An integrated environmental model for a surface flow constructed wetland: Water quality processes

Ji, Zhen‐Gang; Jin, Kang-Ren

doi:10.1016/j.ecoleng.2015.09.018

Cited by 17 publications

(6 citation statements)

References 63 publications

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“…LOEM-CW has been applied to the western flow path of STA34. The root mean square error between model and data over six years was 19 mgP¨m´3 for outlet TP, which had an observed mean of 23 mgP¨m´3 [98].…”

Section: Lake Okeechobee Environment Model For Constructed Wetlands (mentioning

confidence: 99%

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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: Lake Okeechobee Environment Model For Constructed Wetlands (mentioning

confidence: 99%

“…This dynamic model attempts to describe movement of water, nutrients, and solids in three dimensions [97,98]. The data demands are very high: for example, hourly wind, solar radiation, air temperature, relative humidity, evapotranspiration, and cloud coverage as the external forcings.…”

Section: Lake Okeechobee Environment Model For Constructed Wetlands (mentioning

confidence: 99%

Large Constructed Wetlands for Phosphorus Control: A Review

Kadlec¹

2016

Water

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“…The two turbulence transport equations implement the Mellor Yamada level 2.5 turbulence closure scheme [21,22]. Applications of the EFDC model include the wetting and drying simulation of Morro Bay, California [23], modeling sediment and metals transport in Blackstone River, Massachusetts [24], simulations of Lake Okeechobee hydrodynamic, thermal, sediment, and water quality processes (e.g., [25]), coupled hydrodynamic and water quality modeling of St. Lucie Estuary (e.g., [26]), and wetland modeling (e.g., [27]). Ji [1] provides detailed discussions of the EFDC model, its applications, and estuarine modeling.…”

Section: Model Setupmentioning

confidence: 99%

Hydrodynamic Modeling of a Large, Shallow Estuary

Ji,

Moustafa,

Hamrick

2024

JMSE

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Florida Bay, a large and shallow estuary, serves as a vital habitat for a diverse range of marine species and holds significant environmental, commercial, and recreational value. The Florida Bay ecosystem is under extensive stress due to decades of increased nutrient loads. Based on the Environmental Fluid Dynamics Code (EFDC), a hydrodynamic model was developed in this study. The model was calibrated with a comprehensive dataset, including measurements over 7 years from 34 tidal stations, 42 current stations, and 14 temperature and salinity stations. Key findings include the following: (1) the bay exhibits a shift in the tidal regime, transitioning from macro-tidal in the western region to micro-tidal in the central and eastern/northeast regions; (2) local winds and the subtidal variations from the coastal ocean are the primary drivers for the hydrodynamic processes in the eastern and central regions; (3) salinity changes in the bay are primarily controlled by three processes: the net supply of freshwater, the processes that drive mixing within the estuary (e.g., wind, topography, currents), and the exchange of salinity with the coastal ocean. This hydrodynamic model is essential for providing a comprehensive tool to address environmental challenges and sustain the bay’s ecosystem health.

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“…Furthermore, the ecological pond utilizes ecological islands to redirect the tailwater: On one hand, it prolongs the path of the wastewater to create a continuous ow state; on the other hand, the ecological islands ful ll the criteria for landscaping and naturalization. Moreover, the shallow water type surface ow wetland system with controllable water level operates similarly to natural marsh wetlands 24 . Plants independently carry out processes like growth, wilting, and decay, relying on the humus in the substrate and organic matter from plant residues as a source of carbon to complete denitri cation and de-nitration.…”

Section: Technology and Vegetation In E-cwmentioning

confidence: 99%

Numerical Simulation and Evaluation of Constructed Wetland Designs for Effluent Treatment Based on MIKE21

Xiong,

Yang,

Zhang

et al. 2024

Preprint

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Constructed Wetlands for Effluent treatment (E-CW) play a vital role in the degradation of pollutants, purification of water, and the improvement of freshwater ecosystems. However, conventional designs often lack a methodical approach for quantifying the efficacy of these wetlands. The present study utilized the MIKE21 Hydrodynamic (HD) module in conjunction with the ECO-Lab Water Quality (AD) module to perform a numerical simulation of the Constructed Wetland for Effluent. The key parameters involved in effective water purification were calibrated and the system's ability to treat effluents from wastewater treatment facilities was assessed. The findings demonstrated significant removal efficiencies for Chemical Oxygen Demand (COD), Total Nitrogen (TN), Total Phosphorus (TP), and ammonia (NH3-N), with average rates of 51.14%, 43.14%, 63.82%, and 54.38%, respectively. In addition, the simulations exhibited a high degree of accuracy, with hydrodynamic predictions deviating by less than 5% and water quality approximations by less than 15%. Additionally, the use of numerical simulations can provide valuable guidelines for the future design and functional assessment of wetlands by offering crucial insights that aid in the optimization of purification processes and vegetation selection.

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An integrated environmental model for a surface flow constructed wetland: Water quality processes

Cited by 17 publications

References 63 publications

Large Constructed Wetlands for Phosphorus Control: A Review

Large Constructed Wetlands for Phosphorus Control: A Review

Hydrodynamic Modeling of a Large, Shallow Estuary

Numerical Simulation and Evaluation of Constructed Wetland Designs for Effluent Treatment Based on MIKE21

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