Real-time monitoring of organic contaminant adsorption in activated carbon filters using spectral induced polarization

•SIP was used for real-time monitoring of organic dyes’ adsorption to AC.•Adsorbed dye concentration was found to correlate with imaginary conductivity.•An SIP-calibrated model accurately predicted outflow concentrations.•SIP monitoring-effectivity was shown also over adsorption-desorption cycles. [...

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Bibliographic Details
Published in:Water research (Oxford) 2022-04, Vol.212, p.118103-118103, Article 118103
Main Authors: Ben Moshe, Shany, Furman, Alex
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Charcoal
Coloring Agents
Electric Conductivity
Organic dyes
Real-time monitoring
Reproducibility of Results
Spectral induced polarization
Water Pollutants, Chemical
Water Purification
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Summary:•SIP was used for real-time monitoring of organic dyes’ adsorption to AC.•Adsorbed dye concentration was found to correlate with imaginary conductivity.•An SIP-calibrated model accurately predicted outflow concentrations.•SIP monitoring-effectivity was shown also over adsorption-desorption cycles. [Display omitted] Real-time, in-situ monitoring of adsorption processes in activated carbon (AC) filters may advance the effectiveness, reliability and economical value of such systems. In this study, the applicability of spectral induced polarization (SIP) as a real-time monitoring tool was examined. The adsorption of anionic and cationic organic dyes to commercial-AC filter was examined using a set of breakthrough experiments combined with continuous SIP monitoring. The imaginary part of the complex electrical conductivity decreased in the range of 0.25−2.5Hz for both dyes. During the adsorption of the cationic dye, a new peak developed in the range of 7−40Hz, suggesting the dominance of surface processes that are not explained by the classic stern-layer polarization theory. The recorded imaginary conductivity values were used as a proxy for adsorbed dye concentration in the calibration process of a reactive transport model. The model confirmed that SIP can successfully be used for real-time monitoring of the dye progression through the filter. The applicability of SIP as an effective monitoring tool was also shown for cyclic operation (adsorption-desorption cycles).
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2022.118103