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5.2.2 Small Pressure Sewer
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5.2.2 Small Pressure Sewer

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When there is insufficient slope or the topography does not allow gravity flow to the treatment and/or disposal system, pressure sewers should be adopted to pump and convey the wastewater. Generally, raw wastewater from households firstly flows to a holding tank containing a pump and control devices. When the tank fills to a set point, the pump within the tank will pump wastewater into the sewers. Pressure sewer systems are expandable. A community may only install sewers for existing population, and it is feasible and reasonable to connect new cluster of homes to an existing sewer system as needed. The land area required for a pressure sewer system is determined by the area required for pump basin and the piping that connects it to the sewer main. Compared to gravity sewers, pressure sewers have smaller diameter pipes and shallower placement.

 

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Figure 5.2 Schematic of a pressurized sewer system

(Source: WERF, 2010)

 

Key design criteria of a pressure sewer system include:

 

  • Pressure mains generally use 50mm or larger PVC pipe and rubber-ring joints or solvent welding to assemble the pipe joints.
  • Discharge points must use drop inlets to minimize odors and corrosion.
  • Air release valves should be placed at high points in the sewer and vented to soil beds.

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