Sequential Batch Reactor (SBR)

Sequential Batch Reactor (SBR)

SBR type STP works on the principle of batch treatment of the sewage. Sewage is collected & fed to the reactor in 4 or 5 batches. Air is supplied & the completed aerobic process takes 2 hrs per batch. Once aeration is finished, the sewage comes to a stand-still position so that all suspended solids settle at the bottom thus clarifying the water. Clarified water is then decanted out to be collected in the clarified water tank. This water is further disinfected, filtered & stored or drained.


SBR has following features:


  • Automatic operation of the reactor controlled by a PLC
  • Single Tank Operation
  • No media addition / replacement
  • Intermittent operation so less maintenance
  • Low sludge yield, typically once in 10-12 days
  • Possible in open, underground & basements
  • Water can be reused for gardening & flushing