Year 2014
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  • Glossary


Water and steam are used in Neste Oil’s refining operations. The refineries' water consumption is constantly monitored in terms of parameters such as water usage and its efficiency, and cooling water and wastewater management. No direct targets for water usage have been set, as usage forms an integral part of refining processes, safety, and energy consumption. Nevertheless, we aim to minimize water consumption whenever possible, especially when doing  maintenance and reconstruction.

We also take water issues into account when selecting renewable inputs and suppliers. The company's palm oil suppliers, for example, are required to engage in regular water usage monitoring. Our experts also actively monitor water research related to different crops and agricultural areas.





Water usage *) (m3/a)




Wastewater (m3/a)




*) Excluding cooling water

Where does the water we use come from and where does it go?

The sources of the water Neste Oil uses are:

  • the River Maas in Rotterdam
  • the River Mustijoki in Porvoo and
  • the River Kokemäenjoki in Naantali.

In Singapore all consumed water is purchased from local water and steam providers. Original water sources are recycled wastewater, desalinated seawater, harvested rainwater, and surface water purchased from Malaysia.

Water balance calculations have been produced for Neste Oil’s refineries covering the inputs and outputs at these sites and the volumes of their most important water flows.

Read more about the water cycle on our website.

Wastewater treatment at Neste Oil's refineries

Treated wastewater is discharged into waterways at the Porvoo, Naantali, and Rotterdam refineries. Before being discharged into waterways, all wastewater passes through on-site treatment plants featuring physical-chemical and biological processes. Following pretreatment, wastewater from the Singapore refinery is directed into a local Public Utilities Board treatment plant. The pre-treatment of wastewater discharged to sewers was enhanced in Singapore in 2014, and the measures will continue in 2015.

New aerators for chemical and biological treatment were installed at the Naantali wastewater treatment plant at the beginning of 2014, increasing the effectiveness of the wastewater treatment process. In addition, a project to increase wastewater treatment buffer capacity is underway at the Naantali refinery. The project began in 2014 and will be completed in spring 2015. The buffer capacity will be increased by converting an old oily water storage tank into a buffer tank. Modernization was carried out at the Porvoo refinery wastewater treatment plant in 2014.

Waterborne emissions (t/a)*








Chemical oxygen demand (COD)












* The figures concern Neste Oil's Porvoo, Naantali and Rotterdam refineries from which treated wastewater is discharged into waterways.

Regular monitoring of waterways

Neste Oil has monitored the water quality of the sea areas off its refineries in Finland for many years in collaboration with outside experts. Monitoring covers water quality, the organisms found on or near the seabed, and local fisheries. The authorities are responsible for monitoring marine conditions in Rotterdam, and the operator of the wastewater treatment plant in Singapore.

In 2014, a survey of the spreading of wastewater and its impact on water quality in the sea area in front of the refinery was carried out at the Porvoo refinery. The results indicated that impacts mainly concern the waters of the port. A new method with which the impacts of wastewater could be investigated from the bottom sediment to surface water was employed.

The emission limits of wastewater measured at the Rotterdam refinery was exceeded twice during 2014, but no significant environmental impact occurred.