Effects on nitrate leaching of the timing of cattle slurry application to leys

Delin, Sofia; Stenberg, Maria

doi:10.1111/sum.12595

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…The timing of manure application can affect the losses of nutrients. For example, Delin and Stenberg (2020) found that spring application of cattle slurry resulted in lower subsurface leaching losses of NO 3 –N than autumn application. However, in a similar cropping system with undersown ley in spring barley, Turtola and Yli‐Halla (1999) observed higher PO 4 –P concentrations in surface runoff from experimental plots treated with mineral fertilizer and manure compared with unfertilized control plots.…”

Section: Resultsmentioning

confidence: 99%

Nutrient losses over time via surface runoff and subsurface drainage from an agricultural field in northern Sweden

et al. 2022

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Nitrogen (N) and phosphorus (P) losses, via both surface runoff and subsurface drainage water, were monitored in an agricultural field in northern Sweden for 32 yr. The objective was to determine losses of N and P in a long-term perspective in relation to meteorological factors and impacts of agricultural land use, with a focus on relative contributions of surface runoff and subsurface drainage water to N and P losses. In order to collect surface runoff water, an embankment was installed on three sides of the field, and the fourth side had an open ditch that drove runoff water to a measuring station. Subsurface water draining from the field was collected in a fishbone-shaped drainage system that terminated at the measuring station. In 50% of years (16/32), mean annual concentration of total N (TN) was significantly higher in subsurface drainage water than in surface runoff water. An opposing trend was seen for total P (TP), with mean annual concentration being significantly higher in surface runoff water than in subsurface drainage water in all but 3 of the 32 yr monitored.Years with a barley crop had higher TN concentration in subsurface drainage water but no difference in surface runoff compared with years with ley. In contrast, years with barley had lower TN concentration in surface runoff than years with ley, with no difference in TP in subsurface drainage water.

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Section: Resultsmentioning

confidence: 99%

Nutrient losses over time via surface runoff and subsurface drainage from an agricultural field in northern Sweden

et al. 2022

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“…The absence of ammonia removal in the set-up tested in this work can be related to the use of a second static mixer after hydroxide addition, ensuring a better mixing and a correct pH regulation. Although this entails no ammonia removal, it could be considered an advantage since ammonia is better than nitrite for nitrogen fertigation due to less leaching risk (Delin and Stenberg, 2020). With a convenient dose, nitrogen recycling could be achieved, contributing to production sustainability.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Almost complete recovery of the nutrients and suspended organic matter was attained due to the improved settling features of the formed flocs. Hence, the use of an efficient settler to recover the solid formed by continuous coagulation-flocculation from the feedlot wastewaters would allow rapid treatment and eventual development of a solid fertilizer (Ciapparelli et al, 2016), while the clarified water may be used for fertigation (Delin and Stenberg, 2020).…”

Section: Introductionmentioning

confidence: 99%

Simulation and optimization of a lamella settler for cattle feedlot wastewater treatment and nutrients recovery. Experimental validation in the field

Fleite

García

Santos

et al. 2020

Heliyon

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Cattle concentrated animal feeding operations (feedlots), whose number has grown considerably in the last years, generate large volumes of wastewaters with a high organic load. The wastewaters are formed by rainfall-runoff of the accumulated manure and may contain hormones and antibiotics, which hampers the use of biological treatments. In this work, the feasibility of continuous separation of the suspended colloidal organic matter and nutrients to clarify the liquid and recover the solid is studied. A flocculation sedimentation system using a decentralized lamella settler is proposed, optimized and further tested in the field. Computational fluid dynamic (CFD) simulation is used to analyze the motion of the liquid and suspended inertial particles representing the formed flocs, for optimizing the settler. The simulations helped in the design of the bench-scale unit tested in the field. The clarified liquid was characterized to analyze its use for fertigation. The proposed treatment allowed excellent removal of organic matter (~98% chemical oxygen demand, and almost complete turbidity) and phosphorus (~95%). Organic nitrogen was partially removed (~70%) and ammonia nitrogen mostly remained in the liquid. Spectral characterization of the clarified liquid suggests that the remaining organic nitrogen is related to soluble protein-like compounds.

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“…They experimentally evidenced that the use of an efficient settler allows rapid treatment of the wastewater while recovering the nutrients to eventually produce a solid fertilizer and clarified water for fertigation. 8,9 Lamella settlers are quite convenient for large capacities, since they constitute high-rate, low-cost installations. Smaller units are required compared to conventional settlers or sedimentation basins.…”

Section: ■ Introductionmentioning

confidence: 99%

2D Path of a Radioactive Tracer within a Lamellar Settler: Experiments and Modeling

Fleite,

Maestri,

García

et al. 2023

Ind. Eng. Chem. Res.

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Determining and controlling the trajectory of solid flocs in a settler are of paramount importance to ensure the desired solid−liquid separation. This work evinces the feasibility of determining the motion of solid particles in a lamellar settler by using radioactive particle tracking and extracting relevant dynamic information from an approximate two-dimensional (2D) reconstruction. The experimental procedure involves simultaneously scanning different regions of the settler with scintillation detectors located at a given distance from the examined vessel while a radioactive tracer particle is freely moving inside. The complete reconstruction considers the system geometry, the attenuation of the medium (water), the activity of the radioactive tracer, and the efficiency of the detectors, determined by calibration. The approximate reconstruction considers that the detectors located closer to the tracer are the ones that record the largest number of counts. Then, searching for the detector with the highest number of counts and considering the ratio of the intensity measured by the closest ones, an approximate tracer axial bidimensional location is estimated. Compared to the results given by the radioactive particle tracking (RPT) technique, although the information extracted is more limited, the approximate experimental procedure has the advantage of not requiring a calibration stage, which could be complex for systems with varying solid holdup. Analysis of the particles' trajectories obtained with this methodology can be quite useful to assess a proper design of the settler. For instance, the upper limit of the working flow rate and the mean residence time of the flocs before settling can be determined. The particle motion is simulated with a volume-of-fluid (VOF) method implemented in Gerris open-access software, and compared to the experimental results.

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Effects on nitrate leaching of the timing of cattle slurry application to leys

Cited by 10 publications

References 27 publications

Nutrient losses over time via surface runoff and subsurface drainage from an agricultural field in northern Sweden

Nutrient losses over time via surface runoff and subsurface drainage from an agricultural field in northern Sweden

Simulation and optimization of a lamella settler for cattle feedlot wastewater treatment and nutrients recovery. Experimental validation in the field

2D Path of a Radioactive Tracer within a Lamellar Settler: Experiments and Modeling

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