Modelling of phosphate retention by Ca- and Fe-rich filter materials under flow-through conditions

Lyngsie, Gry; Penn, Chad J.; Pedersen, Henrik; Borggaard, Ole K.; Hansen, Holger Bernt

doi:10.1016/j.ecoleng.2014.11.009

Cited by 17 publications

(16 citation statements)

References 28 publications

(42 reference statements)

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“…Not only will the P removal curve vary with PSM, but it will also shift as a function of inflow dissolved P concentration ( Figure 1) and RT [36,62]. The greater efficiency in P removal with increasing inflow P concentration as shown in Figure 1 is typical.…”

Section: Influence Of Inflow P Concentration and Retention Timementioning

confidence: 83%

“…However, Fe/Al-based PSMs are less sensitive to RT compared to Ca/Mg-based PSMs. This difference is due to the fact that Ca and Mg phosphate precipitation is usually slower than ligand exchange of P onto Fe and Al oxides/hydroxides [36,62,63]. An important exception is Ca/Mg-based PSMs that: (i) possess a high pH (above 8); (ii) are well buffered with regard to pH; and (iii) produce readily soluble Ca or Mg.…”

Section: Influence Of Inflow P Concentration and Retention Timementioning

confidence: 99%

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A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

Penn

Chagas

Klimeski

et al. 2017

Water

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Controlling dissolved phosphorus (P) losses to surface waters is challenging as most conservation practices are only effective at preventing particulate P losses. As a result, P removal structures were developed to filter dissolved P from drainage water before reaching a water body. While many P removal structures with different P sorption materials (PSMs) have been constructed over the past two decades, there remains a need to evaluate their performances and compare on a normalized basis. The purpose of this review was to compile performance data of pilot and field-scale P removal structures and present techniques for normalization and comparison. Over 40 studies were normalized by expressing cumulative P removal as a function of cumulative P loading to the contained PSM. Results were further analyzed as a function of retention time (RT), inflow P concentration, and type of PSM. Structures treating wastewater were generally more efficient than non-point drainage water due to higher RT and inflow P concentrations. For Ca-rich PSMs, including slag, increased RT allowed for greater P removal. Among structures with low RT and inflow P concentrations common to non-point drainage, Fe-based materials had an overall higher cumulative removal efficiency compared to non-slag and slag materials.

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Section: Influence Of Inflow P Concentration and Retention Timementioning

confidence: 83%

Section: Influence Of Inflow P Concentration and Retention Timementioning

confidence: 99%

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

Penn

Chagas

Klimeski

et al. 2017

Water

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“…The short response of P retention to these hydrological factors, considering the relatively small volume of filters, can result in marked variability in P retention when receiving event-driven drainage discharge. The inflow P concentration, on the other hand, normally contributes positively to both mass and percentage P retention, as it supports sorption reactions with P sorbents [146,154,156].…”

Section: Filter Materialsmentioning

confidence: 99%

“…Thus, the former filters are generally more efficient and can retain more P, whereas the latter may be suitable in situations where the HRT is relatively long and P concentrations are lower (e.g., <2 mg L −1 [138]) [154]. This was clearly demonstrated in a flow-through setting by Lyngsie et al [156], where the Fe-based filter CFH presented a P sorption capacity and affinity 10 times higher than the Ca-based filter Filtralite-P. The study also demonstrated that P release from previously sorbed P was lower in CFH (<10%) than in Filtralite-P (≥35%).…”

Section: Filter Materialsmentioning

confidence: 99%

Edge-of-Field Technologies for Phosphorus Retention from Agricultural Drainage Discharge

Mendes¹

2020

Applied Sciences

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Agriculture is often responsible for the eutrophication of surface waters due to the loss of phosphorus—a normally limiting nutrient in freshwater ecosystems. Tile-drained agricultural catchments tend to increase this problem by accelerating the transport of phosphorus through subsurface drains both in dissolved (reactive and organic phosphorus) and particulate (particle-bound phosphorus) forms. The reduction of excess phosphorus loads from agricultural catchments prior to reaching downstream surface waters is therefore necessary. Edge-of-field technologies have been investigated, developed and implemented in areas with excess phosphorus losses to receive and treat the drainage discharge, when measures at the farm-scale are not able to sufficiently reduce the loads. The implementation of these technologies shall base on the phosphorus dynamics of specific catchments (e.g., phosphorus load and dominant phosphorus form) in order to ensure that local retention goals are met. Widely accepted technologies include constructed wetlands, restored wetlands, vegetated buffer strips and filter materials. These have demonstrated a large variability in the retention of phosphorus, and results from the literature can help targeting specific catchment conditions with suitable technologies. This review provides a comprehensive analysis of the currently used edge-of-field technologies for phosphorus retention in tile-drained catchments, with great focus on performance, application and limitations.

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“…As a result, the positively charged surface of limestone adsorbed H2PO4 − and HPO4 2− via electrostatic attraction. In addition, phosphate could be removed through formation of complex compounds on the limestone during the following reactions occurring on the limestone surface [39][40][41].…”

Section: Removal Of Phosphatementioning

confidence: 99%

Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media

Tong

Zhuang

Chen

2019

Water

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Agricultural nonpoint pollution has been recognized as a primary source of nutrients and pesticides that contaminate surface water and groundwater. Reactive materials have great potential to remove nutrients and pesticides from agricultural drainage water. In this study, we investigated the reactive transport and removal of coexisting nitrate, phosphate, and three pesticides (tricyclazole, isoprothiolane, and malathion) by iron filings and natural ore limestone through column experiments under saturated flow conditions. Breakthrough results showed that 45.0% and 35.8% of nitrate were removed by iron filings and limestone during transport, with average removal capacities of 2670 mg/kg and 1400 mg/kg, respectively. The removal of nitrate was mainly due to microbial denitrification especially after 131–154 pore volumes (≈30 d), whereas reduction to ammonia dominated nitrate removal in iron filings during early phase (i.e., <21.7 d). The results showed that 68.2% and 17.6% of phosphate were removed by iron filings and limestone, with average removal capacities of 416.1 mg/kg and 155.2 mg/kg, respectively. Mineral surface analyses using X-ray diffraction (XRD) and scanning electron microscope (SEM) coupled with energy-dispersive X-ray analysis (EDX) suggested that ligand exchange, chemical precipitation, and electrostatic attraction were responsible for phosphate removal. Chemical sorption was the main mechanism that caused removals of 91.6–100% of malathion and ≈27% of isoprothiolane in iron filings and limestone. However, only 22.0% and 1.1% of tricycalzole were removed by iron filings and limestone, respectively, suggesting that the removal might be relevant to the nonpolarity of tricyclazole. This study demonstrates the great potential of industrial wastes for concurrent removal of nutrients and pesticides under flow conditions.

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Modelling of phosphate retention by Ca- and Fe-rich filter materials under flow-through conditions

Cited by 17 publications

References 28 publications

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

A Review of Phosphorus Removal Structures: How to Assess and Compare Their Performance

Edge-of-Field Technologies for Phosphorus Retention from Agricultural Drainage Discharge

Reactive Transport and Removal of Nutrients and Pesticides in Engineered Porous Media

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