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

  • Familiarization with anaerobic water treatment
  • Effects of temperature, pH, and rH value on anaerobic degradation
  • Functional principle of a UASB reactor
  • Monitoring and optimization of the operating conditions
  • Identification of the following influencing factors
    *sludge loading
    *volumetric loading
    *flow velocity in the UASB reactor
  • Purification efficiency versus the following parameters:
    * recycle ratio * residence time
    * digester temperature * organic load * pH and rH
  • Automatic PID control (optional)
  • Plant Supervision


  • The framework of stainless steel with castors
  • The process flow diagram is in front of the panel.
  • Feed tank of stainless steel
  • Anaerobic digester of stainless steel, equipped with an oil heating system
  • Electronic thermostat for control of heating temperature
  • K-type thermocouple installed for controlling temperature in digester
  • Feed pump for wastewater
  • Recycle pump for sludge
  • Agitation through air compressor with no return valve and air filter
  • Flowmeters for feed and recirculation of wastewater and sludge respectively
  •  Flowmeter for air agitation
  • Microprocessor-controlled pH-meter & rH-meter (Optional)
  • Differential pressure transmitter for maintaining pressure in digester
  • Solenoid valve along with needle valve for controlling pressure in the digester
  • Electronic feed flow rate transmitter with electronic indicator and analog output signal if DAQ selected
  • Electronic sludge recirculation flow rate transmitter with electronic indicator and analog output signal if
    DAQ selected (Optional)
  • Emergency push button

Organic materials degrade anaerobically when there is no oxygen present. The organic materials are broken down because the anaerobic microbes feed on them. This generates biogas, which is mostly composed of methane (60%) and carbon dioxide (35%). The raw water is first moved into a stirred tank by a feed pump. The acidity of the organic materials dissolved in the raw water occurs in this tank. Long-chain organic compounds are changed into short-chain organic compounds in this situation by anaerobic microbes. The biomass that is released from the stirred tank is separated from the water in a secondary clarifier. The separated biomass can be pumped back into the stirring tank using a recirculation pump. Raw water that has undergone this pretreatment flows from the secondary clarifier to a UASB reactor (UASB: Up-flow Anaerobic Sludge Blanket). This is where the anaerobic degradation process ends. Special bacteria transform the previously generated short-chain compounds into biogas (methane and carbon dioxide).

The UASB reactor has a bottom-to-top flow pattern. The UASB reactor has a separation system at the top. By doing this, the produced gas and the cleaned water are separated. Additionally, it makes sure the biomass stays inside the reactor. The gas can either be stored or released outside. The reactor’s top end is where the treated water leaves and is collected in a tank. To adjust the flow velocity in the UASB reactor the treated water can be recirculated. It is possible to regulate the temperatures in the stirred tank and the UASB reactor. The pH and rH values in the stirred tank are measured.