CALL FOR PROPOSALS:

ORGANIZERS

  • Harvey Thorleifson, Chair
    Minnesota Geological Survey
  • Carrie Jennings, Vice Chair
    Minnesota Geological Survey
  • David Bush, Technical Program Chair
    University of West Georgia
  • Jim Miller, Field Trip Chair
    University of Minnesota Duluth
  • Curtis M. Hudak, Sponsorship Chair
    Foth Infrastructure & Environment, LLC

 

Paper No. 7
Presentation Time: 10:30 AM

ALUMINUM-BASED DRINKING-WATER TREATMENT RESIDUALS A “GREEN” SORBENT FOR TETRACYCLINES


PUNAMIYA, Pravin, Earth and Environmental Studies, Montclair State University, 1 Normal Ave, Montclair, NJ 07043, SIDHU, Virinder, Department of Earth and Environmental Studies, Montclair State University, 1 Normal Avenue, Montclair, NJ 07043 and DATTA, Rupali, Department of Biological Sciences, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, punamiyap1@mail.montclair.edu

As the first phase of developing a potential green remediation approach for tetracyclines (TCs), we examined the effects of solution chemistry - pH (3-11), ionic strength (IS) (0.01-0.5M KCl), sorbate: sorbent ratio (SSR) (5-100 g L-1), and reaction time (0.16-96 h) - on tetracycline (TTC) and oxytetracycline (OTC) sorption by a waste byproduct of the drinking-water treatment process, namely, aluminum-based drinking-water treatment residuals (Al-WTRs) as a function of initial TTC and OTC concentrations (0.05-2.0 mM TTC/OTC L-1). The effect of competing ligands, phosphate-P(V) and sulfate, and complexing metal (calcium) on TTC and OTC sorption was also evaluated. Sorption of TTC and OTC on Al-WTR increased with increasing pH up to pH 7, above which it started decreasing in the range of pH 8 to 11. A concentration of 20 g L-1 was deemed as optimum SSR for Al-WTR where more than 95% of the TTC/OTC was sorbed and equilibrium was reached in 2h. The reaction kinetics data best fit second order model (r2=0.99) for both TTC and OTC. Sorption isotherms were plotted to evaluate the effect of IS on TTC/OTC sorption. Best data fits were obtained using the linearized form of the Freundlich isotherm (r2=0.99). No significant effect (p>0.05) of IS on sorption of TTC/OTC was observed between 0.05-0.5 mM. However, at higher initial concentration (>1 mM), IS dependence of TTC sorption was observed. Sorption of TTC/OTC by Al-WTR decreased in the presence of P(V), also exhibiting strong pH dependence. Addition of sulfate did not influence TTC/OTC sorption on Al-WTR. A cooperative effect of calcium on TTC/OTC sorption was observed at alkaline pH. Our research is expected to help develop a “green” remediation technique to immobilize and stabilize TCs in manure and manure-amended soils, and also provide a cost-effective medium for TCs immobilization in wastewater treatment facilities.
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