Non-Darcy flow of water through woodchip media

Ghane, Ehsan; Fausey, Norman R.; Brown, L. C.

doi:10.1016/j.jhydrol.2014.09.065

Cited by 56 publications

(40 citation statements)

References 29 publications

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“…These values are not dissimilar to the range of 2.5 to 5.5 cm s −1 that Chun et al (2009Chun et al ( , 2010 obtained from the analysis of breakthrough curves from laboratory-scale and field-scale bioreactors in Illinois or to values of 8.4 and 2.4 cm s −1 reported by Ghane et al (2014) for fresh and old woodchips, respectively. The reduction of the slope at higher hydraulic gradients is consistent with the deviation from Darcian flow reported by Ghane et al (2014).…”

Section: Flow Analysissupporting

confidence: 51%

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Temperature and Substrate Control Woodchip Bioreactor Performance in Reducing Tile Nitrate Loads in East-Central Illinois

et al. 2016

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Tile drainage is the major source of nitrate in the upper Midwest, and end-of-tile removal techniques such as wood chip bioreactors have been installed that allow current farming practices to continue, with nitrate removed through denitrification. There have been few multiyear studies of bioreactors examining controls on nitrate removal rates. We evaluated the nitrate removal performance of two wood chip bioreactors during the first 3 yr of operation and examined the major factors that regulated nitrate removal. Bioreactor 2 was subject to river flooding, and performance was not assessed. ) in Years 2 and 3, overall removal efficiency was low (3 and 7% in Years 2 and 3, respectively). Based on a process-based bioreactor performance model, Bioreactor 1 would have needed to be 9 times as large as the current system to remove 50% of the nitrate load from this 20-ha field. et al., 2010b;Skaggs et al., 2012;Jaynes and Isenhart, 2014;David et al., 2015;Groh et al., 2015). The effectiveness of these practices is variable from location to location and temporally due to differing tile flow amounts and nitrate concentrations. Edgeof-field techniques have particular difficulty reducing nitrate loads during high-flow periods, when most transport occurs (Royer et al., 2006;Ikenberry et al., 2014;Moorman et al., 2015).Wood chip bioreactors have been installed at the end of tile lines from many fields in the Midwest. A wide range of nitrate removal effectiveness (up to 98% nitrate reductions) in laboratory and field studies has been reported in the literature (Greenan et al., 2009;Chun et al., 2009Chun et al., , 2010Moorman et al., 2010;Verma et al., 2010;Woli et al., 2010;Christianson et al., 2012b;Bell et al., 2015). Most have been designed as plasticlined trenches, filled with mixed-species wood chips, that receive tile flow from fields ranging from 1 to 20 ha in size (e.g., Woli et al., 2010;Christianson et al., 2012b). At low flow most of the tile water passes through the bioreactor, but at high flows they are designed so that water will bypass the wood chip bed (Christianson et al., 2012a). The published literature on the effectiveness of this technique is limited, and additional results are needed because bioreactors have been proposed in two state nutrient loss reduction strategies as a primary method for nitrate reductions (Iowa Nutrient Reduction Strategy, 2013; Illinois Nutrient Loss Reduction Strategy, 2015).One concern with any engineered denitrification technique is that nitrous oxide (N 2 O) could be released (Groh et al., 2015), trading a water quality problem for a greenhouse gas problem Journal of Environmental Quality MOVING DENITRIFYING BIOREACTORS BEYOND PROOF OF CONCEPT SPECIAL SECTION Core Ideas• Bioreactor performance decreased greatly after Year 1.• Tile water temperature was limiting factor as wood chips aged.• Little N 2 O emitted from wood chip bed.• Bioreactor would need to be six times larger for this field and nitrate load.

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Section: Flow Analysissupporting

confidence: 51%

“…The highest hydraulic gradient in the bioreactor during 2013 was approximately 0.026. Ghane et al (2014) found this value to be the upper limit for Darcian flow in fresh woodchips.…”

Section: Flow Analysismentioning

confidence: 85%

Temperature and Substrate Control Woodchip Bioreactor Performance in Reducing Tile Nitrate Loads in East-Central Illinois

et al. 2016

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“…[24,25]. At sufficiently low , this calculation yields the well-known "cubic law" [26,27] and "Darcy's law" [28,29].…”

Section: Introductionmentioning

confidence: 78%

Effects of Hydraulic Gradient, Intersecting Angle, Aperture, and Fracture Length on the Nonlinearity of Fluid Flow in Smooth Intersecting Fractures: An Experimental Investigation

Fan

Zhao

2018

Geofluids

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This study experimentally investigated the nonlinearity of fluid flow in smooth intersecting fractures with a high Reynolds number and high hydraulic gradient. A series of fluid flow tests were conducted on one-inlet-two-outlet fracture patterns with a single intersection. During the experimental tests, the syringe pressure gradient was controlled and varied within the range of 0.20-1.80 MPa/m. Since the syringe pump used in the tests provided a stable flow rate for each hydraulic gradient, the effects of hydraulic gradient, intersecting angle, aperture, and fracture length on the nonlinearities of fluid flow have been analysed for both effluent fractures. The results showed that as the hydraulic gradient or aperture increases, the nonlinearities of fluid flow in both the effluent fractures and the influent fracture increase. However, the nonlinearity of fluid flow in one effluent fracture decreased with increasing intersecting angle or increasing fracture length, as the nonlinearity of fluid flow in the other effluent fracture simultaneously increased. In addition, the nonlinearities of fluid flow in each of the effluent fractures exceed that of the influent fracture.

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“…The REV of the Darcy and non-Darcy flow is compared. Some new understandings have been The inconsistency between the REVs mainly results from the REV of the non-Darcy flow determined by non-Darcy coefficient , and the REV of the Darcy flow is determined by inherent permeability , when the non-Darcy coefficient of porous media is considered to be only related to intrinsic permeability [49][50][51]. Then the REV determined by nonDarcy coefficient and the REV determined by inherent permeability should be consistent, but more studies have shown that the non-Darcy coefficient is not only related to the intrinsic permeability of media.…”

Section: Discussionmentioning

confidence: 99%

Study on the REV Size of Fractured Rock in the Non-Darcy Flow Based on the Dual-Porosity Model

2018

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Non-Darcy flow of water through woodchip media

Cited by 56 publications

References 29 publications

Temperature and Substrate Control Woodchip Bioreactor Performance in Reducing Tile Nitrate Loads in East-Central Illinois

Temperature and Substrate Control Woodchip Bioreactor Performance in Reducing Tile Nitrate Loads in East-Central Illinois

Effects of Hydraulic Gradient, Intersecting Angle, Aperture, and Fracture Length on the Nonlinearity of Fluid Flow in Smooth Intersecting Fractures: An Experimental Investigation

Study on the REV Size of Fractured Rock in the Non-Darcy Flow Based on the Dual-Porosity Model

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