| Autor: |
Hadiuzzaman, Md1 (AUTHOR), Mirza, Nahreen2 (AUTHOR), Brown, Shawn P.2 (AUTHOR), Ladner, David A.3 (AUTHOR), Salehi, Maryam1,4 (AUTHOR) msalehiesf@gmail.com |
| Předmět: |
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| Zdroj: |
Chemosphere. Nov2023, Vol. 342, pN.PAG-N.PAG. 1p. |
| Abstrakt: |
Heavy metals' interactions with plumbing materials are complicated due to the differential formation of biofilms within pipes that can modulate, transform, and/or sequester heavy metals. This research aims to elucidate the mechanistic role of biofilm presence on Lead (Pb) accumulation onto crosslinked polyethylene (PEX-A), high-density polyethylene (HDPE), and copper potable water pipes. For this purpose, biofilms were grown on new pipes for three months. Five-day Pb exposure experiments were conducted to examine the kinetics of Pb accumulation onto the new and biofilm-laden pipes. Additionally, the influence of Pb initial concentration on the rate of its accumulation onto the pipes was examined. The results revealed greater biofilm biomass on the PEX-A pipes compared to the copper and HDPE pipes. More negative zeta potential was found for the biofilm-laden plastic pipes compared to the new plastic pipes. After five days of Pb exposure under stagnant conditions, the biofilm-laden PEX-A (980 μg m−2) and HDPE (1170 μg m−2) pipes accumulated more than three times the Pb surface loading compared to the new PEX-A (265 μg m−2) and HDPE pipes (329 μg m−2), respectively. However, under flow conditions, Pb accumulation on biofilm-laden plastic pipes was lower than on the new pipes. Moreover, with increasing the initial Pb concentration, greater rates of Pb surface accumulation were found for the biofilm-laden pipes compared to the new pipes under stagnant conditions. First-order kinetics model best described the Pb accumulation onto both new and biofilm-laden water pipes under both stagnant and flow conditions. [Display omitted] • Plastic pipes possess a negative surface charge that magnifies as biofilm accumulates. • In stagnant conditions, biofilm on plastic pipes increased Pb deposition compared to their new pipes. • In water flow conditions, Pb accumulation was lower on biofilm-laden plastic pipes than on new pipes. • In stagnant conditions, higher initial Pb concentration led to increased Pb surface accumulation for biofilm-laden pipes compared to new pipes. • Pb accumulation onto the new and biofilm-laden water pipes followed the 1st-order kinetics model. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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Full Text from ScienceDirect