Grafham WTW
Meena Hashemi
24/06/24
1 of 7
Grafham Water Treatment Works (WTW), one of the largest water treatment facilities in the UK, is operated by Anglian Water and situated in Cambridgeshire. Spanning over 600 hectares, Grafham Water has a capacity of 59 million cubic meters and was constructed to meet the growing water demands of Bedfordshire, Northamptonshire, and the newly established town of Milton Keynes, with the water primarily sourced from the River Great Ouse. This WTW plays a crucial role in supplying drinking water to a substantial population in the region.
Mitcham Repair GAC Filters
To purify the water, Grafham WTW is equipped with 16 Granular Activated Carbon (GAC) filters, which are crucial for eliminating organic contaminants, pesticides, and taste and odour compounds. These filters play a vital role in maintaining water quality standards. However, their efficiency can diminish over time due to contaminant buildup and the natural degradation of the carbon media. To ensure their optimal performance and the consistent supply of clean water, regular maintenance and repairs are necessary. Over the years, these filters have been progressively upgraded to improve their efficiency and effectiveness.
In April 2024, CRL was appointed as the principal contractor to undertake improvements to enhance the performance and longevity of the GAC system. The scope of the work included raking out and resealing all mastic joints in the walls and floor using Sikasil DW, and overbanding all the vertical and horizontal wall joints on the filter floor, along with the soffit joints in the plenum chamber, with the Masterseal 930/933 system.
The team faced several challenges, such as overbanding to the soffit in the plenum chamber, which is only 1.3 meters high and has an access opening of 600mm, making it an extremely tight space for the work. Additionally, prepping the floor joints, which were 40 mm by 40 mm, required meticulous precision to ensure a proper seal. Despite these challenges, the project was completed within the scheduled timeframe. This successful endeavour marks the beginning of further repairs and refurbishments of the GAC system in the near future for Anglian Water.
In April 2024, CRL was appointed as the principal contractor to undertake improvements to enhance the performance and longevity of the GAC system. The scope of the work included raking out and resealing all mastic joints in the walls and floor using Sikasil DW, and overbanding all the vertical and horizontal wall joints on the filter floor, along with the soffit joints in the plenum chamber, with the Masterseal 930/933 system.
The team faced several challenges, such as overbanding to the soffit in the plenum chamber, which is only 1.3 meters high and has an access opening of 600mm, making it an extremely tight space for the work. Additionally, prepping the floor joints, which were 40 mm by 40 mm, required meticulous precision to ensure a proper seal. Despite these challenges, the project was completed within the scheduled timeframe. This successful endeavour marks the beginning of further repairs and refurbishments of the GAC system in the near future for Anglian Water.