Percent Solids Content
Location and Sludge Type Freezing Freezing
Wastewater sludge, with alum 0.7 18
Water treatment, with iron salts 7.6 36
Water treatment, with alum 3.3 27 Ontario, Canada
Waste-activated sludge 0.6 17
Anaerobically digested 5.1 26
Aerobically digested 2.2 21 Hanover, New Hampshire
Digested, wastewater sludge, with alum 2-7 25-35
Digested primary 3-8 30-35
Source: Data from Farrell(1970), Reed et al. (1984), Rush and Strickland (1979), and Schleppenbach (1983).
used for preliminary estimates, but the final design should be based on actual weather records for the site and the calculation procedure described earlier.
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