Nitrate removal mechanism in riparian groundwater in an intensified agricultural catchment

Xie, Zheyu; Zhang, Yujing; Zhang, Zhenyu; Huang, Jinliang

doi:10.1016/j.agwat.2023.108223

Cited by 8 publications

(2 citation statements)

References 42 publications

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“…Riparian wetlands serve as a zone of transition between aquatic and terrestrial environments [8][9][10]. As runoff and SGW generally flow through riparian zones before entering SW, Land 2024, 13, 409 2 of 23 these areas typically function as buffer zones for reducing nutrient concentrations, including total nitrogen (total_N) in SW and SGW [1,[11][12][13][14][15]. Total_N includes nitrate (NO 3 -N), nitrite (NO 2 -N), ammonium (NH 4 -N), and organic N [5,15], among which NO 3 -N is typically of greatest concern due to its high mobility and susceptibility to leaching [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, in a study investigating a riparian wetland in Maryland, Jordan et al [23] showed that riparian zones did not effectively remove SGW PO 4 3 -P inputs from adjacent agricultural activities. Many recent studies have concluded that the SW and SGW nutrient dynamics of a riparian wetland depend on several factors, including catchment land-use activities and flow paths [13,14,16,25]. For example, Kwon et al [16] highlighted elevated P levels in SGW within riparian zones adjacent to paddy fields, establishing SGW discharge into SW as the principal source of P in the stream.…”

Section: Introductionmentioning

confidence: 99%

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Surface Water (SW) and Shallow Groundwater (SGW) Nutrient Concentrations in Riparian Wetlands of a Mixed Land-Use Catchment

Abesh,

Anderson,

Hubbart

2024

Land

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Precipitation patterns, water flow direction, and local land-use practices affect surface water (SW) and shallow groundwater (SGW) nutrient concentrations in riparian wetlands. Given physical process complexities, spatiotemporal quantification of nutrients and physical factors influencing nutrient concentrations are needed to advance wetland water resource management. To address these needs, a study was conducted in riparian wetlands of a mixed land-use catchment in West Virginia (WV), USA. Observed data included SW–SGW levels and nutrient concentrations, including nitrate (NO3-N), nitrite (NO2-N), ammonium (NH4-N), orthophosphate (PO43-P), total nitrogen (total_N), and total phosphorus (total_P) from January 2020 to December 2021. Water samples were collected monthly from stream gauge sites (n = 4) and co-located piezometers (n = 13). Results showed that, on average, gaining stream conditions were observed in upstream sites, and losing stream conditions were observed in downstream sites. Observed nutrient profiles between SW and SGW included SW exhibiting a higher average NO3-N concentration (0.42 mg/L), while SGW displayed an elevated NH4-N concentration (1.55 mg/L) relative to other nitrogen species. Significantly high (p < 0.05) SW NO3- concentrations in summer and fall were attributed to increased precipitation and corresponding water level and, therefore, pressure head and transport fluctuations. Principal Component Analysis (PCA) showed differences in nutrient concentrations based on the water source type and catchment land use, explaining 65% of data variability. Spearman correlation analysis illustrated the correlation among nutrient concentrations, land use, and water level changes in SW and SGW environments. This study provides needed baseline data on nutrient dynamics for a riparian wetland in a mixed land-use catchment, supplying science-based information to advance land and water management practices in the study watershed and similar physiographic watersheds globally.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Water (SW) and Shallow Groundwater (SGW) Nutrient Concentrations in Riparian Wetlands of a Mixed Land-Use Catchment

Abesh,

Anderson,

Hubbart

2024

Land

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Feasibility of nitrate adsorption from aqueous solution by nitrogen and oxygen-modified pine bark biochar: experimental and computational approach

Kasera,

Gillikin,

Kolar

et al. 2023

Discov Water

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Efficient and economical wastewater treatment has presented itself as a global challenge. In this context, adsorption is one of the most effective methods to remove contaminants from wastewater. The present study evaluated the feasibility of chemically modified pine bark biochar’s nitrate adsorption ability. Pine bark biochar was modified with urea and sulfuric acid to remove nitrate from an aqueous solution. The physicochemical properties of the biochar samples, such as pH, pH at point of zero charges, surface atomic composition, surface morphology, and surface area, were evaluated. The equilibrium adsorption data were fitted to the Langmuir and Freundlich isotherm models. The kinetic data were fitted to different kinetic models (pseudo-first order, pseudo-second order, intraparticle diffusion, and Elovich). The adsorption data fitted well with the Langmuir and pseudo-first order models. The maximum nitrate adsorption capacity was found to be 1.548 mg g−1. Mass transfer studies were conducted to identify the rate-limiting step, values of the external mass transfer coefficient, and diffusion coefficient in the nitrate adsorption process by the modified biochar. The external mass transfer coefficients were in the range of 2.2 × 10–11–2.86 × 10–10 m s−1. The intraparticle diffusion coefficient ranged from 6.53 × 10–10 to 1.78 × 10–9 m2 s−1. The Biot number value less than 100 indicated that the adsorption was controlled by film diffusion. Interaction energies between nitrate ions and model biochar structures were calculated DFT-based quantum chemical software (Gaussian). The positive interaction energy values (2.3485–2.485 eV) suggested nitrate adsorption on model biochar structures was thermodynamically not feasible. Graphical Abstract

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Nutrient removal performance from agricultural drainage by strengthening ecological ditches in hilly areas

Zhang,

Yan,

et al. 2024

Agricultural Water Management

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Nitrate removal mechanism in riparian groundwater in an intensified agricultural catchment

Cited by 8 publications

References 42 publications

Surface Water (SW) and Shallow Groundwater (SGW) Nutrient Concentrations in Riparian Wetlands of a Mixed Land-Use Catchment

Surface Water (SW) and Shallow Groundwater (SGW) Nutrient Concentrations in Riparian Wetlands of a Mixed Land-Use Catchment

Feasibility of nitrate adsorption from aqueous solution by nitrogen and oxygen-modified pine bark biochar: experimental and computational approach

Nutrient removal performance from agricultural drainage by strengthening ecological ditches in hilly areas

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