Purification of pulp mill condensates by an adsorptive process on activated carbon
authors Gamelas, JAF; Rebola, SM; Evtyugina, MG; Esteves, VI; Evtuguin, DV
nationality International
journal HOLZFORSCHUNG
author keywords activated carbon; adsorption kinetics; aromatics; black liquor; evaporation condensate; organosulfur compounds
keywords SULFUR-COMPOUNDS; METHYL MERCAPTAN; REMOVAL; AIR; SURFACE; DIESEL; WATER
abstract In order to close the water cycle in pulp mills with condensates instead of fresh water, the malodorous/hazardous volatile compounds and colored substances have to be removed by appropriate efficient methods. In the present work, the condensate from the evaporation of black liquor (BL) from a kraft mill was purified by a batch adsorptive process by means of commercial activated carbon (AC). The effluent was found to contain a wide range of aromatic and organosulfur volatile compounds, including toluene, ethylguaicol, syringaldehyde, dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), 2,3-dimethylthiophene, benzothiol and benzothiophene derivatives. Methanol was the major volatile organic component in the condensate (201 mg l(-1)), which was, however, poorly adsorbed on the AC surface. Aromatics and organosulfur contaminants were adsorbed almost completely in 2-5 min at 23 degrees C under the optimized AC load (900 mg l(-1)). The treatment allowed the elimination of up to 99% of the obnoxious odor, color and turbidity of the condensate. The adsorption equilibrium followed the Langmuir model and the pseudo-second-order kinetics. The new process could be incorporated in the pulp mill with relatively low additional reagent costs.
publisher WALTER DE GRUYTER GMBH
issn 0018-3830
year published 2019
volume 73
issue 6
beginning page 589
ending page 597
digital object identifier (doi) 10.1515/hf-2018-0125
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:000469357200008
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journal impact factor 2.079
5 year journal impact factor 1.807
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