Sequencing Batch Reactor (SBR) Technology

1. Sequencing Batch Reactor (SBR) is an activated sludge biological treatment process. The process uses natural bacteria and when the bacteria are aerated, they grow and multiply using the organics or "pollution" as food. This purifies the wastewater before it is discharged to the environment.
2. The process is managed in a fill and draw, or batch fashion. This process allows for exceptional flexibility and control which results in a highly treated effluent that will not harm the environment when it is discharged. Generally the SBR process can be conveniently described in five distinct steps:
3. STEP 1: Fill/React
   The treatment Reactor contains bacteria or biomass that processes the wastewater. The cycle starts with the Reactor at least half full of activated sludge. When the wastewater enters the Reactor, air is intermittently supplied by a blower, to maintain an aerobic (air enriched) environment. The pollution in the wastewater is consumed by the biomass as food. The biomass grows and multiplies during this treatment process assuring the system is sustained for further treatment. This cycle of filling and intermittent aeration continues until the Reactor has filled.
4. STEP 2: React OnlyDuring this step incoming wastewater is diverted to a second Reactor or is stored. The full Reactor is aerated or mixed continuously during this step. The React Only step provides time for additional treatment or "polishing" of the wastewater to meet required discharge consents. The duration of the react only step is easily adjusted at the computerised control panel.
5. STEP 3: SettleThe biomass in the Reactor must be separated from the treated liquid or supernatant, so there will be sufficient biomass remaining for treatment of the next batch of wastewater. In the SBR system the Reactor becomes the settling device or clarifier when all the pumps and blowers are turned off. This creates quiescent settling conditions to allow the biomass and the treated liquid to separate. After settling, the treated clarified liquid is discharged or decanted from the Reactor.