Patent ID: 6890497

Claim:
A method of extracting and sequestering CO 2 from a gas stream, said method comprising the steps of: hydrating said CO 2 in said gas stream with an aqueous solution to form carbonic acid, thereby resulting in a CO 2 -depleted gas stream; reacting said carbonic acid with carbonate to form a waste stream solution of metal ions and bicarbonate, wherein said carbonate is of the form X(CO 3 ) m wherein X is any element or combination of elements that can chemically bond with a carbonate group or its multiple, wherein at least one said element is a group IA, IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VB, VIB, VIIB, or VIIIB element of the periodic table, and wherein m is a stoichiometrically determined positive integer; pre-treating said waste stream solution to reduce the amount of CO 2 outgassing and carbonate precipitation that may occur after said waste stream solution is released into a disposal site; and releasing said pre-treated waste stream solution into said disposal site, wherein said disposal site comprises a large body of water.