Method Of Abating Carbon Dioxide And Hydrogen Sulfide

A system for abating carbon dioxide (CO2) and/or hydrogen sulfide (H2S) in a geological reservoir, the system comprising:

• an injection well,
• a merging point for merging water from a water source with a CO2 and/or H2S rich gas stream,
• means for controlling how much CO2 and/or H2S gas is to be dissolved in said water,
• means for controlling a downward velocity of said water within said injection well,
• wherein the system is configured for:
• transferring said water from said water source to said injection well,
• merging said CO2 and/or H2S rich gas stream with said water at said merging point under conditions where the hydraulic pressure of said water is lower than the partial pressure of the CO2 and/or H2S in said CO2 and/or H2S rich gas stream, to create bubbles of CO2 and/or H2S,
• transferring said merged pressurized water and CO2 and/or H2S rich gas stream comprising bubbles of CO2 and/or H2S downwardly at a velocity which:
• when bubbles of CO2 and/or H2S gas in said merged pressurized stream at the merging point have a diameter below 6 mm, is as a minimum 0.4 m/s or below, and,
• when bubbles of CO2 and/or H2S gas in said merged pressurized stream at the merging point have a diameter above 20 mm, is above 0.8 m/s, and
• ensuring downward movement of said merged pressurized water and CO2 and/or H2S rich gas streams comprising bubbles of CO2 and/or H2S from said merging point to a depth where the hydraulic pressure of said water has increased to a pressure required for all of said CO2 and/or H2S to be dissolved,
• keeping the resulting pH value of said pressurized water stream containing said dissolved CO2 and or H2S between about 2 and 4, based on how much CO2 and/or H2S gas is dissolved in said water, and
• injecting the water comprising the dissolved CO2 and/or H2S into the geological reservoir.