Introduction

• Vacuum sewerage systems is method of disposing of sewage in the sophisticated and reliable way.
• Alternative way of sewage disposal.
• Wide applications is future.

Vacuum Sewerage Systems

• Vacuum sewerage system works due to differential air pressure.
• Working of vacuum sewerage system.

1. Based on differential air pressure.
2. Interface valves works pneumatically.

The Component

• The main elements of vacuum sewerage system are:

1. Collection chambers Interface Units.
2. Vacuum lines/Hydro-pneumatic Transport.
3. Vacuum Station.

Collection Chambers/Interface Units

• Function of collection chamber and interface units.
• Addition of air.
• Working of interface valve.
• Interface valves are membrane type.
• Diameter restricted to prevent clogging.
• Collection chamber at each house.

Vacuum Lines/Hydro-pneumatic Transport

• Vacuum sewer line work on the elevation profiles i.e. high or low points.
• Flow situations cannot be described by hydraulic laws.
• Conveyance take place by means of two phase regime.
• Sewers are laid in the form of saw-tooth profile.
• Gradual flow of sewage by “tooth by tooth” mechanism to the vacuum station.
• Usually HDPE or PVC pipes used.
• Inspection pipes at every 100m.

Vacuum Station

• Wastewater and air is driven to a collection tank at the vacuum station.
• Vacuum generators maintain vacuum in the tank.
• Only place where energy required.
• Vacuum pump maintains negative pressure.
• Vacuum pumps run only for few hours a day.

Advantages

• Low investment costs.
• Saves material cost.
• Flexibility of piping.
• No pumping stations required for lifts.
• No odours, no corrosion of pipes, no danger.
• No manholes are required.
• Sedimentation, infiltration does not take place.
• Absolutely leakage free.
• Reduced installation time.
• No disturbance to inhabitants.

Fields of Application

• Especially difficult situations such as ribbon, peripheral settlement on flat terrain, with high pipe lengths of longer than 4 meters per inhabitant.
• Can pass through water protection areas and areas with sensitive high ground water table.
• Feasible solution in adverse gradient, unfavorable soil, missed ground inclinations.
• Rural areas where buildings are not close to each other as well as in the congested areas.
• Only solution for refurbishment of sewer systems.