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Water Treatment Process

All wastewater streams are carefully purified in a treatment plant before being released back to the natural environment. This is essential, since impurities in untreated water discharges can harm ecosystems in lakes, rivers and other natural water bodies.

Water, released from their pulp- and board mills, is ecologically safe, and in line with the Directive on industrial emissions 2010/75/EU (IED) (former IPPC Directive on pollution prevention and control). The Directive sets emission limits that serve as a basis to regulate the content of pollutants in an outflow.

Water Treatment Process

Before being released back to the environment, the wastewater undergoes several treatment steps.

  1. After fibres and other heavy material sink to the bottom in primarily settling basins, the fibre free water is released to aerated tanks or basins. In biostage, the waste water is biologically treated by micro-organisms, which decompose oxygen consuming material.
  2. At the next step, floats of microorganisms are to a certain extent pumped back to the biological stage. These microorganisms can be once more used in the biological treatment. If needed, a final clarifying step is performed.
  3. After this step, biologically and chemically treated water is released back to the same water source from which it was previously taken.