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dc.contributor.authorPaltrinieri, Laura
dc.contributor.authorRemmen, Kirsten
dc.contributor.authorMüller, Barbara
dc.contributor.authorKöser, Joachim
dc.contributor.authorWintgens, Thomas
dc.date.accessioned2020-03-03T08:40:31Z
dc.date.available2020-03-03T08:40:31Z
dc.date.issued2019-10-01
dc.identifier.doi10.1016/j.memsci.2019.06.002
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/30646
dc.description.abstractWe report an advanced treatment method for phosphoric acid recovery from leached sewage sludge ash. Layer-by-layer (LbL) polyelectrolyte deposition has been used as a tool to modify and convert a hollow ultrafiltration membrane into a nanofiltration (NF) LbL membrane for H3PO4 recovery. To build the LbL membrane, poly(styrenesulfonate) PSS was chosen as polyanion, while three different polycations were used: a permanently charged polyelectrolyte, poly(diallyldimethylammonium chloride), PDADMAC; a pH-dependent charged polyelectrolyte poly(allylamine hydrochloride), PAH; and a PAH modified with guanidinium groups (PAH-Gu). Based on detailed surface characterizations (AFM, XPS and Zeta-potential) it was concluded that both charge density and pH-responsiveness of the polycations are key parameters to control the final membrane surface structure and transport properties. The surface properties of LbL-coated membranes were correlated with the membrane filtration performance, when exposed to the real leached sewage sludge ash solution. The highest permeability was recorded for (PDADMAC/PSS)6, a result that was rationalized on its loose, and possibly less interpenetrated, structure, followed by (PAH-Gu/PSS)6 characterized by a more dense, compact layer. H3PO4 recovery was the highest in the case of (PDADMAC/PSS)6, but the retention of multivalent metals (Fe3+ and Mg2+) was low, leading to a more contaminated permeate. The opposite trend was observed for (PAH-Gu/PSS)6, resulting in a less metal-contaminated, but also a less H3PO4-concentrated permeate. Our LbL-modified membranes were found to improve the permeability and H3PO4 recovery compared to a commercially available acid-resistant NF membrane.en_US
dc.description.urihttps://www.sciencedirect.com/science/article/pii/S0376738818334719en_US
dc.language.isoenen_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.accessRightsAnonymous*
dc.subjectLayer-by-layeren_US
dc.subjectPolyelectrolyteen_US
dc.subjectPhosphate recoveryen_US
dc.subjectSewage sludge ashen_US
dc.subjectWater treatmenten_US
dc.titleImproved phosphoric acid recovery from sewage sludge ash using layer-by-layer modified membranesen_US
dc.type01 - Zeitschriftenartikel, Journalartikel oder Magazin*
dc.volume587en_US
dc.audienceScienceen_US
fhnw.publicationStatePublisheden_US
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publicationen_US
fhnw.InventedHereYesen_US
fhnw.PublishedSwitzerlandYesen_US
fhnw.IsStudentsWorknoen_US
fhnw.publicationOnlineJaen_US


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