Georeferenced regional simulation and aquatic exposure assessment

Area of Science:

• Environmental Science
• Hydrology
• Chemical Fate and Transport

Background:

• Wastewater management requires accurate prediction of chemical behavior in aquatic systems.
• Assessing the environmental risks of down-the-drain chemicals necessitates robust modeling approaches.

Purpose of the Study:

• To develop and validate a simulation model for wastewater pathways and aquatic fate.
• To calculate temporal and spatial concentration distributions of chemicals in river networks.
• To provide data for probabilistic risk assessments.

Main Methods:

• Coupling a simulation model system with a digitized river network.
• Calculating temporal concentration distributions using variable and uncertain input data.
• Comparing model predictions with monitoring data for validation.

Main Results:

• Model predictions showed accuracy within a factor of three for studied pilot catchments.
• The model successfully calculated temporal concentration distributions of down-the-drain chemicals.
• Spatial distributions provided stochastic, regional information for risk assessments.

Conclusions:

• The developed simulation model system is effective for predicting chemical fate in aquatic environments.
• The model's accuracy supports its use in environmental risk assessments.
• Stochastic spatial data enhances regional probabilistic risk evaluations.