Plant capacity and expected performance:
| • 14,000 metric tonnes DS/year |
• Pasteurized cake |
| • High dry solids loading (>10%DS) |
• High biogas production |
| • 2 x 3,500 m3 digester volume |
|
On 21 December 2007 Biovakka Suomi Oy awarded Cambi AS for a 3-reactor Thermal
Hydrolysis plant for the pre-treatment of sludge prior to anaerobic digestion for a sludge
treatment centre located in Turku, Finland.
Cambi THP was chosen from among various alternatives, incl. pre-pasteurization, investigated
by the client. The main reasons for choosing Cambi THP were guaranteed sterilization,
higher yield of biogas, higher VS-reduction, lower amount of remaining sludge and better over
all energy balance.
The plant will have enough capacity to treat the sludge from the city of Turku and the
neighbouring communities. The biogas plant will process mixed primary and secondary
sludge produced at the Turku regional wastewater treatment plant, currently under construction.
The WWTP will start operating 1 September 2008, and the biogas plant including the THP will
start to receive sludge at the same time. The construction site is close to the landfill in Turku,
about 10 km away from the wastewater treatment plant. The biogas will be utilized as renewable
energy in the most efficient way in accordance with the latest trends within EU.
The benefits of the Cambi process are:
• Compact digestion plant with high loading rates and biogas production
• Cambi was chosen because of highest return on capital of competing technologies
• Pasteurized cake with high dry solids content (i.e. low volume) gives the plant flexibility whether to
dry or to apply directly on agricultural land.
• Stable digestion process with high availability reduces client’s risk (a private developer).
