Vacuum Sewer - Limitations

Limitations

  • vacuum systems are not capable of transporting sewage over very long distances, but can pump long distances from the vacuum station to the next STP or main gravity sewer.
  • vacuum sewerage systems are only capable for the collection of wastewater within a separated system (not for the collection of storm-water)
  • the lines can only reach up to 3–4 km laid in flat area (restrictions of the system due to headlosses (3-4.5 m) (friction and static))
  • systems should be designed with help of an experienced manufacturer (concepts are usually free of charge)
  • external energy is required at the central vacuum station. However, the collection pits do not require electrical energy.
  • odours close to the vacuum station can occur, a biofilter may be necessary
  • integrity of the pipe joints is paramount
  • grease can clog the sensor tube (if set up incorrectly) thus requiring preventative maintenance cleaning
  • mechanical controllers (float switches) require preventative maintenance for worn parts and seals
  • vacuum valves can get stuck open leading to pressure drops in the entire system. However, a monitoring system can help identifying stuck open valves immediately

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