Sequencing batch reactor is treatment tank by biological method by continuous batch reaction process in the same tank

1. Operating principle of sequencing batch reactor

Treatment of wastewater by microorganisms tack on suspended solids such as CAS, but the process is designed by operating cycles, each cycle consisting of 5 steps: water supply, agitation, aeration, sedimentation and water discharge. Duration of each treatment cycle (called batches) depending on design.

2. Advantages

  • Process is simplier than AAO or CAS beccause aeration tank and settling tank are merged into one tank, OR anoxic tank and aerobic tank are merged into one tank, save more space
  • Suitable for small capacity projects or projects that waste water only discharge during a certain imeslot in a day
  • No need sludge return from settling tank to Aerobic tank, or from aerobic tank to anoxic tank, avoid microbial leaching in the aeration tank.
  • Quality of produce water can be controlled better than CAS AAO because the amound and loading of waste water can be controlled by batch
  • Saving some equipment compared to continuous treatment process

3. Disadvantages

  • Control the process is difficult, requiring the operator to have higher qualifications to regularly monitor the processing of steps
  • There is a risk that produced waste water may come with muds of hard deposit characteristic, cause floating scum
  • Because sludge settling tank is combined with aeration tank, sludge concentration may reach high and cause air blower’s block
  • Not suitable for projects with large capacity, and discharge continously thorough the day


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