Chelating agents for diluted geothermal brine reinjection
نویسندگان
چکیده
Abstract “Blue energy” could be produced by exploiting the large salinity gradient between geothermal fluids and freshwater through a SaltPower system. This study is an attempt to select most favorable chemicals avoid injectivity issues when diluted fluid resulting from system returned reservoir. Three synthetic chelating agents (oxalic acid, EDTA, EDDS) one natural (humic acid) were evaluated speciation simulations isothermal titration calorimetry (ITC) experiments. The simulation results indicate that degree of complexing highly dependent on pH agent type. ITC experiments show total heat for formation soluble metal–ligand complexes in rock + brine follows: EDTA > EDDS oxalic acid humic acid. suggest used precipitation Fe(III) oxides other minerals (e.g., calcite dolomite) inside porous media upon reinjection coming electricity production.
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ژورنال
عنوان ژورنال: Geothermal Energy
سال: 2022
ISSN: ['2195-9706']
DOI: https://doi.org/10.1186/s40517-022-00227-1