Thermophilic sludge digestion and advanced nutrient treatment: Perfect fits for sustainable sewage treatment

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Conventional sewage treatment

  • Sludge line:
    • 20 kg DM IE-1 year1 to sludge
    • Sludge treatment and disposal: 40% of STP opex
  • Electricity:
    • Overall STP consumption: 33 kWh IE-1 year1
    • Recovery with mesophilic (30-35°C) anaerobic digestion (AD)
    • The Netherlands: -50% of sludge digested, producing 8.9 kWh IE-1 year
  • Nutrients: practically no recovery
    • (Müller and Kobel, 2004, Korresp Abwasser; Aquafin, 2010, Annual report; Senternovem, 2010, Inventory Biogas WWTP; Milieu et al., 2008, Report Sewage sludge on land; Zessner et al., 2010, Wat Sci Technol)

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