Method of abating carbon dioxide and hydrogen sulfide

A method for abatement of carbon from carbon dioxide (CO2) and/or sulfur from hydrogen sulfide (H2S) by mineralization and precipitation in a geological reservoir comprising reactive rocks thereby mitigating the need for venting carbon dioxide (CO2) and/or hydrogen sulfide (H2S) to the atmosphere, comprising:

• pumping or transferring water from a water source into an outer pipe of an injection well, said outer pipe having an open end at a depth h1+h2, thereby creating a pressurized water stream in said outer pipe,
• pumping a CO2 and/or H2S rich gas into an injection pipe extending downwardly into said injection well inside said outer pipe thereby creating a CO2 and/or H2S rich gas stream comprising pressurized CO2, and/or pressurized H2S, in said injection pipe;
• dissolving substantially all of said pressurized CO2 and/or H2S gas of said CO2 and/or H2S rich gas stream in said pressurized water stream by:
• merging said pressurized water stream and said CO2 and/or H2S rich gas stream in said outer pipe by providing said injection pipe with an open end at a depth, h1≥0, where the hydraulic pressure of said water in said outer pipe, p(W), is lower than the pressure of said CO2 and/or H2S, p(CO2) and/or p(H2S), in said injection pipe, and
• transferring said merged pressurized water and CO2 and/or H2S rich gas streams from said depth h1≥0 to said open end of said outer pipe at said depth h1+h2, where (h1+h2)>h1, at a downward flow velocity, v(W), which relative to a point where the gasses are injected into the injection well, h1≥0, is as a minimum of between 0.4 m/s and 1.4 m/s and thereby ensures that for a given subpart of the water stream the hydraulic pressure of the water is larger than a sum of a partial pressure of the dissolved CO2 and/or H2S after the gasses have been injected into the water and such that a drag force of the downward flowing water into the injection well is higher than an upward flow velocity of said CO2 and/or H2S gas, v(CO2) and/or v(H2S), resulting from a buoyant force on bubbles of CO2 and/or H2S gas in said water stream at said depth h1+h2, said bubbles having a diameter less than 6 mm;
• keeping a pH of said pressurized water stream containing said dissolved CO2 and/or H2S in said outer pipe between about 2 and 4 to promote dissolution of minerals and leaching of cations from said reactive rocks;
• and
• injecting said pressurized water stream comprising dissolved CO2 and/or H2S in said outer pipe into said geological reservoir comprising said reactive rocks at the open end of said outer pipe at the depth h1+h2, or at a depth>(h1+h2)
• thereby promoting dissolution of said minerals from said reactive rocks of said geological reservoir and providing said cations, necessary for carbon and sulfur mineralization and abatement of the carbon and sulfur of said dissolved carbon dioxide (CO2) and/or hydrogen sulfide (H2S) in said geological reservoir.