Systems and methods for sequestering alkaline carbonates with captured CO
A method for sequestering carbon dioxide (CO 2 ) includes receiving an alkaline fluid stream and receiving an acidic stream. The alkaline fluid stream and the acidic stream are produced by a direct air carbon capture process and the carbonate includes air-captured CO 2 . The method also includes producing a pH balanced CO 2 stream by mixing the alkaline fluid stream with an acidic mixing portion comprising 0% up to 100% of the acidic stream, and storing the pH balanced CO 2 stream in a storage location. The storage location can include at least one of a subsurface location, on land, or in a water body. The storage location and the pH balanced CO 2 stream are configured to provide long-term storage of the air-captured CO 2 .
1 . A method for sequestering carbon dioxide (CO 2 ), comprising:
receiving an alkaline fluid stream comprising carbonate produced by a direct air carbon capture process, the carbonate comprising air-captured CO 2 ,
wherein the direct air carbon capture process comprises using an electrochemical process to produce a hydroxide-rich stream from an input liquid and to produce an acidic stream, and using the hydroxide-rich stream to capture CO 2 from air, thus producing the alkaline fluid stream comprising the carbonate;
receiving the acidic stream produced by the direct air carbon capture process;
producing a pH balanced CO 2 stream comprising mixing the alkaline fluid stream with an acidic mixing portion comprising 0% up to 100% of the acidic stream by alternately injecting the alkaline fluid stream and the acidic mixing portion into a subsurface location; and
storing the pH balanced CO 2 stream in a storage location comprising the subsurface location;
wherein the storage location and the pH balanced CO 2 stream provide long-term storage of the air-captured CO 2 comprising sequestration of the air-captured CO 2 for a time period ranging from decades to thousands of years.
2 . The method of claim 1 , further comprising alternately injecting the alkaline fluid stream and the acidic mixing portion thereby increasing carbonation of mineral rock to expand a mineralization area.
3 . The method of claim 1 , further comprising injecting the alkaline fluid stream and the acidic mixing portion into a subsurface mafic or ultramafic formation.
4 . The method of claim 1 , further comprising mixing the acidic stream with an alkaline material before mixing the alkaline fluid stream with the acidic mixing portion.
5 . The method of claim 4 , wherein the alkaline material comprises mafic or ultramafic rocks.
6 . The method of claim 4 , wherein the alkaline material comprises olivine.
7 . The method of claim 4 , wherein the alkaline material comprises sedimentary material.
8 . The method of claim 1 , wherein alternately injecting the alkaline fluid stream and the acidic mixing portion comprises a repeating loop comprising first injecting the acidic mixing portion and then injecting the alkaline fluid stream.
9 . The method of claim 1 , wherein the storage location comprises a sedimentary basin.
10 . The method of claim 9 , wherein the sedimentary basin comprises a saline aquifer.
11 . The method of claim 9 , wherein the sedimentary basin comprises a depleted oil reservoir.
12 . The method of claim 1 , further comprising dissolving additional CO 2 in the alkaline fluid stream to form alkaline bicarbonates.
13 . A method for sequestering carbon dioxide (CO 2 ), comprising:
receiving an alkaline fluid stream comprising carbonate produced by a direct air carbon capture process, the carbonate comprising air-captured CO 2 ,
wherein the direct air carbon capture process comprises using an electrochemical process to produce a hydroxide-rich stream from an input liquid and to produce an acidic stream, and using the hydroxide-rich stream to capture CO 2 from air, thus producing the alkaline fluid stream comprising the carbonate;
receiving an acidic stream produced by the direct air carbon capture process;
producing a pH balanced CO 2 stream by mixing the alkaline fluid stream with an acidic mixing portion comprising 0% up to 100% of the acidic stream;
injecting the alkaline fluid stream and the acidic mixing portion into a subsurface storage location comprising a mafic or ultramafic formation; and
simultaneously injecting the alkaline fluid stream and the acidic mixing portion at a fluid pressure to create seltzer at the subsurface storage location of the injection or during the injection,
wherein the subsurface storage location and the pH balanced CO 2 stream provide long-term storage of the air-captured CO 2 comprising sequestration of the air-captured CO 2 for a time period ranging from decades to thousands of years.
14 . The method of claim 13 , further comprising dissolving an alkaline material in the acidic stream prior to mixing the alkaline fluid stream with the acidic mixing portion.
15 . The method of claim 13 , further comprising mixing olivine with the acidic stream to produce an alkaline chloride solution and mixing the alkaline chloride solution with the alkaline fluid stream.