Careful feedstock choice makes biogas AD up

摘要

Anaerobic digestion has long been heralded as a solution to cutting farm energy costs and minimising waste, but it's a complex process that needs mastering. An anaerobic digester is like a living creature, which needs to be treated with as much care as any animal. Giving your digester a balanced diet is the key to success. "What you put into a digester has a large bearing on what you get out of it, and like a cow you need to feed it correctly to get the most out of it," says Lucy Hop-wood, NNFCC headof biomass and biogas. "We've found that by using a modest amount of crop material like maize or grass silage, an average digester can increase its energy output tenfold for only diree times the capital cost, but for smaller digesters just using slurrymay offer th cemost financially attractive option."