Methods of sequestering co2

Abstract

Methods of sequestering carbon dioxide (CO 2 ) are provided. Aspects of the methods include precipitating a storage stable carbon dioxide sequestering product from an alkaline-earth-metal-containing water and then disposing of the product, e.g., by placing the product in a disposal location or using the product as a component of a manufactured composition. Also provided are systems for practicing methods of the invention.

1 - 20 . (canceled) 
     
     
         21 . A method of sequestering carbon dioxide from a gaseous waste stream of an industrial plant, comprising:
 a) charging brine with the gaseous waste stream to produce a CO 2 -charged solution;   b) producing a slurry from the CO 2 -charged solution, wherein the slurry comprises carbonates and/or bicarbonates; and   c) pumping the slurry underground.   
     
     
         22 . The method of  claim 21 , wherein the industrial plant is a power plant or a cement plant. 
     
     
         23 . The method of  claim 22 , wherein the gaseous waste stream further comprises SOx, mercury, or both. 
     
     
         24 . The method of  claim 23 , wherein the method further comprises sequestering SOx, mercury, or both. 
     
     
         25 . The method of  claim 22 , wherein the brine is a man-made brine or a natural brine. 
     
     
         26 . The method of  claim 25 , wherein the brine is a man-made brine comprising a geothermal plant wastewater or a desalination waste water. 
     
     
         27 . The method of  claim 25 , wherein the brine is a natural brine comprising a surface brine, a deep brine, or an alkaline lake. 
     
     
         28 . The method of  claim 25 , wherein producing the slurry from the CO 2 -charged solution comprises adjusting pH. 
     
     
         29 . The method of  claim 28 , wherein pH is adjusted to a pH below pH 8-9. 
     
     
         30 . The method of  claim 28 , wherein pH is adjusted to a pH above pH 9-10. 
     
     
         31 . The method of  claim 30 , wherein pH is adjusted to a pH above pH 11. 
     
     
         32 . The method according to  claim 28 , wherein pH is adjusted by a process comprising adding a base to the water. 
     
     
         33 . The method of  claim 32 , wherein the base is hydroxide. 
     
     
         34 . The method of  claim 33 , wherein the hydroxide is produced in an electrochemical process. 
     
     
         35 . The method of  claim 34 , wherein the electrochemical process comprises a chloralkali process. 
     
     
         36 . The method of  claim 34 , wherein the hydroxide is produced by applying a voltage across an anode and a cathode. 
     
     
         37 . The method of  claim 36 , wherein the voltage applied across the anode and the cathode is less than 2.8 V. 
     
     
         38 . The method of  claim 37 , wherein the voltage applied across the anode and the cathode is less than 2.0 V. 
     
     
         39 . The method of  claim 38 , wherein the voltage applied across the anode and the cathode is less than 1.5 V. 
     
     
         40 . The method of  claim 39 , wherein the voltage applied across the anode and the cathode is less than 1.0 V. 
     
     
         41 . The method of  claim 21 , wherein the slurry further comprises strontium. 
     
     
         42 . The method of  claim 41 , wherein the slurry comprises strontium at 3-10,000 ppm. 
     
     
         43 . A method of sequestering carbon dioxide from a gaseous waste stream of an industrial plant, comprising:
 a) preparing a sodium hydroxide solution in an electrochemical process;   b) charging brine with the gaseous waste stream to produce a CO 2 -charged solution; and   c) using the sodium hydroxide solution in a process adapted to produce a precipitate comprising a metal carbonate, metal bicarbonate, or combination thereof from the CO 2 -charged solution.   
     
     
         44 . A method of sequestering carbon dioxide from a gaseous waste stream of an industrial plant, comprising:
 a) preparing a sodium hydroxide solution in an electrochemical process;   b) charging seawater with the gaseous waste stream to produce a CO 2 -charged solution; and   c) using the sodium hydroxide solution to produce a precipitate comprising a metal carbonate, metal bicarbonate, or combination thereof, from the CO 2 -charged solution.