Cranfield University Demonstration Report

Closing date: 
31 December, 2016

This report represents one of the nine projects taken through to the demonstration phase of WRAP’s Driving Innovation in Anaerobic Digestion (DIAD) programme.  It was selected as it represented a technological innovation that could optimise and improve AD systems in the UK, making them more efficient and/or cost effective

This project examined the impact of carbon dioxide (CO2) enrichment of anaerobic digesters both in terms of CO2 uptake and methane (CH4) production. The project was driven by:
• The need to reduce greenhouse gas (GHG) emissions in the water and organic waste sector; and
• A potential to increase the amount of valuable (£) methane produced from the same volume of feedstock.

Following the progress of the feasibility study (Phase 1), the aims for the demonstration phase were to confirm the Phase 1 results in up-scaling trials and to study different technologies that could be used for introducing CO2 (g) to food waste or sewage.  Also investigated were energy and mass balances to determine what increases in methane production would be needed for energy positive operation.