Large-scale constructed wetlands for nutrient removal from stormwater runoff: An everglades restoration project

Guardo, Mariano; Fink, Larry; Fontaine, Thomas D.; Newman, Susan; Chimney, Michael J.; Bearzotti, Ronald; Goforth, Gary

doi:10.1007/bf02471939

Cited by 58 publications

(14 citation statements)

References 3 publications

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“…Mitigation strategies for subbasins with short retention have more limited options than subbasins with long retention times; in urban subbasins with high levels of impervious surface, a higher density of smaller-sized detention devices, such as rain gardens, may be more effective than in subbasins with long retention times, where a smaller number of larger-sized detention devices, such as constructed wetlands or stormwater treatment areas, may work better (cf. Guardo et al 1995).…”

Section: Discussionmentioning

confidence: 95%

Spatial and temporal variability of internal and external phosphorus loads in Mona Lake, Michigan

2007

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A study was conducted in Mona Lake, a small eutrophic lake located in western Michigan (USA) to address the temporal and spatial variability of external and internal phosphorus loading. External P load varied among subbasins, which was mostly related to discharge, but also to land use. Black Creek, which drains lands with natural cover and agriculture, accounted for the majority of flow, and total phosphorus (TP) and soluble reactive phosphorus (SRP) load, to Mona Lake. However, the relative contribution of SRP load was greater in Little Black Creek, which flows through a mostly urbanized subbasin, than in Black Creek. The relative importance of internal loading was strongly related to season, as internal TP loads contributed only *9% of the overall P load in April 2005, but *68-82% of the overall P load in the summer and early fall seasons. Internal TP and SRP loading was greater under anaerobic than aerobic conditions. Mean anaerobic TP release rates ranged from 0.80 to 15.56 mg P m -2 d -1 , varying with site and season. Spatial variability in both internal phosphorus loading and sediment P concentration was also evident. By taking into account the spatial and temporal variability of different loading sources, management practices can be targeted to optimize nutrient source control strategies.

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Section: Discussionmentioning

confidence: 95%

Spatial and temporal variability of internal and external phosphorus loads in Mona Lake, Michigan

2007

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“…(WCA-1). Additional descriptions of operations, water quality, flow, and rainfall quantity monitoring networks within the ENRP are provided in Guardo et al (1995), Abtew (1996), Moustafa (1999), and Moustafa et al (1999).…”

Section: Journal Of the American Water Resources Associationmentioning

confidence: 99%

IDENTIFICATION OF AN OPTIMAL SAMPLING STRATEGY FOR A CONSTRUCTED WETLAND¹

Moustafa¹,

Havens²

2001

J American Water Resour Assoc

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The objective of this investigation was to determine the effect of sampling frequency and sampling type on estimates of monthly nutrient loads and flow‐weighted nutrient concentrations in a constructed wetland. Phosphorus and nitrogen loads and concentrations entering and leaving a subtropical wetland (the Everglades Nutrient Removal Project, ENRP) were calculated on the basis of three sampling frequencies. The first frequency included weekly composite samples (three daily samples composited for one week) and grab samples from August 1994 to July 1997, representing a base‐line condition for comparison with results using reduced sampling frequencies. The second and third sampling frequency included three and two composite samples per month, respectively, drawn from the weekly samples. Total phosphorus and nitrogen loads calculated using two and three samples per month were almost identical to results based on four samples per month (least‐squares regression coefficients ranged from 0.96 to 0.98). Results of monthly mean flow‐weighted nutrient concentrations, obtained using reduced sampling frequencies, also were strongly correlated to concentrations calculated using the base‐line sampling frequency (r2ranged from 0.82 to 0.93). Grab samples did not always provide good estimates of loads or concentrations, particularly at the inflow when data were highly variable. From the results of this study, we can recommend that bi‐weekly composite sampling be used to monitor nutrient concentrations and loads discharged from larger‐scale Everglades Stormwater Treatment Areas (STAs) now under construction. Because there are high costs associated with water sample collection and processing, studies to identify optimal sampling frequencies should be a key feature in the design of any comprehensive wetland‐monitoring program.

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“…The current design of the Everglades Construction Project identifies approximately 162 km 2 of newly constructed wetland to remove P and improve water quality entering the Everglades. The Everglades Nutrient Removal (ENR) Project, a 15.4-kin 2 prototype STA, was built to test and refine STA operational scenarios (Guardo et al 1995). Besides removing P from stormwater prior to entering Everglades Water Conservation Areas, the ENR Project will provide the South Florida Water Management District with engineering and operational experience in the management and operation of large-scale constructed wetlands.…”

Section: P(z)mentioning

confidence: 99%

Graphical representation of nutrient removal in constructed wetlands

Moustafa

1997

Wetlands

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A simple steady state model that is conceptually similar to those of Vollenweider and Dillon was developed to predict phosphorus retention in a wetland treatment system. The proposed model calculates wetland TP outflow concentration (TP.,,,) as a function of TP mass loading rate (L), hydraulic loading rate (q~), and phosphorus settling velocity (v~). A phosphorus-removal diagram was developed, based on this simple model, and plots L, q~, v~ against TPo,, on a three-axis graph. Comparisons between predicted and observed TPo~ t in operating wetlands were in good agreement and indicated that a simple relationship governing phosphorus retention in wetlands exists and this relationship can be used to predict and evaluate wetland treatment performance. The proposed diagram can also be used to answer management questions by manipulating design parameters, such as mass loading and hydraulic loading rate, to evaluate economic impacts due to alternatives such as increasing the size of a wetland surface area, changing water depth, or reducing mass loading rates with pre-treatment options.

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Large-scale constructed wetlands for nutrient removal from stormwater runoff: An everglades restoration project

Cited by 58 publications

References 3 publications

Spatial and temporal variability of internal and external phosphorus loads in Mona Lake, Michigan

Spatial and temporal variability of internal and external phosphorus loads in Mona Lake, Michigan

IDENTIFICATION OF AN OPTIMAL SAMPLING STRATEGY FOR A CONSTRUCTED WETLAND¹

Graphical representation of nutrient removal in constructed wetlands

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Large-scale constructed wetlands for nutrient removal from stormwater runoff: An everglades restoration project

Cited by 58 publications

References 3 publications

Spatial and temporal variability of internal and external phosphorus loads in Mona Lake, Michigan

Spatial and temporal variability of internal and external phosphorus loads in Mona Lake, Michigan

IDENTIFICATION OF AN OPTIMAL SAMPLING STRATEGY FOR A CONSTRUCTED WETLAND1

Graphical representation of nutrient removal in constructed wetlands

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Product

Resources

About

IDENTIFICATION OF AN OPTIMAL SAMPLING STRATEGY FOR A CONSTRUCTED WETLAND¹