High molar mass lignin in bleached kraft pulp mill effluents

Substances of high molar mass (greater than 1000 g per mol) in acid and alkaline kraft pulp bleaching wastewaters were studied using gel permeation chromatography. These substances represented 65-75 per cent of ultraviolet-absorbing components in alkaline effluents, and 20 per cent in acid effluents...

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Bibliographic Details
Published in:Water science and technology 1988-01, Vol.20 (2), p.49-58
Main Authors: Sagfors, P.E, Starck, B
Format: Article
Language:English
Subjects:
Acids
Acute toxicity
Aromatic compounds
Bleaching
bleaching agents
Carbohydrates
chemical analysis
Chlorine
chromatography
Effluents
Freshwater
Freshwater crustaceans
gel permeation chromatography
Gels
Industrial wastewater
Infrared spectroscopy
Kraft pulp
Lignin
Liquid chromatography
Mass
Mortality causes
Oxygen content
Pulp
Pulp & paper mills
pulp and paper mill effluents
Pulp mill effluents
Pulp wastes
Pulping
Salts
Softwoods
Spectra
Toxicity
Toxicity tests
Ultraviolet radiation
wastewater
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Summary:Substances of high molar mass (greater than 1000 g per mol) in acid and alkaline kraft pulp bleaching wastewaters were studied using gel permeation chromatography. These substances represented 65-75 per cent of ultraviolet-absorbing components in alkaline effluents, and 20 per cent in acid effluents. Lignin was the precursor of these compounds in the alkaline stage, and lignin and carbohydrates were the precursors in the acid stage. The substances from both stages were further characterized by infrared spectroscopy, and their toxicity to Daphnia magna was determined; in general, these compounds were non-toxic.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.1988.0045