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Mass and energy balances in high dry solids digestion following thermal hydrolysis pre-treatment
Courtesy of Cambi Group AS
Contents of Presentation
- Reconciling biogas production with mass balances
- Classic VSR methods
- Interferences in classic methods in high DS% digestion
- COD and biogas approach
- KPI for advanced digestion
- Optimising energy balance for THP in CHP projects
- Maximising sources of heat
- Minimising uses of heat
- The optimum energy balance
Energy in Sludge COD or VS
- COD - Chemical Oxidation Demand is a fundamental way of measuring the energy value in sludge
- There is a direct correlation between COD and kWh
- In average formula biomass 1kg COD = 3.5 kWh
- Average sludge organic matter = 1.7 kg COD/Kg VS
- 1 kWh = 101 litres methane at 25C
- Therefore 1 Kg VS = about 6 kWh biogas = about 920 litres
per kg VS (at 65% CH4) - Mass balances that achieve more than 1m3 biogas/kg VSR for sewage sludge are dubious as it is the substrate not the process that defines the specific gas yield.
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