The purpose of flocculation is to uniformly mix coagulated
water to produce either settleable or filterable floc and accelerate the rate of
particle collisions, causing the agglomeration of electrolytically destabilized
colloidal particles into settleable and filterable sizes.
Considerations
of flocculation are: 1.Baffling to prevent of flow
short-circuiting 2.Tapered mixing energy to control of floc size (high to low
to prevent flocs breakage)
(1)The structure of flocculator There are
five types of flocculator. We choose mechanical mixing type with vertical shaft
with hydrofoil impellers. Hydrofoil impeller is a low cost alternative to
propellers. Vertical impeller flocculator has high energy efficiency (it means
less power is required) and has low shear stress (lower variation in G). Also it
can compact flocs well and has less settling problem at the bottom. Direction of
water flow by impeller rotation must be down to prevent settling, and motor is
on the top of the tank for easy maintenance.
본문내용 igned water
treatment plant based on conventional water treatment system we learned in this
semester. Figure 2 is our final design proposal. Explain details about our water
treatment process in this writing. Figure 1 Conventional water treatment
process Figure 2 Design proposal Ⅱ Flash mix The purpose of flash mix
is to rapidly, uniformly, and efficiently distribute coagulant chemicals into
the p
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