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- W3030228519 endingPage "29" @default.
- W3030228519 startingPage "20" @default.
- W3030228519 abstract "Typical used disposable nappies usually consist of nonwoven fabrics, Super Absorbent Polymer (SAP), and organic material, namely fluffy pulp, urine and/or excreta. Currently, this waste stream is being disposed to landfills causing many environmental issues. An alternative management method could be the valorisation of the biodegradable material through anaerobic digestion, and the recycling of plastics and SAP. Pretreatment of nappies is mandatory to separate SAP and plastics from the organic material. The aim of this work was the development of a process to minimize SAP's volume, as this component can swell up to 1500 times its own mass by water absorbance, thus hindering any further biological process. CaCl2, MgCl2, and a range of CaCl2/MgCl2 combinations were tested against their deswelling efficiency on SAP, residual reagent concentration and reagent cost. The mixture of 20% CaCl2 and 50% MgCl2 (w/w) of SAP was concluded as the suitable combination of salts achieving a final SAP volume reduction of 92.7% with low residual cation concentrations and minimum cost. The physicochemical characterization of nappies' hydrolysate that took place to estimate its adequacy as substrate for anaerobic digestion resulted to a COD:N ratio within the acceptable range for a subsequent anaerobic digestion processing." @default.
- W3030228519 created "2020-06-05" @default.
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- W3030228519 date "2020-07-01" @default.
- W3030228519 modified "2023-10-17" @default.
- W3030228519 title "Pretreatment of used disposable nappies: Super absorbent polymer deswelling" @default.
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- W3030228519 doi "https://doi.org/10.1016/j.wasman.2020.05.028" @default.
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