An inquiry into the phenomenon of enhanced transport of triazines with treated effluents
Abstract
The use of treated effluents for irrigation has been postulated to facilitate movement of soil-borne pesticides. Factors that may result in enhanced downward movement of pesticides include complexation with dissolved organic material (DOM) present in effluent, coating of soil surfaces with effluent DOM, effluent-induced increases in soil-solution pH, effluent-induced decreases in pore-water velocity, and effluent-induced changes in microbial ecology. The potential of municipal wastewater effluent and swine-derived lagoon effluent to enhance the mobility of prometryn and atrazine was evaluated using batch, column, and modeling techniques. Given the moderate polarity of triazines, facilitated transport of pesticide is most likely not due to complexation with effluent DOM. However, effluent-induced increases in soil-solution pH and decreases in pore-water velocity indicated that there was some potential for enhanced transport under treated-effluent irrigation. Coupled impact of decreased pore-water velocity with wetting and drying event on enhanced pesticide mobility was dependent of soil texture, drying period, and climate conditions.
Degree
Ph.D.
Advisors
Lee, Purdue University.
Subject Area
Agronomy|Soil sciences|Environmental engineering|Environmental science
Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server.