Understanding the effect of Ca and Mg ions from wastes in the solvent regeneration stage of a biogas upgrading unit.

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ID: 43532
2019
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Abstract
This paper reveals the effect of calcium and magnesium ions in carbonation experiments carried out to regenerate sodium hydroxide from a biogas upgrading unit. This novel study arises as an alternative to standard physical process whose elevated energy consumption imposes economic restrictions. Previous works employed alkaline waste to turn them into value added product. Nevertheless, no attractive economical results were obtained due to the low regeneration efficiencies. Our hypothesis is that both calcium and magnesium waste composition percentages have an impact in the result, hence this work propose an isolated study aiming to determine the of each one in the global performance. To this end, the operational parameters (reaction time, reaction temperature and molar ratio) were tuned as well as physicochemical properties of the final solid samples were analyzed by several techniques. The results indicate that calcium is much more prone than magnesium to reach high efficiencies in aqueous carbonation experiments. Additionally, higher quality products were achieved with calcium. The results of this study suppose an important step for understanding the aqueous carbonation through waste in the path to achieve a more sustainable city and society.
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Authors Baena-Moreno, Francisco M;Rodríguez-Galán, Mónica;Reina, T R;Zhang, Zhien;Vilches, Luis F;Navarrete, Benito;
Journal The Science of the total environment
Year 2019
DOI
S0048-9697(19)33248-6
URL
Keywords
sustainable development biogas upgrading aqueous carbonation carbon capture and utilization waste utilization

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