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Behavior and removal of microplastics during desalination in a lab-scale direct contact membrane distillation system

Title
Behavior and removal of microplastics during desalination in a lab-scale direct contact membrane distillation system
Type
Article in International Scientific Journal
Year
2023
Authors
Fernandes, ART
(Author)
Other
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Manuel Fernando R Pereira
(Author)
FEUP
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Journal
Title: DesalinationImported from Authenticus Search for Journal Publications
Vol. 565
ISSN: 0011-9164
Publisher: Elsevier
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Publicação em ISI Web of Knowledge ISI Web of Knowledge - 0 Citations
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Authenticus ID: P-00Y-RXX
Abstract (EN): The behavior of microplastic particles (MPPs) is explored in a lab-scale direct contact membrane distillation (DCMD) system used to produce drinking water from seawater, while also analyzing the impact of their presence on the process performance. Commercial MPPs (LDPE, PET and uPVC) were first studied by temperature stress (TS) tests (using amber bottles) to mimic the exposure to the high temperatures commonly used in DCMD (ca. 80 degrees C), which led to uPVC being selected to be tested under different loads and aging degrees in the DCMD system. By analyzing uPVC MPPs samples before and after the TS and DCMD experiments by ATR-FTIR, UV-Visible spectroscopy and SEM, it was concluded that minor aging is expected to occur. High loads (>0.1 g L-1) of uPVC MPPs decreased the DCMD performance in terms of permeate flux (from 32.8 & PLUSMN; 0.3 with filtered seawater to 28.7 & PLUSMN; 0.3 kg m- 2 h-1 with a load of 0.2 g L-1), although no signs of inferior treated water quality were found based on the conductivity and salinity results. The removal of MPPs (size > 1.2 & mu;m) in DCMD applications with seawater was analyzed by & mu;Raman, with all the results suggesting very high removal efficiencies (>99 %).
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 12
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