AEROBIC DIGESTER APPARATUS

About AEROBIC DIGESTER APPARATUS

Specification:

AEROBIC DIGESTER APPARATUS

Aerobic Digester consists of a 2gallon reactor vessel mounted on a steel base, with a liquid feed pump, airsupply, and instrumentation for monitoring and controlling the process.

The cylindrical wall of the reactoris made from 2 layers of porous plastic material to retain the suspendedsolids, while allowing treated water to pass through to the outer, annular exitchamber.

This design allows the essentialfeatures of the aerobic treatment process to be studied without thedistractions of having to settle the solids adequately enough for externalrecycle, a well-known laboratory problem.

The porous liners are removable forcleaning, and a spare liner is supplied. Waste water is drawn from a feed tankby a 120V motor driven peristaltic pump.

Flow rate is controlled by a variaberun time control that determines the minutes of run time within a 10 minutecycle. The pump delivers the feed to the reactor vessel through a transparentlid.

Air is supplied at a measured rate bya small air pump, and discharges into the base of the reactor via an airdistribution device.

This provides the necessary oxygenfor the digestion process, as well as produces sufficient bubbling for stirringand reaction.

The liquid level in the reactor ismaintained at a constant value of 1 or 2 gal. by an overflow device connectedto the outer annular chamber of the vessel.

Discharge is by gravity to afloor-standing product tank (not supplied).

The reactor temperature is maintainedby a 3-term PID controller which varies power to an immersion heater within thevessel.

Any temperature between ambient and95F may be selected, with the best conditions being a few degrees above thediurnal maximum in the user™s laboratory.

Dissolved oxygen and pH probes andmeters are included. The reactor lid contains a gas exit port, suitable forsampling the gases for subsequent analysis

Feed pump 120V, peristaltic, 10 rpm,variable run time control corresponding to 0“13 gal. Per day Air pump240V/120V, 0“1.35 gpm Reactor vessel 2 gal. maximum capacity pH meter Range0.00 to 14.00 Dissolved oxygen meter Range 0“100% saturation, resolution2%Reactor heater

Electrical immersion 250WTemperaturecontroller 3-term PID, temperature limit set at 95F