09/09/2026
If you have been walking on a footpath through the Estate recently, you may have spotted a large dark mound in one of our fields, or on another local farm, and wondered what it is. These are biosolids, a treated, nutrient-rich soil improver that is stored before being spread on farmland.
Biosolids are produced as part of the wastewater treatment process. The organic material is treated and processed before it can be used on farmland and is tested and monitored to strict standards, including checks for substances such as heavy metals.
When applied to the soil, biosolids provide nutrients and organic matter that can benefit crops and plants, including nitrogen and phosphorus. They can also help improve soil structure and reduce the need for other fertilisers.
You may also notice a smell when biosolids are first spread. While this can be unpleasant, it is generally short-lived and fades as the material settles into the soil.
Using treated biosolids is one way of recycling nutrients from the wastewater treatment process back into agriculture, rather than sending this material to waste.