Sludge Dewatering in Freezing Bedsby C. James Martel, U.S. Army Cold Regions Research and, Engineering Lab, Hanover, United States,
Abstract: This paper summarizes the results of laboratory and pilot scale studies on the development of the sludge freezing bed. Laboratory studies indicated that a freezing bed could dewater up to 2.0 m of typical water and wastewater sludges. Pilot plant results indicated that adequate drainage during thaw was critical for odor control. After thawing, the sludge was dry enough for removal with mechanical equipment. The cost of constructing a freezing bed was estimated to be considerably higher than that of an equivalent drying bed. However, this extra expense would be more than offset by higher loading rates and lower operation and maintenance costs.
Subject Headings: Laboratory tests | Sludge | Freezing | Bed materials | Maintenance | Dewatering | Sewage | Water management
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