Measured and Predicted Herbicide Removal by Mulch
Publication: Journal of Environmental Engineering
Volume 132, Issue 8
Abstract
The removal of the herbicides diuron, isoxaben, oryzalin, and clopyralid by shredded cedar mulch was studied in laboratory batch and column experiments. The distribution coefficients for the herbicides diuron, isoxaben, and oryzalin measured in batch experiments ranged from 129 to 187 L/kg for raw mulch and from 153 to 341 L/kg for ground mulch. could not be accurately determined for clopyralid because of its weak sorption. A reactive transport model that described adsorption-desorption using a linear two-rate (site) reversible submodel provided a good fit for the experimental breakthrough data for isoxaben from column studies; adjusting the exchange rate coefficients using molecular diffusion coefficient ratios allowed breakthrough curves for oryzalin and diuron to be predicted effectively using no adjustable parameters. Model sensitivity analysis indicates that over 80% herbicide removal efficiency can be obtained for detention times greater than 8 min and storm durations of less than 100 min for the ground mulch particles. Widespread use of mulch as landscape material and the short detention times required for reasonable removal efficiency suggests that a mulch treatment system may be an efficient best management practice; these experimental and model results provide a basis for future pilot testing.
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Acknowledgments
This research has been funded by the National Science Foundation (NSFBES 9733621), the National Institute of Environmental Health Sciences (5 P42 ES04699), and the California Department of Transportation (Caltrans) under Contracts 43A0014 and 43A0073. Kuen Tsay, the Caltrans Project Coordinator, was supportive and helpful throughout the research project. Michael Fischer, Richard White, Yun Lu, Kimberly Peterson, and Claudia Alvarado helped with laboratory analyses. Dr. Peter G. Green provided critical support with analytical methods development and analysis for tracer used for column studies.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 8 • August 2006
Pages: 918 - 925
Copyright
© 2006 ASCE.
History
Received: Jan 12, 2005
Accepted: Oct 12, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
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