Reference solutions for local authorities – Viala-du-Tarn (81)

Problem:

 

  • Municipality of 410 p.e.
  • Regulatory obligation to purify effluents:
    • Daily flow rate: 65 m3/d
    • Peak hourly flow rate: 8 m3/h
  • Separate network

 

 Solution:

 

Bio-disc treatment system:

  • 1 line of biodiscs composed of 2 modules – 2,951 m²
  • Clarification by 1 lamellar settling tank
  • Storage, stabilization and dewatering of sludge on reed beds: 4 compartments – 80 m²

In operation since 2009

 

 Results:

 

Rejection standards to be respected:

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