Fertilisers: Waste
(asked on 1st September 2025) - View Source
Question to the Department for Environment, Food and Rural Affairs:
To ask the Secretary of State for Environment, Food and Rural Affairs, what assessment his Department has made of the potential merits of using biodigesters to convert waste materials into organic fertilisers.
Answered by
Mary Creagh
Parliamentary Under-Secretary (Department for Environment, Food and Rural Affairs)
The Government’s Simpler Recycling reforms require the collection of food waste in England from all workplaces from 31st March 2025, all households by 31st March 2026 and all micro-firms (with fewer than 10 staff) by 31st March 2027. These reforms will increase the quality of materials collected for recycling and make the separate collection of food waste mandatory, ensuring that food waste can be treated through composting and anaerobic digestion (AD) – producing biogas (at AD) and significant greenhouse gas savings rather than sending food waste to landfill. Anaerobic digestion plays an important role in creating a circular economy by displacing fossil-fuel based fertilisers with digestate, an organic fertiliser and by-product of the AD process.
In February 2025, Defra and WRAP published the Recycling Infrastructure Capacity Analysis. This provided a forecast of investment opportunities, including the potential to invest in 1.375Mt/pa of anaerobic digestion capacity in England from 2035.
The Green Gas Support Scheme (GGSS) run by the Department for Energy Security and Net Zero (DESNZ) provides tariff-support for biomethane produced via anaerobic digestion and injected into the gas grid. The scheme requires 50% of biomethane (by energy content) to be produced from wastes and residues, which is expected to support treatment of increased tonnage of food waste. In February 2024 DESNZ issued a call for evidence (CfE) to assess the barriers to growth in the sector and the options available to address them. DESNZ is considering the responses received and are developing policy options on a future framework that supports growth in the sector while managing environmental risks effectively.
Furthermore, as Defra develops the Circular Economy Strategy for England, and the agrifood roadmap therein, we are considering the evidence for interventions right across the economy. That includes exploring the circularity impacts of a wide range of levers, such as how to manage biowaste and the sustainable use of digestate. The Strategy will be published for consultation in the coming autumn.