Nitrate removal in riparian wetland soils: Effects of flow rate, temperature, nitrate concentration and soil depth

Willems, Hans P. L.; Rotelli, Matthew; Berry, Duane F.; Smith, Eric P.; Reneau, R. B.; Mostaghimi, Saied

doi:10.1016/s0043-1354(96)00315-6

Cited by 63 publications

(59 citation statements)

References 17 publications

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“…This sudden drop of DIN was also found in other studies (e.g. Dorge 1994;Gross et al 1995;Lowrance et al 1995;Hill 1996;Hessen et al 1997;Martin and Reddy 1997;Willems et al 1997). These studies and a review on nitrogen retention (Altman and Parizek 1995) showed that nitrate was removed from groundwater through denitrification in riparian zones and wetlands.…”

supporting

confidence: 78%

Is Nutrient Contamination of Groundwater Causing Eutrophication of Groundwater-Fed Meadows?

et al. 2005

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There is an ongoing debate as to whether nutrient contamination of groundwater under agricultural fields may cause nutrient-enrichment and subsequent eutrophication in discharge areas. Often, there is only circumstantial evidence to support this supposition (proximity of agricultural fields, direction of water flow, highly productive vegetation). Research on solute transport along a flow path is necessary to evaluate the risk for eutrophication. In this paper we present results of such a study. Two transects were established in a discharge meadow, a few meters downstream from fertilized cornfields. Highly productive vegetation in parts of the meadow suggested nutrient-enrichment caused by inflow of contaminated groundwater. This supposition was supported by an analysis of groundwater flow paths, residence times and chloride as tracer for pollution. However, the fate of nutrients along the flow path indicated otherwise. While we found high concentrations of DIN (dissolved inorganic nitrogen), P and K under the cornfields, DIN and P concentrations drop below detection limit when groundwater enters the meadow. Only K progressed into the meadow but did not enter the root zone. We conclude that (1) polluted groundwater from the cornfields did not cause the nutrientenrichment, as indicated by the highly productive vegetation. Restoration projects in discharge areas should not focus upon measures in upstream areas if only circumstantial evidence is available. Solute transport should be considered as well. (2) Because K clearly showed to be the most mobile nutrient, its importance for nutrientenrichment in discharge wetlands merits more attention in future research.

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supporting

confidence: 78%

Is Nutrient Contamination of Groundwater Causing Eutrophication of Groundwater-Fed Meadows?

et al. 2005

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“…The volatilization of NH 4 -N was negligible due to the relatively low pH for water samples of the influent and effluent at different soil depths. The measured pH of water samples was around 8 while the NH 4 -N volatilization generally took place at a pH value above 9.4 [45]. The adsorbed NH 4 -N ultimately converted to NO 3 -N via the nitrification for a long-term reactor.…”

Section: Nitrogen Removalmentioning

confidence: 96%

Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions

Pan

Xiong

Huang

2017

Water

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Abstract:Reclaimed water is an important supplementary source for fresh water. Purification is necessary prior to utilization in order to minimize the pollution and human-health risk. A three-year experiment was carried out to study the removal of nitrogen and organics through a simulated soil aquifer treatment (SAT) system under continuous wetting and wetting/drying conditions. The removal performance of nitrogen and chemical oxygen demand (COD) was improved in the wetting/drying column. The average removal efficiencies of the three years were 51% and 78% for the NO 3 -N, 41% and 51% for the NH 4 -N, and 40% and 50% for the COD in the continuous wetting and wetting/drying columns. Nitrogen and COD removal mainly took place within the top 20 cm of the columns, which was highly correlated with the distribution of microorganisms. The amount of microorganisms was also positively correlated with the content of organic matter and dissolved oxygen (DO) in both soil columns. NO 3 -N can be removed effectively via aerobic denitrifying bacteria as the DO concentration was 3-6 mg/L. DO and NO 3 -N were simultaneously reduced as the electron acceptors for COD degradation, and DO only accounted for 40% of total electron acceptor in COD degradation for the continuous wetting column. Nitrogen and COD can be effectively and steadily removed from reclaimed water during the long-term operation of a SAT system.

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“…The percentage of NO 3 -removed at 5°C was surprisingly high with some values reaching up to 88 % removal. The response of the sediment communities to the low temperature is confounding and contrary to established understanding of how increasing temperature accelerates denitrification rates (Dawson & Murphy, 1972;Willems et al, 1997).…”

Section: Interactions Of Temperature Initial No 3 -Concentrations Amentioning

confidence: 93%

“…Many studies have previously investigated the fate of NO 3 -in sediment cores and in aquatic environments under a variety of conditions (Willems et al, 1997;Piña-Ochoa & Álvarez-Cobelas, 2006;Seitzinger et al, 2006;Gu et al, 2007). These studies have established a well-documented baseline for how NO 3 -behaves under varying temperature, NO 3 -concentration, and pore water velocities.…”

Section: Interactions Of Temperature Initial No 3 -Concentrations Amentioning

confidence: 99%

“…The Q 10 value for the denitrification rate in these columns was, on average, 2.55 for 15°C to 25°C. Most Q 10 values fall between 1.8 and 6 for denitrification (Malhi et al, 1990;Ambus, 1993;Willems et al, 1997), Per Ambus [1993 found very similar Q 10 values in saturated riparian soil of 2.53 and 2.71 for temperature steps 12°C to 22°C and 2°C to 12°C…”

Section: Interactions Of Temperature Initial No 3 -Concentrations Amentioning

confidence: 99%

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N2O Production and Removal in Streambed Sediments: Understanding Physicochemical Influences on N2O Fluxes From Agricultural Streams on the Eastern Shore of Virginia

Dunckel¹

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Nitrate removal in riparian wetland soils: Effects of flow rate, temperature, nitrate concentration and soil depth

Cited by 63 publications

References 17 publications

Is Nutrient Contamination of Groundwater Causing Eutrophication of Groundwater-Fed Meadows?

Is Nutrient Contamination of Groundwater Causing Eutrophication of Groundwater-Fed Meadows?

Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions

N2O Production and Removal in Streambed Sediments: Understanding Physicochemical Influences on N2O Fluxes From Agricultural Streams on the Eastern Shore of Virginia

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