In September Aarsleff rehabilitated 385 metres of a large discharge pipe in Copenhagen, Denmark. The pipe carries wastewater from two municipalities, surface water as well as considerable amounts of wastewater from the company Novo Nordisk A/S.

"The pipe is one of the largest pipes we have ever rehabilitated in Denmark. It is a DN 1,200mm and DN 1,300mm oval pipe", says contract manager Ole Lønberg and continues: "It is of course interesting to rehabilitate a pipe of such large dimension but it is an equally big challenge to handle the large amounts of wastewater that are to bypass the pipe while the rehabilitation work is carried out".

Prior to executing the rehabilitation Aarsleff had some coordinating to do. "We were in contact with the users of the pipe, i.e. the utility company Frederiksberg Forsyning and Novo Nordisk A/S, and calculated the bypass capacity in cooperation with them. We found that in one particular place, during peak periods, the bypass pumping had to be capable of transporting up to 650 litres of water per second", says the contract manager.

Last week all hoses and pumps were disconnected as a conclusion to a job well done.