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Low DO value in the aeration basin

Symptoms

  • Efficiency reduction

  • DO reduction in the aeration basin; and temporary bulking

  • Mixed liquor dark colour

Main causes

  • Insufficient aeration

  • Wide oscillation of the organic loading rate

Investigations and analyses

  • Measure DO concentration in the aeration basin specially in the dead zones

  • Measure wastewater flow rate and organic concentration during peak time

Remedial actions

  • Increase the volume of the aeration basin (raising the water level)

  • Increase the aeration

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