Patent ID: 7470365

Claim:
An apparatus for sludge concentration by mixing sludge and coagulant, comprising: an external casing to define therein an inner space; a cylindrical structure placed within the inner space of the external casing, wherein a plurality of ring-shaped stationary disks and movable disks are alternately laminated and gaps are defined between the movable disks and the stationary disks and the plurality of stationary disks are integrated with one another into a single body; a sludge inlet line and a coagulant inlet line connected to a lower portion of the external casing so that the sludge and the coagulant flows into a first space between the external casing and the cylindrical structure; an agitator rotating and moving in the first space, thereby inducing mixing the sludge and the coagulant; a rotating bar connected to a main shaft rotating the agitator and moving the plurality of the moving disks, thereby removing flocs which are stuck between the gaps; a flocs discharge line connected to an upper portion of the external casing and discharging flocs produced by the agitation and mixing of the sludge and the coagulant outside said external casing; and a supernatant discharge line extending to a second space formed within the cylindrical structure and discharging a supernatant produced by the agitation and mixing of the sludge and the coagulant which are flowing into the second space through the gaps of the cylindrical structure.