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Hias Process: compact biological nutrient removal technology

The Hias® Process may be the world’s most compact biological nutrient removal technology. The process is highly advanced, eco-friendly and 100 per cent scalable.


Treating wastewater is either expensive, chemical-intensive or both. And over 80 per cent of the world’s wastewater is released into nature without treatment, according to the UN. As a result, many parts of the world have huge problems with contaminated water.

On the other hand, wastewater is one of the world’s largest untapped resources for recycled phosphorus. Traditional wastewater treatment, however, has not focused on such potential side-effects, using chemicals that effectively block the recycling of phosphorus.

Biological treatment

To improve traditional wastewater treatment, Hias How2O has created the Hias® Process, a continuous biological water treatment.

The Hias Process cleans wastewater by facilitating the growth of naturally occurring bacteria in biofilm. This removes phosphorus, nitrogen and organic substances from the water without the use of heavy chemicals.

After treatment, about 50 per cent of the phosphorus becomes available for recycling. Since the Hias Process does not involve any chemicals, the recycled phosphorus can be used for high-grade fertiliser and other agricultural products.

Concrete benefits

The Hias® Process not only makes wastewater treatment less expensive and more effective; it can also be an important contributor to the circular economy in agriculture.

An independent feasibility study found the Hias Process to have low capital expenditure and a small carbon footprint, compared to mainstream technologies.

Market potential

Global investment in wastewater treatment infrastructure is forecast to rise by more than 20 per cent in the coming decades. In Norway alone, the investments needed until 2040 is estimated to be USD 1.75 billion. On a global level, the corresponding investment needs are counted in trillions, according to the OECD.

Hias How2O springs out of Hias IKS, a cooperative between four municipalities in eastern Norway, founded in 1974. Hias IKS owns and runs several water treatment plants in the region.

Hias How2O is a member of NCE Heidner Biocluster, Norway’s national cluster for bioeconomy and sustainable food production.

Clean water and sanitation

6. Clean water and sanitation

About the goal

The Hias Process delivers clean water in a more effective way.

Industry, innovation and infrastructure

9. Industry, innovation and infrastructure

About the goal

The Hias Process promotes sustainable industries by offering chemical-free and cost-efficient wastewater treatment.

Sustainable cities and communities

11. Sustainable cities and communities

About the goal

The Hias Process makes wastewater processing in urban centres more sustainable.

Responsible consumption and production

12. Responsible consumption and production

About the goal

The Hias Process can increase the recycling rate in industry and agriculture.

Life below water

14. Life below water

About the goal

The Hias Process minimises nutrient pollution and contributes to healthy water systems.

Contact company



Sandvikavegen 136, 2312 OTTESTAD, Norway

Anders T. Øfsti

General Manager

+47 473 27 092

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