Contribution of extractives to methanogenic toxicity of hemp black liquor

Sjon Kortekaas, Manuel Soto, Teresa Vicent, Jim A. Field, Gatze Lettinga

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

The objective of this research was to identify the major sources of methanogenic toxicity in hemp black liquors. Hemp extractives were shown to be highly toxic. The stem wood extractives, which had a 50% inhibitory concentration (IC) corresponding to 0.25 g COD/l, were somewhat more toxic than the bark extractives with a 50% IC corresponding to 0.65 g COD/l. The methanogenic toxicity of black liquors from hemp was comparable with the toxicity of black liquors from woody feedstocks and ranged between 2.8 and 4.8 g COD/l. Removal of extractives from the hemp fiber prior to pulping only partly reduced methanogenic toxicity, in spite of high extractive removal efficiencies. The residual extractives remaining in the feedstocks after fiber extraction (10 to 30% of the extractives according Soxhlet determination) were apparently released into the black liquor during pulping. To improve removal of the extractives, hemp black liquor was subjected to several detoxification treatments. Ethyl ether extraction and Amberlite XAD-2 treatment achieved complete wastewater detoxification. These results indicate that the apolar extractive fraction is the major source of methanogenic toxicity in hemp black liquors. © 1995.
Original languageEnglish
Pages (from-to)383-388
JournalJournal of Fermentation and Bioengineering
Volume80
Issue number4
DOIs
Publication statusPublished - 1 Jan 1995

Keywords

  • black liquor
  • extractives
  • hemp
  • methanogenic toxicity

Fingerprint Dive into the research topics of 'Contribution of extractives to methanogenic toxicity of hemp black liquor'. Together they form a unique fingerprint.

  • Cite this

    Kortekaas, S., Soto, M., Vicent, T., Field, J. A., & Lettinga, G. (1995). Contribution of extractives to methanogenic toxicity of hemp black liquor. Journal of Fermentation and Bioengineering, 80(4), 383-388. https://doi.org/10.1016/0922-338X(95)94208-9