Method for surcharging with sand the sludge layer of a tar...

Details Method for surcharging with sand the sludge layer of a tar... Method for surcharging with sand the sludge layer of a tar...

C - Chemistry, Metallurgy

10

G

196/24

C10G 1/04 (2006.01) C02F 11/16 (2006.01) C02F 11/20 (2006.01)

Patent

CA 1134310

ABSTRACT OF THE DISCLOSURE In order to surcharge the sludge layer of industrial process tailings ponds with sand to effect dewatering of the sludge, which sludge has been treated with hydrolyzed starch flocculant, at least two tailings ponds are employed in the system. A first pond receives the process effluent and in- cludes a fines-containing sludge layer. During summer months, sludge is transferred from the first pond to a second pond. During the winter months, the second pond is allowed to freeze over. Sand is distributed on the ice surface of this pond such that, upon spring thaw, the sand is deposited in a sub- stantially uniform layer over the sludge layer. The process may be repeated annually or as needed to obtain multiple sand surcharge layers interleaved with layers of treated, highly dewatered sludge in the second pond.

338921

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