Enhanced biogas production
- 50-65% of the organic matter (Volatile Solids – VS) in sludge converted to biogas
- High quality biogas, rich in methane, low in H2S
- Ideal for green electricity, as renewable vehicle fuel, or substitute for natural gas
Improved dewaterability after digestion by 50% - 100%
- Dewatering up to 40% DS (dry solids)
- Less material handling/transport
- Significant mass reduction
- Less water evaporation for sludge drying
- Digested and dewatered Cambi cake stockpiles and composts easily without any additional structural material
- Pasteurization and stabilization of final biosolids product/cake
- Thermal treatment at 165°C for 20-30 minutes before digestion eliminates all pathogens
- No regrowth or reactivation of bacteria
- Increased stabilization of cake after digestion due to high organic matter conversion
The digested sludge has no negative odour
- Odour nuisances prevented due to the closed process cycle
Highly energy-efficient and reliable process
- Maximum reuse of steam in thermally insulated vessels
- Maximum dry-solids feed (16-17% DS) to the Thermal Hydrolysis Process
- Thermal energy use is thus comparable or even less than other methods of pasteurization
- Direct steam injection avoids clogging and unexpected shut downs of heat exchangers
Lower retention time and higher dry-solids content in digesters
- Reduced viscosity from thermal hydrolysis (making the sludge more fluid)
- Digesters can be fed with a sludge concentration of 8-12% dry solids (DS), twice that of a conventional digester
- Increased speed of digestion
- Together these factors increase digester capacity 2-3 times, with loading rates up to 6kg/m3/day of organic matter
Robust anaerobic digestion process
- Ideal feed for anaerobic digestion; consistent and free of unwanted micro-organisms
- Elimination of foam-causing filamentous bacteria
- High alkaline buffering capacity
- High active biomass concentration
