A method and a system for abating h2s and co2 from h2s and co2 rich gas mixtures such as geothermal non-condensable gas mixtures

A system for abating hydrogen sulfide (H2S) and carbon dioxide (CO2) from a Non-Condensable Gas (NCG) mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, comprising at least the following:

• means for pressurizing said NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, to a pressure between 3 and 20 bar, and
• means for contacting a stream of said pressurized NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, with a stream of water (W2),
• means for absorption of at least part of said H2S and CO2 from said pressurized NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar, into said water stream (W2), thereby separating said at least part of said H2S and CO2 from at least part of said at least also one of H2, N2, CH4 and/or Ar and producing a stream of water (W4) enriched with dissolved H2S and CO2 comparable to said water stream (W2) and a stream of pressurized gas (G3), which has been depleted of H2S and CO2 compared to said NCG mixture (G1), encompassing H2S and CO2 and at least also one of H2, N2, CH4 and/or Ar,
• means for transferring said water stream (W4) enriched with dissolved H2S and CO2:
• either to an injection well for injecting said water stream (W4) into a geological reservoir, or
• to a system for injection of a water stream (W5) into a geological reservoir for use of said water stream (W4) as an aid for pH-regulation of said water stream (W5).