Hydraulic Analyses of Stormwater Treatment Areas in South Florida

2000 ◽  
Author(s):  
Peter von Zweck ◽  
Randy Bushey ◽  
Shondra Neumeister
Keyword(s):  
South Florida ◽  
Stormwater Treatment ◽  
Stormwater Treatment Areas

Progress in the research and demonstration of Everglades periphyton-based stormwater treatment areas

2001 ◽  
Vol 44 (11-12) ◽  
pp. 123-130 ◽  
Author(s):  
J.S. Bays ◽  
R.L. Knight ◽  
L. Wenkert ◽  
R. Clarke ◽  
S. Gong
Keyword(s):  
Water Depth ◽  
Phase 1 ◽  
South Florida ◽  
Advanced Treatment ◽  
Stormwater Treatment ◽  
The South ◽  
Stormwater Treatment Areas ◽  
Treatment Technologies ◽  
Test Cells ◽  
Total P

The South Florida Water Management District (District) is conducting research focused on potential advanced treatment technologies to support reduction of phosphorus (P) loads in surface water entering the remaining Everglades. Periphyton-based stormwater treatment areas (PSTA) are one of the advanced treatment technologies being researched by the District. This detailed research and demonstration project is being conducted in two phases. Basic research in field-based mesocosm experiments was conducted during the first phase within the District's Everglades Nutrient Removal Project (ENR). Studies were conducted in 24 portable PSTA mesocosms and three of the south ENR test cells. Phase 1 studies addressed the effects of system substrate (shellrock, organic peat, or sand), water depth, hydraulic loading rate, vegetation presence, depth:width ratio, and inhibition of algal growth on total phosphorus removal performance of the PSTA mesocosms. A second phase of research is currently under way, during which PSTA feasibility will be evaluated further in four field-scale constructed mesocosms totaling about 2 ha, and follow up studies within the ENR test cells and portable mesocosms will be conducted to further investigate the effects of other inorganic substrates, shallow water depth, and velocity on treatment performance. Phase 1 monitoring has determined that periphyton-dominated communities can be established in constructed wetlands within 5 months. The algal component of these periphyton plant communities is characteristic of natural Everglades periphyton. High macrophyte densities resulted from use of peat soils in PSTA mesocosms, while shellrock and sand soils promoted more desirable sparse macrophyte stands. P removal rates under the conditions of this research were relatively high considering the low influent total P concentrations tested (average 23 μg/L). PSTA mesocosms on shellrock soils were able to attain long-term average outflow total P concentrations as low as 11 μg/L. The maximum one-parameter TP first-order removal rate constant (k1) measured was 27 m/y. Minimum attainable outflow total P concentrations and mass removals appear to be the result of a balance between internal P loading from antecedent soils, uptake and burial processes in new sediments, and rainfall inputs. A different soil type (limerock) will be tested for effectiveness during Phase 2. Selected existing treatments will also be continued to look for trends over a second growing season.

Evaluation of phosphorus retention in a South Florida treatment wetland

2001 ◽  
Vol 44 (11-12) ◽  
pp. 109-115 ◽  
Author(s):  
M.K. Nungesser ◽  
M.J. Chimney
Keyword(s):  
Removal Efficiency ◽  
Nutrient Removal ◽  
Aquatic Vegetation ◽  
South Florida ◽  
Superior Performance ◽  
Stormwater Treatment ◽  
Treatment Wetland ◽  
Operational Conditions ◽  
Macrophyte Community ◽  
Floating Macrophyte

The Everglades Construction Project of the South Florida Water Management District (District) will employ large constructed wetlands known as Stormwater Treatment Areas (STAs) to reduce phosphorus concentrations in runoff entering the Everglades. The District built and operated a prototype STA, the 1,545 ha Everglades Nutrient Removal Project (ENRP), to determine the efficacy of subtropical wetlands for improving regional water quality with a focus on reducing total phosphorus (TP). In five years of operation, the ENRP has consistently exceeded its performance goals of TP outflow concentrations <50 μg P/L and a 75% TP load reduction. Since August 1994, the ENRP has retained 70.3 metric tons of TP that otherwise would have entered the Everglades. When corrected for surface area and inflow TP load, TP removal efficiency was highest in the inflow buffer cell and decreased generally in a downstream fashion through the wetland. High TP removal efficiency in treatment cell 4 was attributed to superior performance of its submerged aquatic vegetation community relative to the emergent and floating macrophyte community in the other cells. Controlled experiments in the District's STA Optimization Research Program will help clarify what effect vegetation and operational conditions may have on nutrient removal in the STAs.

Particle dynamics in stormwater treatment areas

2021 ◽  
Vol 160 ◽  
pp. 106131 ◽  
Author(s):  
David C. Fugate ◽  
Serge Thomas ◽  
Leonard J. Scinto
Keyword(s):  
Particle Dynamics ◽  
Stormwater Treatment ◽  
Stormwater Treatment Areas
Sign in / Sign up

Export Citation Format

Share Document