Anarobic Digester Description and Specifications for Lab Tenders
Anarobic Digester The Anaerobic Digester is comprised of two 1.3 gallon upward flow packed
bed reactors, with feed rate and temperature controls to allow steady,
continuous operation at up to 1.1 gallons per day.
The reactors may be
operated in series or parallel. A buffer vessel between the reactors
permits discharge of excess flow from the first reactor when the second
reactor is operated in series, but at a lower flow rate. The flow rates
to the vessels are set and controlled by peristaltic pumps. The
temperature of each reactor is controlled by an electric heating tape
wrapped around the external wall. The temperature distribution within
each reactor is maintained to ±1°F. Reactor temperatures may be
separately set at any desired value in the range ambient to 131°F. The
gas off-take from each reactor is taken to a volumetrically calibrated
collector vessel operating by water displacement. A constant head,
liquid seal device ensures that the gas pressure in the reactor is
maintained at a constant value throughout the test run. The collected
gas can be exhausted from the vessel and the volume refilled with water
during a run, without breaking the liquid seal. Liquid and gas sampling
points are located at all strategic points around the reactors.
equipment is mounted on a steel base with an integral barrier to cope
with spillage and wash down. The base is finished in instrument tan
texture enamel. The control panel is finished in gloss white enamel and
silk screened in KEM black enamel.
Two identical reactors—nominal capacity, 1.3 gal.; packed volume, 1.1 gal.; 6.25" ID diameter by 10" high.
1" diameter bio-balls.
each reactor—836W heating jacket with PID control from a temperature
sensor positioned inside the reactor, set point within range ambient to
131°F; the jacket is thermostatically protected by a cutout set at
Range: 0.00 - 14.00
Two identical peristaltic pumps—variable speed using a potentiometer to 12 rpm, with flow rates from 0.04 to 1.1 gal. per day.
Gas collection vessels
Two identical—linear scale, 0–1.3 gal. capacity
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