SSR20240408A02 Anaerobic Digester Didactic Equipment

SSR20240408A02 Anaerobic Digester Didactic Equipment

Description

The trainer demonstrates the biological anaerobic water treatment. The trainer consists basically of two units:

– stirring tank with secondary clarifier

– UASB reactor

Both units can be used separately or in combination. This allows both a single stage and a dual stage operation mode. In the dual stage operation a pump first transports the raw water into a stirred tank. In this tank the acidification of the organic substances dissolved in the raw water takes place. Here, anaerobic microorganisms convert the long-chain organic substances into short-chain organic substances. In a secondary clarifier the biomass discharged from the stirred tank is separated from the water. The separated biomass is pumped back into the stirring tank.

From the secondary clarifier the raw water pretreated in this manner reaches a UASB reactor (UASB: Upflow Anaerobic Sludge Blanket). Here the final step of the anaerobic degradation takes place. The previously formed short-chain substances are converted by special microorganisms into biogas (methane and carbon dioxide). Flow through the UASB reactor is from the bottom to the top. At the top of the UASB reactor there is a separation system. This separates the generated gas from the treated water. It also ensures that the biomass remains in the reactor. The gas can be discharged externally or collected. The treated water exits at the top end of the reactor and is collected in a tank.

To adjust the flow velocity in the UASB reactor a of the treated water can be recirculated.

The temperatures in the stirred tank and the UASB reactor can be controlled. The pH value in the stirred tank is measured. In addition, the pH value in the UASB reactor can be controlled. A software and webcam are available for data acquisition and visual inspection.

Anaerobic biomass and analysis technology are required to perform the experiments. Recommended parameters are: COD (chemical oxygen demand), nitrogen and phosphor.

Technical details

A benchtop anaerobic digester for wastewater treatment studies

Equipped with two 5l packed bed, upward-flow reactors

Each reactor has gas sampling & collection facilities

Reactors may be operated in series or parallel flow arrangement, using variable-speed peristaltic pumps

* Feed flow rate to each reactor can be accurately and independently controlled to any temperature between ambient and 55°C, using 200W heating jackets

Thermostatic cut-out set to 110°C

An instruction manual describing test and practical work capabilities, including details of a proven feedstock (synthetic wastewater) is included.

Reactors: Two, identical -Nominal capacity: 5 liters -Packed volume: 4 liter’s 150mm diameter x 250 mm height

Reactor packing: 25mm diameter Bio-balls Temperature control: For each reactor: 200W heating jacket with PID control from a temperature sensor positioned inside the reactor, set point within range ambient to 55°C, the jacket is thermostatically protected by a cut-out set at 85°C.

Feed pumps: Two identical peristaltic pumps: variable speed using 10 turn potentiometer to 4rpm supplied with three tube diameters, 1.6, 3.2 and 4.0mm, flow rates from 0.2 to 5.8 l/day

Gas collection vessels: Two, identical – linear scale, 0-5 liter capacity