Green liquor dregs as an alternative neutralizing agent at a pulp mill |
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| Authors: | R Pöykiö H Nurmesniemi T Kuokkanen P Perämäki |
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| Institution: | (1) The Town Planning and Building Committee, The Environmental Research Division, City of Kemi, Valtakatu 26, 94100 Kemi, Finland;(2) Stora Enso Oyj, Veitsiluoto Mills, 94830 Kemi, Finland;(3) Department of Chemistry, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland |
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| Abstract: | Green liquor dregs is the biggest waste fraction at sulphate pulp mills. It is commonly landfilled. Here we demonstrate that
the utilization of green liquor dregs as a neutralizing agent for acidic wastewaters is a potential alternative and an environmentally
friendly method in contrast to its landfill disposal. The liming effect value of 39.6% for green liquor dregs, expressed as
Ca equivalent, is similar to the liming effect value of 38% of a commercial limestone product. In addition, the pH value of
10.7 indicates a strong liming effect. |
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| Keywords: | Green liquor dregs Causticizing Waste Pulp mill Neutralizing agent Metals |
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