SEQUENCING BATCH REATOR (SBR)

1. Operating principle

The principle of sequencing batch reactor (SBR) wastewater treatment uses microorganisms attached to suspended solids, as in CAS, but the process is designed to run in operating cycles, each consisting of the following 5 steps: fill, react, aerate, settle and decant. The duration of each treatment cycle depends on the design.

2. Advantages

• The treatment process is simpler than AAO and CAS because the aerobic tank and the settling tank are merged into one tank, or the anoxic and aerobic tanks are merged into one tank, saving more space.
• Suitable for small-capacity projects or projects whose discharge happens at a fixed time of day.
• No need to recirculate sludge from the settling tank to the anoxic tank, or from the aerobic tank to the anoxic tank, which avoids washing out the microorganisms in the aeration tank.
• Effluent quality is better controlled than with CAS/AAO because a defined volume of wastewater can be controlled batch by batch.
• Saves some equipment compared with a continuous treatment process

3. Disadvantages

• The treatment process is difficult to control and requires highly skilled operators to monitor the treatment steps frequently.
• There is a risk that producing wastewater may lead to sludge deposits, causing floating scum.
• Because the sludge settling tank is combined with the aeration tank, the sludge concentration can reach a high threshold and may clog the air blower.
• Not suitable for large-capacity projects that discharge continuously throughout the day.

Businesses interested in sequencing batch reactor (SBR) wastewater treatment technology are welcome to contact NGO at +84 24 7300 0890 or by email at office@8ngo.com for direct consultation.

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