Optimising the heat balance of HELEA® for CHP and GtG installations to deliver the sustainable route to advanced digestion: PRESENTATION ONLY

Lavender, P.¹, and Riches, S.², ¹Royal HaskoningDHV, UK ²Anglian Water, UK

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The sustainable energy efficient route to advanced digestion

Hydrolysis & Pasteurisation
• Hydrolysis –first stage methane production
• Thermal (THP) or enzymic (Helea)
• Breaks large complex macromolecules down into smaller soluble molecules (monomers, dimers) – improves biodegradability (especially
secondary sludges) – more biogas at a faster rate
• Hydrolysis is rate determining step – moving hydrolysis out of digesters makes process more efficient
• Operate at higher digester VS loadings – reduce volume of new digesters/increase throughput through existing
• Pasteurisation – kills pathogens – recycle to agriculture
• Pasteurisation – classic time temperature relationship – the higher the temperature, the lower the holding time (e.g. 55 oC for 4 h, 70 oC for 1 h)