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Products  |  Process Engineering  |  Water Treatment  |  CE 705
CE 705 Activated Sludge Process Show data sheet (pdf file) Print page
CE 705 - A product from the GUNT 2E range
Technical Description

  The activated sludge process is the most important biological process in water treatment. CE 705 enables this process to be demonstrated.
  A pump delivers raw water contaminated with dissolved organic substances (organic matter) into the aeration tank. Aerobic microorganisms (activated sludge) in the aeration tank use the organic matter as a source of nutrition, biodegrading it in the process. Since aerobic microorganisms need oxygen, the raw water is aerated in the aeration tank. The activated sludge is mixed with the raw water by  stirring machines. In the secondary clarifier the activated sludge is then separated from the treated water by sedimentation. A portion of the activated sludge is returned to the aeration tank (return sludge). The treated water is collected in a tank.

  It is also possible to convert ammonium into nitrate (nitrification) and nitrate into nitrogen (denitrification). For denitrification a zone without aeration can be created in the aeration tank by installing a partition wall.
  The following flow rates are adjustable: raw water, return sludge, internal recirculation for pre-denitrification and air. Oxygen concentration, pH-value and temperature can be contolled.

  A software program is provided to display the operation states and measure data. A process schematic shows the current operating states of the individual components and the measured data.

  Samples can be taken at all relevant points. Activated sludge from a wastewater treatment plant and analysis technology are required for the

the experiments. Recommended parameters are:

- BOD5 (biochemical oxygen demand)

- COD (chemical oxygen demand)

- NH4 (ammonium)

- NO3 (nitrate)


  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Learning the fundamental principle of the activated

  sludge process
- Functional principle of nitrification and pre-


- Creation of a stable operating state

- Identification of the following influencing factors
  * return sludge ratio

  * return ratio of the internal recirculation

  * sludge age

  * sludge loading

  * volumetric loading

  * oxygen concentration, pH value and temperature

- Efficiency of the pre-denitrification


* Wastewater treatment plant in laboratory scale1

* Aerobic biological degradation of organic

* Nitrification and pre-denitrification

Aerobic Processes

[1] Biological wastewater treatment

[2] Aeration tank with 3 stirring machines

[3] Secondary clarifier
[4] Nitrification and pre-denitrification
[5] Separate supply unit with 2 stirring machines
[6] All relevant flow rates adjustable
[7] Control of temperature, pH value and oxygen concentration

[8] Measurement of flow rate, temperature, pH value and oxygen concentration
[9] LabVIEW software with display of the operation states and data acquisition via USB under Windows XP or Windows Vista

[10] Visual inspection with webcam on PC


Technical Data

Aeration tank
- l x w x h: 800x420x240mm

- capacity: 75L
Secondary clarifier
- l x w x h: 500x500x515mm
- capacity: approx. 40L
- raw water: 200L
- treated water: 80L
Pumps for raw water and return sludge

- max. flow rate: each 25L/h
- max. head: each 10m
Stirring machines
- max speed: each 600min-1

Measuring ranges
- flow rate (raw water): 2...25L/h
- flow rate (compressed air): 50...550L/h
- temperature: 0...50C
- pH value: 1...14
- oxygen concentration: 0...10mg/L


Dimensions and Weight

l x w x h: 1550x790x1150mm (supply unit)

l x w x h: 2900x790x1900mm (trainer)
Weight: approx. 480kg

Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Scope of Delivery

1 trainer
1 supply unit

1 set of hoses
1 LabVIEW software CD + USB cable

1 webcam

1 measuring cup
1 stopwatch
1 beaker
1 set of instructional material

Order Details

083.70500  CE 705  Activated Sludge Process

© 2005 G.U.N.T. Gerätebau GmbH