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
Read more about this topic: Vacuum Sewer
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