Process and apparatus for dehydrating waste solids concentrates

Details Process and apparatus for dehydrating waste solids concentrates Process and apparatus for dehydrating waste solids concentrates

1982-03-09

1983-03-22

Castel, Benoit

Concentrating evaporators

Miscellaneous

159 17R, 159 473, 210771, 210774, 210806, 2101953, B01D 126

Patent

active

RE0311855

ABSTRACT:
An apparatus and process for dehydrating waste solids concentrates including secondary and digested sewage sludges and those concentrates prone to form emulsions upon the addition of oil are obtained and accomplished by mixing the sludge or other concentrate with fluidizing oil prior to dehydration by heat evaporation to maintain pumpability; recycling a portion of the substantially anhydrous waste solids and oil evaporator output slurry, and admixing it with the fluidizing oil and input sludge or concentrate to regulate the solids content and viscosity of the steady state feed mixture and thereby prevent fouling of the evaporator heat transfer surfaces and convert emulsions to suspensions.

REFERENCES:
patent: Re26317 (1967-12-01), Greenfield
patent: 1955064 (1934-04-01), Hawley
patent: 3323575 (1967-06-01), Greenfield
patent: 4007094 (1977-02-01), Greenfield
patent: 4097378 (1978-06-01), St. Clair
patent: 4125465 (1978-11-01), Turovsky et al.
patent: 4196077 (1980-04-01), Berkowitz et al.

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