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Modelling nitrogen transformations in surface flow wastewater treatment wetlands in Sweden
1Department of Biology, Linköping University, Sweden.
Summary
A simple model for nitrogen removal in wastewater treatment wetlands showed varied success. The model accurately predicted nitrogen concentrations in Hässleholm but not Oxelösund, highlighting the need for improved wetland modeling.
Area of Science:
- Environmental Science
- Water Treatment Engineering
- Ecological Modeling
Background:
- Wastewater treatment wetlands are crucial for nitrogen removal.
- Understanding nitrogen fate in wetlands is key for effective water management.
- Simple models are needed for assessing wetland performance.
Purpose of the Study:
- To compare nitrogen fate in two Swedish wastewater treatment wetlands.
- To evaluate a simple model's ability to predict nitrogen dynamics.
- To identify factors influencing model accuracy.
Main Methods:
- A first-order area-based model was used.
- The model simulated ammonification, nitrification, and denitrification.
- Model performance was assessed using measured nitrogen concentrations.
Main Results:
- The model accurately described nitrogen dynamics in Hässleholm (R2(NH4+-N) = 0.83, R2(NO3(-)-N) = 0.58).
- Model performance was poor for Oxelösund (R2(NH4+-N) = 0.33, R2(NO3(-)-N) = 0.10).
- Adding a temperature coefficient improved nitrate prediction slightly.
Conclusions:
- Model performance varied significantly between wetlands.
- Model calibration requires wetland-specific parameters.
- Future models should incorporate factors like dissolved oxygen, hydraulic efficiency, plant uptake, and ammonia volatilization for improved accuracy.