Technical Background Small Scale Biogas production

Technical background on small scale anaerobic digestion of food waste Iemke Bisschops, Els Schuman, Kasia Kujawa, Henri Spanjers

What is anaerobic digestion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Types of digesters ,[object Object],[object Object],[object Object],[object Object],[object Object]

Slurry digestion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Digesters ,[object Object],[object Object],[object Object],(images references in CCN phase 1 report)

Digesters ,[object Object],[object Object],[object Object]

AD systems - Suitability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Small scale AD interest growing ,[object Object]

Food waste ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Anaerobic Conversion of Organic Matter CH 4 / CO 2 Methanogenesis Acetogenesis Suspended, colloidal organic matter Hydrolysis Acidogenesis volatile fatty acids alcohol H 2 / CO 2 acetic acid proteins carbohydrates lipids amino acids sugars free fatty acids glycerol ammonia

Biological stability - Acidification ,[object Object],[object Object],Overloading Methanogenic capacity exceeded Poor buffering capacity VFA increase pH decrease Unionised VFA increase Methanogenic toxicity increase

Biological stability - Acidification 50% inhibition by acetic acid Methanogenic capacity exceeded Poor buffering capacity VFA increase pH decrease Unionised VFA increase Methanogenic toxicity increase 30000 8 3000 7 300 6 30 5 Concentration (mg/l) pH

Food waste as AD substrate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Food waste as AD substrate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examples of regulations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Legislation - ABPR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Digestate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Digestate use – Practical ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Biogas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Biogas use on small scale ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object]

Summary of system criteria ,[object Object],[object Object],[object Object],[object Object],[object Object]

Process design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Proposed system concept Simplified process flow diagram, not to scale. Dashed connecting lines: slurry/liquid flow could be done manually

Technical Background Small Scale Biogas production

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