System and method for capturing carbon dioxide from a humidity adjusted air stream

A system for capturing carbon dioxide from a humid-adjusted air stream, wherein the system comprising:

• a carbon dioxide capturing unit comprising a humidity/temperature adjusting unit that comprises an evaporative cooling unit and a CO2 adsorbing unit, wherein the carbon dioxide adsorbing unit comprises a sorbent column made of polyamine-Cu (II) complex resin, wherein the humidity/temperature adjusting unit is configured to (a) enhance the humidity of the air stream by utilizing the air stream for evaporative cooling in the evaporative cooling unit to obtain a high humidity-low temperature air stream and (b) adjust the humidity of the high humidity-low temperature air stream as appropriate by drawing additional air and mixing the additional air with the high humidity-low temperature air stream, wherein the air stream comprises a humidity of about 75 to 95% and the humidity-adjusted air stream comprises a humidity of about 50 to 75%, wherein the CO2 adsorbing unit is configured to receive the humidity-adjusted air stream from the humidity/temperature adjusting unit and allow the humidity-adjusted air stream to pass through the sorbent column to selectively adsorb the CO2 from the humidity-adjusted air stream, thereby capturing the CO2 from the humidity-adjusted air stream, wherein the sorbent column is regenerated to separate the adsorbed CO2 from the sorbent column by (a) passing a source of NaCl to the sorbent column and displacing the captured CO2 in the resin with chloride (cl—) ion and releasing the captured CO2 in the NaCl solution as a bicarbonate ion (HCO3-);
• and (b) passing an alkaline stream to the sorbent column upon passing the source of NaCl, thereby replacing the chloride species (Cl—) in the resin with hydroxide ion (OH—);
• wherein the polyamine-Cu (II) complex resin is Polyam-N-Cu2+ resin;
• wherein the sorbent column is regenerated using NaOH produced through electro-dialysis of NaCl in a bipolar Electro-dialysis reversal (EDR) unit;
• and wherein the spent NaCl solution comprising adsorbed CO2 as a bicarbonate ion (HCO3-) is used to regenerating resins of a water softening unit comprising a Strong Acid Cation (SAC) resin unit and a Weak Acid Cation (WAC) resin unit.