Alpheus Environmental and WPL Ltd partner to supply MOTO motorway services, WinchesterAlpheus Environmental Ltd was employed by motorway services provider MOTO Hospitality Ltd as principal contractor to design and build a replacement effluent treatment plant for the busy motorway services at Winchester. WPL Ltd, Alpheus’ partner for this project, provided the process design, manufacturing, mechanical and electrical installation, supply and commissioning of all the treatment equipment.
When the Motorway Service Area (MSA) at Winchester, then operated by Roadchef, opened in 2000, WPL Ltd designed and installed a sewage treatment plant which managed the wastewater from the site. In recent times this had been identified as undersized for the increasing visitor numbers prior to and after the site was acquired by MOTO in 2008. The site, situated on the M3 between junctions 8 and 9, serves both sides of the M3 with two filling stations and amenity buildings with restaurants, cafes, toilets and shops plus a 40 bedroom lodge.
To deal with increased flow levels and a more stringent discharge consent imposed by the Environment Agency, MOTO awarded a contract to Alpheus Environmental to install a replacement sewage treatment plant. WPL Ltd designed and supplied the SAF-based plant to meet the consent limits of BOD 20mg/l; TSS 30mg/l; NH4-N 10mg/l.
It was imperative that the MSAs remained open throughout the transition and that construction work caused minimal disruption to the operation of the MSAs and its visitors. Due to limited land availability and the presence of existing drains and other services, the part new treatment plant had to be sited at the same location as the original plant. These two issues presented a number of technical challenges during the planning phase, and generated a range of health and safety considerations since construction was undertaken on an existing operational site.