Troubleshooting in Sequencing Batch Reactors SBR Wastewater Treatment Plants

Sequencing Batch Reactors SBR is a widespread technology for the treatment of Sewage and sometimes Effluent generated from Industries. Mainly SBR is used for Sewage Treatment Plants.


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Troubleshooting in Sequencing Batch Reactors SBR

Troubleshooting of SBR STP ETP addresses critical operational conditions faced by industrial operators mentioned below:

• Denitrification

• Nitrification

• High decant Biochemical Oxygen Demand BOD

• High decant Total Suspended Solids TSS

• Unwanted change in alkalinity and pH

• Foam and scum production

• Low DO dissolved oxygen


Nitrification

Nitrification is an aerobic (oxygen dependent) reaction that consumes DO dissolved oxygen. Troubleshooting of Nitrification is related to the

  • DO

  • pH and alkalinity

  • toxicity.

How toxicity is produced in SBR?

When ammonium is there in SBR at concentrations ≥ 480 mg/L, any one following two conditions occur resulting in the inhibition of nitrification:

  • The ammonium accumulates, and the pH of the SBR increases. This increase in pH results in the production of free ammonia (NH 3 ). Free ammonia is toxic.

  • The ammonium is quickly oxidized to nitrite, and free nitrous acid is produced in a large quantity. The production of nitrous acid results in a decrease in pH that accelerates the production of more nitrous acid. Free nitrous acid is toxic.

Troubleshooting of SBR for Nitrification is done via

  • MLSS correction

  • DO during react phase

  • pH

  • Phosphorus deficiency

Likewise other parameters are also rectified in SBR.


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