Electronic Theses and Dissertations

Identifier

6601

Date

2020

Document Type

Thesis

Degree Name

Master of Science

Major

Civil Engineering

Concentration

Environmental Engineering

Committee Chair

Maryam Salehi Esfandarani

Committee Member

Shawn Paul Brown

Committee Member

Paul J Palazolo

Abstract

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.

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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