Date of Award
Master of Science
Maryam Salehi Esfandarani
Shawn Paul Brown
Paul J Palazolo
In this study, the influence of biofilm presence and water chemistry conditions on lead (Pb) deposition onto low density polyethylene (LDPE) surface was examined. The results demonstrated that biofilm presence on LDPE surfaces strongly and significantly enhanced Pb uptake, with 13-fold greater equilibrium Pb surface loading when biofilm was present (1602 µg/m2) compared to when it was absent (124 µg/m2). Pseudo 2nd order kinetic model best described Pb adsorption to LDPE with biofilm. Pb adsorption onto new LDPE surface was significantly reduced from 1101 µg/m2 to 134 µg/m2 with increased aqueous solution's ionic strength from 3*10-6 M to 0.0072 M. The presence of chlorine residual (2 mg/L) significantly reduced Pb adsorption onto LDPE surfaces by possible oxidation of Pb2+ to Pb4+ species. The kinetics of Pb release from LDPE surfacea was investigated under static and dynamic conditions at pH 5.0 and 7.8.
dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.
Ahamed, Tanvir, "Investigate the Role of Biofilm and Water Chemistry on Lead Deposition onto and Release from Polyethylene: An Implication for Potable Water Pipes" (2020). Electronic Theses and Dissertations. 2106.