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Calcium carbonate waste from an integrated pulp and paper mill as a potential liming agent

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Abstract

Calcium carbonate is used in large amounts in the pulp and paper industry as a paper filler. When it is manufactured, the calcium carbonate waste is purged from the process. Here we demonstrate that, due to the elevated calcium concentration of 168.5 g kg−1 dry weight (dw), alkaline pH of 12.6 and neutralizing (liming) effect value of 42.4% expressed as Ca equivalents, this waste is a potential liming agent and a pH buffer. The heavy metal concentrations in the waste were lower than the new Finnish limit values for fertilizers used in agriculture, as well as for a material, e.g. ash, used as an earth construction agent. These limit values came into force in March 2007 and in June 2006, respectively.

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Authors and Affiliations

  1. The Town Planning and Building Committee, The Environmental Research Division, City of Kemi, Valtakatu 26, 94100, Kemi, Finland

    R. Pöykiö

  2. Stora Enso Oyj, Veitsiluoto Mill, 94830, Kemi, Finland

    H. Nurmesniemi

Authors
  1. R. Pöykiö
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  2. H. Nurmesniemi
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Correspondence to R. Pöykiö.

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Pöykiö, R., Nurmesniemi, H. Calcium carbonate waste from an integrated pulp and paper mill as a potential liming agent. Environ Chem Lett 6, 47–51 (2008). https://doi.org/10.1007/s10311-007-0110-5

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  • DOI: https://doi.org/10.1007/s10311-007-0110-5

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