Carbon dioxide treatment apparatus, carbon dioxide treatment method and method of producing carbon compound

A carbon dioxide treatment apparatus comprising:

• a capturing device that captures carbon dioxide;
• and
• an electrochemical reaction device that electrochemically reduces the carbon dioxide captured by the capturing device,
• the electrochemical reaction device including:
• a cathode;
• an anode;
• an electrolyte membrane that is provided between the cathode and the anode;
• a cathode-side liquid flow path which is provided adjacent to the cathode and through which an electrolytic solution flows;
• an anode-side liquid now path which is provided adjacent to the anode and through which the electrolytic solution flows;
• and,
• a first liquid supply path that supplies, to the anode-side liquid flow path, the electrolytic solution which has flowed through the cathode-side liquid flow path,
• wherein the electrolytic solution flowing through the anode-side liquid flow path consists only of the electrolytic solution that has passed through the cathode-side liquid flow path and been supplied via the first liquid supply path.