^GENERAL

^{The traditional method}

<sup>Properties not connected to main drainage now have to discharge sewage into cesspits or septic tanks.  Hundreds of thousands of properties are still using this archaic method which can cause environmental pollution if not properly serviced.

Of course we would like to bring these properties on to main drainage but in most cases they are situated in rural or seaside areas.  In these circumstances, the hilly or flat terrain (high water table) means that the natural fall on which gravity systems depend, must be created artificially.</sup>

^{What is the alternative?}

^{The QUA-VAC VACUFLOW SYSTEM is a clean and highly efficient system for environmentally acceptable sewerage disposal. Compared with traditional deep trench  sewerage, construction and installation is considerably simpler and cheaper.}

In addition, the QUA-VAC system is virtually maintenance-free.  And, because it operates within a closed and leak proof vacuum system, the environment will benefit too.  No sewerage can escape to pollute surrounding areas.

Experts in the field agree that in many applications, the QUA-VAC system is the better and cheaper alternative to deep trench sewerage.  The QUA-VAC vacuum is  perfect for a wide range of applications, particularly where expensive and intricate construction work is to be avoided.  Think of areas of uncertain ground fill or shallow topsoil as well as areas with a high water table or where the environment is fragile.

^{Select the QUA-VAC Vacuum system}

^{With the ON-LINE system, a small amount of sewerage will flow by gravity into an interface unit.  When there is sufficient sewage in the waterlock a valve will automatically open and sewage with air will be sucked into the vacuum main.  The system has the advantage that, since small batches of sewage are being transported, greater level differentials and transport distances can be achieved.}

When using the OFF-LINE method, the sewage flows by gravity into a bufferpot, where a reserve storage is available.  When the level of the sewage in the pot rises, a valve is activated which allows the contents to be mixed with air and sucked into the vacuum main

This system has the advantage that more properties can be connected to one pot.
 

^{ON-LINE SYSTEM}

^{The system consists of:}

^{How does it work?}

 ^{- House connection
 - ON-LINE unit
 - Automatic vacuum valve
 - Ejector or vacuum pumpstation
 - Rising main}

^{EJECTOR PUMP SYSTEM}

^{Sewage is transferred via gravity to the ON-LINE unit, into a waterlock.  When a predetermined quantity has been collected (approx. 20 litres), the sensor opens the discharge valve and a sewage/air mixture will be sucked into the vacuum main.
The discharge cycle, normally 5-8 seconds, is adjustable to allow the system to be "tuned".  The great advantages of the ON-LINE units are its small dimensions (60 x 35 x 90cms)! and low weight (20kgs).}

^{The QUA-VAC pumpstation consists of a concrete sewage pit (approx. 2 x 3 x 3 mtr.) with a dry compartment for pumps and electrical componentry.  Vacuum is generated by one or more water ejectors powered by centrifugal pumps which recirculate collected sewage.  Sewage is pumped through the ejector pump nozzle and the resultant air and sewage mixture is then sucked out of the connected vacuum main and discharged into the collection chamber.}

The ejector pumps maintain a constant vacuum pressure in the entire system of 50 to 35 kPa.  This ingenious method of vacuum generation is simple and reliable and yet allows the collection tank to remain unpressurized.

^{OFF-LINE SYSTEM}

^{The system consists of:}

 ^{- House connection
 - OFF-LINE bufferpot
 - Automatic vacuum valve
 - Ejector or vacuum pumpstation
 - Rising main}

^{How does it work?}

^{Sewage flows via gravity to a bufferpot, which is connected directly to the main vacuum system.  When the bufferpot is filled to a predetermined level, the main switch (sensor) is activated and due to a pressure differential the sewage, together with a certain amount of air, will be sucked from the bufferpot.}

Sewage is then transported into the system and on to the holding tank.

^{BACK TO}

^{VACUUM SEWERAGE SYSTEMS}

^{The advantages and applications of the QUA-VAC vacuum sewerage systems:}

  ^{- Low investment costs
  - Minimal maintenance
  - Quick excavation
  - Low energy consumption
  - Small diameters
  - No deep trenches
  - Flexibility of piping
  - Airation of sewage
  - House boat projects
  - Sewerage of ribbon
    developments
  - Recreation area
  - Marinas
  - Industrial projects
  - Supermarkets
  - Canal estates
  - Renovation projects}