A new approach to assessing the ageing process of strongly basic anion-exchange resins: preliminary research

Wiercik, Paweł; Domańska, Magdalena; Łomotowski, Janusz; Kuśnierz, Magdalena; Konieczny, Tomasz

doi:10.5004/dwt.2019.23497

Cited by 2 publications

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“…The negatively charged ions of the aliphatic side chains of HSs are exchanged for mobile anions (e.g., chloride or hydroxyl ions) connected with the functional groups of AERs. The rest of their structure accumulates on the surface of the AER bead, inhibiting the penetration of counterions into the resin and interrupting the exchange sites [ 2 , 12 , 13 , 14 , 15 ]. The hydrophobic moieties of the organic molecule may also adsorb onto the resin polymer.…”

Section: Introductionmentioning

confidence: 99%

“…UV and UV-vis spectrophotometers provide information on the UV254 and UV absorbance. Fluorescence spectrophotometers and chromatographs provide information on dissolved organic carbon [ 2 , 15 ]. Another method which allows the identification of carbon atoms in organic molecule is 13 C-NMR (carbon-13 nuclear magnetic resonance) spectroscopy [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…FTIR has been used to evaluate the performance of the resins during the softening process [ 20 ], to determine the functional groups in the resin structure responsible for fluoride sorption [ 21 ] and to determine the thermal degradation steps of the analysed resins [ 22 ]. As the author’s previous research has shown [ 2 , 15 ], FTIR is quick and cost-effective method for detecting foulants and observing changes on the surface of AER beads during IE.…”

Section: Introductionmentioning

confidence: 99%

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The Study of Humic Substances’ Impact on Anion Exchangers

Wiercik,

Garbowski,

Chrobot

2024

Materials

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Humic substances (HSs) present in water and wastewater cause fouling of anion exchange resins (AERs), which mainly results in reducing the ion exchange capacity (IEC). In this paper, an attempt was made to investigate fouling of two polystyrene and one polyacrylic AER using water from the Oder River, treated wastewater after the ultrafiltration process (UFTW) and digester reject water from sludge dewatering at the Janówek Wastewater Treatment Plant (WWTP) in Wrocław. HSs contained in digester reject water were characterised by the lowest aromaticity and molecular weights (MWs), the highest proportion of hydrophilic fraction and the highest amount of oxygenated functional groups. The Fourier-transform infrared (FTIR) analyses made it possible to identify chemical bonds characteristic of HSs and determine the mechanism of their retention on the surface of AER beads. The conducted experiments brought unexpected results, as the IEC increased with the amount of organic matter in the feed. Presumably, the humic substances accumulated on the beads and in the porosity of the anion exchangers themselves participated in the ion exchange process.

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