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Oscillating-tank experiments for quantification of water-sediment phosphorus exchange
Title
Oscillating-tank experiments for quantification of water-sediment phosphorus exchange.
Creator
Khan, Abul Basher., Florida Atlantic University, Scarlatos, Panagiotis (Pete) D., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Phosphorus exchange between sediment-water system was observed under molecular diffusion and turbulent condition. Some experiments were focused on adsorption behavior under common environmental factors (e.g., temperature, salinity and pH). The sediment suspension was found to have a significant effect on phosphorus movement to the upper layer water. Higher temperature increased the release of phosphorus from kaolinite and lake sediments, and the effect was almost nil for bentonite....
Show morePhosphorus exchange between sediment-water system was observed under molecular diffusion and turbulent condition. Some experiments were focused on adsorption behavior under common environmental factors (e.g., temperature, salinity and pH). The sediment suspension was found to have a significant effect on phosphorus movement to the upper layer water. Higher temperature increased the release of phosphorus from kaolinite and lake sediments, and the effect was almost nil for bentonite. Temperature effect was pronounced on kaolinite where relatively higher release of phosphorus observed. Salinity effect on lake sediments was not significantly important for release or adsorption. Bentonite showed a release of phosphorus after addition of salts. Adsorption on kaolinite was found higher at pH 4.7-5.0. The study was also focused on the estimation of phosphorus partitioning due to molecular diffusion and turbulent mixing. The observed behavior of the phosphorus exchange under different conditions showed an agreement with the observations by the other investigators.
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Date Issued
1993
PURL
http://purl.flvc.org/fcla/dt/14947
Subject Headings
Water--Phosphorus content, Sediment, Suspended, Nutrient interactions, Eutrophication
Format
Document (PDF)
effects of flow on phosphorus uptake by periphyton
Title
The effects of flow on phosphorus uptake by periphyton.
Creator
Simmons, Steven P., Florida Atlantic University, Volin, John C.
Abstract/Description
Everglades restoration includes construction of six Stormwater Treatment Areas (STAs) totaling over 16,000 hectares. These filter marshes are designed to remove excess phosphorus from agricultural runoff and urban wastewater before it reaches the Everglades. Optimizing flow through these wetlands may be important in increasing the efficiency of nutrient removal and achieving lower outflow phosphorus concentrations. We measured periphyton growth and phosphorus uptake in two sets of replicated...
Show moreEverglades restoration includes construction of six Stormwater Treatment Areas (STAs) totaling over 16,000 hectares. These filter marshes are designed to remove excess phosphorus from agricultural runoff and urban wastewater before it reaches the Everglades. Optimizing flow through these wetlands may be important in increasing the efficiency of nutrient removal and achieving lower outflow phosphorus concentrations. We measured periphyton growth and phosphorus uptake in two sets of replicated mesocosms in post-STA treatment water. Flow rates for the study were 1.0 cm s^-1 and 0.11 cm s^-1. Unique mesocosm design allowed for simultaneous control of loading rate, retention time and surface area, leaving flow rate as the single variable between treatments. Periphyton biomass accrual was 25% greater in the faster treatment. Measurements of dissolved oxygen were positively correlated with biomass accrual and there was no significant difference in the export of biomass between treatments.
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Date Issued
2001
PURL
http://purl.flvc.org/fcla/dt/12764
Subject Headings
Periphyton, Water--Phosphorus content--Florida--Everglades
Format
Document (PDF)
effects of flow on the taxonomic composition of Everglades periphyton
Title
The effects of flow on the taxonomic composition of Everglades periphyton.
Creator
Hiaasen, Barbara A., Florida Atlantic University, Volin, John C.
Abstract/Description
Analysis of the relationship of velocity to taxonomic composition of periphyton-based stormwater treatment areas, in conjunction with other metrics, is a valuable tool for evaluating the phosphorus removal efficiency of this Everglades restoration advanced treatment technology. Periphyton taxonomic composition, biomass, water and tissue total phosphorus (TP), pH, and temperature were analyzed in three slow velocity (0.22 cm s-1) and three fast velocity (2.0 cm s-1) mesocosms. Loading rate,...
Show moreAnalysis of the relationship of velocity to taxonomic composition of periphyton-based stormwater treatment areas, in conjunction with other metrics, is a valuable tool for evaluating the phosphorus removal efficiency of this Everglades restoration advanced treatment technology. Periphyton taxonomic composition, biomass, water and tissue total phosphorus (TP), pH, and temperature were analyzed in three slow velocity (0.22 cm s-1) and three fast velocity (2.0 cm s-1) mesocosms. Loading rate, retention time and surface area were kept constant, with velocity the single variable between treatments. There was no significant difference in taxonomic composition, water TP, tissue TP, or temperature between the slow and fast treatments. However, dominant eutrophic and oligotrophic indicator genera exhibited significant and consistent changes in relative abundance related to location along the treatment path. Biomass accrual was 30% greater in the fast treatment and TP uptake was positively correlated with increased velocity.
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Date Issued
2003
PURL
http://purl.flvc.org/fcla/dt/13056
Subject Headings
Periphyton--Florida--Everglades, Water--Phosphorus content--Florida--Everglades
Format
Document (PDF)
Macroalgal blooms on southeast Florida coral reefs I. Nutrient stoichiometry of the invasive green alga Codium isthmocladum in the wider Caribbean indicates nutrient enrichment
Title
Macroalgal blooms on southeast Florida coral reefs I. Nutrient stoichiometry of the invasive green alga Codium isthmocladum in the wider Caribbean indicates nutrient enrichment.
Creator
Lapointe, Brian E., Barile, Peter J., Littler, Mark M., Littler, Diane S., Bedford, Bradley J., Gasque, Constance
Date Issued
2005
PURL
http://purl.flvc.org/FCLA/DT/2827824
Subject Headings
Coral reef biology --Florida, Coral reefs and islands --Florida, Algae, Eutrophication --Toxicology, Water --Nitrogen content, Water --Phosphorus content
Format
Document (PDF)
Sediment phosphorus fractionation in calcium carbonate sediments of northeastern Florida Bay
Title
Sediment phosphorus fractionation in calcium carbonate sediments of northeastern Florida Bay.
Creator
Benz, Robert E., Jr., Florida Atlantic University, Koch, Marguerite
Abstract/Description
Different physiochemical processes control phosphorus storage in subtropical versus temperate estuaries; however, few studies are available on sediment phosphorus storage from the subtropics. In this study, solid-phase phosphorus pools of northeastern Florida Bay's sediments were examined by sequential chemical extractions, separating phosphorus into exchangeable, iron-bound, calcium-bound, and residual organic fractions. Calcium-bound phosphorus was the dominant fraction, accounting for...
Show moreDifferent physiochemical processes control phosphorus storage in subtropical versus temperate estuaries; however, few studies are available on sediment phosphorus storage from the subtropics. In this study, solid-phase phosphorus pools of northeastern Florida Bay's sediments were examined by sequential chemical extractions, separating phosphorus into exchangeable, iron-bound, calcium-bound, and residual organic fractions. Calcium-bound phosphorus was the dominant fraction, accounting for approximately 60% of the total phosphorus and 93% of the inorganic phosphorus. Residual organic phosphorus was the second dominant fraction, accounting for 37% of the total phosphorus. In contrast to calcium-bound and residual organic phosphorus, the concentration of iron-bound phosphorus was low, indicating a limited role of iron in long-term phosphorus storage. The fine-grained carbonate sediments of Florida Bay probably account for the large pool of calcium-bound phosphorus, while the proximity of the mangroves to the northeastern section of the Bay may account for the high residual organic pool of phosphorus.
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Date Issued
2000
PURL
http://purl.flvc.org/fcla/dt/15763
Subject Headings
Water--Phosphorus content, Marine sediments--Florida--Florida Bay, Calcium carbonate, Florida Bay (Fla )--Environmental conditions
Format
Document (PDF)
Macroalgal blooms on southeast Florida coral reefs II. Cross-shelf discrimination of nitrogen sources indicates widespread assimilation of sewage nitrogen
Title
Macroalgal blooms on southeast Florida coral reefs II. Cross-shelf discrimination of nitrogen sources indicates widespread assimilation of sewage nitrogen.
Creator
Lapointe, Brian E., Barile, Peter J., Littler, Mark M., Littler, Diane S., Harbor Branch Oceanographic Institute
Date Issued
2005
PURL
http://purl.flvc.org/FCLA/DT/2827827
Subject Headings
Coral reef biology --Florida, Coral reefs and islands --Florida, Eutrophication --Toxicology, Algae, Water --Nitrogen content, Water --Phosphorus content, Water --Purification --Nitrogen removal
Format
Document (PDF)