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Air diffusers clogging

Symptoms

  • Air flow rate reduction

  • Increased headloss in the air line



Main causes

  • High dust content in the air

  • Oil content in the air due to air compressor faulty operation

  • Rust presence in the air pipeline due to the condensing moisture

  • Organic material growth or solids precipitation over air diffusers

  • Solid deposition over air diffusers during aeration interruption



Investigations and analyses

  • Check the dust, rust and oil content in the air flowing to the diffusers

  • Check breaks presence in the air pipeline through which mixed liquor could enter during aeration interruption



Remedial actions

  • Keep air compressors as much regularly operated as possible

  • Check regularly the air filtration system

  • Install oil trap on the air compressor

  • Periodical maintenance of the air pipeline

  • Enhance degritting and screening

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