Lingfield WwTW 

Southern Water’s Lingfield Wastewater Treatment Works (WwTW) in Surrey, approximately 2km north of Lingfield Park Racecourse. The catchment for the works serves the population of Lingfield and surrounding villages. An upgrade project is currently taking place which, once complete, will improve the quality of treated water going back to the environment and make sure Southern Water can meet the new environmental standards set out by the Environment Agency in the Water Industry National Environment Programme (WINEP3). The project started on site in August 2023 and the main works are due to be complete in December 2024.

Project drivers

The Lingfield upgrade was required to fullfil the following drivers:

1. WINEP – P removal (regulatory date 22 December 2024): Lingfield WwTW is already required to achieve P removal, but a more stringent permit will be introduced at the site this AMP. New assets are required to meet the revised permit conditions (phosphorus standard of 0.3mg/l (mean), Fe: 4mg/l (95%) 8mg/l (U/T)) as identified in the Water Framework Directive (WFD) IMPg-P driver in the Water Industry National Environment Programme (WINEP3).
2. U_iMP5 Programme – increased flows (regulatory date 31 March 2025): As well as the Water Framework Directive quality driver, a further project driver is to implement improvements at the site to facilitate an increase of the full flow to treatment (FFT) from 83 l/s to 127 l/s. This will involve the installation of new process assets to provide additional biological treatment capacity and accommodate projected population growth to the design horizon of 2035. The projected population equivalent (PE) at the design horizon is 13,390.