The first major component of the Integrated Waste Management System (IWMS) from Babcock for the new Queen Elizabeth class aircraft carriers – the Waste Water Treatment Plant – has been delivered ready for installation in the first carrier, marking an important milestone.

Designed by Babcock under contract to the Aircraft Carrier Alliance, the IWMS addresses the collection, transfer, treatment, stowage and disembarkation of the various fluid and solid waste streams generated onboard the carriers.

The Waste Water Treatment Plant (WWTP) is a key component of the system, and will process the black (sewage) and grey water (from showers, sinks, galleys and laundries) generated onboard, and discharge permeate compliant with MARPOL 73/78, Annex IV (the international standard for control of marine pollution).? The plant comprises a membrane bioreactor (including cross-flow, aeration, feed and bleed systems) and black water collection system, and each carrier will have three identical, autonomous WWTPs located forward, amidships and aft.

Black water from the heads and medical centre will be vacuum transported to a black water vacuum transfer tank adjacent to each WWTP, while grey water will be predominantly gravity collected to the double bottom grey water tanks (with water from galleys and food processing passing through grease separators).? Subsequent inter-block transfer of black or grey water is an autonomous process controlled by the Integrated Platform Management System.? Bio-sludge generated by the membrane bioreactor units may be periodically pumped either to shore, overboard, or to the Solid Waste and Final Treatment System for drying and thermal destruction (pyrolysis) onboard.? The dry solids content of the bio-sludge will be 2-3%.

Factory acceptance testing of the WWTP was successfully completed at Babcock’s Bristol premises last month, prior to despatch.

To facilitate ship installation, Babcock has grouped and mounted the WWTP equipment and all ancillary items, with interconnecting pipework and cabling, on purpose-manufactured rafts for optimum efficiency, reducing the resources required at the build yards.

Babcock project manager Paul Moxham commented: “Delivery of the WWTP (the first major component of the system), is a key milestone in delivering the first coherent integrated waste management system on a warship, designed to meet current and projected future environmental standards.”

David Goodfellow, Aircraft Carrier Alliance Ship Build Director, said: “The WWTP is a vital component of both ships, and its delivery signals the achievement of an important milestone in the programme. ?Build progress on the Queen Elizabeth Class continues to progress at a pace across the whole programme, but it is great to see real tangible delivery of items such as the WWTP.”

Babcock will be supplying all the IWMS equipment over the next 12 months.? Installation at the shipyards will be undertaken with support from Babcock, who will also undertake commissioning of the system and harbour and service acceptance trials, for final acceptance on the ships by the Aircraft Carrier Alliance.

Source: Babcock

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