Patent ID: 8557122

Claim:
Ballast water treatment equipment for supplying ballast water to a ballast tank through a fungicide adding device, comprising: a shear flow generator put in an intake pipe from an intake opening to the ballast tank, and receiving ballast water from a high pressure pump; and a swirl flow generator connected to downstream of the shear flow generator with a connecting pipe; wherein the shear flow generator has one or more venturi tubes with recesses; each of said venturi tube with recess comprises an inlet side cross-sectional area reducing part gradually decreasing sectional area along a flow direction; an outlet side cross-sectional area enlarging part put in downstream of the inlet side cross-sectional area reducing part, and increasing cross-sectional area along the flow direction; a throat put between the inlet side cross-sectional area reducing part and the outlet side cross-sectional area enlarging part; and a shear flow generating recess opening to the throat; wherein the swirl flow generator has a cylinder that is connected to the connecting pipe of the shear flow generator; and a diffuser pipe having an inner circumference surface that is increasing in cross-sectional area along the flow direction and connected to the fungicide adding device.