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

Membranes

Bingzhi Dong¹  Tian Li¹  Harald Horn²  Hussein Abuelgasim³  IbrahimM. A. ElSherbiny³  Stefan Panglisch³  Greta Birkholz⁴  Lars Dähne⁴  Robert Niestroj-Pahl⁴  Lara Stelmaszyk⁵  Andreas Tiehm⁵  Michaela Krug⁶  Christian Staaks⁶ 

[1] College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;Karlsruher Institut für Technologie, Engler-Bunte Institute, Wasserchemie und Wassertechnologie, 76131 Karlsruhe, Germany;Lehrstuhl für mechanische Verfahrenstechnik/Wassertechnik, Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany;Surflay Nanotec GmbH, Max-Planck-Str. 3, 12489 Berlin, Germany;Technologiezentrum Wasser, Karlsruher Straße 84, 76139 Karlsruhe, Germany;inge GmbH-DuPont, Flurstraße 27, 86926 Greifenberg, Germany;

关键词: layer-by-layer technique;    polymeric membranes;    antibiotic resistance genes;    salt retention;    membrane cleaning;   

DOI  :  10.3390/membranes10120398

来源: DOAJ

【 摘 要 】

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, MgSO₄, CaCl₂ and NaCl, were measured using a mini-plant testing unit. The modified membranes had a retention of 80% toward MgSO₄ and CaCl₂ 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).

【 授权许可】

Unknown