Evolution of the chemistry of Fe bearing waters during CO2 degassing

► The effect of CO2 stripping on the chemistry of Fe bearing waters was investigated. ► Changes in pH, carbonate speciation and Fe(II) oxidation rates were modelled. ► Both net acid and net alkaline waters were investigated. ► Cascades were shown to degass CO2 more efficiently than mechanical aeration. ► Cascade design did not affect CO2 stripping efficiency at the flow rates measured.