Vacuum Sewer - Advantages

Advantages

  • closed, pneumatically controlled system with a central vacuum station. Electrical energy is only needed at this central station
  • no sedimentation due to self-cleansing high velocities
  • spooling and maintenance of the sewer lines is not necessary
  • manholes are not required
  • Usually only a single vacuum pump station is required rather than multiple stations found in gravity and low pressure networks. This frees up land, reduces energy costs and reduces operational costs.
  • investment costs can be reduced up to 50% due to simple trenching at shallow depths, close to surface
  • flexibility of piping, obstacles (as open channels) can be over- or underpassed
  • reduced installation time
  • small diameter sewer pipes of HDPE, PVC materials; savings of material costs
  • aeration of sewage, less development of H2S, with its dangers for workers, inhabitants, as well as corrosion of the pipes may be avoided; sewage is kept fresh
  • no odours along the closed vacuum sewers
  • no infiltration, less hydraulic load at treatment station and discharge sewers
  • absolutely no leakages (vacuum avoids exfiltration)
  • sewers may be laid in the same trench with other mains, also with potable water or storm-water, as well as in water protection areas
  • Lower cost to maintain in the long term due to shallow trenching and easy identification of problems
  • In combination of vacuum toilets it creates concentrated waste streams, which makes it feasible to use different waste water treatment techniques, like anaerobic treatment

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