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6.19
MIXING, COAGULATION, AND FLOCCULATION

Flocculation basin
and shaft bearings
Variable-speed-
q_
drive assembly
Drive base

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Baffle
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Limit of swing
Limit of swing
FIGURE 6.10 Oscillating flocculator. (Courtesy ofDorr-Oliver Eimco.)

in the same direction around the shaft. Leakage from packing glands has occurred in some
horizontal shaft units.
The type of mechanical flocculator influences the shape of flocculation compartments.
Vertical flocculators are often associated with square compartments with maximum di-
mensions of approximately 20 ft (6 m) square and depths of 10 to 16 ft (3 to 5 m). Hor-
izontal shaft, reel, or paddle flocculator compartments are often 20 to I00 ft (6 to 30 m)
long and 10 to 16 ft (3 to 5 m) wide.