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MIXING, COAGULATION, AND FLOCCULATION 6.17

CHLORINE FEED
PLANT INLET PIPE
2 MIXING PUMPS
COAGULANT CHEMICAL FEED
MIXING ZONE "-~'--
G = I000 SEC-I _L..__
L

WEIRS TO FLOCCULATION~ / / ~TAPERED CHANNELS
B A S I N ~ L~____.. V:0.35 M/S MAX.

FLOCCULATION DEPARTMENTS(4) ~ REEL FLOCCULATOR TYI~
G MAX. 50 SEC. "J (4 EA. BASIN)

el.
BAFFLES "u.
(TYR) r,-
>
CLARIFIERS
CLARIFIERS

SEE DESIGN CRITERIA TABLE 5.2
HORIZONTAL PADDLE [ REEL') FLOCCULATORS
TWO BASIN DESIGN, FOUR COMPARTMENTS
EA. BAS[N BAFFLED DESIGN.

SCALE 0 ?- 4 6 8 I0 20 METERS
i
0 IO 20 30 40 50 FEET
FIGURE 6.8 Partial plan for mixing and flocculation facilities [368 ML/day (97 mgd)].

tion at 20 ° C are summarized in Table 6.6. Floc size and density should be matched to
subsequent settling and filtration stages.

Types of Flocculators

Flocculation can be achieved by hydraulic methods or mechanical devices. Hydraulic
methods are used most often in small plants. Mechanical flocculators cover a broad range
of configurations.