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Problem:

• Municipality of 900 EH
• Regulatory obligation to purify effluents:
  • Daily flow rate: 261 m3/d
  • Peak hourly flow rate: 53 m3/h
• Unitary network

Solution:       

Bio-disc treatment system:

• Primary settling by 1 digester settling tank
• 2 rows of bio-discs composed of 2 modules – 2 x 2 593 m²
• Clarification by 2 lamellar decanters

In operation since 2009

Results:

Rejection standards to be respected:

• BOD5: 25 mg/l
• COD: 125 mg/l
• TSS: 35 mg/l