Liquid purification or separation – With means to add treating material – Directly applied to separator
Reexamination Certificate
2007-01-30
2007-01-30
Lithgow, Thomas M. (Department: 1724)
Liquid purification or separation
With means to add treating material
Directly applied to separator
C210S205000, C210S206000
Reexamination Certificate
active
10500564
ABSTRACT:
A water purification installation includes a coagulation area, a flocculation area, an area for mixing, in an upflow, the flocculated water with pressurised water which is delivered by a microbubble-generating pressurisation-pressure reduction system, and a flotation area. Suspended matter, which is brought to the surface by the microbubbles, is evacuated from the upper part of the flotation area. Moreover, the lower part of said flotation area includes means of collecting the clarified water. The geometry of the flotation area is such that the ratio between the height (H) of the area located above the clarified water collection means and the length (L) of the area is between 0.3 and 1; and the ratio between the surface (Sa) of the nappe at the outlet of the mixing area and the surface (Sp) of the actual flotation area is between 0.05 and 0.5 and, preferably, between 0.1 and 0.35.
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Dissolved Air Flotation in Drinking Water Production; Schofield T., Water Science and Technology, vol. 43, No. 8, pp. 9-18, 2001.
Water Treatment Handbook, Berne et al., Sixth English Edition, vol. 2, pp. 679-686, 1991.
Connolly Bove & Lodge & Hutz LLP
Degremont
Lithgow Thomas M.
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