1. Modeling carbamazepine transport in wastewater- irrigated soil under different land uses
- Author
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John E. Watson, Vilim Filipović, Heather E. Preisdanz, Lana Filipović, Charles W. Walker, and Clinton F. Williams
- Subjects
Irrigation ,Environmental Engineering ,Wastewater ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,engineering.material ,Waste Disposal, Fluid ,01 natural sciences ,Soil ,Soil Pollutants ,Leaching (agriculture) ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Total organic carbon ,Compost ,04 agricultural and veterinary sciences ,Soil carbon ,modeling ,carbamazepine ,transport ,wastewater-irrigated soil ,land uses ,Pollution ,Carbon ,Carbamazepine ,Environmental chemistry ,040103 agronomy & agriculture ,engineering ,0401 agriculture, forestry, and fisheries ,Environmental science ,Soil horizon ,Waste disposal - Abstract
The pharmaceutical compound carbamazepine (CBZ) is a contaminant of emerging concern. Wastewater irrigation can be a long-term, frequent source of CBZ; therefore, understanding the fate and transport of CBZ as a result of wastewater reuse practices has important environmental implications. The objective of this study was to estimate long-term soil transport of CBZ originating from treated wastewater irrigation on plots under different land uses. Field data from a previous study comparing CBZ concentrations in soil under different land uses were used in numerical modeling with HYDRUS-2D for the estimation of CBZ soil transport during 20 yr of irrigation with treated wastewater. This study showed high CBZ retention in soil under all investigated land uses. Adequate modeling results were obtained by using soil organic carbon-water partitioning coefficient (Koc ) for the CBZ linear sorption coefficient (Kd ) estimation, yet an underestimation of CBZ concentration in soil was still noted. Thus, results suggest that, although highly important, organic carbon content is probably not the only soil property governing CBZ sorption at this site, indicating the potential research perspective. Modeling results showed wastewater irrigation containing CBZ for 20 yr increased the CBZ concentration in the soil profile and its vertical movement, with the slowest vertical transport rate occurring on the forested plots. Overall results suggest that a beneficial management practice could be to increase soil organic carbon (e.g., compost addition) when using treated wastewater for irrigation in order to retain CBZ in the surface soil and thus limit its leaching through the soil profile.
- Published
- 2020