Deposit discharge system and method of discharging deposit

摘要

A deposit discharge system comprises: a discharge tube having a suction port opened so as to face a water bottom face of a water storing place on which deposits are deposited, a straight tube part extending upward from the suction port, and a discharge port communicating with the straight tube part and opened on the downstream side of the water storing place for draining the deposits together with water stream; a crane device suspending a whole main tube part of the discharge tube positioned in the water storing place in a state of being submerged and having a vertical moving mechanism vertically moving the suction port; and an air valve provided in the discharge tube for controlling introduction and exhaust of air from the discharge tube by opening and closing operation, wherein the discharge tube is installed so as to pass, when the deposits are discharged, through a dam banking in the water storing place routing a position lower than a water level of the water storing place.