CO2 sequestration system and CO2 sequestration method

Abstract

To provide a CO2 fixation system and a CO2 fixation method capable of reducing a discharge of CO2 and suitably treating unused ready-mixed concrete.SOLUTION: A CO2 fixation system 1 according to an embodiment comprises: water injection means 3 injecting water W into unused ready-mixed concrete C; a vibration sifter 5 receiving the unused ready-mixed concrete C injected with the water W by the water injection means 3 from a ready-mixed concrete truck 2 to separate an aggregate C1 from the ready-mixed concrete C; a tank 6 located below the vibration sifter 5; a stirring machine 7 provided at the inside of the tank 6 and stirring the ready-mixed concrete C fell down from the vibration sifter 5 to modify the ready-mixed concrete C into a slurry shape; piping 8 extending from the tank 6; and a turbid water treatment facility 10 having a raw water tank receiving the slurry-shaped ready-mixed concrete C from the tank 6 via the piping 8 and subjecting the slurry-shaped ready-concrete C to solid-liquid separation. The turbid water treatment facility 10 feeds carbon dioxide to the ready-mixed concrete C received by the raw water tank to fix the carbon dioxide to the ready-mixed concrete C.SELECTED DRAWING: Figure 1