Location: Livestock Bio-SystemsTitle: Tylosin sorption to diatomaceous earth: Investigation of physical processes of tylosin in natural systems and development of mitigation methods
Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 12/13/2017
Publication Date: 2/1/2018
Citation: Stromer, B.S., Woodbury, B.L., Williams, C.F. 2018. Tylosin sorption to diatomaceous earth: Investigation of physical processes of tylosin in natural systems and development of mitigation methods [abstract]. American Chemical Society 255th National Meeting, March 17-22, 2018, New Orleans, LA. ENVR511. Available at: https://plan.core-apps.com/acsnola2018/abstract/e1650562-b0a4-4f93-984d-1e2c44d42ffb
Technical Abstract: Tylosin is a common livestock antibiotic used as a feed additive that could promote antibiotic resistance in the environment. Management of tylosin’s impact on environmental antibiotic resistance requires better understanding of its physical interactions in the environment. Diatomaceous earth (DE) is a naturally occurring siliceous mineral generally used as a contaminant filter after processing using heat and/or fluxing agent. Tylosin Sorption characteristics to chemical grade DE were investigated using Langmuir and Freundlich isotherm models. Results indicate sorption was best described by Langmuir isotherm through physisorption processes. However, thermodynamic properties of sorption indicated more complicated processes. Electrostatic and hydrogen bond/hydrophobic interactions were responsible for sorption. Additional studies looked at sorption characteristic of unprocessed DE compared to fluxcalcined DE. Tylosin sorbed efficiently to unprocessed DE and did not sorb to flux-calcined DE. Preliminary results indicate tylosin is reversibly bound to organic matter, irreversibly bound to clay minerals present in unprocessed diatomaceous earth. Additional work is being done to quantify the role of diatomaceous earth in the sorption process. Results from these studies improved our understanding of tylosin’s interaction in the natural systems. Raw DE will be further investigated as a filter matrix for removing tylosin from agricultural wastewaters.