Liquid purification or separation – Processes – Separating
Patent
1991-12-02
1993-06-01
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
34 11, 34 12, 34 13, 34 73, 34 78, 34 79, 71 12, 71 13, 71 6402, 209659, C02F 102, C02F 1112, B01D 3700
Patent
active
052156702
ABSTRACT:
Dewatered municipal sludge is dried and simultaneously pelletized in an indirect dryer. A sweep air is introduced into the dryer to extract a water vapor and air mixture. The water vapor and air mixture is condensed and cleaned in a condensor and a scrubber to obtain a clean non-condensable gas. The non-condensable gas is heated and recycled to the dryer after heating for use as the sweep air. Since air leakage into the system is inevitable, an excess amount of air accumulates that does not need to be recycled to the dryer. The excess amount of air is diverted from the recycled sweep air and thermally treated to destroy any malodorous gaseous constituents contained therein. Preferably, the indirect dryer is a horizontal drum dryer that is heated by the hot flue gases from a combustion furnace. The condenser for condensing the water vapor and sweep air mixture extracted from the dryer is cooled by the liquid sludge entering the dewatering treatment phase of the process, and the waste flue gas from the furnace is used to heat the recycled sweep air in order to save energy by recovering waste heat of the system.
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Bio Gro Systems, Inc.
Dawson Robert A.
Kim Sun Uk
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