Sewage treatment plant layout
Sewage treatment plant component
Diffuser layout
Mechanical aerator drawings
SD-03 Product Data
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NOTE: Delete reference to mechanical aerator when
step aeration type or complete mixing type is
specified, or when not allowed for extended aeration
type. Mechanical aerator may not be suitable for
use in areas having prolonged periods of
sub-freezing temperatures when spray may form
accumulation of ice. Consideration should be given
to temperature and detention time of the liquid and
freeboard in the tank in determining temperatures
that may be tolerated. Mechanical aerator is not
suitable for extended aeration type where eventual
conversion to step aeration is contemplated.
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NOTE: Delete reference to comminutor when not
required for plant. For plants of 1.09 L/s 25,000
GPD capacity and below, the comminutor and bar
screen unit may be omitted, and in lieu thereof, a
screening basket provided in the aeration tank. For
installations in which all sewage has passed through
a comminutor and bar screen upstream of the plant, a
comminutor and bar screen unit need not be provided
as a part of the plant equipment.
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NOTE: Delete reference either to chlorinator or
hypochlorinator. Hypochlorinator should be
specified for all plants 4.38 L/s 100,000 GPD
capacity and below. Chlorinator should be specified
for all plants 6.57 L/s 150,000 GPD capacity and
above. Between 4.38 L/s and 6.57 L/s 100,000 GPD
and 150,000 GPD capacity either is suitable.
Selection should be made on basis of existing
station or base practices, local availability, and
comparative costs.
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Air blower
Air diffusers
[
Mechanical aerator]
Spray nozzles
Pump
SECTION 11375N
Page 14
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