Dac apparatus

A DAC apparatus configured to recover CO2 in the atmosphere, comprising:

• an adsorption chamber provided with an adsorbent for adsorbing or absorbing CO2 and water;
• a vacuum pump for recovery connected with the adsorption chamber through vacuum piping for recovery and configured to suck desorption gas from the adsorbent;
• a vacuum pump for deaeration connected with the adsorption chamber through vacuum piping for deaeration and configured to suck residual atmosphere not absorbed to the adsorbent;
• a gas-liquid separator provided on the vacuum piping for recovery and configured to separate water from the desorption gas;
• a first water tank configured to store the water separated by the gas-liquid separator;
• a second water tank connected with the vacuum piping for deaeration;
• a communication passage communicating the first water tank with the second water tank;
• an on-off valve provided on the communication passage;
• and
• a controller configured to control the on-off valve for a water level of the first water tank to exceed a lower limit water level.