Relevant bibliographies by topics / Phosphorus retention

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Academic literature on the topic 'Phosphorus retention'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Phosphorus retention"

1

Boers, P. C. M., W. Van Raaphorst, and D. T. Van der Molen. "Phosphorus retention in sediments1." Water Science and Technology 37, no. 3 (February 1, 1998): 31–39. http://dx.doi.org/10.2166/wst.1998.0169.

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Phosphate is usually the most important growth limiting nutrient in aquatic environments. The availability of P is the result of external load and retention in the sediments. This latter is the result of a number of transport, microbial and chemical processes. The role of P in the productivity in systems and in the eutrophication process has initiated a large number of studies to the behaviour of P in sediments. Case studies in Veluwemeer, IJsselmeer, Wadden Sea and German Bight show that sorption on and binding in ferric (oxi)hydroxides, occlusion in calcium carbonates and authigenic mineral formation are the most important retention processes. However, all this research did not result in totally new approaches in lake restoration, nor did knowledge of internal P loading result in large scale applications of well-known sediment restoration techniques. It did result in more realistic expectations of lake restoration programmes. At the same time, renewed interest in the overall role of phosphate in the functioning and productivity of systems is emerging. The most important new items are: the role of the productivity is examined at large scale levels; the coupling of productivity with several large scale material cycles and global environmental problems and the study of the behaviour and fate of phosphate within the context of the functioning of entire watersheds.
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Delgado-González, Laura, Bruno Lartiges, Mathieu Gautier, Stéphane Troesch, and Pascal Molle. "Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes." Water Science and Technology 83, no. 4 (January 7, 2021): 792–802. http://dx.doi.org/10.2166/wst.2021.010.

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Abstract Natural apatites have previously shown a great capacity for phosphate retention from wastewater. However, its fine particle size distribution may lead to a premature clogging of the filter. Accordingly, a granulated apatite product was developed and manufactured in order to control the particle size distribution of the media. Experiments were conducted on laboratory columns to assess their phosphorus retention capacity, to identify the processes involved in phosphorus retention and to evaluate their kinetic rates. The results showed phosphorus retention capacities of 10.5 and 12.4 g PO4-P·kg−1 and kinetic rate coefficients in the range of 0.63 and 0.23 h−1 involving lower values than those found for natural apatites in previous studies. Scanning Electron Microscopy images showed that apatite particles in the granules were embedded in the binder and were not readily accessible to act as seeds for calcium phosphate precipitation. The retention processes differ depending on the supersaturation of the solution with respect to calcium phosphate phases: at low calcium concentrations (69.8 ± 3.9 mg·L−1), hydroxyapatite precipitates fill up the porosity of the binder up to a depth of 100–300 μm from the granule surface; at higher calcium concentrations (112.7 ± 7.4 mg·L−1) precipitation occurs at the granule surface, forming successive layers of hydroxyapatite and carbonated calcium phosphates.
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Maavara, Taylor, Christopher T. Parsons, Christine Ridenour, Severin Stojanovic, Hans H. Dürr, Helen R. Powley, and Philippe Van Cappellen. "Global phosphorus retention by river damming." Proceedings of the National Academy of Sciences 112, no. 51 (December 7, 2015): 15603–8. http://dx.doi.org/10.1073/pnas.1511797112.

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More than 70,000 large dams have been built worldwide. With growing water stress and demand for energy, this number will continue to increase in the foreseeable future. Damming greatly modifies the ecological functioning of river systems. In particular, dam reservoirs sequester nutrient elements and, hence, reduce downstream transfer of nutrients to floodplains, lakes, wetlands, and coastal marine environments. Here, we quantify the global impact of dams on the riverine fluxes and speciation of the limiting nutrient phosphorus (P), using a mechanistic modeling approach that accounts for the in-reservoir biogeochemical transformations of P. According to the model calculations, the mass of total P (TP) trapped in reservoirs nearly doubled between 1970 and 2000, reaching 42 Gmol y−1, or 12% of the global river TP load in 2000. Because of the current surge in dam building, we project that by 2030, about 17% of the global river TP load will be sequestered in reservoir sediments. The largest projected increases in TP and reactive P (RP) retention by damming will take place in Asia and South America, especially in the Yangtze, Mekong, and Amazon drainage basins. Despite the large P retention capacity of reservoirs, the export of RP from watersheds will continue to grow unless additional measures are taken to curb anthropogenic P emissions.
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Demars, B. O. L., D. M. Harper, J. A. Pitt, and R. Slaughter. "Impact of phosphorus control measures on in-river phosphorus retention associated with point source pollution." Hydrology and Earth System Sciences 9, no. 1/2 (June 14, 2005): 43–55. http://dx.doi.org/10.5194/hess-9-43-2005.

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Abstract. In-river phosphorus retention alters the quantity and timings of phosphorus delivery to downstream aquatic systems. Many intensive studies of in-river phosphorus retention have been carried out but generally on a short time scale (2-4 years). In this paper, monthly water quality data, collected by the Environment Agency of England and Wales over 12 years (1990-2001), were used to model daily phosphorus fluxes and monthly in-river phosphorus retention in the lowland calcareous River Wensum, Norfolk, UK. The calibrated model explained 79% and 89% of the observed variance before and after phosphorus control, respectively. A split test revealed that predicted TP loads were in good agreement with observed TP loads (r2=0.85), although TP loads were underestimated under high flow conditions. During relatively dry years, there was no net export of phosphorus from the catchment. High retention of phosphorus occurred, particularly during the summer months, which was not compensated for, by subsequent higher flow events. This was despite a relatively modest critical discharge (Q) above which net remobilisation occur. Phosphorus removal from the effluent at two major STWs (Sewage Treatment Works) reduced phosphorus retention but not the remobilisation. This may indicate that the presence of impoundments and weirs, or overbank flows may have more control on the phosphorus dynamics under high flow conditions. Further phosphorus remedial strategies will be necessary to prevent downstream risks of eutrophication occurring independently of the unpredictable variability in weather conditions. More research is also needed to quantify the impact of the weir and overbank flows on phosphorus dynamics.
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Al-Masri, M. R. "Absorption and endogenous excretion of phosphorus in growing broiler chicks, as influenced by calcium and phosphorus ratios in feed." British Journal of Nutrition 74, no. 3 (September 1995): 407–15. http://dx.doi.org/10.1079/bjn19950144.

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Absorption and endogenous excretion of P by male broiler chicks (14–29 d old) were quantitatively evaluated at different Ca: P ratios (1, 1:1; 2, 1·5:1; 3, 2:1; 4, 2·5:1) in four groups given experimental diets ad lib. The P content was the same in all diets. An isotope-dilution technique was used to determine endogenous faecal and renal excretion. Ca and P retentions in the whole body were estimated according to the comparative slaughter technique. P absorption was calculated from retention and endogenous excretion. Absorption and endogenous excretion of P amounted to (mg P/d per chick): 304, 270,160 and 158; and 135, 109, 31 and 30 in groups 1, 2, 3 and 4 respectively. Widening of the Ca:P ratio in the feed limited the P absorption. Availability of feed P amounted to (%): (1) 66, (2) 57, (3) 32 and (4) 30, and the amounts of absorbed P retained were (%): (1) 56, (2) 60, (3 and 4) 81. The increasing Ca concentration in the feed showed a greater effect on P absorption than on P retention. The ratios of relative retention to relative endogenous excretion of absorbed P were: (1) 1·27, (2) 1·50, (3 and 4) 4·26.
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Ige, D. V., O. O. Akinremi, and D. N. Flaten. "Evaluation of phosphorus retention equations for Manitoba soils." Canadian Journal of Soil Science 88, no. 3 (May 2, 2008): 327–35. http://dx.doi.org/10.4141/cjss07075.

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One of the key factors in phosphorus management is the P retention capacity (PRC) of the soil. In our previous study, we formulated several equations for estimating the phosphorus retention capacity of Manitoba soils. The objectives of the current study were to evaluate these equations using independent soil samples and to evaluate the influence of manure application on the predictive ability of these equations. Forty representative surface soil samples (20 soils with history of manure application and 20 without manure application history) were collected from across Manitoba. The P retention index (P150) and Langmuir adsorption maximum (Smax) were determined in the laboratory. The measured P retention capacities were then compared with those estimated using the formulated equations. Surprisingly, P150, which was obtained from a single measurement, was more robust than Smax that was obtained from at least 17 measurements as the equations provided a better estimate of P150 than Smax. Equations that were based on soil particle sizes (either percent clay or percent sand) provided poor estimates of soil PRC for the whole soil collection. However, when the soils were grouped on a pH basis, soil particle size worked better for soils with pH <7 than for soils with pH ≥7. The equations also worked better for soils with pH similar to those of the soils that were used to formulate the P retention equations. The accuracy of the predicted P sorption capacity improved with the manured soils due to the direct influence of manure application on soil properties that influence P retention such as Ca and Mg. Overall, the combination of CaM3, MgM3 and AlOx provided the best estimate of the PRC of Manitoba soils. Key words: Soil phosphorus, calcareous soils, phosphorus sorption, phosphorus retention, phosphorus retention capacity, estimating phosphorus retention capacity
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Pérez, M. M., J. Bossens, E. Rosa, and F. M. G. Tack. "Phosphorus retention capacity in red ferralitic soil." Water Science and Technology 70, no. 9 (September 30, 2014): 1561–68. http://dx.doi.org/10.2166/wst.2014.410.

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In this study the main physical–chemical characteristics of red ferralitic soil to use as substrate in subsurface wetlands was determined. The P-removal was evaluated in a short-term isotherm batch experiment and in a column percolation experiment. The acid characteristic and high content of iron minerals in the red ferralitic soil facilitated the phosphorus removal. Also the sorption isotherms at two different temperatures were obtained. The results showed that the sorption capacity increases with an increase in solution temperature from 25 to 35 °C. The experimental data were fitted to Langmuir and Freundlich models, having a better fit to the Freundlich isotherms. The maximum P-sorption capacities estimated using the Langmuir isotherm were 0.96 and 1.13 g/kg at 25 and 35 °C respectively. Moreover a column experiment was carried out at two different flows. Sequential extractions of the phosphorus-saturated soil indicated that phosphorus is mainly bound with iron or aluminum minerals. The results have demonstrated a good potential for red ferralitic soil for phosphorus removal from urban wastewater.
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Molete, S. F., C. C. du Preez, and M. V. Marake. "Retention of applied phosphorus by the benchmark soils of Lesotho and quantification of their phosphorus retention indices." South African Journal of Plant and Soil 22, no. 4 (January 2005): 214–22. http://dx.doi.org/10.1080/02571862.2005.10634710.

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Marcé, R., and J. Armengol. "Modeling nutrient in-stream processes at the watershed scale using Nutrient Spiralling metrics." Hydrology and Earth System Sciences 13, no. 7 (July 6, 2009): 953–67. http://dx.doi.org/10.5194/hess-13-953-2009.

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Abstract. One of the fundamental problems of using large-scale biogeochemical models is the uncertainty involved in aggregating the components of fine-scale deterministic models in watershed applications, and in extrapolating the results of field-scale measurements to larger spatial scales. Although spatial or temporal lumping may reduce the problem, information obtained during fine-scale research may not apply to lumped categories. Thus, the use of knowledge gained through fine-scale studies to predict coarse-scale phenomena is not straightforward. In this study, we used the nutrient uptake metrics defined in the Nutrient Spiralling concept to formulate the equations governing total phosphorus in-stream fate in a deterministic, watershed-scale biogeochemical model. Once the model was calibrated, fitted phosphorus retention metrics where put in context of global patterns of phosphorus retention variability. For this purpose, we calculated power regressions between phosphorus retention metrics, streamflow, and phosphorus concentration in water using published data from 66 streams worldwide, including both pristine and nutrient enriched streams. Performance of the calibrated model confirmed that the Nutrient Spiralling formulation is a convenient simplification of the biogeochemical transformations involved in total phosphorus in-stream fate. Thus, this approach may be helpful even for customary deterministic applications working at short time steps. The calibrated phosphorus retention metrics were comparable to field estimates from the study watershed, and showed high coherence with global patterns of retention metrics from streams of the world. In this sense, the fitted phosphorus retention metrics were similar to field values measured in other nutrient enriched streams. Analysis of the bibliographical data supports the view that nutrient enriched streams have lower phosphorus retention efficiency than pristine streams, and that this efficiency loss is maintained in a wide discharge range. This implies that both small and larger streams may be impacted by human activities in terms of nutrient retention capacity, suggesting that larger rivers located in human populated areas can exert considerable influence on phosphorus exports from watersheds. The role of biological activity in this efficiency loss showed by nutrient enriched streams remained uncertain, because the phosphorus mass transfer coefficient did not show consistent relationships with streamflow and phosphorus concentration in water. The heterogeneity of the compiled data and the possible role of additional inorganic processes on phosphorus in-stream dynamics may explain this. We suggest that more research on phosphorus dynamics at the reach scale is needed, specially in large, human impacted watercourses.
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Demars, B. O. L., D. M. Harper, J. A. Pitt, and R. Slaughter. "Impact of phosphorus control measures on in-river phosphorus retention associated with point source pollution." Hydrology and Earth System Sciences Discussions 2, no. 1 (January 13, 2005): 37–72. http://dx.doi.org/10.5194/hessd-2-37-2005.

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Abstract. In-river phosphorus retention alters the quantity and timings of phosphorus delivery to downstream aquatic systems. Many intensive studies of in-river phosphorus retention have been carried out but generally on a short time scale (2-4 years). In this paper, monthly water quality data, collected by the Environment Agency of England and Wales over 12 years (1990-2001), were used to model daily phosphorus fluxes and monthly in-river phosphorus retention in the lowland calcareous River Wensum, Norfolk, UK. The effectiveness of phosphorus stripping at two major sewage treatment works was quantified over different hydrological conditions. The model explained 78% and 88% of the observed variance before and after phosphorus control, respectively. During relatively dry years, there was no net export of phosphorus from the catchment. High retention of phosphorus occurred, particularly during the summer months, which was not compensated for, by subsequent higher flow events. The critical discharge (Q) above which net remobilisation would occur, was only reached during few, high flow events Q25-Q13. Phosphorus removal from the effluent at two major STWs (Sewage Treatment Works) reduced the phosphorus catchment mass balance variability by 20-24% under the Q99-Q1. range of flow conditions. Although the absorbing capacity of the catchment against human impact was remarkable, further phosphorus remedial strategies will be necessary to prevent downstream risks of eutrophication occuring independently of the unpredictable variability in weather conditions.
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More sources

Dissertations / Theses on the topic "Phosphorus retention"

1

DʹAngelo, Donna Jean. "Mechanisms governing phosphorus retention in streams /." This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-08252008-162550/.

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D'Angelo, Donna Jean. "Mechanisms governing phosphorus retention in streams." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39241.

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Wang, Naiming. "Modelling Phosphorus Retention in Freshwater Wetlands." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1382617535.

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4

Li, Shijie. "Phosphorus retention and release from agricultural ditch networks." Thesis, Ulster University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646851.

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The potential of agricultural drainage ditch sediments to release and retain phosphorus (P) was investigated at six sites in two sub-catchments of the River Blackwater in Counties Monaghan and Armagh, Ireland. The bed sediment was sampled on a fortnightly basis between April 2008 and March 2009: the sediment (top 1 cm) was analysed for total P, individual P fractions (with a modified Psenner sequential extraction scheme), equilibrium P concentration (EPCo), iron (Fe) and manganese (Mn) concentrations; sediment pore water (top 5 cm) and stream water were analysed for soluble reactive P (SRP). In relation to variation in stream discharge, sediment total P (TP) decreased rapidly during the largest storms, followed by calmer hydrological conditions and recovery in sediment TP. This provides field evidence of sediment TP depletion during storms, demonstrating the physical basis of the sediment's net P release in this study. This is also consistent with the interpretation of storm P-discharge hysteresis, where stream P concentration does not follow the rising and falling limbs of the hydrograph, that high discharge events can mobilise P retained in bed sediment. In terms of sediment P fractionation, the reductant-soluble bicarbonate-dithionite (BO) fraction was by far the largest, in terms of concentration and contribution ratio to TP (medians: 41 % - 62%), and the most sensitive to change in discharge, which suggests that the redox-sensitive binding of P to Fe and Mn hydroxides in the BO fraction was the dominant chemical process controlling sediment P. In addition, an inverse relationship was observed between Fe/P ratio in the BO fraction and sediment TP, but the BO-Fe data has been shown to be compromised due to analytical delays and inadequate sample preservation. This observation would have further indicated the chemical basis to sediment P retention during the recovery from storms: a decrease in Fe/P ratio points to the uptake of P by the reductant-soluble amorphous Fe hydroxide in this fraction. The comparison between sediment EPCo (medians: 0.005 - 0.041 mg P L-1 ) and stream P concentration (medians: 0.023 - 0.129 mg P L-1 ) generally indicated potential for sediment P retention. This was in spite of consistently reducing conditions in the bed sediment and the presence of high pore water P concentration at P-enriched sites (highest median: 2.133 mg P L-1 ). No evidence was found that supports the hypothesis that potential sediment P release contributed to the stream water SRP concentration during the stable low flow periods of the summer. This indicates that rural point sources are more likely to be responsible. Therefore, the ditches acted as temporary storage of P from catchment sources, chemically retaining P during low flow periods, before physically releasing the accumulated P load during episodic high discharge events. Under non-storm conditions, the bed sediment was clearly a P sink, mitigating nutrient enrichment in situ and downstream, by removing in-stream P and delaying downstream transport of P loading from catchment sources. There is a need to understand better the potential P release upon physical disturbance by storm flow - in particular the environmental implications of the dominance of the BD-TP fraction and the reductant-soluble Fe-P binding mechanism in the mobilised bed sediment.
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Kaye, Kriss Young. "Phosphorus accumulation in bottom sediments of retention/detention ponds." Master's thesis, University of Central Florida, 1993. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/71670.

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University of Central Florida College of Engineering Thesis
Laboratory and field studies were conducted to characterize phosphorus in bottom sediments for retention/detention ponds. The laboratory studies, including batch and column experiments, were conducted to assess possible removal processes. Sediment core samples were collected from detention ponds receiving urban runoff. These cores were analyzed for phosphorus at different layers including accumulated top sediments and the lower parent soil beneath it at a depth of 1, 3, 5, 10 and greater than 10 cm. The phosphorus accumulation rate was found to decline with calculated overflow rates from an average storm. Also attenuation of phosphorus with sediment depth followed an exponential decline. Batch experiments showed a higher adsorption capacity to remove phosphorus for top accumulated sediments than the lower parent soil, which is consistent with data from field studies showing greater phosphorus in the sediments. Phosphorus adsorptioncan be described by the Freundlich and Linear isotherms. Mass transfer rates varied with phosphorus concentration and contact time. A generalized model was developed to predict phosphorus removal in column studies.
M.S.
Masters
Civil and Environmental Engineering
Engineering
Environmental Engineering
136 p.
x, 136 leaves, bound : ill. ; 28 cm.
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Greiner, Megan K. "An Analysis of Wetland Total Phosphorus Retention and Watershed Structure." W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539617694.

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Johannesson, Karin. "Particulate phosphorus accumulation and net retention in constructed wetlands receiving agricultural runoff : Critical analysis of factors affecting retention estimates." Doctoral thesis, Linköpings universitet, Teoretisk Biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117116.

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Övergödning är ett allvarligt miljöproblem, som bland annat orsakar omfattande blomningar av alger och blågrönbakterier. I söt- och brackvatten är fosfor ofta det mest begränsande näringsämnet för dessa organismer, varför en minskning av fosfortillförseln är nödvändig för att nå förbättringar. I Sverige beräknas jordbruket bidra med 44 % av fosforbelastningen till Egentliga Östersjön, och olika åtgärder för att minska fosforförlusterna från jordbruksmark tillämpas runtom i Sverige. Våtmarker anläggs ofta för att fånga näringsämnen och partiklar från jordbruksmark innan de läcker ut i vattendrag och slutligen i Östersjön. Tidigare utvärderingar av anlagda våtmarker i Sverige har visat på en varierande och relativt låg fastläggning av fosfor. Osäkerheten kring dessa utvärderingar är dock ganska hög, och bottnar i kunskapsluckor både vad gäller processer för fastläggning och transport av fosfor från mindre jordbruksområden. I denna avhandling utreds därför hur anlagda våtmarker fungerar som fällor för jordpartiklar och partikelbunden fosfor i områden med höga fosforförluster. Sju anlagda våtmarker i jordbruksområden med mycket lerjordar studerades, och mängden fosfor och partiklar som fastlades på botten varierade mycket mellan olika våtmarker (13-108 ton partiklar/ha/yr och 11-175 kg fosfor/ha/yr). De faktorer i området uppströms som var kopplade till fosforfastläggning var lutningen i området, markens lerhalt och innehåll av växttillgänglig fosfor samt områdets djurtäthet. Resultat från fyra våtmarker visade på en hög resuspension (partiklar från botten virvlas tillbaka upp i vattnet), men en del av de uppvirvlade partiklarna kom troligtvis från erosion från våtmarkernas sidor och inte från det material som fastlades på botten. Man såg även indikationer på resuspension från vattenprover tagna i utloppet av en annan våtmark. Där var partikelbunden fosfor klart dominerande, vilket kan ha varit en konsekvens av resuspension från botten. Variationerna av fosforkoncentrationer vid in- och utlopp i sju anlagda våtmarker studerades, för att kritiskt kunna granska tidigare retentionsskattningar. Det var stora variationer i sambanden mellan vattenflöde och fosforkoncentrationer mellan de olika våtmarkerna. De faktorer som påverkade sambandet mellan flöde och koncentration var 1) om det var varm eller kall årstid (d v s sommar eller vinter), 2) om det var högt eller lågt vattenflöde, samt 3) om inflödet bestod av ett dräneringsrör eller ett öppet dike/åfåra. I våtmarker med öppet dike som inflöde var flödes-koncentrationssambandet av totalfosfor negativt vid låga flöden och positivt vid höga flöden. De olika sambanden visar hur viktig sättet att provta vatten är, då inkommande mängd fosfor både kan över- och underskattas om man inte är medveten om sådana variationer. Vid automatisk provtagning styrd av flödesmätningen sker detta ofta i utloppet, men eftersom vattnet har en viss uppehållstid i våtmarken (speciellt sommartid) kan retentionsberäkningen påverkas av att all provtagningen styrs av flödet i utloppet.     För att identifiera vilka områden som bidrar med mest näring och partiklar valdes ett stort område dominerat av jordbruksmark ut – för att undersöka hur man skulle kunna bedöma var anlagda våtmarker skulle kunna göra mest nytta. Området delades in i tio mindre områden, och vattenprover samlades in från diken och åfåror. Resultaten visade på stora skillnader i fosfordynamik mellan olika delområden med olika jordtyper, trots att de hade liknande markanvändning. Det fanns ofta en koppling mellan höga fosforkoncentrationer i vattnet och en hög andel lerjordar i området. För partiklar fanns det en tendens till samband mellan höga koncentrationer och hög andel vinterbar mark. En anlagd våtmark skulle antagligen ha högst effekt om den placerades nedströms områden som är känsliga för erosion – områden med hög andel lerjordar eller med hög andel vinterbar mark.
Eutrophication is one of the more serious current environmental problems, causing algal blooms and anoxic bottoms. In fresh and brackish water, phosphorus (P) is often the most limiting nutrient, and various mitigating strategies are used to reduce the load of P to sensitive recipients. In the agricultural sector, this includes both on-field measures (e.g. managing P inputs) and measures at the field edge (e.g. buffer zones and constructed wetlands). Previous evaluations of constructed wetlands (CWs) in Sweden have indicated a variable and relatively low P retention. However, the uncertainties in the estimates are large, and related to an incomplete knowledge about both retention processes and factors determining the P load from agricultural land. Hence, the overall aim of this thesis was to investigate possible reasons for the variation in wetland P retention estimates, and to assess the P retention in wetlands located in agricultural areas where losses are expected to be high. When comparing seven CWs located downstream small catchments with predominantly arable land, the particle and P net accumulation varied considerably (13-108 t particles ha-1 yr-1 and 11-175 kg P ha-1 yr-1, respectively). Catchment factors that were statistically correlated with accumulation of particles and P in the CWs were the slope of the arable land, the P content of the top soil, the animal density (expressed as livestock units per arable land) and the percentage clay in the topsoils. In four of the wetlands, resuspension was studied using sediment traps and plates. The results showed that up to 87 % of the settled material was resuspended, and indicated that erosion of the wetland sides and bottom probably contributed a substantial part of the trapped particles. In order to critically evaluate existing retention data from earlier investigations, the temporal dynamics of P concentrations and P retention in seven CWs were evaluated. The relationships between water flow and concentration (from grab sampling) varied, and depended on the season (warm or cold period of the year), water flow (high or low) and the inlet type (drainage pipe or open ditch). In CWs that received water through an open ditch, flow-concentration relationships were negative during low flow periods but positive during high flow periods. These differences in flow-concentration relationship have implications for water sampling, since P loads can be both over- and underestimated with grab or automatic sampling guided by clock-time. Also composite automatic sampling, regulated from the water flow at the outlet, can lead to errors in transport calculations since the same ‘water parcel’ is not measured at in and out (difference depending on how long the water retention time is in the CW). This may have an effect on estimates of P retention in both past, present and future investigations of constructed wetlands. Finally, a synoptic sampling approach with ten sampling points was used in an agriculturally dominated catchment area (160 km2) to identify differences in nutrient transport dynamics and areas with the highest losses. Spatial differences in P concentrations were strongly correlated with some of the catchment factors, for instance with soil type, and particle concentrations were weakly correlated to agricultural practices associated with bare soils during winter. This supports the practice to focus P mitigation measures – such as constructed wetlands – to erosion sensitive areas.
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8

Lindqvist, Johanna. "Referensvåtmarker för uppföljning av växtnäringsretention i anlagda våtmarker." Thesis, Halmstad University, School of Business and Engineering (SET), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2613.

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One of the environmental problems today in seas, lakes and streams is eutrophication. This is often caused by nutrients such as phosphorus (P) and nitrogen (N) that leak from agricultural areas. A measure to partly prevent the nutrient discharge is to construct or restore wetlands.

In order to control the efficiency of nutrient reduction of existing wetlands in the county, the administrative board in Västra Götaland wants to find different criterias for reference wetlands. These reference wetlands should represent other wetlands and be used in future evaluations of reduction of nutrients and design of constructed wetlands.

According to the administrative board in Västra Götaland the reference wetlands should have a catchment area of about 50 hectare consisting of at least 70 % arable land, to represent wetlands created to remove nutrients. The surface area should exceed 0,5 hectare and the inlet-nitrogen concentration should be around 5 mg N-1.

This report investigates nitrogen and phosphorus retention in two wetlands, Härstad and Åmot in the county of Västra Götaland, and if they fulfill the criteria of being a reference wetlands. In addition to this, a tracer study was performed in one of these wetlands with the purpose to study the hydraulic efficency.

Neither the wetland in Åmot or Härstad achieves the guidelines of about 5 mg N l-1 in the incoming water. Therefore, they can be seen as inappropriate as reference wetlands according to their nitrogen retention. The wetland of Härstad, however, has significantly better N retention than the wetland of Åmot. Results from the report shows that N retention in the wetland of Härstad was relatively high not only due a higher N load, but also due to that N was largely in the form of NO3- facilitating efficient transformation of NO3- to N2 by denitrification bacteria. Nitrogen removal was much lower in the wetland in Åmot due to that N in incoming water was not in the form of NO3- and could therefore not be efficiently transformed to N2 by denitrification.

Incoming total phosphorus to the Härstad and Åmot wetlands exceeded 100 µg P l-1, which means "extremely high" tot-P concentrations according to environmental quality criteria from the Swedish Environment Protection Agency. Phosphorus load per wetland area was slightly higher in the wetland in Åmot than in the Härstad wetland. In spite of this, P retention per wetland area as well as relative P retention was clearly higher in the Härstad wetland. This can be explained by that P in incoming water to the Härstad wetland was to a larger degree than in the Åmot wetland bound to particles, facilitating P retention through sedimentation.

According to the tracer study, the Härstad wetland has a hydraulic efficency (λ) of about 0,13 which means it has a low hydraulic efficiency. The effective volume ratio (e) in Härstad was calculated to 18 % which means that the water has an inadequate spreading in the wetland, which is not good for the nutrient elimination in this wetland.

This study illustrates the difficulties in finding representative reference wetlands due to potential differences between wetlands in nutrient concentrations in incoming water, the degree that incoming P is bound to particles, the degree that incoming N is in the form of NO3-, and hydraulic efficiency.

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Johannesson, Karin. "Phosphorus retention in a constructed wetland - the role of sediment accretion." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12529.

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A low-loaded constructed wetland was investigated with respect to phosphorus retention. Since the main long-term phosphorus retention mechanism is sedimentation and sediment accretion, the study focused on these processes. The purpose of the study was 1) to investigate how the calculated value of phosphorus retention (Pin – Pout), corresponded with the measured amount of phosphorus in the sediment, 2) to find out where in the wetland the phosphorus had accumulated, and in what form it was retained, and 3) to investigate the role of vegetation. The calculated value was 12 kg ha-1 and the measured value was 104 kg ha-1, which indicated the importance of internal phosphorus circulation, where plants probably take phosphorus from the underlying clay. Hence, vegetation could possibly increase the total phosphorus content in the wetland. The composition of phosphorus in the sediment was analysed using sequential fractionation. The dominating form of phosphorus in the sediment was iron-bound phosphorus (29 %). In total, 48 % of the phosphorus was stable, i.e. tightly bound in the sediment, and 35 % was relatively stable. The bioavailable fraction, which could cause eutrophication in downstream waters, was 17 % of the total phosphorus content, or 41 kg ha-1. The amount of total phosphorus was significantly higher near the inlet, compared to the outlet, which is explained by rapid sedimentation of particulate phosphorus entering the wetland. The phosphorus amount near the inlet represented 80 % of the total phosphorus load – which indicates the importance of internal circulation of phosphorus, both biological and geochemical.

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Thompson, Lisa C. "The influence of hydraulic retention time on planktonic biomass in lakes and reservoirs /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56754.

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Hydraulic retention time (HRT) might contribute to the substantial variation in phosphorus-chlorphyll and chlorophyll-zooplankton models because rapid flushing might depress plankton development. However, for a world-wide data set. HRT was not correlated with chlorophyll. Total phosphorus had no effect on chlorphyll when hypereutrophic sites were considered separately, but chlorophyll was negatively related to HRT. Short term HRT, averaged over periods up to one month, was not correlated with chlorophyll, or zooplankton biomass, in seven impoundments on the St. Lawrence and Ottawa Rivers. The size distribution of algae was not affected by HRT. The proportion of rotifer to total zooplankton biomass was positively related to HRT, but this trend disappeared when nauplius biomass was removed from the total. These results indicate that rapid flushing does not necessarily reduce planktonic biomass and that short term HRT is not useful for the prediction and management of planktonic biomass in these systems.
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Books on the topic "Phosphorus retention"

1

Dillon, Peter James. A comparison of phosphorus retention in lakes determined from mass balance and sediment core calculations. [Toronto]: Queen's Printer for Ontario, 1992.

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Dillon, Peter James. A comparison of phosphorus retention in lakes determined from mass balance and sediment core calculations. [Toronto]: Queen's Printer for Ontario, 1992.

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Dillon, Peter James. A comparison of phosphorus retention in lakes determined from mass balance and sediment core calculations: Report. Toronto, Ont: Ministry of the Environment, 1992.

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Jongbloed, A. W. Phosphorus in the feeding of pigs: Effect of diet on the absorption and retention of phosphorus by growing pigs. Lelystad [Netherlands]: Instituut voor Veevoedingsonderzoek (I.V.V.O.), 1987.

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Branch, Ontario Water Resources. A comparison of phosphorus retention in lakes determined from mass balance and sediment core calculations. Toronto: Queen's Printer for Ontario, 1992.

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Elder, John F. Mesocosm experiments to assess factors affecting phosphorus retention and release in an extended Wisconsin wetland. Middleton, Wis: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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Kuronen, Pirjo. Development of a retention index monitoring method for reversed-phase high-performance liquid chromatography of non-phosphorus chemical warfare agents. Helsinki: Suomalainen Tiedeakatemia, 1990.

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R. Nourmohammadi, H. Khosravinia, and N. Afzali. Effects of high dietary levels of citric acid on productive performance, serum enzyme activity, calcium and phosphorus retention and immune response in broiler chickens. Verlag Eugen Ulmer, 2015. http://dx.doi.org/10.1399/eps.2015.97.

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Sprague, Stuart M., and Menaka Sarav. Chronic kidney disease-mineral and bone disorder. Edited by David J. Goldsmith. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0115_update_001.

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The kidneys play a critical role in maintaining normal serum calcium and phosphorus concentrations, under the regulation of three main hormones: parathyroid hormone, calcitriol, and fibroblast growth factor 23. With the progression of chronic kidney disease (CKD), most patients develop CKD–mineral and bone disorder (CKD-MBD), which is a systemic disorder involving derangement in mineral metabolism, renal osteodystrophy, and extraskeletal calcification. Disturbances in mineral metabolism develop early in CKD and include phosphate retention, hypocalcaemia, vitamin D deficiency, and hyperparathyroidism. Renal osteodystrophy involves pathologic changes of bone morphology related to progressive CKD and is quantifiable by histomorphometry, based on bone biopsy. CKD-MBD is associated with significant morbidity, including bone loss, fractures, cardiovascular disease, immune suppression, as well as increased mortality. As the disorder begins early in the course of CKD, a proactive approach with intervention is important. Therapeutic strategies could then be employed to prevent and correct these disturbances, aiming to improve cardiovascular outcomes and survival. Current practice guidelines for CKD-MBD are based on insufficient data and high-quality studies are required before specific treatment can be advocated strongly.
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Book chapters on the topic "Phosphorus retention"

1

Hylander, Lars D. "Comparison of methods for determination of phosphorus retention." In Plant Nutrition for Sustainable Food Production and Environment, 365–66. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-0047-9_109.

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Ahlgren, Ingemar, Tom Frisk, and Lars Kamp-Nielsen. "Empirical and Theoretical Models of Phosphorus Loading, Retention and Concentration Vs. Lake Trophic State." In Phosphorus in Freshwater Ecosystems, 285–303. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3109-1_17.

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Obi, Yoshitsugu, and Connie M. Rhee. "Phosphorus Retention and Elevated FGF-23 in Chronic Kidney Disease." In Endocrine Disorders in Kidney Disease, 207–21. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97765-2_15.

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Kristensen, P., M. Søndergaard, E. Jeppesen, and H. S. Jensen. "Relationship between iron loading and phosphorus retention in shallow Danish lakes." In Proceedings of the Third International Workshop on Phosphorus in Sediments, 99. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1598-8_8.

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Vanek, Vladimir. "Transport of groundwater-borne phosphorus to Lake Bysjön, South Sweden." In Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers, 211–16. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1602-2_23.

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Kufel, Lech. "Particulate phosphorus sedimentation at the river inflow to a lake." In Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers, 269–74. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1602-2_29.

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Carney, Heath J., Michael W. Binford, Ruben R. Marin, and Charles R. Goldman. "Nitrogen and phosphorus dynamics and retention in ecotones of Lake Titicaca, Bolivia / Peru." In Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers, 39–47. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1602-2_6.

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Dotro, Gabriela, Raul Prieto Fort, Jan Barak, Mark Jones, Peter Vale, and Bruce Jefferson. "Long-Term Performance of Constructed Wetlands with Chemical Dosing for Phosphorus Removal." In The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape, 273–92. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08177-9_19.

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Cristofor, Sergiu, Angheluta Vadineanu, and Gheorghe Ignat. "Importance of flood zones for nitrogen and phosphorus dynamics in the Danube Delta." In Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers, 143–48. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1602-2_17.

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Ejsmont-Karabin, Jolanta, Joanna Królikowska, and Teresa Węgleńska. "Patterns of spatial distribution of phosphorus regeneration by zooplankton in a river—lake transitory zone." In Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers, 275–84. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1602-2_30.

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Conference papers on the topic "Phosphorus retention"

1

Jin Xu, Ligang Xu, Jinbao Wan, and Shu Li. "Phosphorus retention and release by constucted wetland soils." In 2011 International Symposium on Water Resource and Environmental Protection (ISWREP). IEEE, 2011. http://dx.doi.org/10.1109/iswrep.2011.5893599.

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Frisk, T., Ä. Bilaletdin, and H. Kaipainen. "The effect of phosphorus on nitrogen retention in lakes." In WATER POLLUTION 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/wp060131.

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Gao, Hong, Kay K. Bjornen, Arup K. Gangopadhyay, and Ronald K. Jensen. "Oxidation and Antiwear Retention Capability of Low-Phosphorus Engine oils." In Powertrain & Fluid Systems Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-3822.

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Jethwa, Kruti, Samir Bajpai, and P. K. Chaudhari. "Phosphorus Retention in Lateritic Soil Constructed Wetland Treatment of Domestic Sewage." In ASCE India Conference 2017. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784482025.025.

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Grochowska, Jolanta. "THE FACTORS INFLUENCING ON THE PHOSPHORUS AND NITROGEN RETENTION IN FLOW LAKES." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/3.1/s12.093.

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Daniel Steven Andersen, Mathew Justin Helmers, and Robert Thomas Burns. "Phosphorus Retention, Accumulation, and Movement in Six Feedlot Runoff Vegetative Treatment Areas." In 2011 Louisville, Kentucky, August 7 - August 10, 2011. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2011. http://dx.doi.org/10.13031/2013.38163.

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BASTIENĖ, Nijolė, and Valerijus GASIŪNAS. "COMPARATIVE EVALUATION OF DITCH FILTERS WITH PHOSPHORUS SORBING CALCIUM BASED FILTER MATERIALS." In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.049.

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The aim of this paper was to evaluate the sorption capacity of calcium based filter materials (Polonite, Filtralite P and Hyttsand) under Lithuanian conditions. The results obtained from 16 months long ditch filters investigations showed that the efficiency of tested filter materials varies from 60 to 30 % on the average. The filter material Polonite was distinguished by highest reduction capacity of phosphorus, slightly less reduction was determined using Hyttsand and the least using Filtralite-P. The monitoring results confirmed that ditch filters have some ability to the retention of phosphorus and water purification. In total, ditch filters adsorbed about 96–208 g total phosphorus (TP) and 20–124 g phosphate phosphorus (PO4-P) during the reporting period (January 2013 – May 2014).
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Kao, Nady, Chris Parsons, Amanda Niederkorn, Mohamed Mohamed, Ryan Sorichetti, and Philippe Van Cappellen. "Phosphorus Retention in a Dammed Reservoir in Ontario, Canada: Implications for Nutrient Management." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1248.

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Miller, Daniel P., and Gerardo R. Barascout. "Lake Okeechobee Water Retention/Phosphorus Removal Critical Restoration Project Stormwater Treatment Areas (STAs)." In World Water and Environmental Resources Congress 2003. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40685(2003)361.

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GRINBERGA, Linda, and Ainis LAGZDINS. "NUTRIENT RETENTION IN SURFACE FLOW CONSTRUCTED WETLAND IN AGRICULTURAL LAND IN LATVIA." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.179.

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The research site consists of a pilot-scale surface flow constructed wetland at the farm Mezaciruli located in Zalenieki County, Jelgava Region, in the middle part of Latvia. The constructed wetland was installed in June 2014 to improve water quality in agricultural catchment and examine nutrient retention at the constructed wetland receiving surface and drainage runoff. The constructed wetland’s surface area of 0.37 ha corresponds to 0.5 % of the total catchment area. During the observation period of 32 months (2014-2017) water quality parameters such as total suspended solids (TSS), nitrate-nitrogen (NO3-N), ammonium-nitrogen (NH4-N), total nitrogen (TN), orthophosphate-phosphorus (PO4-P), and total phosphorus (TP) were monitored twice a month using a grab sample approach. Retention efficiency for monitored water quality parameters was calculated based on their concentrations at the inlet and outlet. The monitoring results obtained during this study showed a reduction within the constructed wetland for all examined parameters. The concentrations of NO3-N, NH4-N and TN were reduced on average by 13 %, 15 % and 16 %, respectively. PO4-P and TP concentrations were reduced on average by 38 % and 36 %, respectively. Total suspended solids were reduced by 31% at the outlet of the constructed wetland. However, in some cases, an increase in nutrient concentrations in water leaving the constructed wetland was observed. Therefore, there is a need for further research to investigate causes of such increase.
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Reports on the topic "Phosphorus retention"

1

Berkowitz, Jacob, Christine VanZomeren, Nia Hurst, and Kristina Sebastian. An evaluation of soil phosphorus storage capacity (SPSC) at proposed wetland restoration locations in the western Lake Erie Basin. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42108.

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Historical loss of wetlands coupled with excess phosphorus (P) loading at watershed scales have degraded water quality in portions of the western Lake Erie Basin (WLEB). In response, efforts are underway to restore wetlands and decrease P loading to surface waters. Because wetlands have a finite capacity to retain P, researchers have developed techniques to determine whether wetlands function as P sources or sinks. The following technical report evaluates the soil P storage capacity (SPSC) at locations under consideration for wetland restoration in collaboration with the Great Lakes Restoration Initiative (GLRI) and the H2Ohio initiative. Results indicate that the examined soils display a range of P retention capacities, reflecting historic land-use patterns and management regimes. However, the majority of study locations exhibited some capacity to sequester additional P. The analysis supports development of rankings and comparative analyses of areas within a specific land parcel, informing management through design, avoidance, removal, or remediation of potential legacy P sources. Additionally, the approaches described herein support relative comparisons between multiple potential wetland development properties. These results, in conjunction with other data sources, can be used to target, prioritize, justify, and improve decision-making for wetland management activities in the WLEB.
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Mesocosm experiments to assess factors affecting phosphorus retention and release in an extended Wisconsin wetland. US Geological Survey, 1997. http://dx.doi.org/10.3133/wri974272.

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