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Performance of Layer-by-Layer-Modified Multibore® Ultrafiltration Capillary Membranes for Salt Retention and Removal of Antibiotic Resistance Genes

Niestroj-Pahl, Robert; Stelmaszyk, Lara; ElSherbiny, Ibrahim M. A.; Abuelgasim, Hussein; Krug, Michaela; Staaks, Christian; Birkholz, Greta; Horn, Harald; Li, Tian; Dong, Bingzhi; Dähne, Lars; Tiehm, Andreas; Panglisch, Stefan

Polyether sulfone Multibore® ultrafiltration membranes were modified using polyelectrolyte multilayers via the layer-by-layer (LbL) technique in order to increase their rejection capabilities towards salts and antibiotic resistance genes. The modified capillary membranes were characterized to exhibit a molecular weight cut-off (at 90% rejection) of 384 Da. The zeta-potential at pH 7 was −40 mV. Laboratory tests using single-fiber modified membrane modules were performed to evaluate the removal of antibiotic resistance genes; the LbL-coated membranes were able to completely retain DNA fragments from 90 to 1500 nt in length. Furthermore, the pure water permeability and the retention of single inorganic salts, MgSO$_{4}$, CaCl$_{2}$ and NaCl, were measured using a mini-plant testing unit. The modified membranes had a retention of 80% toward MgSO$_{4}$ and CaCl$_{2}$ salts, and 23% in case of NaCl. The modified membranes were also found to be stable against mechanical backwashing (up to 80 LMH) and chemical regeneration (in acidic conditions and basic/oxidizing conditions).

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Verlagsausgabe §
DOI: 10.5445/IR/1000129661
Veröffentlicht am 12.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2077-0375
KITopen-ID: 1000129661
Erschienen in Membranes
Verlag MDPI
Band 10
Heft 12
Seiten Art. Nr.: 398
Vorab online veröffentlicht am 06.12.2020
Schlagwörter layer-by-layer technique; polymeric membranes; antibiotic resistance genes; salt retention; membrane cleaning
Nachgewiesen in Scopus
Web of Science
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