Organic Matter Degradation in Energy-Limited Subsurface Environments—A Bioenergetics-Informed Modeling Approach

Bajracharya, B. M.; Smeaton, Christina M.; Markelov, Igor; Markelova, Ekaterina; Lu, Chuanhe; Cirpka, Olaf A.; Cappellen, Philippe Van

doi:10.1080/01490451.2021.1998256

Cited by 6 publications

(5 citation statements)

References 84 publications

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“…Depending upon the burial time, the degradation of DOM in the subsurface was kinetically formulated and fitted to the overall electron flow . Under such conditions, microbial metabolism posed a thermodynamic threshold on the electron terminal acceptor processes by devoting a portion of catabolic energy to biomass synthesis . This led us to consider the geomicrobial processes by integrating the anabolic reaction with the electron terminal acceptor reaction (e.g., Fe(III) reduction) to form the full metabolic reaction .…”

Section: Methodsmentioning

confidence: 99%

“…25 Under such conditions, microbial metabolism posed a thermodynamic threshold on the electron terminal acceptor processes by devoting a portion of catabolic energy to biomass synthesis. 23 This led us to consider the geomicrobial processes by integrating the anabolic reaction with the electron terminal acceptor reaction (e.g., Fe(III) reduction) to form the full metabolic reaction. 39 The corresponding Gibbs energy of metabolism (ΔG met ) was then calculated and used in the model runs.…”

Section: Bioenergetics-informed Modelingmentioning

confidence: 99%

“…In particular, the relatively low-energy subsurface engenders the bioutilization of organic carbon to be the thermodynamic constraint in redox zonation. 22,23 The preferability and extent of DOM degradation may not only determine the amount of I being released and reassimilated but also affect the secondary precipitation of I. 8,24 Changes in the reactivity and solubility of Fe oxides alter electron shunting as well as the formation of secondary Fe(II) minerals that contribute to I reimmobilization.…”

Section: Introductionmentioning

confidence: 99%

“…The depositional environment, for instance, can affect the burial history of sediments as well as the availability and reactivity of DOM and Fe oxides. , Within the overall reaction scheme aforementioned, a variety of hydrogeochemical and biogeochemical parameters (e.g., pH and redox potential) potentially alter the groundwater I concentration. In particular, the relatively low-energy subsurface engenders the bioutilization of organic carbon to be the thermodynamic constraint in redox zonation. , The preferability and extent of DOM degradation may not only determine the amount of I being released and reassimilated but also affect the secondary precipitation of I. , Changes in the reactivity and solubility of Fe oxides alter electron shunting as well as the formation of secondary Fe(II) minerals that contribute to I reimmobilization. , The materialized comprehension of I variability therefore calls for a bioenergetics-based interpretation of the redox processes involved in electron transfer and I mobilization.…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

Xie

et al. 2022

Environ. Sci. Technol.

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The genesis of geogenic iodine (I)-contaminated groundwater poses a significant threat to long-term water exploitation. Safe and sustainable water supply, particularly in the northern arid basins, demands a quantitative prediction of the high variability of I distribution over hydrogeological timescales. Here, bioenergetics-informed reactive transport modeling was combined with high-resolution molecular characterization of fueling organic matter to decipher the time-controlled interactions between vertical flow and (bio)geochemical processes in I transport within the Datong aquifers. The declining reactivities of I-bearing organic matter and Fe oxides in the 15−40 m depth decreased the rate of I release, while a growing number of pore volumes flushed through the aquifers to leach out I − and organic I. This removal effect is compensated by the desorption of I − from Fe oxides and secondary FeS generated from the concurrent reduction of Fe oxides and SO 4 2− . Consequently, peak concentrations of groundwater I − may have appeared, depending upon the vertical recharge rate, at the first several pore volumes flushed through the aquifers. The current vertical distributions of the various I species likely represent a quasisteady state between I mobilization and leaching. These new mechanistic insights into the dynamic hydrogeological− (bio)geochemical processes support secure groundwater use in the I-affected northern arid basins.

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Section: Methodsmentioning

confidence: 99%

Section: Bioenergetics-informed Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

Xie

et al. 2022

Environ. Sci. Technol.

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“…[ 156 ] Aerobic microorganisms are energetically favored over anaerobes that rely on electron acceptors other than molecular oxygen for their energy production, which, in turn, determines how much extracellular enzymes a cell can synthesize and release into its surroundings. [ 157 ] Hence, microbially mediated microplastic degradation is likely to be increasingly limited by decreasing cellular energy yields as conditions become increasingly reduced. In addition, changing redox conditions in natural environments are accompanied by changes in pH, geochemical conditions, and biotic activity that can all alter the surface chemistry, physical properties, and accessibility of microplastics.…”

Section: Degradation In the Environmentmentioning

confidence: 99%

Catalytic and biocatalytic degradation of microplastics

Zandieh,

Griffiths,

Waldie

et al. 2023

Exploration

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In recent years, there has been a surge in annual plastic production, which has contributed to growing environmental challenges, particularly in the form of microplastics. Effective management of plastic and microplastic waste has become a critical concern, necessitating innovative strategies to address its impact on ecosystems and human health. In this context, catalytic degradation of microplastics emerges as a pivotal approach that holds significant promise for mitigating the persistent effects of plastic pollution. In this article, we critically explored the current state of catalytic degradation of microplastics and discussed the definition of degradation, characterization methods for degradation products, and the criteria for standard sample preparation. Moreover, the significance and effectiveness of various catalytic entities, including enzymes, transition metal ions (for the Fenton reaction), nanozymes, and microorganisms are summarized. Finally, a few key issues and future perspectives regarding the catalytic degradation of microplastics are proposed.

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Assessing energy fluxes and carbon use in soil as controlled by microbial activity - A thermodynamic perspective A perspective paper

Kästner,

Maskow,

Miltner

et al. 2024

Soil Biology and Biochemistry

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Organic Matter Degradation in Energy-Limited Subsurface Environments—A Bioenergetics-Informed Modeling Approach

Cited by 6 publications

References 84 publications

Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

Catalytic and biocatalytic degradation of microplastics

Assessing energy fluxes and carbon use in soil as controlled by microbial activity - A thermodynamic perspective A perspective paper

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