Waste water treatment development in Ishøj industrial area, Ishøj, Denmark

Waste water treatment development in Ishøj industrial area

In Ishøj, Denmark, work is under way on the development of Pilemølle Erhverv, an industrial development that will contain 16 new lots. The project was originally planned for a concrete solution. But together with the contracting firm Gorm Hansen A/S, the utility company quickly became convinced of the benefits of plastic pipes. This is why plastic was chosen for both the stormwater pipes and sewage pipes. The utility company, Ishøj Forsyning, had various strong arguments for a solution using plastic pipes. Durability and a better work environment were important considerations, but the financial aspect entailing a longer life for plastic pipes was particularly crucial in their decision.

“The choice between plastic, fibreglass and concrete is always a balance between budget, work environment, timetable and physical conditions. And obviously, overall economy is always a major factor,” says Peter Dreier, an engineer at Ishøj Forsyning.  

This is not the first time plastic pipes have been chosen on a project where Ishøj Forsyning is the main client.

“The supply company has used plastic pipes in several projects – so far with good results,” says Dreier.

Project facts

Ishøj, Denmark
Sewer, waste water treatment, Storm water
Completion: 2019

Uponor Involvement

329 ex. 3000mm IQ pipes. Dimensions ø400-800.

Flexible IQ plastic pipes for complicated pipe-laying

Construction company Gorm Hansen A/S is the main contractor on the Pilemølle Erhverv project, and Department Manager Jacob Nielsen lists several benefits to using plastic pipes for large-scale sewerage works.

“Plastic pipes have a significantly longer service life, and it’s far easier for our team to work with plastic pipes, as they are just one-tenth the weight of concrete pipes. That saves both machine and labour resources. An added challenge is that the work site is close to a large road, with a lot of large supply lines and cables running underneath. To get under these, plastic pipes offer the most flexible solution,” Nielsen explains.

The characteristics of the compatible IQ piping system, in particular, are attractive, according to Nielsen. The ability to combine the sewage pipes with wells, in addition to the low weight of the plastic pipes, makes working with plastic pipes easy.

There are also positive reports from the construction site in Ishøj, where Gorm Hansen workers are very happy to be using plastic pipes.

“At this time of year in particular, when the weather can be a challenge, our people on site are delighted to have such an easy pipe to work with,” says Nielsen.

Gorm Hansen A/S has long been working with plastic pipes. Whilst Nielsen used to be somewhat sceptical of using plastic pipes for sewerage, the development of products and methods in recent years has proven that plastic is absolutely on a par with other materials. The Department Manager can therefore also count on a high-quality end result in Ishøj.

“I fully expect us to finish the project with the same quality we’re already renowned for, and with a sewerage installation the client will benefit from for many, many years to come,” Jacob Nielsen concludes.

So the IQ pipes will play a major role in the extensive sewerage work and ensure a robust and durable sewerage system. Uponor has supplied a total of 329, 3000 mm IQ stormwater pipes in dimensions ranging from Ø400 to Ø800 mm for the new development project.

At Ishøj Forsyning, the expectation is that they will be able to add yet another success story to the list when the work at Pilemølle Erhverv is complete.

“We expect the finished project to be a win-win solution. If both the construction company and the client have achieved a good result thanks to the chosen solution, it’s a success. Ishøj Forsyning anticipates a smoothly functioning pipe network, one that will prove its value over time,” says Peter Dreier.


Pilemølle industrial land development – part of a broader climate solution in the municipality

 Pilemølle Erhverv is a result of the railway construction between Copenhagen and Ringsted. The area was previously used for agriculture, but since the railway split the area in two, it was obvious that the land facing the existing industrial site should also be used for commercial purposes. Ishøj Municipality and Ishøj Forsyning are therefore now preparing the area with stormwater pipes and sewage pipes. Stormwater reservoirs will be built south of the industrial zone in a recreational area, retaining the stormwater before releasing it into the nearby Vejleå river.

Waste water treatment development in Ishøj industrial area

pilemoller iq pipe 1 3160x2240

Project information

Project information

Project Type
New building
Building Type



Client: Ishøj Forsyning and Ishøj Municipality
Consultant: SWECO
Main contractor: Construction firm Gorm Hansen A/S
Pipe supplier: Uponor Infra A/S


Similar projects

A new generation biotechnology factory

A new generation biotechnology factory

The object for the largest investment in the Finnish forest industry has been completed. Metsägroup's pulp mill in Äänekoski started operations in August 2017. Uponor Infra was involved in building a new generation bio mill.
Weholite yields savings and smoother implementation

Weholite yields savings and smoother implementation

New dry land fish farm which will produce 3,200 tonnes of rainbow trout annually is being build in Eckerö in the Åland Islands. Uponor Infra has provided design assistance and delivers the pipes and is responsible for their installation and welding.

Sustainable  solution for  a pulp & paper mill

Sustainable solution for a pulp & paper mill

Weholite’s ability to withstand external wear, such as friction against the seabed, was an important criterion when the outfall pipe of Stora Enso’s pulp and paper mill in Nymölla, southern Sweden, had to be replaced.



Power boost for Stockholm’s district heating network

Power boost for Stockholm’s district heating network

Stockholm Exergi AB is an energy utility company that operates in Stockholm. It is jointly owned by the City of Stockholm and the Finnish energy giant Fortum Oyj. The company produces district heating, district cooling and electricity. Today, it supplies heat to approximately 800,000 in-habitants in the Stockholm region.
Extension of the district cooling station seawater intake in Helsingborg, Sweden

Extension of the district cooling station seawater intake in Helsingborg, Sweden

 The district cooling system in Helsingborg involves the streamlining of current production. By means of seawater and using heat from the district heating network to power an absorption cooling unit, district cooling provides much better environmental values than electric cooling units. The district cooling station is an efficient source of cooling for buildings, industrial facilities and shopping centres.


A raw water system for the new power unit

A raw water system for the new power unit

To ensure failure-free operation of a raw water system, a polyethylene-made pipeline (PEHD) with a length of approximately 9 km was installed (in mining damage conditions), of which 3 km uses the trenchless technique – relining.
Stora Enso Nymölla mill biogas facility

Stora Enso Nymölla mill biogas facility

Stora Enso Nymölla Mill in southern Sweden produces pulp- and wood-free uncoated paper and is the second largest paper manufacturing company in Europe. Nymölla Mill belongs to the "Paper" division and has an annual capacity of 340,000 tonnes of pulp and 485,000 tonnes of paper. The mill started in 1962 and has 540 employees. The paper manufactured by Nymölla Mill is recyclable, renewable and biodegradable. Approximately 90% of Nymölla Bruk's paper brands have eco-label certification that certifies the products' reduced environmental impact during the product's life cycle. Paper products from Stora Enso are available all over the world.