The population growth in Oslo puts ever increasing amounts of sewage water through the pipeline network. The current treatment facility at Bekkelaget is overburdened and the facility shall therefore be extended. Oslo City Council has therefore granted 274 000 000 NOK for the expansion of the treatment facility at Bekkelaget. The project shall be carried out in the period 2014-2020. The entire facility is to be constructed in rock in direct connection to the existing facility.

The constructional work shall mainly be carried out in tunnels and rock rooms, close to the existing treatment facility. The constructional work in IBRA can be divided into 3 parts:

— Treatment part: Sludge treatmnet/rotten tanks/fat reception

— Main part: Intake/primary settling stage/bio-halls/post-settling/filter hall

— Building in the open air

The extension to Bekkelaget treatment facility project is being carried out as joint builder managed contracts. Sub-project construction is to be carried out in accordance with NS8405.