Aerobic Digester Description and Specifications for Lab Tenders
Aerobic Digester Aerobic Digester consists of a 2 gallon
reactor vessel mounted on a steel base, with a liquid feed pump, air
supply, and instrumentation for monitoring and controlling the
The cylindrical wall of the reactor is made from 2 layers of
porous plastic material to retain the suspended solids, while allowing
treated water to pass through to the outer, annular exit chamber.This
design allows the essential features of the aerobic treatment process to
be studied without the distractions of having to settle the solids
adequately enough for external recycle, a well known laboratory
problem.The porous liners are removable for cleaning, and a spare liner
is supplied.Waste water is drawn from a feed tank by a 120V motor driven
peristaltic pump. Flow rate is controlled by a variabe run time control
that determines the minutes of run time within a 10 minute cycle. The
pump delivers the feed to the reactor vessel through a transparent lid.
Air is supplied at a measured rate by a small air pump, and discharges
into the base of the reactor via an air distribution device. This
provides the necessary oxygen for the digestion process, as well as
produces sufficient bubbling for stirring and reaction. The liquid level
in the reactor is maintained at a constant value of 1 or 2 gal. by an
overflow device connected to the outer annular chamber of the vessel.
Discharge is by gravity to a floor-standing product tank (not supplied).
reactor temperature is maintained by a 3-term PID controller which
varies power to an immersion heater within the vessel. Any temperature
between ambient and 95°F may be selected, with the best conditions being
a few degrees above the diurnal maximum in the user’s laboratory.
oxygen and pH probes and meters are included.The reactor lid contains a
gas exit port, suitable for sampling the gases for subsequent analysis
pump 120V, peristaltic, 10 rpm, variable run time control corresponding
to 0–13 gal. per dayAir pump 240V/120V, 0–1.35 gpmReactor vessel 2 gal.
maxium capacitypH meter Range 0.00 to 14.00Dissolved oxygen meter Range
0–100% saturation, resolution 2%Reactor heater Electrical immersion
250WTemperature controller 3-term PID, temperature limit set at 95°F
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