Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1985-07-31
1986-06-03
Castel, Benoit
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210519, 210208, 210525, 210528, C02F 152
Patent
active
045928452
ABSTRACT:
The present invention provides a sludge belt method of clarifying a liquid charged with solid material. After a flocculation additive has been added thereto, the charged liquid is conveyed to the bottom of a sludge belt in a clarification chamber (40) via a plurality of injectors (76) spread out over the area of said chamber. The total flow rate through said injectors is evenly distributed between the injectors by an internal head loss. The clarified liquid is removed via an upper overflow (72). Each injector forms jets diverging from its vertical axis, so that the injected flow spreads out over an expansion zone belonging to said injector and meeting the expansion zones of adjacent injectors. In addition, the jets drive vortices which prevent the formation of a layer of sludge having insufficient permeability.
REFERENCES:
patent: 2380252 (1945-07-01), McBride
patent: 3313725 (1967-04-01), Koh Tsuda et al.
patent: 3850810 (1974-11-01), Teodoroiv
patent: 4054514 (1977-10-01), Oltmann
patent: 4278541 (1981-07-01), Eis et al.
patent: 4390429 (1983-06-01), Lejeune et al.
Berthod Louis
Lejeune Pierre
Alsthom-Atlantique
Castel Benoit
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