Whether contaminated, out-of-spec, or unsuitable for direct land application, these materials can be treated through tailored solutions including blending, lime treatment, or energy recovery. FGS Utilities services are designed to stabilise, repurpose, or safely dispose of non-compliant sludges, supporting clients in meeting regulatory standards while maximising resource recovery wherever possible. FGS Utilities have an established team that are able to undertake land finding, product and soil testing as well as dealing with EA compliance/permitting.
On site treatment:
Within wastewater treatment sites, FGS Utilities can provide lime treatment for raw or untreated biosolids using mechanical mixing. Lime is available in powder, liquid, or granular form—granular being preferred for reduced dust and improved handling. Treatment can be carried out via fixed plant or a mobile trailer mixer, which is telehandler-loaded and can discharge directly to road transport. Our systems can process 200 to 1,000 tonnes per day. Services are delivered under the client’s BAS (Biosolids Assurance Scheme) accreditation, enabling a faster and more streamlined setup.
Off site treatment:
FGS Utilities operates several BAS-accredited sites for licensed treatment of raw or untreated biosolids, eliminating the need to use valuable working pad space at wastewater treatment works. Our remote facilities can process 150 to 300 tonnes per day, depending on location and intake commitments, and are supported by pre-permitted landbanks for stockpiling treated material.
Restoration:
We work with third-party restoration sites to repurpose non-compliant biosolids—raw, untreated, or contaminated—as part of capping blends for landfill or open-cast mine restoration. These projects typically require a steady intake of 100–200 tonnes per day, often mixed with compost and soil to create a suitable restoration medium.
Energy from waste:
Several energy generation plants in the UK can accept biosolids as part of their daily feedstock. Delivered either raw or pre-mixed with other waste materials, biosolids contribute valuable methane, improving the calorific value of the mix. The energy produced is exported to the national grid. FGS Utilities holds trading agreements to supply these facilities consistently, subject to analytical testing and intake compliance.
Pyrolysis:
An emerging biosolids treatment technology, gaining relevance amid growing concerns over nutrient runoff and microplastic contamination in soils when used in agriculture. While costly to install and maintain, it produces large amounts of clean energy with minimal ash by-product.
