What is it about?

Pulp mills produce condensates which are not re-used in the process, thus limiting the closing of the water cycle in the factory. These have in their constitution aromatic and organosulfur compounds, such as toluene, ethylguaicol, syringaldehyde, dimethyl disulfide or dimethyl trisulfide, some of these being malodorous/hazardous compounds. In this work, these substances have been removed by adsorption on activated carbon. The treatment allowed the elimination of up to 99% of the obnoxious odor, color and turbidity of the condensate.

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Why is it important?

For the first time, a stripped condensate collected from a kraft pulp mill was treated with commercial activated carbon aiming at the development of an effective purification process.


The reagent cost for the purification of the condensate should be around 2.9 €/m3, taking into consideration an activated carbon (AC) price of 3.25 €/kg. This price would be substantially reduced by the regeneration of spent AC by steaming, which is a common industrial operation for AC regeneration.

José Gamelas

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This page is a summary of: Purification of pulp mill condensates by an adsorptive process on activated carbon, Holzforschung, January 2019, De Gruyter,
DOI: 10.1515/hf-2018-0125.
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