The process unit enables to develop and analyze the following issues:

  • Purification efficiency versus the following parameters:

* composition of water under to be treated
* residence time
* organic load
* pH in oxidation tank
* concentration of dissolved oxygen

  • Learning the fundamental principle of the activated sludge process
  • Functional principle of nitrification and pre-denitrification
  • Creation of a stable operating state
  • Identification of the following influencing factors
    * return sludge ratio               * reflux ratio of the internal recirculation
    * sludge age                              * sludge loading
    * volumetric loading               * oxygen concentration and temperature
  • Efficiency of the pre-denitrification
  • Screen mirroring: mirroring of the user interface on end devices
    * Menu navigation independent of the user interface shown on the touch screen
    * Different user levels available on the end device: for observing the experiments or for operation and control


  • Framework of stainless steel with castors
  • Process flow diagram in front of panel.
  • Feed tank of stainless steel
  • Cylindrical oxidation reactor of stainless steel, with an inspection window of transparent methacrylate and three overflows at different heights to vary reactor volume
  • Agitator of stainless steel with geared motor
  • Settler of stainless steel, provided with inspection window of transparent methacrylate
  • Gear pumps (for feeding and recirculation), with body of stainless steel.
  • Air compressor for air diffusion in oxidation chamber
  • Air diffuser of sintered stainless steel
  • Flowmeter with valve for measuring air flow rate to oxidation reactor
  • Flowmeter with valve for measuring feed and recirculation flow rate to oxidation reactor
  • K-type thermocouple with digital temperature indicator
  • Microprocessor-type electronic dissolved oxygen indicator transmitter
  • Microprocessor-type electronic pH indicator-transmitter
  • Magnetic-induction flowmeters (for feeding and recirculation) with analog output signal (optional)
  • Digital indicator of feed flow rate (optional)
  • Digital indicator of sludge recycle flow rate (optional)

The activated sludge pilot plant consists of an oxidation reactor and a settler according to the traditional process of single stage sewage treatment process.

The most significant biological process in water treatment is the activated sludge process. This pilot plant enables this process to be demonstrated. The aeration tank receives raw water that has been contaminated with dissolved organic compounds (organic matter) via a pump. The organic matter is used as a source of nourishment by aerobic microorganisms (activated sludge) in the aeration tank, which in turn biodegrades it. The aeration tank aerates the raw water because aerobic microbes require oxygen to survive. The agitator stir the raw water and activated sludge together. The treated water is then settled away from the activated sludge in the secondary clarifier. The aeration tank receives some of the activated sludge back (return sludge). The cleaned water is put in a tank for storage. The studies call for activated sludge from a wastewater treatment facility and analysis equipment. The following parameters must be determined in order to analyses the experiments like organic matter BOD5 or COD or TOC, nitrogen concentrations, ammonium, nitrite and nitrate

Technical Data

Feed Tank

  • Capacity: 150L
  • Material: Stainless Steel

Oxidation Reactor

  • Capacity: 60L
  • Material: Stainless Steel
  • Stirrer speed: 0~300RPM

Settler tank

  • Capacity: 30L
  • Material: Stainless Steel

Air Compressor

  • Type: double acting piston
  • Purpose: air diffusion in oxidation chamber
  • Flow: 0~1200LPH


  • Type: Gear
  • Flow: 0~1LPM
  • Constrution: Stainless Steel
  • Quantity: 2 (one for feed and one for recirculation)


Feed flow and recirculation

  • Range: 0~1LPM
  • Quantity: 2

Air diffusion flow

  • Range: 0~1m3/h
  • Quantity: 1


  • pH: 0~14
  • DO: 0~100%

Measuring ranges

  • Flow rate: 0.5~7L/min (feed)
  • Flow rate: 0.5~7L/min (recycle)
  • Flow rate: 0~0~1m3/h (air)
  • Temperature: -100~400oC
  • pH: 0~14
  • Dissolve Oxygen: 0~100%

Software CT-3295SW (optional)

DAQ software specially designed in National Instrument™, LABVIEW™ environment to measure and calculate the results of apparatus. The software is optional and while using software a set of electronic sensors are included. Software can be run with any Windows™ environment.