zhiyuan (2016-11-01)
A verity of human activities i.e. urbanization and industrialization have been resulted serious environmental contaminations by heavy metals in all over the world. The settlement of populations in urban and nearby industrial areas for economic development has significant share in their exposure to these metallic contaminants. Depending on the nature and type of the pollutants, targeted urban-industrial environments can have harmful and chronic health risk impacts on exposed local inhabitants and may require...
Biosorption sites for lead [Pb (II)] in phanerochaete chrysosporium
Kaya, Levent; Özcengiz, Gülay; Department of Biology (2004)
Biosorption is a phenomenon involving the mechanisms that basically mediate heavy metal tolerance of microorganisms as well as sequestration of heavy metals from environment. Different classes of microorganisms have different biosorption capacities, as a result of the differences in composition and types of functional groups found on cell surfaces. The present study was undertaken to identify the molecular mechanisms for lead [Pb(II)] biosorption in the white-rot fungus, Phanerochaete chrysosporium. The met...
Biohydrogen production in an outdoor panel photobioreactor on dark fermentation effluent of molasses
Avcioglu, Sevler Gokce; Ozgur, Ebru; Eroglu, Inci; Yucel, Meral; Gündüz, Ufuk (2011-08-01)
Hydrogen is regarded as an ideal energy carrier if it is produced from renewable resources such as biomass. Sequential operation of dark and photofermentation allows a highly efficient production of hydrogen from biomass, as maximal conversion of the energy in the carbohydrates to hydrogen can be achieved. In this study photofermentative hydrogen production was carried out in a solar panel photobioreactor by Rhodobacter capsulatus wild type (DSM 1710) and Rhodobacter capsulatus hup(-) (YO3) strain on the mo...
CellTrack: an open-source software for cell tracking and motility analysis
Sacan, Ahmet; Ferhatosmanoglu, Hakan; Coskun, Huseyin (Oxford University Press (OUP), 2008-07-15)
Motivation: Cell motility is a critical part of many important biological processes. Automated and sensitive cell tracking is essential to cell motility studies where the tracking results can be used for diagnostic or curative decisions and where mathematical models can be developed to deepen our understanding of the mechanisms underlying cell motility.
Citation Formats
J. Li and S. S. Sengor, “Biogeochemical cycling of heavy metals in lake sediments: impact of multispecies diffusion and electrostatic effects,” COMPUTATIONAL GEOSCIENCES, pp. 1463–1482, 2020, Accessed: 00, 2020. [Online]. Available: