Thames Water Appoints IWJS to Deliver Storm Tank Clean at Crossness Sewage Treatment Works

IWJS, a part of M Group Services, has been chosen by Thames Water to deliver storm tank
cleaning works at Crossness Sewage Treatment Works (STW).

Under the terms of the agreement, IWJS will undertake the removal of 22,500 tonnes of
heavy waste material, a mixture of sludge, rag, vegetation and grits, from four storm tanks at Crossness STW. The project will provide the plant with additional sewage treatment capacity.

The waste will be removed using high-powered liquid ring and air movement suction units, before being passed via two dewatering screening units to be cleaned and separated into coarse and fine waste streams. The process will significantly reduce the amount of waste being disposed at a registered waste transfer station, providing environmental and efficiency

Kevin Moore, Senior Contracts Manager at IWJS, commented:
“The award of these works is a significant win for IWJS. Throughout the tender process, our team displayed their initiative and expertise in proposing a clearly thought-out process for completion of the works. Having
demonstrated our experience in sewage treatment works, Thames Water recognised our capabilities to carry out the works and we look forward to getting started on the project.”

The work taking place will also enable Thames Water to assess the storm tanks and identify any required repair works including maintenance of the tanks’ mixing stirrers.

Press contact: Kirsty Crouch, Group Head of Marketing Communications
Tel: +44 (0)1438 847264 / 07971 065 979 Email:

About IWJS
IWJS is one of the UK’s leading providers of services to wastewater networks. With services including sewer cleansing and pipe rehabilitation services, IWJS offers a complete, one-stop solution for clients on a nationwide basis.

About M Group Services
M Group Services delivers a range of essential infrastructure services within the water, energy, transport and telecommunication sectors in the UK. The Group has built and maintained relationships with clients over a number of years and is a trusted employer to in excess of 10,000 people working from over 200 locations.