The energy factory - producing energy, nutrients and clean water from sewage water

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Courtesy of Colsen International b.v.

Conventional sewage treatment:

Sludge line:

  • 20 kg DM IE year to sludge;
    • 1.500.000 tons sludge per year
  • Sludge treatment and disposal: 40% of STP opex
    • average cost € 330 / ton sludge (incl. dewatering and processing costs)

Traditional (mesophilic ) sludge digestion:

  • Prim. sludge / sec. sludge = 50 : 50
  • Hydraulic Retention Time 20 days
  • Average yield: 25 – 40% odm conversion

Sewage treatment of the future:

  • Thermophilic sludge digestion:
    • Tests indicate 60 – 70% odm conversion

Anticipated results

  • More biogas produced
  • Less digested sludge to be processed
  • Lower operational costs
  • More nutrients (N/P) in digestate
  • More H2S in biogas
  • Lower sludge disposal quantity

Technical need for

  • HRT of 18 – 20 days
  • Optimal mixing
  • Strict temperature control

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