Plant capacity and performance:
The HIAS wastewater treatment plant serves the city of Hamar and several smaller towns in the
surrounding area and treats a population equivalent of 90,000.
In 1995 Cambi built its first full-scale thermal hydrolysis installation at HIAS as part of a new sludge
treatment process including thermal hydrolysis, digestion, dewatering and gasengine co-generation.
It has since been in successful operation since that time
The sludge treatment process has a capacity of 3,600 tonnes/year dry solids (DS) at 16% DS.
The HIAS WWTP produces approx. 2,650 tonnes dry solids/year, but because of the popularity of the
process and the end product HIAS has progressively imported more sludge from neighbouring communities.
Thus, on 19 January 2005 Cambi AS was awarded a contract to supply an additional anaerobic digester
in order to increase capacity. This was followed by an order in September 2006 to supply and install a
new THP reactor and a flash tank, including associated piping and instruments, into the existing THP room.
This expansion was commissioned at the end of 2007.
The benefits of the Cambi process are:• 65% volatile solids reduction and maximised biogas production.
• Half the cake volume from before THP and digestion
• Integrated combined heat and power with steam production
• The biosolids product meets highest standards in Norway and can be used without any restriction
• Plant now has income from importing sludge from other plants that cannot treat sludge successfully
See Cambi's film showing some of the plants, including the plant at Hamar.
Article in the World Water Magazine "Energy price rises fuel advanced digestion"
Where to find the plant: