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Gravel trap

  • Two channels
  • Length: 12 m each
  • Width: 5 m each
  • Bottom depression: 1.5 m
  • The grit chamber removes around 10 to 15 tonnes of solids from wastewater per week.
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Screw pump facility

  • 6 screw pumps
  • Screw length: 13 m
  • Screw diameter: 3.25 m
  • Speed: 18 or 27 r.p.m.
  • Pumping capacity: 3 - 4.5 m³/sec each
  • Delivery head: 5.5 m
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Screening plant

  • 6 fine screens
  • Width: 3 m each
  • Screen bar openings: 6 mm
  • Water depth at screen during low flow: approx. 1.3 m
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Sand trap

  • 6 tanks
  • Length: 48 m
  • Channel width: 4 m each
  • Water depth: 3.6 m
  • Total volume: 4,320 m³
  • Total surface: 1,150 m²
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Primary sedimentation

  • 8 tanks
  • Length: 74 m
  • Tank width: 16 m each
  • Depth: 3 m
  • Total surface: 9,500 m ²
  • Total volume: 28,416 m³
  • Primary sludge scrapers with blades
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Aeration tanks - stage 1

  • 4 tanks with 5 cascades each
  • Length: 84 m
  • Tank width: 48 m each
  • Depth: 2.6 m
  • Total surface: 16,150 m²
  • Total volume: 42,000 m³
  • Oxygen intake through 32 centrifugal aerators
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Intermediate sedimentation

  • 16 tanks
  • Length: 74 m
  • Tank width: 24 m each
  • Depth: 2.3 m
  • Total surface: 65,400 m²
  • Total volume: 65,360 m³
  • Removal of sewage sludge by scrapers
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Intermediate pumping station

  • 8 wastewater pumps
  • Delivery head: 5,2 m
  • Capacity: 2.6 m³/sec each
  • 6 pumps for return sludge
  • Delivery head: 4 m
  • Capacity: 2.7 m³/sec each
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Aeration tanks - stage 2

  • 15 tanks
  • Lenght: 79 m
  • Width: 33 m each
  • Depth: approx. 5.5 m
  • Total volume: 171,000 m³
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Final clarification

  • 15 tanks
  • Inner diameter: 64 m
  • Mean depth: 4.1 m
  • Total surface: 43,500 m²
  • Total volume: 200,000 m³
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Sludge thickening tanks

Primary and excess sludge end up in the sludge thickening tanks, where they are thickened by gravity to a dry matter content of approximately 4%. The combined sludge is then pumped through underground pipes to the sludge treatment unit at Simmeringer Haide (operator: Wien Energie). After centrifugal dewatering, the sewage sludge is incinerated at a temperature of 850°C in fluidised bed furnaces.

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Analysis building

Online measurement of:

  • pH value
  • Temperature
  • Conductivity
  • Nitrate
  • Solids
  • Ammonia
  • Phosphate
  • Total phosphorus
  • TOC
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