Influence of biofilm and calcium carbonate scaling on lead transport in plastic potable water pipes: A laboratory and molecular dynamics study.

Autor: Datta DK; Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, USA., Paramban S; Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, USA., Yazdani H; Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, USA., Brown SP; Department of Biological Sciences, The University of Memphis, Memphis, TN, USA., Fischer S; Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, USA., Salehi M; Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, USA; Missouri Water Center, MO, USA. Electronic address: mshfp@missouri.edu.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2024 Dec 09; Vol. 485, pp. 136831. Date of Electronic Publication: 2024 Dec 09.
DOI: 10.1016/j.jhazmat.2024.136831
Abstrakt: This study investigated lead (Pb) transport through new, biofilm-laden, and calcium carbonate-scaled crosslinked polyethylene (PEX-A) and high-density polyethylene (HDPE) potable water pipes. The research focused on Pb accumulation through short-term exposure incidents (6 h) and Pb release for a longer duration (5 d). A mechanistic investigation of the surface morphology variations of plastic pipes following biofilm and scale formation has been conducted. The nanoscale surface asperities in new PEX-A pipes and microscale roughness features in new HDPE pipes supported the differences in biofilm abundance, scale formation, and metal uptake results between these two pipes. Biomass analysis and dissolved organic matter (DOM) quantification using three-dimensional excitation emission spectroscopy revealed a greater release of biofilm biomass during the Pb accumulation and release experiments from biofilm-laden HDPE pipes. Both biofilm-laden plastic pipes accumulated a significantly greater level of Pb compared to the new and scaled pipes. However, scaled pipes showed the highest Pb release, while biofilm-laden pipes released the least. Additionally, investigation of Pb 2+ exchange from the pipe surface in the presence of Ca 2+ in the solution indicated that divalent cations in water can trigger further Pb release from the pipe surface. Furthermore, the molecular dynamics simulation provided valuable insights into the interaction between different pipe surfaces with Pb with respect to affinity and binding energy.
Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Maryam Salehi reports financial support was provided by National Science Foundation. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier B.V.)
Databáze: MEDLINE
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