Oxidative detoxification of aqueous bark extracts. Part II: Alternative methods

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Abstract

The most important problem associated with the high-pH autoxidative detoxification of methanogenic toxins in debarking wastewater was its limited application to the aqueous extractives of bark from specific species. The autoxidative polymerization of coniferous bark extracts exhausted prior to complete removal of the toxic oligomeric tannins. As a result, highly toxic spruce bark extracts were only partly detoxified. Birch bark extracts were not detoxified, even though effective polymerization of the oligomeric tannins occurred. The nontannin toxins in birch bark extracts and toxic intermediates produced by high-pH autoxidation of these extracts were responsible for the poor detoxification results. These problems can potentially be resolved by applying alternative oxidation methods. In this study a high level of detoxification was obtained for all bark species tested by short-term destructive oxidations with H2O2, or by long-term aerobic biological treatments which caused high levels of polymerization. The applicability of high-pH autoxidation was also made feasible for all species of bark by applying a granular active carbon treatment after the autoxidation. The active carbon was able to adsorb the residual toxic oligomeric tannins of autoxidized spruce bark extracts and the non-tannin toxins in autoxidized birch bark extracts.

Original languageEnglish (US)
Pages (from-to)35-53
Number of pages19
JournalJournal of Chemical Technology and Biotechnology
Volume49
Issue number1
StatePublished - 1990
Externally publishedYes

Fingerprint

Tannins
Detoxification
Poisons
detoxification
Betula
bark
Polymerization
Oxidation
Carbon
tannin
polymerization
toxin
Wastewater
Waste Water
method
oxidation
carbon
wastewater

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Biotechnology
  • Bioengineering

Cite this

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title = "Oxidative detoxification of aqueous bark extracts. Part II: Alternative methods",
abstract = "The most important problem associated with the high-pH autoxidative detoxification of methanogenic toxins in debarking wastewater was its limited application to the aqueous extractives of bark from specific species. The autoxidative polymerization of coniferous bark extracts exhausted prior to complete removal of the toxic oligomeric tannins. As a result, highly toxic spruce bark extracts were only partly detoxified. Birch bark extracts were not detoxified, even though effective polymerization of the oligomeric tannins occurred. The nontannin toxins in birch bark extracts and toxic intermediates produced by high-pH autoxidation of these extracts were responsible for the poor detoxification results. These problems can potentially be resolved by applying alternative oxidation methods. In this study a high level of detoxification was obtained for all bark species tested by short-term destructive oxidations with H2O2, or by long-term aerobic biological treatments which caused high levels of polymerization. The applicability of high-pH autoxidation was also made feasible for all species of bark by applying a granular active carbon treatment after the autoxidation. The active carbon was able to adsorb the residual toxic oligomeric tannins of autoxidized spruce bark extracts and the non-tannin toxins in autoxidized birch bark extracts.",
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T1 - Oxidative detoxification of aqueous bark extracts. Part II

T2 - Alternative methods

AU - Field, James A

AU - Sierra Alvarez, Maria Reye

AU - Lettinga, G.

PY - 1990

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N2 - The most important problem associated with the high-pH autoxidative detoxification of methanogenic toxins in debarking wastewater was its limited application to the aqueous extractives of bark from specific species. The autoxidative polymerization of coniferous bark extracts exhausted prior to complete removal of the toxic oligomeric tannins. As a result, highly toxic spruce bark extracts were only partly detoxified. Birch bark extracts were not detoxified, even though effective polymerization of the oligomeric tannins occurred. The nontannin toxins in birch bark extracts and toxic intermediates produced by high-pH autoxidation of these extracts were responsible for the poor detoxification results. These problems can potentially be resolved by applying alternative oxidation methods. In this study a high level of detoxification was obtained for all bark species tested by short-term destructive oxidations with H2O2, or by long-term aerobic biological treatments which caused high levels of polymerization. The applicability of high-pH autoxidation was also made feasible for all species of bark by applying a granular active carbon treatment after the autoxidation. The active carbon was able to adsorb the residual toxic oligomeric tannins of autoxidized spruce bark extracts and the non-tannin toxins in autoxidized birch bark extracts.

AB - The most important problem associated with the high-pH autoxidative detoxification of methanogenic toxins in debarking wastewater was its limited application to the aqueous extractives of bark from specific species. The autoxidative polymerization of coniferous bark extracts exhausted prior to complete removal of the toxic oligomeric tannins. As a result, highly toxic spruce bark extracts were only partly detoxified. Birch bark extracts were not detoxified, even though effective polymerization of the oligomeric tannins occurred. The nontannin toxins in birch bark extracts and toxic intermediates produced by high-pH autoxidation of these extracts were responsible for the poor detoxification results. These problems can potentially be resolved by applying alternative oxidation methods. In this study a high level of detoxification was obtained for all bark species tested by short-term destructive oxidations with H2O2, or by long-term aerobic biological treatments which caused high levels of polymerization. The applicability of high-pH autoxidation was also made feasible for all species of bark by applying a granular active carbon treatment after the autoxidation. The active carbon was able to adsorb the residual toxic oligomeric tannins of autoxidized spruce bark extracts and the non-tannin toxins in autoxidized birch bark extracts.

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