Sewage sludge is formed at every stage of the wastewater treatment process. As early as 1995, we committed to recycling all sludge as treated biosolids.
Biosolids are usually treated in large tanks called digesters and much of the water is removed to produce a material that can be spread on fields used for growing crops. Biosolids provide nutrients to soil and plants, enabling farmers to replace some man-made fertilisers. This saves not only money but also the energy and environmental impacts associated with fertiliser production.
Recycling biosolids to agricultural soil plays an important role in replacing the loss of organic matter that can arise from intensive farming, causing soil erosion.
Untapping new energy and resources from urban sanitation - Nereus
We've joined forces with several other European companies as part of a multi-million pound project to focus on creating New Energy and Resources from Urban Sanitation (Nereus).
Involving eight partners and a total of €8 million of EU funding from the Interreg 2 Seas Regional Development Fund, the Nereus project will help us improve how we recover nutrients (such as phosphates and nitrogen) at wastewater treatment works.
The overall objective of the project is to increase the recovery and reuse of resources (energy, water and nutrients) from wastewater by boosting and investing in new technology from wastewater in urban areas.
Our work will continue until September 2020 – the video below explains how this will help us become more efficient and resilient.