MIL-HDBK-1138
Table 6
Treatment Process Components Subject to Freezing Problems
Preliminary
Solids
Treatment
Clarifiers
Reactors
Management
Disinfection
Pumping
Primary
Activated
Digestion
Chlorination
sludge
Screens
Secondary
Extended
Dewatering
aeration
Polishing
Oxidation
Disposal
ponds
ditches
Grit chamber
Air
Trickling
flotation
filters
Flow
Thickeners
Rotary
measurement
contactors
Flow
Aerated
lagoons
Facultative
lagoons
Source:
U.S. Army CRREL Special Report 85-11
Table 7
Winter Problems with Preliminary Treatment
Problem
Solution
Ice buildup in headworks area
Keep building heated above
50F (10C).
Icing of bar racks
Cover inlet channel.
Flush with warm water.
Weatherstrip channels to
reduce cold air entry into
building.
Clean by hand frequently.
Septage pumping lines freeze
Use heat tape on lines and
valves.
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