Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 261, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.118253
Keywords
Volatile fatty acids; Organic fraction of municipal solid waste; Grape pomace; Fruit and vegetable waste; Ion exchange resin; Agro-industrial by-product valorisation
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Funding
- EU Horizon 2020 Work Programme
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The study focused on the recovery of carboxylic acids using resins, showing competition between Na+ and AnRes for binding carboxylic acids, while other organic compounds had minimal impact on the adsorption of carboxylic acids.
A strong cationic resin (Lewatit-S2568H) was used to pre-treat four actual broths rich in carboxylic acids (CAs) to obtain free Na+ streams (final pH 1.5-2.4). Thereafter, three weak anionic resins (AnRes) were compared for the recovery of CAs by performing multicomponent batch adsorption tests using one of the pre-treated broths. Subsequently, further multicomponent adsorption tests were performed using the other three broths and the most performant AnRes (Lewatit-A365). This allowed to define adsorption isotherm profiles of CAs, Cl-, phosphates and other organic compounds (CODOther) for each broth. Besides confirming anions competition for resin exchange sites, results also evidenced that Na+ competed with the AnRes exchange sites for binding the CAs, while CODOther exerted a negligible competition for CA adsorption. A homogeneous mass action ideal model, that also considers Na+ competition, was calibrated using the collected data. It shows a very good capability to predict adsorption isotherms despite very dissimilar broths were used.
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