Natural attenuation of chlorinated ethenes in hyporheic zones: a review of key biogeochemical processes and in-situ transformation potential

John J. Weatherill, Siavash Atashgahi, Uwe Schneidewind, Stefan Krause, Sami Ullah, Nigel Cassidy, Michael O. Rivett

Research output: Contribution to journalLiterature review

15 Citations (Scopus)

Abstract

Chlorinated ethenes (CEs) are legacy contaminants whose chemical footprint is expected to persist in aquifers around the world for many decades to come. These organohalides have been reported in river systems with concerning prevalence and are thought to be significant chemical stressors in urban water ecosystems. The aquifer-river interface (known as the hyporheic zone) is a critical pathway for CE discharge to surface water bodies in groundwater baseflow. This pore water system may represent a natural bioreactor where anoxic and oxic biotransformation process act in synergy to reduce or even eliminate contaminant fluxes to surface water. Here, we critically review current process understanding of anaerobic CE respiration in the competitive framework of hyporheic zone biogeochemical cycling fuelled by in-situ fermentation of natural organic matter. We conceptualise anoxic-oxic interface development for metabolic and co-metabolic mineralisation by a range of aerobic bacteria with a focus on vinyl chloride degradation pathways. The superimposition of microbial metabolic processes occurring in sediment biofilms and bulk solute transport delivering reactants produces a scale dependence in contaminant transformation rates. Process interpretation is often confounded by the natural geological heterogeneity typical of most riverbed environments. We discuss insights from recent field experience of CE plumes discharging to surface water and present a range of practical monitoring technologies which address this inherent complexity at different spatial scales. Future research must address key dynamics which link supply of limiting reactants, residence times and microbial ecophysiology to better understand the natural attenuation capacity of hyporheic systems.
LanguageEnglish
Pages362-382
Number of pages21
JournalWater Research
Volume128
Early online date30 Oct 2017
DOIs
Publication statusPublished - 1 Jan 2018

Fingerprint

Natural attenuation
hyporheic zone
natural attenuation
Surface waters
ethylene
Impurities
Aquifers
Rivers
surface water
Aerobic bacteria
pollutant
Solute transport
Biofilms
aquifer
Bioreactors
Biological materials
ecophysiology
Fermentation
Ecosystems
Water

Keywords

  • chlorinated ethenes
  • hyporheic zone
  • natural attenuation
  • biogeochemistry
  • biotransformation
  • heterogeneity

Cite this

Weatherill, John J. ; Atashgahi, Siavash ; Schneidewind, Uwe ; Krause, Stefan ; Ullah, Sami ; Cassidy, Nigel ; Rivett, Michael O. / Natural attenuation of chlorinated ethenes in hyporheic zones : a review of key biogeochemical processes and in-situ transformation potential. In: Water Research. 2018 ; Vol. 128. pp. 362-382.
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Natural attenuation of chlorinated ethenes in hyporheic zones : a review of key biogeochemical processes and in-situ transformation potential. / Weatherill, John J.; Atashgahi, Siavash; Schneidewind, Uwe; Krause, Stefan; Ullah, Sami; Cassidy, Nigel; Rivett, Michael O.

In: Water Research, Vol. 128, 01.01.2018, p. 362-382.

Research output: Contribution to journalLiterature review

TY - JOUR

T1 - Natural attenuation of chlorinated ethenes in hyporheic zones

T2 - Water Research

AU - Weatherill, John J.

AU - Atashgahi, Siavash

AU - Schneidewind, Uwe

AU - Krause, Stefan

AU - Ullah, Sami

AU - Cassidy, Nigel

AU - Rivett, Michael O.

PY - 2018/1/1

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N2 - Chlorinated ethenes (CEs) are legacy contaminants whose chemical footprint is expected to persist in aquifers around the world for many decades to come. These organohalides have been reported in river systems with concerning prevalence and are thought to be significant chemical stressors in urban water ecosystems. The aquifer-river interface (known as the hyporheic zone) is a critical pathway for CE discharge to surface water bodies in groundwater baseflow. This pore water system may represent a natural bioreactor where anoxic and oxic biotransformation process act in synergy to reduce or even eliminate contaminant fluxes to surface water. Here, we critically review current process understanding of anaerobic CE respiration in the competitive framework of hyporheic zone biogeochemical cycling fuelled by in-situ fermentation of natural organic matter. We conceptualise anoxic-oxic interface development for metabolic and co-metabolic mineralisation by a range of aerobic bacteria with a focus on vinyl chloride degradation pathways. The superimposition of microbial metabolic processes occurring in sediment biofilms and bulk solute transport delivering reactants produces a scale dependence in contaminant transformation rates. Process interpretation is often confounded by the natural geological heterogeneity typical of most riverbed environments. We discuss insights from recent field experience of CE plumes discharging to surface water and present a range of practical monitoring technologies which address this inherent complexity at different spatial scales. Future research must address key dynamics which link supply of limiting reactants, residence times and microbial ecophysiology to better understand the natural attenuation capacity of hyporheic systems.

AB - Chlorinated ethenes (CEs) are legacy contaminants whose chemical footprint is expected to persist in aquifers around the world for many decades to come. These organohalides have been reported in river systems with concerning prevalence and are thought to be significant chemical stressors in urban water ecosystems. The aquifer-river interface (known as the hyporheic zone) is a critical pathway for CE discharge to surface water bodies in groundwater baseflow. This pore water system may represent a natural bioreactor where anoxic and oxic biotransformation process act in synergy to reduce or even eliminate contaminant fluxes to surface water. Here, we critically review current process understanding of anaerobic CE respiration in the competitive framework of hyporheic zone biogeochemical cycling fuelled by in-situ fermentation of natural organic matter. We conceptualise anoxic-oxic interface development for metabolic and co-metabolic mineralisation by a range of aerobic bacteria with a focus on vinyl chloride degradation pathways. The superimposition of microbial metabolic processes occurring in sediment biofilms and bulk solute transport delivering reactants produces a scale dependence in contaminant transformation rates. Process interpretation is often confounded by the natural geological heterogeneity typical of most riverbed environments. We discuss insights from recent field experience of CE plumes discharging to surface water and present a range of practical monitoring technologies which address this inherent complexity at different spatial scales. Future research must address key dynamics which link supply of limiting reactants, residence times and microbial ecophysiology to better understand the natural attenuation capacity of hyporheic systems.

KW - chlorinated ethenes

KW - hyporheic zone

KW - natural attenuation

KW - biogeochemistry

KW - biotransformation

KW - heterogeneity

UR - http://www.sciencedirect.com/science/article/pii/S0043135417309028

U2 - 10.1016/j.watres.2017.10.059

DO - 10.1016/j.watres.2017.10.059

M3 - Literature review

VL - 128

SP - 362

EP - 382

JO - Water Research

JF - Water Research

SN - 0043-1354

ER -