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Modeling of heteroaggregation driven buoyant microplastic settling: Interaction with multiple clay particles
Yi Wang1, Zipeng Gu1, Xingwei Chen1
1Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou 350117, China; School of Geographical Sciences, School of Carbon Neutrality Future Technology, Fujian Normal University, Fuzhou 350117, China.
The Science of the Total Environment
|December 22, 2024
Summary
This study models buoyant microplastic (BMP) aggregation with multiple clay particles. Ignoring this interaction underestimates BMP settling, crucial for understanding microplastic migration in aquatic environments.
Area of Science:
- Environmental Science
- Chemical Engineering
- Oceanography
Background:
- Microplastic (MP) ecological risk assessment hinges on understanding their environmental migration.
- Heteroaggregation significantly influences MP vertical migration, often modeled mathematically.
- Existing models inadequately simulate buoyant microplastic (BMP) migration due to simplified aggregation assumptions.
Purpose of the Study:
- To develop a novel mathematical model for the heteroaggregation of one BMP with multiple clay particles.
- To identify key factors influencing BMP sedimentation using sensitivity analysis and simulations.
- To improve the accuracy of MP migration predictions in aquatic systems.
Main Methods:
- Developed a Population Balance Equation-based model for one BMP with multiple clay particle heteroaggregation.
- Conducted parameter sensitivity analysis to determine factors affecting BMP sedimentation.
- Performed scenario simulations to evaluate model performance under varying environmental conditions.
Main Results:
- Neglecting multi-particle interactions underestimates BMP settling concentration, particularly in high clay and salinity environments.
- BMP settling is primarily governed by the heteroaggregation rate, which is sensitive to environmental conditions.
- Particle properties showed less influence on the overall settling process compared to environmental factors.
Conclusions:
- The developed model provides a more accurate representation of BMP migration dynamics.
- Future mathematical models must incorporate BMP-multiple clay particle interactions for reliable MP environmental risk assessment.
- Understanding these interactions is vital for predicting microplastic fate and transport in aquatic ecosystems.
