Biofouling suppression of modified feed spacers: Localized and long-distance antibacterial activity

TY - JOUR

T1 - Biofouling suppression of modified feed spacers

T2 - Localized and long-distance antibacterial activity

AU - Ronen, Avner

AU - Resnick, Ayal

AU - Lerman, Sofia

AU - Eisen, Moris S.

AU - Dosoretz, Carlos G.

N1 - Publisher Copyright: © 2015 Elsevier B.V.

PY - 2016

Y1 - 2016

N2 - Biofouling hindering activity of two modified feed spacers was assessed. A ‘short-distance’ modification was attained by covalently binding polymeric quaternary ammonium groups (pQAs) to the spacer by atom transfer radical polymerization (ATRP). A ‘long-distance’ modification was based on embedding silver nanoparticles (nAg) in the polymeric spacer by sonochemical deposition. Cross-flow experiments in planar-membrane filtration cells using ultrafiltration membranes exposed to a mixed microbial enrichment were performed at conditions simulating spiral wound modules (0.15 m·s− 1channel flow velocity). Physical properties of the modified spacers were evaluated using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy. Microscopic analysis of the membranes adjacent to the modified spacers indicated the presence of a sporadic monolayer structure compared to a developed biofilm in the untreated spacers. SEM imaging and total organic carbon analysis of the attached layer revealed a low number of bacteria near the modified spacers and adjacent membranes. Both modified spacers displayed improved permeate fluxes compared to the control. nAg modified spacers displayed a somewhat steadier permeate flux profile within the length of the experiments probably due to the release of antibacterial active species. pQA modified spacers are assumed to have a more localized influence by direct contact on their surface.

AB - Biofouling hindering activity of two modified feed spacers was assessed. A ‘short-distance’ modification was attained by covalently binding polymeric quaternary ammonium groups (pQAs) to the spacer by atom transfer radical polymerization (ATRP). A ‘long-distance’ modification was based on embedding silver nanoparticles (nAg) in the polymeric spacer by sonochemical deposition. Cross-flow experiments in planar-membrane filtration cells using ultrafiltration membranes exposed to a mixed microbial enrichment were performed at conditions simulating spiral wound modules (0.15 m·s− 1channel flow velocity). Physical properties of the modified spacers were evaluated using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy. Microscopic analysis of the membranes adjacent to the modified spacers indicated the presence of a sporadic monolayer structure compared to a developed biofilm in the untreated spacers. SEM imaging and total organic carbon analysis of the attached layer revealed a low number of bacteria near the modified spacers and adjacent membranes. Both modified spacers displayed improved permeate fluxes compared to the control. nAg modified spacers displayed a somewhat steadier permeate flux profile within the length of the experiments probably due to the release of antibacterial active species. pQA modified spacers are assumed to have a more localized influence by direct contact on their surface.

KW - Biofouling

KW - Feed spacer

KW - Nano-silver

KW - Quaternary ammonium

KW - Sonochemical deposition

KW - Water treatment

UR - http://www.scopus.com/inward/record.url?scp=84936862258&partnerID=8YFLogxK

U2 - 10.1016/j.desal.2015.07.004

DO - 10.1016/j.desal.2015.07.004

M3 - 文章

AN - SCOPUS:84936862258

SN - 0011-9164

VL - 393

SP - 159

EP - 165

JO - Desalination

JF - Desalination

ER -