Patent FR-2897610-A1 (FR)
Title: Water treatment device to eliminate granular material from ballasted muds, comprises water supply unit to treat water towards mixing zone, injection unit to inject flocculate reactive agent in mixing zone, and decantation zone
Inventor: SAUVIGNET PHILIPPE
IPC: C02F1/52
Filed: 2006-02-20
Abstract: The water treatment device to eliminate granular material from ballasted muds, comprises a water supply unit to treat water towards mixing zone, an injection unit to inject flocculate reactive agent in the mixing zone, a decantation zone (5), an evacuation unit for mixture of granular material and mud, an evacuation unit to evacuate clarified water from the decantation zone, an evacuation unit for excess mud, which is separated by the separation unit, and a trapping device for granular material fixed on the evacuation unit of mud. The water treatment device to eliminate granular material from ballasted muds, comprises a water supply unit to treat water towards mixing zone, an injection unit to inject flocculate reactive agent in the mixing zone, a decantation zone (5), an evacuation unit for mixture of granular material and mud, an evacuation unit to evacuate clarified water from the decantation zone, an evacuation unit for excess mud, which is separated by the separation unit, and a trapping device for granular material fixed on the evacuation unit of mud. The injection unit of the fine granular material is denser than water forming ballast in the mixing zone. The muds are formed in the decantation zone towards a separation unit of granular material. A first recycling unit is useful to recycle the granular material, which is separated by separation unit towards the mixing zone, and a second recycling unit is useful to recycle the granular material, which is trapped by the trapping unit towards the mixing zone. The trapping unit for granular material, comprises a vertical body, a supply unit of mud from the separation unit fixed with about half a height of the vertical body, a bottom of the vertical body, which forms a funnel and an evacuation unit for clean mud in which the supply unit is arranged tangentially to the separation unit. The evacuation unit for clean muds is fixed in an upper and a lower part of a cylindrical body (21). The trapping device comprises an evacuation unit for overflows, fixed in the upper part of the cylindrical body, and a recycling unit to recycle the overflows towards the mixing zone. The bottom of the vertical body is conical/truncated. A generator angle of bottom of the vertical body with a horizontal angle is 45-60[deg]. The trapping device is equipped with a valve (25), which controls a communication between an interior of trapping device and the second recycling unit, and a vibrating wave sensor of the granular material present in the cylindrical body according to the granular material mass. The vibrating wave sensor has ultrasounds or infrared probe. The water treatment device is equipped with an automatic opening device by valve, which is turned over according to a temporal grid or to a data recorded by the sensor. An independent claim is included for a procedure for implementing an installation.