BALLAST WATER TREATMENT DEVICE

摘要

In order to obtain a ballast water treatment device which enables the efficient and effective cleaning of a cylindrical filter for performing filtration treatment on ballast water that has flowed thereinto and discharging the ballast water to the outside, and achieves a simple configuration, and easy manufacturing and maintenance, a ballast water treatment device in which a cylindrical filter (2) for performing filtration treatment on ballast water that has flowed thereinto and discharging the ballast water to the outside is disposed in a casing (1) is provided with: a filter rotation means (3) which rotates the filter (2) about the axis thereof; a suction nozzle (4) which is provided on the primary side of the filer (2), is open to the inner peripheral surface of the filter (2), and always performs suctioning from the whole area in the axial direction of the filter (2); a cleaning waste water discharge means (5) which discharges cleaning waste water sucked by the suction nozzle (4) from the casing (1) to the outside; a differential pressure detection means (8) which detects a differential pressure between the primary side and the secondary side of the filter (2); and a control means (9) which controls the number of rotations of the filter (2) on the basis of the differential pressure detected by the differential pressure detection means (8).