Liquid purification or separation – Flow – fluid pressure or material level – responsive – Diverse sensing means
Patent
1990-07-30
1992-04-07
Silverman, Stanley S.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Diverse sensing means
210123, 210199, 210202, 210206, 210265, 210275, B01D 2124, B01D 2416
Patent
active
051025353
ABSTRACT:
Plant to precipitate suspended matter out of water, such as surface run-off water, industrial waste water, biologically treated waste water and landfill leachates with in-pipe flocculation, a filter filled with granular filter material situated above the sedimentation tank of the plant the direction of flow through which is from top to bottom and a backwash tank and whose subsequent sedimentation and filtration stages comprise the following features: that the backwash tank for filtered water is situated above the filter; that a float seals off an aperture with an enlargened cross-section connecting the filter with the backwash tank in a position raised by buoyancy; that a bypass directs the treated filtered water past the float to the backwash tank if the said aperture is closed off; and that the sludge outflow pipe in the floor of the sedimentation tank and the sludge valve in the sludge outflow pipe are directed against gravity to such an extent that when the sludge valve in the sludge outflow pipe is opened a volume of a fluid which is a mixture of water and the granular filter material and which is equivalent to the bulk volume of the granular filter material remains in the sedimentation tank.
REFERENCES:
patent: 1433357 (1922-10-01), Ellis
patent: 3480542 (1969-11-01), Bucksteeg et al.
patent: 3931009 (1976-01-01), Davis
Popovics Robert James
Silverman Stanley S.
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