Indirect heat drying and simultaneous pelletization of sludge

Details Indirect heat drying and simultaneous pelletization of sludge Indirect heat drying and simultaneous pelletization of sludge

1990-02-26

1991-12-03

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

34 11, 34 12, 34 13, 34237, 71 12, 71 13, 210771, B01D 3700

Patent

active

050698010

ABSTRACT:
Municipal sludge is dried in an indirect heating dryer to simultaneously dry and pelletize the sludge while preventing the escape of malodorous gases. The product exiting the dryer contains pelletized, undersized and oversized fractions. The dried product is classified to separate the undersized and oversized fractions from the pellets. The pellets are then cooled and stored for subsequent use as a fertilizer or fuel. The oversized fraction is crushed to obtain fines and mixed with the undersized fraction, which contains mostly fines. The fines are added to the liquid sludge before it is input to the dryer. The air that is used to cool the pellets, and that is used as sweep air in the dryer contains malodorous gases. In order to prevent the escape of these malodorous gases, the pellet cooling air and sweep air, which also includes the water vapor generated during the drying of the sludge, is deodorized by thermal treatment, preferably in a high temperature combustion zone.

REFERENCES:
patent: 2772642 (1956-12-01), Lindl
patent: 3728797 (1973-04-01), Worden, Sr. et al.
patent: 3963471 (1976-06-01), Hampton
patent: 4098006 (1978-07-01), Maffet
patent: 4761893 (1988-08-01), Glorioso
patent: 4829678 (1989-05-01), Glorioso
patent: 4852269 (1989-08-01), Glorioso
patent: 4860671 (1989-08-01), Glorioso
patent: 4974335 (1990-12-01), Bege et al.

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