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Useful raw materials from residuals
Stora Enso has continued to implement projects designed to improve the efficiency of resource utilisation and turn residuals into useful raw materials. This work has resulted in a reduction of 9% in the company's overall need for landfill waste disposal during 2001. Several major projects implemented in 2001 have made important contributions in this respect.
Four of Stora Enso North America's five wastewater treatment plants now have permits allowing the use of their residuals as fertilisers or for soil improvement on agricultural land. The Water Renewal Center and Port Hawkesbury Mill received their permits during 2001. Port Hawkesbury Mill began spreading fertiliser on 20 local farms during the summer of 2001, and the Water Renewal Center will begin similar operations in January 2002. The amount of sludge ending up as landfill is expected to fall by around 60%.
The Canadian province of Nova Scotia has aimed to reduce the amount of solid waste sent to landfills by at least 50%. The Port Hawkesbury Mill is well above this target, thanks to the adoption of a new waste management programme.
Reisholz Mill installed a new filter in the water loop of one of the mill's paper machines, reducing quantities of fibrous sludge by 50% in 2001.
In Sweden, four mills have been actively developing wind and sun drying techniques for logging residuals, fibre residuals and chemical sludge. The dried products are then used either as bio-fuels or for soil improvement, and this has reduced the amount of waste sent to landfill by some 90 000 tonnes.
For more information about residuals in energy production, see Energy.
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