Proceedings

Carbon sequestration and biogas enhancement in anaerobic digestion by carbon dioxide enrichment

Bajón Fernández, Y.B.1, Soares, A.1, Vale, P.2, Cartmell, E.1, 1Cranfield University, UK, 2Severn Trent Water, UK: PRESENTATION ONLY

(free)

Improving anaerobic digestion through CO2 injection

Climate Change Act 2008

UK water industry >5 million tonnes of GHG as CO2e (2010-2011)

> 50% attributed to wastewater treatment

Scattered location and varied size limits CCS application

Increased implementation of biogas upgrading

Main outputs feasibility study…

Renewable energy production enhanced

• 11-16% food waste (first 24 hours)

• 96-138% sewage sludge (first 24 hours)

  •  Different effect of CO2 injection for different substrates
  •  Proved potential of ADs to utilise CO2
  •  Estimated CO2 reductions
  •  3-11% food waste
  •  8-34% sewage sludge M

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