Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1995-07-21
1996-07-30
Lithgow, Thomas M.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210712, 210776, 210805, 210196, 210202, 2102212, 210295, C02F 124, C02F 900, B01D 3600
Patent
active
055408443
ABSTRACT:
Apparatus and method is described for dewatering sludge obtained from a flotation tank, which efficiently handles the sludge and avoids the need for adding polymers to reflock the sludge. The sludge dewatering portion includes a conveyor (40, FIG. 1) which has an uppath portion (42) that receives sludge that is dropped over a cliff (32), the conveyor having a downpath portion (44) which firmly compresses the sludge as it continues to move along the conveyor. The conveyor preferably extends at an incline to the horizontal with the downpath portion lying higher than the uppath portion, and with a fluid conduit lying under the conveyor and carrying liquid downwardly along the incline to a pump (74) that pumps the liquid along a return conduit (80) back to the flotation tank. One conveyor includes an elongated shaft (50, FIG. 2) with a screw (54) or spiral conveyor fixed to the shaft, with a large diameter uppath screw portion (55) that receives the dropped sludge and a smaller diameter downpath screw portion (62), and with the uppath screw portion being of smaller diameter and being substantially completely enclosed to compress the sludge thereat.
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Finn Patrick J.
Meylor Donald M.
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