Improved phosphoric acid recovery from sewage sludge ash using layer-by-layer modified membranes
dc.accessRights | Anonymous | * |
dc.audience | Science | en_US |
dc.contributor.author | Paltrinieri, Laura | |
dc.contributor.author | Remmen, Kirsten | |
dc.contributor.author | Müller, Barbara | |
dc.contributor.author | Köser, Joachim | |
dc.contributor.author | Wintgens, Thomas | |
dc.date.accessioned | 2020-03-03T08:40:31Z | |
dc.date.available | 2020-03-03T08:40:31Z | |
dc.date.issued | 2019-10-01 | |
dc.description.abstract | We 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.uri | https://www.sciencedirect.com/science/article/pii/S0376738818334719 | en_US |
dc.identifier.doi | 10.1016/j.memsci.2019.06.002 | |
dc.identifier.issn | 1873-3123 | |
dc.identifier.issn | 0376-7388 | |
dc.identifier.uri | https://irf.fhnw.ch/handle/11654/30646 | |
dc.language.iso | en | en_US |
dc.publisher | Elsevier | en_US |
dc.relation.ispartof | Journal of Membrane Science | en_US |
dc.subject | Layer-by-layer | en_US |
dc.subject | Polyelectrolyte | en_US |
dc.subject | Phosphate recovery | en_US |
dc.subject | Sewage sludge ash | en_US |
dc.subject | Water treatment | en_US |
dc.title | Improved phosphoric acid recovery from sewage sludge ash using layer-by-layer modified membranes | en_US |
dc.type | 01A - Beitrag in wissenschaftlicher Zeitschrift | |
dc.volume | 587 | en_US |
dspace.entity.type | Publication | |
fhnw.InventedHere | Yes | en_US |
fhnw.IsStudentsWork | no | en_US |
fhnw.PublishedSwitzerland | Yes | en_US |
fhnw.ReviewType | Anonymous ex ante peer review of a complete publication | en_US |
fhnw.affiliation.hochschule | Hochschule für Life Sciences | de_CH |
fhnw.affiliation.institut | Institut für Ecopreneurship | de_CH |
fhnw.publicationOnline | Ja | en_US |
fhnw.publicationState | Published | en_US |
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