Nammo Vihtavuori and Adven re-thought the water usage of Lake Siikajärvi

Last year the water of the Lake Siikajärvi, situated in central Finland, Vihtavuori of Laukaa, was discovered to be on an exceptionally low level. Nammo Vihtavuori Oy, producing reloading powders, is the most remarkable user of the lake water, and decided to take actions to improve the situation. Adven was chosen as Nammo’s partner for the implementing a progressive close loop water system. From autumn 2016 on, 40% less water will be taken from the lake in comparison to the previous. At the same time the solution will decrease the total energy usage of the factory by 15%.

Nammo factory in Vihtavuori, Finland, has used water from the Lake Siikajärvi since 1920’s. The clear watered lake was one of the reasons for locating the factory there. Remarkable amount of water is used in the cooling processes during which the water gets warmer and is released back to the water system.  In the future the cooling will be done mainly by using closed loop cooling water cycles, where the released heat is captured and processed to be reused in the heating network of the area.

This enables the water intake from the lake to be smaller in the future. The surface of the Lake Siikajärvi has varied also before but for some reason the it has been low for a long time, despite the water use of Nammo factory has been on the same level as five years ago.  

  • We got concerned feedback from our stakeholders and definitely wanted to take actions to improve the situation. We hope that the water levels will rise again, when the water intake is remarkably lower, says Managing Director Ilkka Heikkilä from Nammo Vihtavuori.  

The environmental effect was the key factor, but also improving the productivity of the whole factory came in question.  When the heat of the water is captured, the total energy consumption of the factory is almost 15 percent lower. This creates remarkable savings. Just by the savings in the energy Nammo can cover the majority of the costs of the solution.

  • Adven was able to offer us a smart solution not only in decreasing the water usage but also providing savings in total energy.  Earlier cooperation between Nammo and Adven now continues and deepens. Our previous project was a steam plant. This project has reached all anticipated cost savings and benefits, Heikkilä sums.

In 2014 Nammo and Adven made a long-term agreement for energy supply, and the Adven built bio steam plant in the area was taken in use last year. Thanks to the new plant Adven now produces steam and heat mainly by using domestic fuels instead of oil.  Steam supply form the bio steam plant has also improved Nammo’s supply security as the factory is no longer dependent on imported fuels. In addition to solving the lake water issue, the closed loop cooling water cycle decreases the usage of fuels and releases steam production capacity for the factory.