Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid
Nanofiltration (NF) can enable P recovery from waste streams via retaining multivalent impurities from spent pickling acid. However, with the currently available membranes, an economically feasible process is impossible. Layer-by-layer modified NF membranes are a promising solution for the recovery...
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2020-04-01
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doaj-ff8090dd759c4f89864bd85d31ce67d02020-11-25T02:04:02ZengMDPI AGMembranes2077-03752020-04-0110616110.3390/membranes10040061Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric AcidKirsten Remmen0Barbara Müller1Joachim Köser2Matthias Wessling3Thomas Wintgens4School of Life Sciences, Institute for Ecopreneurship, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 36, 4132 Muttenz, SwitzerlandSchool of Life Sciences, Institute for Ecopreneurship, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 36, 4132 Muttenz, SwitzerlandSchool of Life Sciences, Institute for Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 36, 4132 Muttenz, SwitzerlandChemical Process Engineering, RWTH Aachen University, Forckenbeckstrasse 51, 52074 Aachen, GermanySchool of Life Sciences, Institute for Ecopreneurship, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 36, 4132 Muttenz, SwitzerlandNanofiltration (NF) can enable P recovery from waste streams via retaining multivalent impurities from spent pickling acid. However, with the currently available membranes, an economically feasible process is impossible. Layer-by-layer modified NF membranes are a promising solution for the recovery of P from acidic leachate. LbL membranes show a high level of versatility in terms of fine tuning for ion retention, which is necessary to achieve sufficient phosphorus yields. However, the stability of layer-by-layer modified membranes during phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) filtration needs to be further investigated. In our study, we show that a polyethersulfone hollow fiber membrane modified with four or eight bi-layers was stable during immersing and filtering of a 15% H<sub>3</sub>PO<sub>4</sub> solution. A sulfonated polyethersulfone (sPES)-based hollow fiber LbL membrane was only stable during filtration. Thus, we show the importance of applying real process conditions to evaluate membranes. Another important aspect is the influence of the high ionic strength of the feed solution on the membrane. We show that a high ionic strength led to a decrease in Mg retention, which could be increased to 85% by adjusting the process parameters.https://www.mdpi.com/2077-0375/10/4/61LbL modified membranesacid stable membranephosphorus recovery |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kirsten Remmen Barbara Müller Joachim Köser Matthias Wessling Thomas Wintgens |
spellingShingle |
Kirsten Remmen Barbara Müller Joachim Köser Matthias Wessling Thomas Wintgens Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid Membranes LbL modified membranes acid stable membrane phosphorus recovery |
author_facet |
Kirsten Remmen Barbara Müller Joachim Köser Matthias Wessling Thomas Wintgens |
author_sort |
Kirsten Remmen |
title |
Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid |
title_short |
Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid |
title_full |
Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid |
title_fullStr |
Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid |
title_full_unstemmed |
Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid |
title_sort |
assessment of layer-by-layer modified nanofiltration membrane stability in phosphoric acid |
publisher |
MDPI AG |
series |
Membranes |
issn |
2077-0375 |
publishDate |
2020-04-01 |
description |
Nanofiltration (NF) can enable P recovery from waste streams via retaining multivalent impurities from spent pickling acid. However, with the currently available membranes, an economically feasible process is impossible. Layer-by-layer modified NF membranes are a promising solution for the recovery of P from acidic leachate. LbL membranes show a high level of versatility in terms of fine tuning for ion retention, which is necessary to achieve sufficient phosphorus yields. However, the stability of layer-by-layer modified membranes during phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) filtration needs to be further investigated. In our study, we show that a polyethersulfone hollow fiber membrane modified with four or eight bi-layers was stable during immersing and filtering of a 15% H<sub>3</sub>PO<sub>4</sub> solution. A sulfonated polyethersulfone (sPES)-based hollow fiber LbL membrane was only stable during filtration. Thus, we show the importance of applying real process conditions to evaluate membranes. Another important aspect is the influence of the high ionic strength of the feed solution on the membrane. We show that a high ionic strength led to a decrease in Mg retention, which could be increased to 85% by adjusting the process parameters. |
topic |
LbL modified membranes acid stable membrane phosphorus recovery |
url |
https://www.mdpi.com/2077-0375/10/4/61 |
work_keys_str_mv |
AT kirstenremmen assessmentoflayerbylayermodifiednanofiltrationmembranestabilityinphosphoricacid AT barbaramuller assessmentoflayerbylayermodifiednanofiltrationmembranestabilityinphosphoricacid AT joachimkoser assessmentoflayerbylayermodifiednanofiltrationmembranestabilityinphosphoricacid AT matthiaswessling assessmentoflayerbylayermodifiednanofiltrationmembranestabilityinphosphoricacid AT thomaswintgens assessmentoflayerbylayermodifiednanofiltrationmembranestabilityinphosphoricacid |
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