Liquid purification or separation – With means to add treating material – With distinct reactor tank – trough or compartment
Patent
1990-06-22
1991-12-03
Silverman, Stanley S.
Liquid purification or separation
With means to add treating material
With distinct reactor tank, trough or compartment
210219, 210256, 210415, 2104331, B01D 2101, C02F 152
Patent
active
050697846
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a coagulation reaction tank which, by stirring sludge supplied thereto in combination with a coagulant by the use of rotary stirring means provided with stirring vanes, produces floc possessing ample strength even when the sludge is supplied in a low concentration.
2. Background Art
As a coagulation reaction tank of this class, Japanese Utility Model Public Disclosure SHO 62(1987)-48405 discloses one comprising a cylindrical tank, rotary stirring means disposed upright in the central part of the cylindrical tank, provided with stirring vanes, and adapted to stir sludge supplied thereto with a coagulant and convert the sludge into floc, and a filtration tank disposed concentrically in the upper internal part of above the cylindrical tank and adapted to draw in through the bottom thereof the liquid from within the cylindrical tank in the form of filtrate and discharge the filtrate out of the cylindrical tank (first conventional technique). Japanese Utility Model Public Disclosure SHO 62(1987)-118602 discloses a coagulation reaction tank which comprises a cylindrical tank and a filtration tank disposed concentrically in the upper internal part of the cylindrical tank and adapted to draw in the liquid from within the cylindrical tank in the form of filtrate through slits formed in a plurality of horizontal stages in the outer peripheral wall of the filtration tank and discharge the filtrate out of the cylindrical tank (second conventional technique).
Further, a coagulation reaction tank using a cylindrical tank and causing the liquid within the tank to be taken out in the form of filtrate from the upper part of the tank wall is disclosed in Japanese Utility Model Public Disclosure SHO 61(1986)-810 and SHO 61(1986)-811 (third conventional technique).
The conventional techniques are invariably capable of discharging filtrate containing substantially no floc from within a filtration tank and releasing floc of ample strength from a cylindrical tank. In the case of the first conventional technique, since the bottom of the filtration tank is formed with a punched plate or a netting, minute particles of the floc or minute fibrous particles entrained by the sludge clog the holes in the punched plate or the meshes of the netting.
As a solution, therefore, the rotary vanes of the stirring means are provided with a wiper such as brushes or rubber plates adapted to be rotated and rubbed against the upper and lower surfaces of the bottom of the filtration tank so as to sweep the bottom of the filtration tank. The wiper, however, fails to manifest a fully satisfactory cleaning effect because the fibrous particles entangle on the brushes or rubber plates. In the case of the second conventional technique, the minute particles of floc or the minute fibrous particles entrained by the sludge clog the multiplicity of horizontal slits in the outer peripheral wall of the filtration tank.
As a solution, the rotary shaft of the stirring means is provided with brushes attached radially thereto and adapted to rub the inner surface of the aforementioned outer peripheral wall and prevent the slits from the clogging. The brushes, however, fail to manifest fully satisfactory cleaning effect because the fibrous particles entangle on the brushes.
In the case of the third conventional technique, since vertical slits are formed in the tank wall, the fibrous particles in the sludge catch in the slits. As a solution, a rotating brush is brought into contact with the slits from outside the tank to clean the slits. The rotary brush, however, fails to manifest a fully satisfactory cleaning effect because the fibrous particles similarly entangle on the brush.
DISCLOSURE OF THE INVENTION
The present invention is characterized by the fact that the aforementioned filtration tank is disposed inside the cylindrical tank in such a manner that the bottom thereof falls above the region of rotation of the stirring vanes, the slits for drawing in the liquid from within the cylindrical tank in the fo
REFERENCES:
patent: 1639590 (1927-08-01), Corkran
patent: 1687428 (1928-10-01), Corkran
patent: 2181404 (1939-11-01), Koppitz et al.
patent: 2404215 (1946-07-01), Cavanaugh
patent: 2594785 (1952-04-01), Meeker
patent: 4155841 (1979-08-01), Chupka et al.
patent: 4931180 (1990-06-01), Darchambeau
Fujiwara Noboru
Koike Syuzo
Takeuchi Tadao
Taniguchi Naohiro
Watanabe Yasuhiko
Japan Sewage Works Agency
Kurita Water Industries Ltd.
Silverman Stanley S.
Upton Christopher
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