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SBR

SBRs, (Sequencing Batch Reactors) is a biological treatment system for culture in suspension through activated mud whereby waste water is introduced in batches into the reactor, where it is treated and later discharged.

This means that by using the same reactor but changing its operations we can fulfil different treatment objectives: eliminate organic matter, organic matter and nitrogen, organic matter and phosphorous, and organic matter, nitrogen and phosphorous.


These systems are characteristic for their easy control and flexibility as they allow us to simply control the time dedicated to each stage of the process. At each stage we establish certain environmental conditions. To modify the period employed in each stage, we only need to set the controls that connect and disconnect the pumps and blowers.
 

In most cases, SBR operation is in five sequential stages: filling, reaction, sedimentation, emptying and phase of inactivity.

  • Filling.  

At this stage the base water is introduced into the reactor. The SBR looks after opening and closing valves. Filling can be done aerobically or anaerobically, depending on desired effects.

  • Reaction.

At this stage volumes in the reactor are at maximum levels and everything is completely stirred up. Depending on the strategy for its use, we can choose aerobic or anaerobic phases.
At this stage the sludge is purged and its age is determined. All this usually lasts from 1.5 to 4 hours. 

  • Desilting. 

Once we have finished with the reactor phase, the system disconnects the aerating and stirring mechanisms and allows gravity to desilt the sludge. The period of desilting depends on the characteristics of the sludge but usually lasts between 30 minutes and 1 hour. 

  • Emptying. 

This is when we extract the effluent from the tank. 

  • Inactivity. 

This is the necessary phase between emptying and refilling the tank.
 

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