Next Article in Journal
Effect of Bridgehead Methyl Substituents on the Gas Permeability of Tröger’s-Base Derived Polymers of Intrinsic Microporosity
Next Article in Special Issue
Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate
Previous Article in Journal
N,N’-Bis(salicylidene)ethylenediamine (Salen) as an Active Compound for the Recovery of Ni(II), Cu(II), and Zn(II) Ions from Aqueous Solutions
Open AccessArticle

Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid

1
School of Life Sciences, Institute for Ecopreneurship, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 36, 4132 Muttenz, Switzerland
2
School of Life Sciences, Institute for Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 36, 4132 Muttenz, Switzerland
3
Chemical Process Engineering, RWTH Aachen University, Forckenbeckstrasse 51, 52074 Aachen, Germany
4
Institute of Environmental Engineering (ISA), RWTH Aachen University, Mies-van-der-Rohe-Str. 1, 52074 Aachen, Germany
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(4), 61; https://doi.org/10.3390/membranes10040061
Received: 28 February 2020 / Revised: 29 March 2020 / Accepted: 31 March 2020 / Published: 3 April 2020
(This article belongs to the Special Issue Membrane Technologies for Nutrient Recovery)
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 (H3PO4) 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% H3PO4 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. View Full-Text
Keywords: LbL modified membranes; acid stable membrane; phosphorus recovery LbL modified membranes; acid stable membrane; phosphorus recovery
Show Figures

Figure 1

MDPI and ACS Style

Remmen, K.; Müller, B.; Köser, J.; Wessling, M.; Wintgens, T. Assessment of Layer-By-Layer Modified Nanofiltration Membrane Stability in Phosphoric Acid. Membranes 2020, 10, 61.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop