Articles & Case Studies

Cross filter package introduces water recycling for London Gatwick Airport’s sweeper washer vehicles

Posted: Wednesday 8th April 2009

A water treatment package built around Cross automatic backwashing filtration technology is enabling recycled water to be used instead of mains water in the multi-task sweeper washer vehicles used for stand cleaning at the BAA owned London Gatwick Airport. London Gatwick is the busiest single runway airport in the world and the second largest airport in the UK. Around 80 airlines operate from the two airport terminals, serving over 200 international destinations with more than 250,000 aircraft movements a year.

Surface water from the 674 hectare airport flows into a perimeter-sited lake before treatment and drainage into a stream. Raw water from the lake is already used in the airport’s fire tenders and with the new treatment plant can also be safely used in the sweeper washer vehicles. Treatment is necessary for this application in order to remove particles that can block the spray bar nozzles on the vehicles and to eliminate any risks from harmful bacteria including legionella.

The Cross-designed treatment plant – comprising the filter, Ultra-Violet (UV) disinfection equipment, pumps, valves, controls and stainless steel pipework – is contained within a compact weatherproof housing. Operation is fully automatic under PLC control. Water from the lake is pumped into the Cross Phoenix filter, which removes all solid particles above 50 microns, and through the UV treatment tube before filling an adjacent 35000 litre storage tank. When the tank is full the supply from the lake is shut-off and water from the tank re-circulated through the filter and UV tube. The system is designed to switch between the re-circulating and tank filling circuits as the water is used, without interruption to the vehicle filling operations.

As the sweeper washer vehicles are in constant use in the airport’s 120 aircraft standing and apron areas, the new package will provide significant savings in the cost of mains water usage. Initial consumption readings suggest that close to one million litres of mains potable water will be saved annually by the use of this grey water recycling facility. At the same time the new plant is centrally sited, saving the vehicles the repeated long journeys across the airport that used to be necessary in order to reach the mains water fill-up area.

Tel: +44 1225 837000
Fax: +44 1225 834115

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