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Research raises questions over best use of biogas

Using biogas from anaerobic digestion (AD) to generate electricity has been questioned by Ann Ballinger, a consultant at Bristol-based Eunomia, who says it creates fewer carbon savings than other end uses.

Speaking at the Association for Organics Recycling's (AfOR) annual conference and awards last week (February 11), Ms Ballinger explained that Eunomia had analysed a range of different uses for biogas.

The research examined the carbon impact of various uses of the biogas produced by anaerobic digestion
The research examined the carbon impact of various uses of the biogas produced by anaerobic digestion
And, it found that using biogas to power vehicles had the lowest carbon footprint, followed by the use of biogas on-site in a combined heat and power (CHP) plant. Pumping gas into the grid was the next most efficient.

Ms Ballinger's research found that when the carbon impacts of treating one tonne of material using AD are analysed, the following carbon savings could be made:

  • Using biogas to generate electricity has a carbon saving of -62kgCO

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