Patent ID: 8298415

Claim:
A wastewater treatment ship comprising: a hull able to navigate by being towed or by being self-propelled; and a purification treatment unit disposed in said hull so as to collect and purify wastewater; wherein said purification treatment unit comprising: a raw wastewater tank to house wastewater; a floated oil collecting tank to house floated oil collected from said raw wastewater tank; a stirring tank having a cylindrical straight drum and a funnel-shaped bottom to stir a coagulant together with wastewater taken out from said raw wastewater tank, wherein precipitates formed in said stirring tank are collected via a collection path connected to said bottom; a plurality of filtering treatment tanks to be used in processes of multi-stage filtering treatment performed on wastewater in said stirring tank; and purified water tanks to house purified water having undergone said filtering treatment; wherein said raw wastewater tank is disposed at a center of said hull in a manner to surround said stirring tank and wherein said floated oil collecting tank and said purified water tanks are both disposed on a first side of said raw wastewater tank in a first direction where said first direction is either in a direction toward a stern of the hull or in a direction toward a stem of the hull, and wherein said plurality of filtering treatment tanks is disposed on a second side of said raw wastewater tank in a second direction, where said second direction is opposite of said first direction, such that said raw wastewater tank is disposed between said floated oil collecting tank and said purified water tanks on said first side and the plurality of filtering treatment tanks on said second side.