Submerged aquatic vegetation-based treatment wetlands for removing phosphorus from agricultural runoff: response to hydraulic and nutrient loading

Dierberg, Forrest E.; DeBusk, Tom; Jackson, Scott D.; Chimney, Michael J.; Pietro, Kathleen

doi:10.1016/s0043-1354(01)00354-2

Cited by 174 publications

(86 citation statements)

References 19 publications

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“…Early analyses of the Florida STA projects, including size scales ranging from mesocosms to large field-scale systems, indicated that SAV could provide treatment advantages [49]. Accordingly, the flow paths of the STAs were built or retrofitted to contain significant areal percentages of SAV.…”

Section: Florida Stormwater Systemsmentioning

confidence: 99%

Large Constructed Wetlands for Phosphorus Control: A Review

Kadlec¹

2016

Water

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This paper reviews aspects of the performance of large (>40 ha) constructed treatment wetlands intended for phosphorus control. Thirty-seven such wetlands have been built and have good data records, with a median size of 754 ha. All are successfully removing phosphorus from a variety of waters. Period of record median concentration reductions were 71%, load reductions 0.77 gP¨m´2¨year´1, and rate coefficients 12.5 m¨year´1. Large wetlands have a narrower performance spectrum than the larger group of all sizes. Some systems display startup trends, ranging to several years, likely resulting from antecedent soil and vegetation conditions. There are internal longitudinal gradients in concentration, which vary with lateral position and flow conditions. Accretion in inlet zones may require attention. Concentrations are reduced to plateau values, in the range of about 10-50 mgP¨m´3. Vegetation type has an effect upon performance measures, and its presence facilitates performance. Trends in the performance measures over the history of individual systems display only small changes, with both increases and decreases occurring. Such trends remove little of the variance in behavior. Seasonality is typically weak for steady flow systems, and most variability appears to be stochastic. Stormwater systems display differences between wet and dry season behavior, which appear to be flow-driven. Several models of system performance have been developed, both steady and dynamic.

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Section: Florida Stormwater Systemsmentioning

confidence: 99%

Large Constructed Wetlands for Phosphorus Control: A Review

Kadlec¹

2016

Water

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“…The unbalanced biogeochemical cycle of phosphorus in water is a critical reason for eutrophication (Conley et al 2009;Zaaboub et al 2014), while phosphorus migration is closely related to its biological/abiological reactions, i.e., absorption/transfer, sorption/desorption, precipitation/dissolution, oxidation/reduction, and convection/diffusion (Withers and Jarvie 2008;Salerno et al 2014;Baken et al 2015). In general, submerged macrophytes can remove many nutrients from fresh water (Srivastava et al 2008;Dierberg et al 2002) and CaCO 3 -P coprecipitation is reported to play an important role in dephosphorization by submerged macrophytes (Kufel et al 2016). However, little is known about this mechanism.…”

Section: Introductionmentioning

confidence: 99%

Occurrence and characterization of CaCO3-P coprecipitation on the leaf surface of Potamogeton crispus in water

Liu

Guo

Yuan

et al. 2016

Environ Sci Pollut Res

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In this paper, the characterization of CaCO 3 -P coprecipitation on the leaf surface of Potamogeton crispus at various temperatures in pot experiments was investigated. White precipitates occurred on the leaf surfaces during the P. crispus growth period, and the chemical analysis demonstrates that the white precipitates contain Ca and P. The primary constituent of the white precipitates on the leaf of P. crispus was octacalcium phosphate (OCP) and hydroxyapatite. XRD characterization showed that the precipitates mostly consisted of crystals formed by calcium carbonate and hydroxyapatite, and the high calcium/phosphorus ratio indicated that the white coprecipitates were CaCO 3 -P. The scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX) results confirmed that the precipitates on the surface of P. crispus leaves were carbonate-containing hydroxylapatite. In addition, no significant differences was observed in the structure of CaCO 3 -P coprecipitation between room temperature and consistent temperature treatments, which means that a little change in the temperature cannot change the process of Ca-P coprecipitation. Finally, coprecipitation of CaCO 3 -P on the leaf surface of P. crispus was proposed based on the morphology and structure analysis of CaCO 3 -P coprecipitation.

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“…The oyster shells employed as wetland substrate are basically made of CaCO 3 . The phosphorus cycle in wetlands may be influenced by the coprecipitation of phosphate with CaCO 3 in cases of pH increase, as well as by dissolution of phosphate when pH decreases (Wetzel, 1983;Dierberg et al, 2002;Maine et al, 2007a). The courses of pH and orthophosphate levels throughout the treatment in the VFW-B (see Figs.…”

Section: Discussionmentioning

confidence: 99%