Figure 2.
Settling tank.
material settles to the bottom.
As
capita for plants that return the
the depth of sludge increases, the
sludge.
In tropical climates or in
solids in the bottom compact.
Thus
installations
having
sludge-heating
the sludge in the tank varies greatly
facilities,
tank
capacity
may
be
in fluidity from top to bottom.
The
reduced to two-thirds of the above
rate
at
which
digestion
and
the
volumes.
Sludge tanks are preferably
resulting changes in fluidity take
15 to 25 feet deep, but practical
place
depends
on
temperature
and
considerations may limit the depth to
alkalinity.
10 to 15 feet.
(1) Capacities.
Separate sludge
(2) Design. The simplest type of
digestion tanks should provide 3 cubic
digestion tank is an uncovered earth
feet per capita in plants that do not
basin
which
receives
the
settled
return the sludge from final settling
sludge from the settling tank by
tanks either to the plain settling
gravity
flow.
Digested
sludge
tank
or
directly
to
the
sludge
is drawn off at the bottom, which
digestion tank and 4.5 cubic feet per
4-4
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