A new perspective (sorption/desorption) on the question of chlorolignin degradation to chlorinated phenolics

A "monomer-free" (i.e., predominantly high molecular weight chlorolignin) solution prepared from spent liquor collected from the alkali extraction stage of a softwood kraft pulp mill bleach plant was examined for its ability to release monomeric chlorinated phenolic compounds when stored u...

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Bibliographic Details
Published in:Environmental science & technology 1992-03, Vol.26 (3), p.556-560
Main Authors: O'Connor, Brian I, Voss, Ronald H
Format: Article
Language:English
Subjects:
Applied sciences
Chlorine
Engineering
Engineering, Environmental
Environmental Sciences
Environmental Sciences & Ecology
Exact sciences and technology
Life Sciences & Biomedicine
Other industrial wastes. Sewage sludge
Pollution
Pulp & paper mills
Science & Technology
Technology
Wastes
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Summary:A "monomer-free" (i.e., predominantly high molecular weight chlorolignin) solution prepared from spent liquor collected from the alkali extraction stage of a softwood kraft pulp mill bleach plant was examined for its ability to release monomeric chlorinated phenolic compounds when stored under sterile conditions at pH 7. The major chlorinated phenolics released from the chlorolignin solution, after 28 days of storage at 50-degrees-C, were 4,5-dichloroguaiacol, 3,4,5-trichloroguaiacol, 6-chlorovanillin, and 5,6-dichlorovanillin. These four compounds were found to reach maximum concentrations over the storage period, which corresponded to only 2.3-3.6% of their concentrations in the original E-stage effluent. The remaining chlorinated phenolics normally present in spent bleach liquors did not reach concentrations of > 1-mu-g/L over the course of the experiment. A spiking experiment using C-13-labeled 4,5-dichloroguaiacol demonstrated that the chlorinated phenolics which are released from the chlorolignin over time may be the result of the slow desorption of chlorinated phenolics which had become associated with the chlorolignin during the bleaching process and not necessarily due to chlorolignin degradation as previously hypothesized.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00027a018