Collection – Vacuum Food Waste System

Evac’s food waste handling and processing systems are based on vacuum conveying technology.  Vacuum systems allow segregated conveying of the food waste generated on board.  They are completely automatic and designed as an entirely closed system.

The system conveys food waste by pipe transportation into a cyclone which feeds the food waste to a water extracting station, where water is removed from the waste.  Vacuum pump unit keeps the entire pipeline and cyclone under vacuum.  Double gate valves ensure that food waste is discharged from the silo even when the vacuum system is in operation.

See the Garbage and food waste handling animation here.
Vacuum Generation

Vacuum is normally generated by a vacuum pump unit.  The vacuum is measured by a sensor transmitter in the cyclone and controlled by an automation logic system.

The vacuum is created in the pipeline prior to the vacuum conveying, when a discharge is requested at a feeding station.  When a vacuum of 250 mbars is reached, the feeding station opens a gate valve and the food waste is...
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Infeed Stations

Food waste in-feed stations are freestanding.  They are manufactured completely of stainless steel and come with all necessary fittings housed in a suitable framework.  The hopper is connected to the vacuum collecting system and welded to the tabletop.  The tabletop is equipped with a drain sieve and an overflow to limit the amount of free flowing water in the collecting system. 

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Food Waste Press

The average dry solids (DS) content of the shredded and collected waste is around 5-7%. Before it is suitable for disposal at the incinerator, it must reach a final DS of about 20%.  To achieve this condition, the food waste (FW) is fed into a screw type dewatering unit, which squeezes the liquid out of the FW to separate the excess water from the food waste. 

The FW is collected in the...
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