types
of
trickling
filters
are
of
stone
per
capita.
Desirable
standard or low rate, and high rate.
hydraulic head between the lowest
The application of sewage at higher
liquid level in the dosing chamber and
rates and the recirculation of a
the center of the rotary distributor
portion of the effluent constitute the
arm is 10 to 12 inches. If sprinkler
principal
difference
between
the
nozzles are used, head should be
operation of a high rate filter and
sufficient to discharge the maximum
that of a standard rate filter.
flow at the low water level in the
dosing tank.
This usually requires a
(1) Design procedure.
The size
6- to 10-foot head from the high water
of the filter bed is determined on the
level in the dosing tank to the
basis
of
about
0.35
cubic
yard
Figure 8.
Trickling filter.
4-10
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