CO2 mineralization in produced and industrial effluent water by pH-swing carbonation
Effluent water is combined with carbon dioxide sourced from a carbon dioxide-containing emission stream to produce a reaction solution. The pH of the reaction solution is controlled to induce precipitation of a carbonate salt from the reaction solution.
1. A method comprising:
combining effluent water with carbon dioxide sourced from a carbon dioxide-containing emission stream to produce a reaction solution; and
controlling the pH of the reaction solution with a regenerable heterogeneous pH buffer agent to induce precipitation of a carbonate salt from the reaction solution, wherein the regenerable heterogeneous pH buffer agent is a clay to support ion exchange reaction, or a polymer-supported buffer agent.
2. The method of claim 1 , wherein the method further comprises regenerating the regenerable heterogeneous pH buffer agent.
3. The method of claim 1 , wherein controlling the pH includes increasing the pH of the reaction solution.
4. The method of claim 1 , wherein controlling the pH includes adjusting the pH of the reaction solution to 6 or greater.
5. The method of claim 1 , wherein controlling the pH includes adjusting the pH of the reaction solution to 6.5 or greater.
6. The method of claim 1 , further comprising, subsequent to the precipitation of the carbonate salt, recovering the heterogeneous pH buffer agent by filtration.
7. The method of claim 1 , wherein the carbon dioxide-containing emission stream is a flue gas stream.
8. A method comprising:
combining effluent water with carbon dioxide sourced from a carbon dioxide-containing emission stream to produce a reaction solution; and
inducing precipitation of a carbonate salt from the reaction solution in the presence of a regenerable heterogeneous pH buffer agent, wherein the regenerable heterogeneous pH buffer agent is a clay to support ion exchange reaction, or a polymer-supported buffer agent.
9. The method of claim 8 , further comprising, subsequent to the precipitation of the carbonate salt, recovering the regenerable heterogeneous pH buffer agent by filtration.
10. The method of claim 8 , wherein inducing the precipitation of the carbonate salt includes controlling the pH of the reaction solution using the regenerable heterogeneous pH buffer agent.
11. The method of claim 8 , wherein the carbon dioxide-containing emission stream is a flue gas stream.