Related Experiment Video
Updated: Sep 1, 2025
08:49
Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
Published on: May 15, 2017
10.7K
Understanding nutrient dynamics for effective stormwater treatment design.
Buddhi Wijesiri1, An Liu2, Nandika Miguntanna3
1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China; School of Civil and Environmental Engineering, Queensland University of Technology (QUT), GPO Box 2434, Brisbane, Qld 4001, Australia.
The Science of the Total Environment
|August 14, 2022
Summary
New Intensity-Frequency-Duration-Wash-off (IFDW) curves model nutrient runoff, improving stormwater treatment system design. This helps manage urban nutrient pollution and protect water quality.
Area of Science:
- Environmental Engineering
- Hydrology
- Water Quality Management
Background:
- Current stormwater models inadequately represent nutrient entrainment in runoff.
- This deficiency hinders the design of resilient nature-based stormwater treatment solutions for urban environments.
- Untreated stormwater discharge leads to nutrient enrichment, impacting ecosystems and human health.
Purpose of the Study:
- To develop advanced mathematical models for nutrient dynamics in stormwater runoff.
- To integrate these models into Intensity-Frequency-Duration (IFD) rainfall distributions.
- To create novel Intensity-Frequency-Duration-Wash-off (IFDW) curves for improved stormwater management.
Main Methods:
- Conducted field-based nutrient wash-off experiments to understand nutrient behavior during runoff.
- Derived new mathematical formulations to describe nutrient (nitrogen and phosphorus) decay rates.
- Integrated empirical data with statistical modeling to create IFDW curves for 435 design rainfall events.
Main Results:
- Rainfall intensity, duration, and initial pollutant load positively influence nitrogen and phosphorus decay.
- Organic carbon negatively impacts phosphorus decay; phosphorus species wash-off more readily than nitrogen species.
- IFDW analysis indicates total phosphorus is often completely washed-off, while total nitrogen requires rarer events ( <10% AEP) for complete removal.
Conclusions:
- IFDW curves provide a robust tool for designing effective stormwater treatment systems.
- This approach supports sustainable urban stormwater management and water reuse strategies.
- Enhanced modeling of nutrient dynamics is crucial for mitigating pollution in receiving waters.
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