Hydraulic constraints on the performance of a groundwater denitrification wall for nitrate removal from shallow groundwater

Schipper, Louis A.; Barkle, G. F.; Hadfield, John; Vojvodić-Vuković, Maja; Burgess, Craig

doi:10.1016/s0169-7722(03)00157-8

Cited by 83 publications

(71 citation statements)

References 13 publications

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“…These reactive materials were selected as substrates for the growth of denitrifying bacteria in a field-scale barrier system (Herbert and Björnström, 2009); other denitrification studies have shown that sawdust is a suitable substrate (e.g. Robertson et al, 2008;Schipper et al, 2004), providing a long-term carbon source for the growth of heterotrophic denitrifying bacteria. The sewage sludge is included because it is a source of denitrifying bacteria and allows for the rapid establishment of a denitrifying community in the columns.…”

Section: Column Experimentsmentioning

confidence: 99%

“…chlorinated solvents, nitrate), reactive materials generally consist of electron donor sources such as zerovalent iron (Fe 0 ) or organic carbon (Blowes et al, 2000). Organic substrates have been chosen in a variety of cases (Benner et al, 2002;Blowes et al, 1994;Robertson et al, 2008;Schipper et al, 2004) where carbon sources are required for heterotrophic microbial reduction of groundwater constituents (e.g. dissimilatory sulfate reduction, denitrification).…”

Section: Introductionmentioning

confidence: 99%

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Implications of non-equilibrium transport in heterogeneous reactive barrier systems: Evidence from laboratory denitrification experiments

Herbert

2011

Journal of Contaminant Hydrology

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Organic substrates in reactive barrier systems are often heterogeneous material mixtures with relatively large contrasts in hydraulic conductivity and porosity over short distances. These short-range variations in material properties imply that preferential flow paths and diffusion between regions of higher and lower hydraulic conductivity may be important for treatment efficiency. This paper presents the results of a laboratory column experiment where denitrification is investigated using a heterogeneous reactive substrate (sawdust mixed with sewage sludge). Displacement experiments with a non-reactive solute at three different flow rates are used to estimate transport parameters using a dual porosity non-equilibrium model.

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Section: Column Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Implications of non-equilibrium transport in heterogeneous reactive barrier systems: Evidence from laboratory denitrification experiments

Herbert

2011

Journal of Contaminant Hydrology

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“…Thus, the fast flow velocity due to the steeper slope of the T2 site could prevent NO 3 -and OM in the water from reaching the sediments, so that the NO 3 -easily flows downstream. Schipper and his colleague's (Schipper et al 2004(Schipper et al , 2005(Schipper et al , 2010 research demonstrated that sediment denitrification rates increased when the water flow rate or hydraulic conductivity was low. This relationship emphasizes the importance of slow NO 3 -and OM diffusion through the immobile fraction where denitrification occurs.…”

Section: Discussionmentioning

confidence: 99%

Factors Controlling Sediment Denitrification Rates in Grassland and Forest Streams

Kim¹

2014

Terr. Atmos. Ocean. Sci.

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Sediment denitrification is an important nitrate (NO 3 -) removal process from agricultural streams. The direct and indirect factors that control denitrification rates in tributary sediments can vary depending on the types of agricultural activities and vegetation. Our research investigated (1) tributary sediment denitrification rates in a grassland stream affected by pasture ecosystems and a forest stream affected by N fertilization; and (2) the environmental factors that determine denitrification rates in tributary sediments. The denitrification enzyme activity (DEA) in grassland stream sediments is positively correlated with precipitation likely due to the increased nutrient exchange rates between stream water and sediments, and was higher than in forest stream sediments, leading to a decrease in NO 3 -concentration ([NO 3 -]) in stream sediments. The DEA in riparian sediments was regulated by carbon concentrations and did not contribute to NO 3 -removal from the riparian sediment in grassland and forest streams. Thus, environmental factors affected by different types of agricultural activities and vegetation might regulate denitrification rates and in agricultural stream ecosystems.

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“…Therefore, the efficiency of surface systems for treatment may be reduced because substantial amounts of contaminated water may bypass the active treatment zone. To address this limitation, subsurface systems such as in-situ bioreactors, permeable reactive barriers, biofilters, and subsurface flow constructed wetlands have been investigated (Bezbaruh and Zhang, 2003;Darbi et al, 2003;Greenan et al, 2006;Robertson et al, 2007;Schipper and Vojvodic-Vakovic, 2000;Schipper and Vojvodic-Vakovic, 2001;Schipper et al, 2004;Su and Puls, 2007;van Driel et al, 2006). These subsurface systems generally depend on microbial denitrification to mineralize and remove nitrate.…”

Section: )mentioning

confidence: 99%

Recycling Vertical-Flow Biofilter: A Treatment System for Agricultural Subsurface Tile Water

Baker¹,

Clark²

2012

Irrigation - Water Management, Pollution and Alternative Strategies

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Hydraulic constraints on the performance of a groundwater denitrification wall for nitrate removal from shallow groundwater

Cited by 83 publications

References 13 publications

Implications of non-equilibrium transport in heterogeneous reactive barrier systems: Evidence from laboratory denitrification experiments

Implications of non-equilibrium transport in heterogeneous reactive barrier systems: Evidence from laboratory denitrification experiments

Factors Controlling Sediment Denitrification Rates in Grassland and Forest Streams

Recycling Vertical-Flow Biofilter: A Treatment System for Agricultural Subsurface Tile Water

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