Aerobic Digester

Model HV-EXP1730
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  process..          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). The 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. Dissolved oxygen and pH probes and meters are included.The reactor lid contains a gas exit port, suitable for sampling the gases for subsequent analysis Specifications Feed 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     Chemical Engineering Laboratory lab equipment manufacturers,exporters and Chemical Engineering Laboratory Lab suppliers