PROJECT FOCUS Odour control
ERG (Air Pollution Control) supplied two dual-bed carbon filters operating in series to prevent odours escaping from the new sewage pump station at the Olympic Park. The odour treatment can be checked at the ducting between the filters. If odour is detected, indicating that the carbon in the first stage is depleted, it is taken offline for the carbon to be changed while the odour continues to be treated by the second stage filter.
The system achieves an outlet of <1000 odour units/m3.
Newham, Waltham Forest and Hackney – as well as making sure the developments complied with national planning regulations. In its bid to be the greenest ever games the ODA pledged to reduce the amount of materials carried to the site by road. The ODA is beating its target to transport 50% of building materials by water and rail. One of the key components of this is low carbon concrete mixing plant on site. Maybeck said: “A lot of the challenge has been getting contractors to think differently.” Now the water and electricity networks are 90% in place the next big step will be to build a water recycling plant . The ODA has set a target to reduce consumption of potable water by 40% and will shortly be announcing a major water recycling scheme that will use harvested rainwater collected from the aerodynamic roofs of the Olympic park.
Mayback says: “We are going to create a plant to treat wastewater and top up rainwater harvesting. It will be the biggest municipal recycling project in Britain.”
Wastewater and harvested rainwater will be used to supply the electricity substation – which has been awarded a Royal Institute of British Architects award for excellence. The substation heats and cools water that will be used to
provide cheap and efficient heating and air conditioning – both for the athletes and for the communities who will move onto the site after the games have gone.
Already operational – and the second building on site to be completed – is the deep water pumping system, which uses ITT Flygt pumps. This is a key part of the infrastructure which lifts outflow from the low lying site to connect with the Victorian sewer system. Its purpose is to pump wastewater and sewage up to the embankment containing the Northern Outflow – the giant sewer designed by Sir Joseph Bazalgette 150 years ago. The design, by John Lyall Architects, which was built by Barhale construction is an innovative circular design – which reflects the shape of the split dry and wet water wells below the ground. In the open circular courtyard stands a 360° Jib Crane on a swivel – which can be used to pull out faulty pumping equipment. A circular door is big enough to allow a lorry to pass through into the courtyard. Under the ground the split well is 16m deep and 12.5m in diameter – with a wet well on one side and a dry well, containing the pumping equipment on the other. The fully computerised station will be able to handle 880l/s. The control room will be
moderated from the headquarters of Thames Water in Reading. An Olympic-blue light that glows at night on top of the ventilation tower will help to ensure that the new pumping station is not just an unremarkable part of the landscape, but a local landmark. The walls of the new pumping station are etched with drawings taken from the original designs of the Abbey Mills Pumping Station in east London. Mayback said: “The buildings all take their inspiration from great Victorian buildings – such as Battersea Power Station and Tate Modern.” Smith says the new infrastructure was designed to last: “The Victorians did build fantastic sewers and many great buildings. This is a modern version of that. There is no reason why this pumping station shouldn’t be working in 150 years’ time. These things have been built with history in mind – where the site is coming from and where it is going to.” Currently the big push is the greening of the Olympic site. The Queen planted the first of 4,000 new trees and landscaping and planting is already happening around many of the main buildings. The deepwater pumping station, despite its hi-tech spec has been built to incorporate bird boxes and bat boxes and a biodiverse roof, supplied by Bauder, coated with crushed aggregate – which has already started to be colonised by plants and birds. Pinky and Perky – which contain activated carbon – will make sure there are no unpleasant smells escaping to spoil the effect. Robert Griffiths, delivery partner project manager for CLM – the consortium that is responsible for construction on the site, comprising CH2M Hill, Laing O’Rourke and Mace – said: “It doesn’t cost any more to build something with a greener footprint – and this is going to be here for years to come. “But I never thought I would build anything like this.” nnn
December 2010 Water & Wastewater Treatment 15
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