A blast treatment device comprising: - an injection part having at least one nozzle , the at least one nozzle being adapted to inject media (M) toward a workpiece (W) made of a composite material, there being a weight difference between the media (M) and resinic particles dropping from the composite material which allows separation of the media (M) from the resinic particles, the media (M) being injected by compressed air; and - a first tank coupled to the at least one nozzle by a first hose , the first tank being adapted to supply the media (M) to the at least one nozzle , the media (M) being supplied by the compressed air; - a movement structure that is adapted to move the at least one nozzle and the first tank in directions including a vertical direction and a horizontal direction; - a second tank that is adapted to supply the media (M) to the first tank , the second tank being configured not to be moved by the movement structure , the second tank being coupled to the first tank by a second hose having a detachable mechanism , the second hose being detached while the movement structure move the at least one nozzle and the first tank in order to inject the media (M) toward the workpiece (W); and - a circulating system that is adapted to recover the injected media (M) and supply the recovered media (M) to the injection part , - wherein the circulating system has an impurity separation part having a cyclone separator that is adapted to remove impurities included in the recovered media (M) and a vibrational sieving machine that is adapted to remove media (M), of which particle sizes have become small, included in the recovered media (M). - an injection part having at least one nozzle , the at least one nozzle being adapted to inject media (M) toward a workpiece (W) made of a composite material, there being a weight difference between the media (M) and resinic particles dropping from the composite material which allows separation of the media (M) from the resinic particles, the media (M) being injected by compressed air; and - a first tank coupled to the at least one nozzle by a first hose , the first tank being adapted to supply the media (M) to the at least one nozzle , the media (M) being supplied by the compressed air; - a movement structure that is adapted to move the at least one nozzle and the first tank in directions including a vertical direction and a horizontal direction; - a second tank that is adapted to supply the media (M) to the first tank , the second tank being configured not to be moved by the movement structure , the second tank being coupled to the first tank by a second hose having a detachable mechanism , the second hose being detached while the movement structure move the at least one nozzle and the first tank in order to inject the media (M) toward the workpiece (W); and - a circulating system that is adapted to recover the injected media (M) and supply the recovered media (M) to the injection part , - wherein the circulating system has an impurity separation part having a cyclone separator that is adapted to remove impurities included in the recovered media (M) and a vibrational sieving machine that is adapted to remove media (M), of which particle sizes have become small, included in the recovered media (M). <EOS>