Rathlin’s Biodigester – Composter

Creative Fellow: Charlotte Bonsanquet
Co-Investigators: Dr Emma Campbell & Johnny Weir

Challenge

Rathlin Island’s organic waste from homes and gardens goes into brown bins, collected by a lorry from Ballycastle. Soil, often peat-based and bought in plastic, raises sustainability, biosecurity, and rat control concerns. This fellowship explores links between waste handling, imported soil, and the aspiration for the island’s rat-free status.

Approach

Charlotte has investigated how other communities process food and garden waste, particularly those that produce biogas from composting. She has examined models at Leeana (Galway) and Clandeboye Estate (County Down) and explored custom composting for local use. She has also collaborated with artist, Paddy Bloomer, who brings additional expertise to the design and fabrication of bespoke waste solutions.

Outcomes

The initiative investigates a custom composter to process food waste into nutrient-rich soil, reducing reliance on imports and bin lorry trips. This approach cuts the island’s carbon footprint, strengthens food security, and boosts biosecurity by minimising the risk of rats arriving with external waste services.

Learnings

Biodigesters require substantial, consistent feedstock for effective gas production. Given Rathlin Island’s waste profile, prioritising soil creation through composting emerges as both more important and achievable for local benefit.

Impact

The composter would give the island greater autonomy, delivering food security, significant waste reduction, and positive environmental effects. Enhanced biosecurity is a key outcome. The fellowship catalyses cultural and societal change through creative, locally led solutions and open, community-based learning.