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San Colombano - Florence

Process: Activated Sludge

Duration of the project: 2001 - 2010

Client: Publiacqua S.p.A.

The waste Water treatment plant is located on the left bank of the river Arno and it is part of a large environmental project interesting an area around Florence of 200 hectares and serving eight municipalities.

Capacity
600,000 Inhabitants Equivalent
Design dry weather flow
237,600 m3/d (66.6 MIGD)
Design wet weather flow
529,632 m3/d (308 MIGD)
Daily BOD5
36,000 kg/d
Daily COD
75,000 kg/d

 

Sewage treatment

  • Coarse screening 20 mm and fine screening at 3 mm
  • Aerated Degritting with grease removal (number 6 chambers each for 540 m3)
  • Primary Clarification (number 3 circular basins, 59 m diameter)
  • Biological selector
  • Anoxic/Denitrification basins (number 3 basins each of 24,000 m3)
  • Aerated/Nitrification basins (number 3 basins each of 8,000 m3)
  • Secondary Clarification (number 9 circular basins  55 m diameter)
  • Disinfection

Sludge treatment

  • Thickening by centrifuges
  • Two stage Anaerobic Digestion (number 6 digesters 4,500 m3 each)
  • Sludge dewatering by centrifuges