18 ANDRITZ METSA GROUP ¨


Pulp Paper & Logistics


So far, product gas, biogas and sulphuric acid are being produced in the mill’s ecosystem. Minimised emissions, low specific water consumption, as well as high energy and material efficiency have been the central design criteria for the bioproduct mill. The wood raw material used by the mill and all side streams are fully utilised as products and bioenergy. The bioproduct mill will


contribute to achieving renewable energy targets in Finland. The mill concept maximises the bioenergy to be sold and increases the share of renewable energy in Finland by about two percentage points. Furthermore, the mill will not use any fossil fuels. All of the energy it requires will be generated from wood. The electricity self- sufficiency rate of the mill is claimed to be 240 per cent.


November/December 2017


Despite the significant increase


in production, the mill will remain compliant with the environmental permit granted to the previous pulp mill in 2006. The goal of the bioproduct mill is that all production side streams and waste will be reused. The equipment systems are based on energy efficiency and clean technology, such as: • Emissions into water: no effect on the usability classification of the natural waterway


• Emissions into the air: the quality of air in the town is improved in terms of odorous compounds


• Noise: the noise generated by the mill and the mill area is not exceeding the guideline values


• Solid waste: the amount of solid waste is minimised, and recycling is continuously developed.


A key bioproduct is product gas made from bark which is used as the main fuel for the lime kiln at the mill.


The bioproduct concept is


complemented by the agreements made with biogas manufacturer EcoEnergy SF Oy and biocomposite producer Aqvacomp Oy. The biogas plant that EcoEnergy


SF Oy built at the mill is the first in the world to make use of the sludge generated in pulp production, producing about 20 gigawatt hours of biogas a year, with possible uses of the biogas including conversion into transport fuels. Aqvacomp Oy is investing in a plant that produces biocomposite.


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