Acidic gas recovery apparatus and acidic gas recovery method

An acidic gas recovery apparatus comprising:

• an acidic gas absorption unit configured to bring a gas to be treated containing an acidic gas into contact with an acidic gas absorbent containing an alkaline substance, and allow said acidic gas absorbent to absorb at least a part of said acidic gas to discharge a rich acidic gas absorbent that has absorbed said acidic gas and said gas to be treated from which said acidic gas has been removed;
• and
• a regeneration unit configured to regenerate said acidic gas absorbent by transferring an anion derived from said acidic gas contained in the rich acidic gas absorbent to an acidic gas recovery liquid containing an acidic substance, wherein
• said acidic gas absorption unit and said regeneration unit are connected so that said acidic gas absorbent circulates, and
• said regeneration unit includes, between a cathode and an anode facing each other, an acidic gas absorbent compartment, an acidic gas recovery liquid compartment, and a membrane disposed between said acidic gas absorbent compartment and said acidic gas recovery liquid compartment, said membrane being selected from a cation exchange membrane, an anion exchange membrane, or a bipolar membrane, and regenerates said acidic gas absorbent by electrodialysis to transfer and separate said anion derived from said acidic gas from said acidic gas absorbent introduced into said acidic gas absorbent compartment to said acidic gas recovery liquid introduced into said acidic gas recovery liquid compartment.