Acidic gas absorbent, acidic gas removal method and acidic gas removal apparatus

An acidic gas removal apparatus comprising:

• an absorption unit in which a gas containing an acidic gas is brought into contact with an acidic gas absorbent containing an amine compound and water, so that the absorbent absorbs the acidic gas to remove it from the acidic gas-containing gas;
• a superfine bubble-introducing unit in which superfine bubble containing inert gas wherein an average diameter of said superfine bubble is 150 nm or less are introduced into said acidic gas absorbent;
• and
• a regeneration unit in which the absorbent holding the acidic gas is made to release the acidic gas so as to be regenerated;
• so that the absorbent regenerated in the regeneration unit is reused in the absorption unit.