Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1977-05-27
1978-04-18
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 48, 210 54, 210 56, 260112R, C02B 120
Patent
active
040850447
ABSTRACT:
Improvements in the treatment of lime-sulfide unhairing wastes from both salt-cured and unsalted hides are provided. After undissolved lime is flocculated out of the waste of a salt-cured hide and the supernatant acidified to liberate hydrogen sulfide, the hydrogen sulfide is flashed off under reduced pressure at about from 100.degree. to 150.degree. F. The waste from unsalted hides is sparged with carbon dioxide prior to flocculation, the sparged waste is flocculated with a strongly cationic polyelectrolyte, and the hydrogen sulfide flashed off from the acidified supernatant liquid.
REFERENCES:
patent: 1263532 (1918-04-01), Cummings
patent: 4017391 (1977-04-01), Black
Komanowski et al., "Separation of Lime-Sulfide Effluent Components to Advance Their Use and Reuse", JALCA 71, pp. 229-230 (1976).
Cooper et al.; "Effect of Flocculants on the Sedimentation of Organic Solids in Tannery Unhairing Effluents" Proc. of the 29th Purdue Ind. Waste Conf., pp. 510-518 (1974).
Komanowsky Michael
Sinnamon Howard I.
Castel Benoit
Hart Charles N.
McConnell David G.
Scott William E.
Silverstein M. Howard
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