Ballast water treatment system for ship
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United States of America Patent
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Jun 27, 2017
Grant Date -
Jun 26, 2014
app pub date -
Feb 8, 2013
filing date -
Feb 24, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
Provided are a system and a method for treating ballast water for a ship, the system including a rotary filtration apparatus including a filter that is cylindrically formed so as to surround an axis, that is rotatable around the axis, and that has a pleated shape that is folded in a cylinder radial direction; and an electric motor for rotating the filter. A distance between the cleaning nozzle and a recess of the filter is 120 mm or less. The system and the method are configured to perform a steady-state operation that satisfies the following conditions a to d:
- a) a rotation speed of the filter during a filtering operation is in the range of 20 to 100 rpm,b) a flow speed of cleaning water ejected from the cleaning nozzle is 250 m/min or more,c) a flow rate of filtered water per unit area of the filter is 5.1 m/h or less, andd) a flow rate of discharged water discharged from the discharge channel is 5% of the flow rate of filtered water or more.
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