System and method for removing harmful gas in discharged cleaning solution of exhaust gas treatment apparatus

A system for removing noxious gas from cleaning liquid discharged from an exhaust gas treatment apparatus, comprising:

• an exhaust gas treatment apparatus configured to receive exhaust gas generated by the combustion and flowing thereinto, remove noxious gas from the exhaust gas by spraying cleaning liquid to the exhaust gas, and discharge the sprayed cleaning liquid;
• a noxious gas removal unit connected to the exhaust gas treatment apparatus and configured to remove the noxious gas remaining in a gaseous state in the cleaning liquid discharged from the exhaust gas treatment apparatus and discharge the cleaning liquid from which the noxious gas in the gaseous state has been removed;
• a level measuring unit configured to measure a level of the cleaning liquid in the noxious gas removal unit;
• and
• a flow rate regulator configured to adjust a discharge rate of the cleaning liquid in the noxious gas removal unit on the basis of a result of measurement by the level measuring unit.