Sequential Batch Reactor (SBR)

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Sequencing Batch Reactor

Sequencing batch reactor is true batch process where fill, aeration, settle and decant steps are carried out in a sequences of batches in a single basin.

Screened, de-gritted sewage is fed into SBR basins for biological treatment to remove COD, BOD, suspended solids, biological nitrogen and phosphorous.

SBR process works in a batch mode in single step.

It performs biological organic removal, nitrification, denitrification and biological phosphorous removal.

Advantages & Disadvantages Of SBR

Advantages :

  • SBR system can be designed with the ability to treat a wide range of influent volumes whereas the continuous system is based upon a fixed influent flow rate. Thus, there is a degree of flexibility associated with working in a time rather than in a space sequence.
  • SBRs produce sludge’s with good settling properties providing the influent wastewater is admitted into the aeration in a controlled manner.
  • Working with automated control reduces the number of operator skill and attention requirement.
  • Lesser Foot prints.
  • The duration, oxygen concentration, and mixing in these periods could be altered according to the needs of the particular treatment plant.

Disadvantages :

  • Appropriate aeration and decanting is essential for the correct operations of these plants.
  • The aerator should make the oxygen readily available to the microorganisms.
  • The decanter should avoid the intake of floating matter from the tank.

Features Of SBR

  • Smaller footprint because of absence of primary, secondary clarifiers.
  • Biological nutrient removal.
  • High degree of sludge removal.
  • Less chlorine dosing required for post disinfection.
  • Ability to withstand hydraulic and organic shock loads.

Flow Diagram Of SBR

Moving Bed Bio Reactor

This process is based on bio film of organisms developed on carrier elements.

This media is floating in the aeration tank and kept floating by air from diffusers which are placed at the bottom of the tank.

The process is intended to enhance the activated sludge process by providing greater biomass in aeration tank and thus by reducing volume of tank.

After aeration tank sedimentation tank is provided for settlement of sloughed biomass.

Clear water clarifier overflows from weir and it is further subjected to disinfection.

Advantages & Disadvantages Of MBBR

Advantages :

  • It is efficient, compact and easy to operate.
  • It can be an excellent solution, since it is a standalone process.

Disadvantages :

  • Continuous monitoring is required.
  • We may get some dead mass in clear supernatant which increase the filter load.

Features Of MBBR

  • Smaller footprint.
  • Flexible design that allows for increased capacity.
  • Single pass treatment.
  • Stable under large variations.
  • Extremely compact and simple biological treatment system.