Waste Water

We are specialists in physical chemical waste water treatmernt plants where waste is macerated, aerated and chemically treated to reach aerobic condition, as well as Membrane bioreactor technology (MBR) in which waste water is pushed through membranes to remove pathogens and is oxygenated to produce H2O, then UV and chemically treated.

EVAC vacuum collection units collect black and grey wastewater and condensate water by using vacuum to transport it toward the collection tank. Vacuum collection units are also used in conjunction with freezer and refrigeration equipment to collect condensate water.

Our team can provide system design, system review, system maintenance and specialist products required to build a municipal vacuum system. We stock all components required to maintain these systemsin our Perth and Sydney facilities and have technicians available to help onsite as required.

We can also provide mixed vacuum systems, where we use water saving EVAC vacuum toilets within a building, using just  0.9  litres per flush, and then utilise Iseki Redivac pits and valves to collect all other gravity waste water. All of these products operate from the same vacuum plant and main line piping.

These installations vary from hotels retrofitted into historic finger wharves, through to large housing estates built on ground with a high water table and even industrial estates built on reclaimed land at port facilities.

Many of these installations would not have been possible without a vacuum solution as traditional trenching was not possible, was cost prohibitive or local conditions meant the consequences of sewerage leaks were too significant.

Vacuum systems supplied by HIFraser replace gravity mains and transport waste water at a high velocity in the vacuum piping, so the piping can be run in shallow trenches parallel to the ground surface or where necessary above ground. In addition, it is possible to move sewage uphill and around obstacles giving great freedom for designers and builders alike.

1. Waste water is discharged from a building or facility via gravity and directed into a valve chamber.
2. The bottom section of the chamber is shaped to form a small sump.
3. This sump creates batches of waste water for transfer via the vacuum piping.
4. An Iseki Redivac vacuum interface valve is mounted in the top of the chamber and is fitted with a suction pipe dropping down into the sump.
5. As the waste water rises in the sump, it triggers the valve to open to the vacuum sewer piping.
6. The atmospheric air pressure acting on the waste water in the sump forces the water up suction pipe, through the valve and in to the piping.
7. The valve stays open for 6-10 seconds after all of the waste water has emptied from the sump to allow air to enter the piping.
8. This air mixes with the waste water batch creating a foaming mixture which travels down the piping at up to 6m/s.
9. The valve then closes, completing the cycle.
10. As the foaming mixture travels down the pipe, the waste water slowly separates from the air and drops on to the walls of the pipe.
11. This drains by gravity to the lowest point in the piping sawtooth, collects as a small pool and then is again transported down the piping via the next batch of air travelling down the pipe.
12. It is the total drop in vacuum pressure along the pipe that limits the piping length.
13. Eventually the air and liquid reaches the vacuum plant room and enters the vacuum tank.
14. The vacuum plant comprises a tank usually manufactured in steel, vacuum pumps which can be liquid ring or dry vane type, sewage discharge pumps, a control panel and various pressure and level sensors in the tank.
15. The vacuum tank stores both vacuum, to ensure peak loads are met without vacuum loss, and the waste water.
16. The discharge pumps operate once the waste water reaches a pre-determined level and transfers the wastewater to a treatment plant.